Search

A wafer-scale process for fabricating monolithically suspended nano-perforated membranes (NPMs) with integrated support structures into silicon is developed. Existing fabrication methods are suitable for many desired geometries, but face challenges related to mechanical robustness and fabrication complexity. We demonstrate a process that utilizes the cyclic deposit, remove, etch, and multi-step (DREM) process for directional etching of high-aspect-ratio (HAR) 300 nm in diameter nano-pores of 700 nm pitch. Subsequently, a buried cavity beneath the nano-pores is formed by switching to an isotropic etch, which effectively yields a thick NPM. Due to this architecture's flexibility and process robustness, structural parameters such as membrane thickness, diameter, integrated support structures, and cavity height can be adjusted, allowing a wide range of NPM geometries. This work presents NPMs with final thicknesses of 4.5 µm, 6.5 µm, and 12 µm. Detailed steps of this new approach are discussed, including the etching of a through-silicon-via to establish the connection of the NPM to the macro-world. Our approach to fabricating NPMs within single-crystal silicon overcomes some of the limitations of previous methods. Owing to its monolithic design, this NPM architecture permits further enhancements through material deposition, pore size reduction, and surface functionalization, broadening its application potential for corrosive environments, purification and separation processes, and numerous other advanced applications. [ABSTRACT FROM AUTHOR]

ABSTRACT Objective Methods Results Conclusion To assess the clinical, radiographic and patient‐reported outcome measures, and the success of screw‐retained one‐piece monolithic zirconia implant‐supported restorations in the posterior region during a 1‐year follow‐up.In a prospective case series, 50 single molar sites in the posterior region of 41 patients with a minimum age of 18 years and sufficient bone volume for placing an implant (≥ 8 mm) and space for an anatomical restoration were included. Following prosthetic‐driven digital three‐dimensional treatment planning, a tissue‐level implant with an internal connection was inserted during a one‐stage surgical procedure. Three months later, the implant was restored with a screw‐retained one‐piece monolithic zirconia restoration. Clinical, radiographic and patient‐reported outcome measures, and restoration survival and success according to the modified USPHS criteria were assessed at baseline prior to and immediately after implant placement, and 1‐month and 1‐year after definitive restoration placement.At the 1‐year follow‐up, 1 implant had been lost (implant survival rate 98%) hence, 49 restorations were evaluated. The restoration survival and success rates were 100% and 98%, respectively. Plaque, calculus, bleeding and suppuration on probing and peri‐implant inflammation were absent in most cases. The mean (SD) marginal bone level change between implant placement and the 1‐year follow‐up was −0.14 mm (0.27) on the mesial and −0.25 mm (0.31) on the distal side. The mean (SD) patient satisfaction (0–10) was 9.2 (0.8) at the 1‐year evaluation.One‐piece monolithic zirconia implant‐supported restorations exhibited favourable outcomes over 1 year in situ.Trial Registration: Registered in the National Trial Register (NL9059) [ABSTRACT FROM AUTHOR]

This study presents an experimental investigation into the industrial foundation piles. The research carried out employed both destructive and non-destructive testing methods to evaluate the concrete compressive strength and flexural strength capacity of the piles under monotonic loading. The Destructive Test (DT) involves a 28-day cylinder concrete compressive test, while the Non-Destructive Test (NDT) utilizes the Ultrasonic Pulse Velocity (UPV) and Rebound Hammer (RH) tests. The flexural strength test is conducted using a loading frame, and the results are compared to the GeoPIV-RG, which measures the displacement during the test. The experimental investigations provide insights into the behavior of pile joints when subjected to monotonic load in soft and loose soil. The results indicate a significant difference between the compressive strength obtained from the DT and NDT, with a ratio of 0.64-0.74. Furthermore, the failure occurred at the joints, rather than the welded area, with the ratio of the initial stiffness of the piles with joints to the monolithic pile being 0.15 for zig-zag welded and 0.30 for circular welded, and reaching an average value of 0.225. According to the GeoPIV-RG result, the displacement is similar to the flexural strength test result. [ABSTRACT FROM AUTHOR]

Glass fiber–reinforced polymer (GFRP) reinforcements can be used as shear friction connectors at the interface of concrete composite elements to maintain structural integrity. However, the shear friction mechanism at the interface greatly depends on the interface condition and the stiffness of the reinforcement crossing the interface plane. A total of 18 GFRP-reinforced concrete (RC) push-off specimens were constructed and tested until failure under monotonic load. The test parameters included the shear plane condition (roughened or not roughened, cold joints and monolithic), type (steel and GFRP), and ratio (0.24%–0.47%) of reinforcement crossing the shear plane. Roughening the interface had a little effect on the overall behavior and shear capacity of the specimen. Conversely, the monolithic specimens carried approximately 60% higher load than their cold-joint counterparts; nevertheless, the failure was more brittle. The capacity prediction by the Canadian Highway Bridge Design Code showed conservative results. By contrast, the predictions of the American Concrete Institute's model for steel-RC elements overestimated the test results for cold-joint and monolithic specimens with reinforcement ratios of 0.43% or higher. [ABSTRACT FROM AUTHOR]

The transition from polylithic (composed of many parts) to monolithic (one part) design in automotive components presents an opportunity for a reduction in part count, weight, processing routes, and production time without compromising performance. The traditional design approaches for rooftop tents assemble various sheet metal and extrusions together using different joining processes such as welding, adhesive bonding, bolting, and riveting. This is often associated with disadvantages, such as increased weight, high production time, and leaking joints. This research, therefore, presents the development of a monolithic, lightweight, stiffened, non-rotational automotive rooftop tent that is manufactured via the deep-drawing process. An onsite company case study was conducted to analyze the polylithic product and its production process to determine its limitations. This was followed by the design of a lightweight, non-rotational monolithic product whose purpose is to eliminate the identified disadvantages. The stiffness geometries were developed to enhance the overall structural integrity without adding unnecessary weight. The Analytic Hierarchy Process (AHP) was used to analyze and evaluate alternative layouts against criteria such as complexity, tool design, symmetry, rigidity, and cost. Simulations conducted using NX 2024 software confirmed the effectiveness of this design. The results show that the monolithic rooftop tent has a comparable stiffness performance between the lightweight, monolithic rooftop tent and the heavy, polylithic rooftop tent. At the same time, the part count was reduced from twenty-three (23) single parts (polylithic) to a one (1) part (monolithic) rooftop tent, the weight was reduced by 15.6 kg, which translates to a 30% weight reduction without compromising the performance, processing routes were reduced from eight (8) to three (3), production time was reduced by 120 min, and leaking was eliminated. It can, therefore, be concluded that the design and manufacturing of monolithic rooftop tents leads to a lighter and stronger product. [ABSTRACT FROM AUTHOR]

Red InGaN has attracted much attention recently for micro‐light‐emitting diode (microLED) display applications. However, the consequences of spectral broadening are often overlooked and many of the published spectra do not meet display gamut requirements. Herein, maximizing the red InGaN radiance with a spectrum capable of meeting the digital cinema initiatives‐protocol 3 standard (dominant wavelength of ≈615 nm) is focused on. The maximum radiance for LEDs meeting said requirement is obtained at 20 A cm−2 and corresponds to 4% wall‐plug efficiency (WPE) in large‐area encapsulated devices. The WPE can be increased to 12.5% using epitaxy of lower In concentration driven at 2 A cm−2. Also, data for microLEDs fabricated from similar red InGaN epitaxy are reported. No size dependence of the internal quantum efficiency or spectra is observed down to the smallest sizes studied (≈2 μm). Herein, expertise with red InGaN and nitride tunnel junctions is further leveraged to demonstrate polychromatic microLEDs with independent control of red, green, and blue emission within single pixels of 9 × 12 μm dimensions. These devices are grown in a single growth run on the same sapphire substrate wafer using methods proven in high‐volume epitaxy manufacturing. [ABSTRACT FROM AUTHOR]

Excellent coating adhesion is a crucial requirement for monolithic catalysts. Within this investigation, a Design of Experiments (DOEs) Taguchi approach was leveraged to construct a 9-factor-3-level matrix encompassing 27 parallel experiments. This framework was employed to scrutinize the pivotal elements influencing the adhesion of FeCrAl metal-based integral coatings, which were prepared using the slurry method. Moreover, an unprecedented endeavor was made to scrutinize the mechanism of coating delamination from the vantage points of macroscopic slurry, microscopic coatings, and nanoscale interfaces. The findings reveal the following: (1) The inclusion of a high-acidity additive (>5%) emerges as one of the pivotal factors in achieving superior adhesion, particularly when the boehmite content exceeds 1%. (2) The existence of binder-filled interstices within the coating, smaller by 1–2 orders of magnitude than the carrier particles, significantly contributes to heightened adhesion. (3) A bonding region of approximately 5 nm is present at the interfaces between carrier particles, resulting in augmented adhesion. [ABSTRACT FROM AUTHOR]

Purpose: To evaluate the effect of chewing simulation and thermocyclic aging on the fracture resistance of CAD/CAM monolithic zirconia crowns supported by titanium and Ti-base abutments. Materials and Methods: Two implant abutment groups--titanium (Ti) and titanium base (Ti-base; Medentika)--were used. A total of 40 mandibular first molar CAD/CAM monolithic zirconia crowns (Vita YZ T) were fabricated, then cemented onto the abutments with Panavia V5. Each abutment group was divided into two subgroups (n = 10). The Ti and Ti-base groups were subjected to a single load until fracture, and the Ti/CT and Ti-base/CT groups (CT: chewing simulation and thermocyclic aging) underwent chewing simulation (1.2 × 106 cycles × 50 N load, 1.4 Hz) and thermocylic aging (3,911 cycles/5°C to 55°C). The fracture resistances of the crowns were tested with a universal testing machine (1 mm/minute). Shapiro-Wilk and one-way ANOVA test were used for statistical analysis (P = .05). Results: The survival rates after chewing simulation and thermocyclic aging were 100% for both CT groups. The fracture resistance values (mean ± SD) of the groups were as follows: Ti = 1,718.18 ± 331.06 N, Ti-base = 1,713.53 ± 233.24 N, Ti/CT = 1,664.82 ± 188.62 N, and Ti-base/CT = 1,551.28 ± 344.79 N. According to one-way ANOVA test results, there was no statistically significant difference between the four groups (P = .526). Conclusion: CAD/CAM monolithic zirconia crowns supported by Ti-base or titanium abutments were found to have sufficient fracture resistance in the treatment of an absent single posterior tooth. However, more in vitro and clinical studies are required to evaluate the long-term performance of Ti-base abutments and CAD/CAM zirconia crowns. [ABSTRACT FROM AUTHOR]

The design freedom of Additive Manufacturing offers new opportunities for the design of mounting structures of optical systems, which are not feasible for conventional manufacturing approaches, thus opening up new areas of application for optical systems. We use this to develop a fully monolithic mounting structure for precise positioning of the optical elements, while simultaneously increasing their robustness against harsh environmental conditions. We additively manufacture such a mounting structure for an imaging lens and evaluate its optical performance with interferometric measurement of its wavefront, before and after applying a mechanical shock to the entire system. The results indicate a centering accuracy better than 6 μm, both in the initial positioning as well as the subsequent repositioning after a mechanical shock of 15G. [ABSTRACT FROM AUTHOR]

A wafer-scale process for fabricating monolithically suspended nano-perforated membranes (NPMs) with integrated support structures into silicon is developed. Existing fabrication methods are suitable for many desired geometries, but face challenges related to mechanical robustness and fabrication complexity. We demonstrate a process that utilizes the cyclic deposit, remove, etch, and multi-step (DREM) process for directional etching of high-aspect-ratio (HAR) 300 nm in diameter nano-pores of 700 nm pitch. Subsequently, a buried cavity beneath the nano-pores is formed by switching to an isotropic etch, which effectively yields a thick NPM. Due to this architecture’s flexibility and process robustness, structural parameters such as membrane thickness, diameter, integrated support structures, and cavity height can be adjusted, allowing a wide range of NPM geometries. This work presents NPMs with final thicknesses of 4.5 µm, 6.5 µm, and 12 µm. Detailed steps of this new approach are discussed, including the etching of a through-silicon-via to establish the connection of the NPM to the macro-world. Our approach to fabricating NPMs within single-crystal silicon overcomes some of the limitations of previous methods. Owing to its monolithic design, this NPM architecture permits further enhancements through material deposition, pore size reduction, and surface functionalization, broadening its application potential for corrosive environments, purification and separation processes, and numerous other advanced applications.

We know that use, of Concrete is at construction industry is one of important part and comes at first number due to its compressive test, strength and durability. It has capacity to act as a binding material and high capacity to take strength and some other properties. There are many research were going on respective bond of concrete, fatigue, and creep on active level. Another part is as the times goes the strength of concrete will be reduced and may leads to damage and deteriorate it is one of the drawback of the concrete after we should have the need to repair the concrete to increase a structural strength and make a stiffness property improved which leads to safe structure. Our day by day infrastructure has been developed and have facing some problem for bonding between old to new structure and with composite structure are main issue so we need to repair that and make a proper strength to the corresponding structure. A bond which is good helps the engineer to consider monolithic behavior and it also helps in preventing de-icing salts and water to transmit along the interface. The strength and efficiency of a structure Increases with monolithic behavior of the structure. Main concept is the repair is to be done in such a way that bond will acts a it is originally designed. Making bond strength capable to transfer load and forces such as compression, tension, shear will be properly and safely. In concrete patch repairs application we have seen that the repair material plays a vital importance for concrete on Good Adhesion. For determining the bond strength between material and substrate there are several test. Bond strength under combines shear and compressive stresses, bond strength under shear stresses, under tension stresses respectively are the tests. Combine state of stress that combines compression and shear fall under slant shear tests. . In slant shear test we use a cylindrical or a square prism sample made of two identical parts which are bond at an angle of 30° and under axial compression they are tested. Some experimental work is done in this thesis using concrete steel composite material using epoxy based bonding agent and performing slant shear test and finding out bonding strength and durability of the bond. [ABSTRACT FROM AUTHOR]

We present a method of monolithically integrating GaN microLEDs with an IGZO TFT backplane to produce an activematrix microdisplay. After discussion of the fabrication process, individual LEDs, TFTs, and the integrated system are characterized. Results demonstrate a 32x32 pixel, 78.4 PPI microdisplay with luminance exceeding 1500 nits. This type of monolithic microdisplay forges the path forward for future high luminance integrated displays to enable augmented and mixed reality applications. [ABSTRACT FROM AUTHOR]

Augmented reality smart glasses, in general, have highest requirements as compared with smart phones and watches. Its display must be of light weight (a few grams), tremendous brightness (millions of nits), low power consumption (hundreds of milliwatts), and extremely small volume (a small fraction of cubic centimeter) to allow fashionable smart glass designs that would be socially and aesthetically favored by consumers. We have been focusing on micrometer‐scale native semiconductor MicroLED integration, to create miniaturized panels and projectors, which can be seamlessly integrated into the frames of the smart glasses. Among many technical aspects of microLED displays, two key parameters will be emphasized here. First, a microLED panel must be bright and efficient at the same time, especially for red microLED panel with small pixel pitch, such as 2.5 µm. Second, a microLED technology must enable reasonable reliability at a high energy density of, such as 10 watts per square centimeter. Vertically stacked native semiconductors monolithic integration, quantum dots conversion, perovskites, etc., will be discussed, in a context of facing challenges in materials and device physics and fulfilling the two requirements. In addition, an image quality correction method on the waveguide‐microLED display module will be proposed. [ABSTRACT FROM AUTHOR]

This paper presents a method of monolithically integrating gallium nitride micrometer‐scale light‐emitting diodes (microLEDs) with an indium gallium zinc oxide (IGZO) thin‐film transistor (TFT) backplane to produce an active‐matrix microdisplay. After discussion of the fabrication process, individual LEDs, TFTs, and the integrated system are characterized. Results demonstrate a 32 × 32 pixel, 78.4 PPI microdisplay with luminance exceeding 1500 nits. The dynamic set and hold behaviors of the active‐matrix pixel circuit are analyzed to verify the applicability of this technology for use in high and low refresh rate displays. [ABSTRACT FROM AUTHOR]

A novel monolithic compliant Lorentz-force-driven XY nanopositioning system (MCLNS) is designed, analyzed, and experimentally assessed with the aim of high-resolution positioning across a large workspace. A double-symmetric Lorentz-force actuator (DSLA) with the benefits of zero friction, high thrust, and large stroke is proposed to generate the actuation force. Correspondingly, a monolithic four-prismatic parallel compliant mechanism (4P-PCM) is exploited to transmit the actuation motion to the central platform and minimize the parasitic motion. The unique integration of four DSLAs and one 4P-PCM make the proposed MCLNS possess compact structure and stable performance. The characterization of the MCLNS is formulated by a specially established analytical model and validated by finite-element analysis simulation and experimental tests. Experimental studies show that the workspace of the MCLNS prototype is large than 0.87 × 0.87 mm2 and the positioning resolution of the MCLNS prototype is better than 9 nm. By means of a nonlinear forward proportional integral derivative control strategy, the maximum contouring error of the MCLNS is maintained within 2.7% while tracking a 1257 μ m s−1 circular trajectory. [ABSTRACT FROM AUTHOR]

This article presents a comparative study of different topologies of monolithic on-chip planar transformer, operating at high frequencies and suitable for optical VCSEL driver. The vertical cavity surface emitting laser (VCSEL) driver is presented for optical transceiver systems. At the VCSEL driver output stage, the on-chip transformer is used to compensate for large bandwidth and deliver adequate gain. On-chip transformer equivalent circuit model has been proposed and used for simulation and measurement. The eye pattern results show that the VCSEL driver with an on-chip transformer presents good performance. Different topologies of the on-chip transformer are compared and 0,5 µm CMOS technology measurements are considered in the frequency range from 1 GHz to 10 GHz. Square, hexagonal, octagonal, and circular topologies of on-chip transformer have been compared. The circular topology presents a good performance and high-quality factor. The square shape provides a high inductance value and low quality compared to the other topologies. [ABSTRACT FROM AUTHOR]

Purpose: To compare the fracture resistance and failure modes of anterior cantilever resin‐bonded fixed partial dentures (RBFPDs) fabricated from high translucency zirconia with different intaglio surface treatments. Materials and methods: Sound‐extracted canines (N = 50) were randomly divided into five groups (n = 10) to be restored with high translucency zirconia RBFBDs of different intaglio surface treatments. The RBFPD was designed using exocad software and fabricated using a CAM milling machine. The RBFPDs were treated differently: abrasion with 50 µm alumina particles (Group 1); abrasion with 30 µm silica‐coated alumina particles (Group 2); abrasion with silica‐coated alumina particles (30 µm) and silane application (Group 3); abrasion with silica‐coated alumina particles (30 µm) and 10‐methacryloyloxydecyl dihydrogen phosphate (10‐MDP) primer application (Group 4); abrasion with silica‐coated alumina particles (30 µm) and silane, and 10‐MDP primer application. All RBFPDs were cemented using dual‐cured resin cement. The RBFPDs underwent 6000 thermal cycles with distilled water at 5/55°C for 2 min per cycle and then mechanical cyclic loading with 1200,000 cycles of 50 N at a 1.7 Hz frequency at an angle of 135° to the abutment's long axis. Then, RBFPDs were loaded to fracture using a universal testing machine at 1 mm/min. Maximum fracture forces and failure modes were recorded. Fractured specimens and uncemented specimens were examined using a scanning electron microscope. Data was analyzed using ANOVA and Games–Howell post hoc tests at p < 0.05. Results: Mean fracture load results showed a statistically significant difference between the research groups (p < 0.0001) and it ranged from 69.78 to 584 N. Group 4 exhibited the highest fracture load mean (p < 0.0001) which was significantly different from all other groups. Group 2 recorded a significantly higher fracture load mean than Group 3 (p = 0.029). Three modes of failure were observed: prosthesis debonding, prosthesis fracture, and abutment fracture. Conclusions: Abrasion of zirconia surface with 30 µm silica‐coated alumina particles and application of 10‐MDP primer yielded the highest mean fracture loads of monolithic high translucency zirconia RBFPD. The mode of fracture of the RBFPDs was influenced by the type of surface treatments. [ABSTRACT FROM AUTHOR]

This article presents a multiobjective thermal controller that stabilizes the resonance wavelength of silicon photonic microring modulators (MRMs) under varying temperature conditions and fluctuations in laser power. The controller operates in the background while live data is flowing, adjusting the MRM resonance wavelength to achieve optimal application-specific performance metrics, including any one of extinction ratio (ER), optical modulation amplitude (OMA), or level separation mismatch ratio (RLM). This universal bias-assisted photocurrent-based controller is capable of selectively tuning for any of these transmitter metrics without the need for broadband circuits. Notably, this is the first controller proposed to tune the MRM for optimizing RLM, which is particularly important as MRMs are now increasingly adopted for 4-PAM modulation. The controller functionality is verified on an MRM monolithically integrated in a silicon photonic 45-nm CMOS SOI process with a high-swing $4.7~{V}_{\text {pp}}$ digital-to-analog converter (DAC)-based 5.5-bit resolution driver, dissipating $1.7~\text {pJ/b}$ at $40~\text {Gb/s}$ . With the controller optimizing for different objectives, an ER of 10.3 dB, OMA of $540~\mu \text {W}$ (normallized OMA of −3.2 dB), transmitter dispersion eye closure quaternary (TDECQ) of 0.67 dB, and RLM of 0.96 are achieved without employing a nonlinear feed-forward equalizer (FFE) or predistortion.

The transition from polylithic (composed of many parts) to monolithic (one part) design in automotive components presents an opportunity for a reduction in part count, weight, processing routes, and production time without compromising performance. The traditional design approaches for rooftop tents assemble various sheet metal and extrusions together using different joining processes such as welding, adhesive bonding, bolting, and riveting. This is often associated with disadvantages, such as increased weight, high production time, and leaking joints. This research, therefore, presents the development of a monolithic, lightweight, stiffened, non-rotational automotive rooftop tent that is manufactured via the deep-drawing process. An onsite company case study was conducted to analyze the polylithic product and its production process to determine its limitations. This was followed by the design of a lightweight, non-rotational monolithic product whose purpose is to eliminate the identified disadvantages. The stiffness geometries were developed to enhance the overall structural integrity without adding unnecessary weight. The Analytic Hierarchy Process (AHP) was used to analyze and evaluate alternative layouts against criteria such as complexity, tool design, symmetry, rigidity, and cost. Simulations conducted using NX 2024 software confirmed the effectiveness of this design. The results show that the monolithic rooftop tent has a comparable stiffness performance between the lightweight, monolithic rooftop tent and the heavy, polylithic rooftop tent. At the same time, the part count was reduced from twenty-three (23) single parts (polylithic) to a one (1) part (monolithic) rooftop tent, the weight was reduced by 15.6 kg, which translates to a 30% weight reduction without compromising the performance, processing routes were reduced from eight (8) to three (3), production time was reduced by 120 min, and leaking was eliminated. It can, therefore, be concluded that the design and manufacturing of monolithic rooftop tents leads to a lighter and stronger product.

Abstract Background Although a new generation of tomographs with a longer axial field-of-view called total-body PET have been developed, they are not widely utilized due to their high cost compared to conventional scanners. The newly designed walk-through total-body PET scanner is introduced as a high-throughput and cost-efficient alternative to total-body PET scanners, by making use of a flat panel geometry and lower cost, depth-of-interaction capable, monolithic BGO detectors. The main aim of the presented study is to evaluate through Monte Carlo simulation the system characteristics of the walk-through total-body PET scanner by comparing it with a Quadra-like total-body PET of similar attributes to the Siemens Biograph Vision Quadra. Methods The walk-through total-body PET is comprised of two flat detector panels, spaced 50 cm apart. Each panel, 70 $$\times$$ × 106 cm $$^2$$ 2 in size, consists of 280 BGO-based monolithic detectors. The Quadra-like TB-PET has been simulated based on the characteristics of the Biograph Vision Quadra, one of the most common total-body PET scanners with 106 cm of axial field-of-view, which is constructed with pixelated LSO scintillation crystals. The spatial resolution, sensitivity, count rate performance, scatter fractions, and image quality of both scanners are simulated in the GATE simulation toolkit for comparison. Results Due to the DOI-capable detectors used in the walk-through total-body PET, the values of the spatial resolution of this scanner were all below 2 mm along directions parallel to the panels, and reached a maximum of 3.36 mm in the direction perpendicular to the panels. This resolution is a large improvement compared to the values of the Quadra-like TB-PET. The walk-through total-body PET uses its maximum sensitivity (154 cps/kBq) for data acquisition and image reconstruction. Conclusion Based on the combination of very good spatial resolution and high sensitivity of the walk-through total-body PET, along with a 2.2 times lower scintillation crystal volume and 1.8 times lower SiPM surface, this scanner can be a very cost-efficient alternative for total-body PET scanners in cases where concomitant CT is not required.

Background. This study evaluated the influence of different tooth preparation techniques and zirconia materials on marginal adaptation. Methods. Forty-eight healthy human maxillary first premolars were divided into two primary groups based on preparation design: group A (chamfer) and group B (vertical). Within each main group, there were three subgroups, comprising eight teeth each, distinguished by the type of zirconia material employed (Zircad LT, MT, and Prime by Ivoclar Vivadent). All the samples were prepared by the same operator using a dental surveyor. Intraoral scanning was performed on the prepared teeth. SironaInLab CAD 20.0 software was used to design crowns, which were subsequently generated using a 5-axis milling machine. The crowns were cemented to their respective teeth with self-adhesive resin cement. Marginal gap measurements were taken in micrometers (μm) before and after cementation at 16 sites per sample using a digital microscope at×230 magnification. The collected data were evaluated using statistical analysis using the independent t-test, paired t-test, and ANOVA at an 0.05 significance level. Results. The vertical preparation group exhibited the smallest marginal gap, while the chamfer group displayed the largest. This disparity was statistically significant (P

In this manuscript, a robust and variationally consistent technique is proposed for local treatment of the phase-field fracture irreversibility. This technique involves an extension of the phase-field fracture energy functional through a micromorphic approach. Consequently, the phase-field is transformed into a local variable, while a micromorphic variable regularizes the problem. The local nature of the phase-field variable enables an easier implementation of its irreversibility using a pointwise 'max' with system level precision. Unlike the popular history variable approach, which also enforces local fracture irreversibility, the micromorphic approach yields a variationally consistent framework. The efficacy of the micromorphic approach in phase-field fracture modelling is demonstrated in this work with numerical experiments on benchmark brittle and quasi-brittle fracture problems in linear elastic media. Furthermore, the extensibility of the micromorphic phase-field fracture model towards multiphysics problems is demonstrated. To that end, a theoretical extension is carried out for modelling hydraulic fracture, and relevant numerical experiments exhibiting crack merging are presented. The source code as well as the data set accompanying this work would be made available on GitHub (https://github.com/ritukeshbharali/falcon). [ABSTRACT FROM AUTHOR]

Purpose: To assess the clinical performance of screw‐retained, ceramic‐veneered, monolithic zirconia partial implant‐supported fixed dental prostheses (ISFDP) over 5–10 years and to evaluate implant‐ and prosthesis‐related factors influencing treatment failure and complications. Materials and methods: Partially edentulous patients treated with screw‐retained all‐ceramic ISFDPs with 2–4 prosthetic units with a documented follow‐up of ≥5 years after implant loading were included in this retrospective study. The outcomes analyzed included implant/prosthesis failure and biological/technical complications. Possible risk factors were identified using the mixed effects Cox regression analysis. Results: A screened sample of 171 participants with 208 prostheses (95% of the restorations were splinted crowns without a pontic) supported by 451 dental implants were enrolled in this study. The mean follow‐up duration after prosthesis delivery was 82.4 ±17.2 months. By the end of the follow‐up period, 431 (95.57%) of the 451 implants remained functional at the implant level. At the prosthesis level, 185 (88.94%) of the 208 partial ISFDPs remained functional. Biological complications were observed in 67 implants (14.86%), and technical complications were observed in 62 ISFDPs (29.81%). Analysis revealed only emergence profiles (over‐contoured) as a significant risk factor for implant failure (P<0.001) and biological complications (P<0.001). Full‐coverage ceramic‐veneered zirconia prostheses had a significantly greater chance of chipping (P<0.001) compared with buccal‐ceramic‐veneered or monolithic zirconia prostheses. Conclusions: Screw‐retained ceramic‐veneered, monolithic partial ISFDPs have a favorable long‐term survival rate. Over‐contoured emergence profile is a significant risk factor associated with implant failure and biological complications. Buccal‐ceramic‐veneered and monolithic zirconia partial ISFDPs lower the initial prevalence of chipping compared with a full‐coverage veneered design. [ABSTRACT FROM AUTHOR]

Purpose: To assess the impact of abutment angulation on loosening torque, torque loss, and percentage of torque loss in the prosthesis and abutment screws after aging of the implant-supported prosthesis. Materials and Methods: Fifty epoxy maxillary casts with missing central, lateral, and canine teeth were used, and each cast received two implants. All casts were divided into five groups (n = 10): (1) both implants received straight abutments (0-0); (2) the central implant received a straight abutment and the canine implant received a 17.5-degree angled abutment (0-17.5); (3) the central implant received a straight abutment and the canine implant received a 35-degree angled abutment (0-35); (4) both implants received 17.5-degree angled abutments (17.5-17.5); and (5) both implants received 35-degree angled abutments (35-35). For each cast, a three-unit zirconia restoration was fabricated, and a torque meter was utilized to tighten the abutment screw (25 Ncm) and prosthesis screw (18 Ncm). The reverse torque value was recorded for each screw. All restorations were subjected to 3,500 thermal cycles between 5°C and 55°C and load cycled for 150,000 cycles with 50-N load. After the loosening torque was measured for each screw, the torque loss and percentage of torque loss were calculated. Results: There was a statistically significant difference in the torque loss of the central prosthesis screw (P < .001) and canine prosthesis screw (P < .001) between study groups. The 35-35 group showed the highest percentage of torque loss, while the 0-0 group showed the lowest value. A significant difference was found regarding the torque loss of the central abutment screw (P < .001) and canine abutment screw (P < .001). The abutment screws of the 35-35 group showed the highest percentage of torque loss, while the 0-0 groups showed the lowest percentage of torque loss. Conclusion: Screw loosening of the prosthesis and abutment screws increases with increasing abutment angulation after aging. In the same fixed prosthesis, the torque loss in the prosthesis and abutment screws was higher in canine screws employing different angled abutments. [ABSTRACT FROM AUTHOR]

Increasing anthropogenic carbon dioxide emissions have prompted the search for photoelectrochemical (PEC) methods of converting CO2 to useful commodity products, including fuels. Ideally, such PEC approaches will be sustained using only sunlight, water, and CO2 as energetic and reactant inputs. However, low peak conversion efficiencies (

The current study compares the performance of beam-to-beam connections made of monolithic and precast beams under bending loadings. Two different precast beam-beam connections and monolithic beams were subjected to bending load tests using 1/4-scale models of each. The precast beam-beam connections are joined together by steel-welded pipe joints and Poly Vinyl Chloride-pipe joints. The bending load was applied at lengths of 1/3 and 1/4 from the support. The experimental outcomes of the bending test conducted on precast beams and the monolithic beams using universal testing machine were contrasted. The test results provide an evaluation of the flexural strength, failure mechanism, and deformation parameters of precast monolithic and precast connected beams. The results of this investigation shows that steel welded connector beams have equivalent flexural strength and 10.3% less deflection than monolithic beams. Finally, it was concluded that the steel welded pipe-connected beams are superior to monolithic reinforced concrete beams and could be used to connect the precast concrete beam members. The computational finite element method was used to compare the deflection and flexural strength measured from testing on real-scale beams. [ABSTRACT FROM AUTHOR]

Background: Although a new generation of tomographs with a longer axial field-of-view called total-body PET have been developed, they are not widely utilized due to their high cost compared to conventional scanners. The newly designed walk-through total-body PET scanner is introduced as a high-throughput and cost-efficient alternative to total-body PET scanners, by making use of a flat panel geometry and lower cost, depth-of-interaction capable, monolithic BGO detectors. The main aim of the presented study is to evaluate through Monte Carlo simulation the system characteristics of the walk-through total-body PET scanner by comparing it with a Quadra-like total-body PET of similar attributes to the Siemens Biograph Vision Quadra. Methods: The walk-through total-body PET is comprised of two flat detector panels, spaced 50 cm apart. Each panel, 70 × 106 cm 2 in size, consists of 280 BGO-based monolithic detectors. The Quadra-like TB-PET has been simulated based on the characteristics of the Biograph Vision Quadra, one of the most common total-body PET scanners with 106 cm of axial field-of-view, which is constructed with pixelated LSO scintillation crystals. The spatial resolution, sensitivity, count rate performance, scatter fractions, and image quality of both scanners are simulated in the GATE simulation toolkit for comparison. Results: Due to th capable detectors used in the walk-through total-body PET, the values of the spatial resolution of this scanner were all below 2 mm along directions parallel to the panels, and reached a maximum of 3.36 mm in the direction perpendicular to the panels. This resolution is a large improvement compared to the values of the Quadra-like TB-PET. The walk-through total-body PET uses its maximum sensitivity (154 cps/kBq) for data acquisition and image reconstruction. Conclusion: Based on the combination of very good spatial resolution and high sensitivity of the walk-through total-body PET, along with a 2.2 times lower scintillation crystal volume and 1.8 times lower SiPM surface, this scanner can be a very cost-efficient alternative for total-body PET scanners in cases where concomitant CT is not required. [ABSTRACT FROM AUTHOR]

The evolution of materials science, bonding protocols, and innovative manufacturing techniques is driving the development of new ceramic materials, addressing the growing demand for fixed prosthodontics restorations that are both aesthetically pleasing and clinically superior. The recently launched ALD ceramic, designed for the CEREC system, stands out in this regard, offering restorations with enhanced aesthetic and flexural strength. In a detailed case report highlighting the restoration of an anterior tooth, the application of CERECOmnicam for tooth preparation, scanning, and design, coupled with subsequent MCXL fabrication using ALD blocks, yielded an aesthetically pleasing and functionally robust result. Notably, this approach contributed to a more efficient overall treatment time, leading to increased satisfaction for both the patient and the practitioner. This case exemplifies the impactful synergy of advanced materials and chairside technologies in meeting the contemporary demands of fixed prosthodontics. [ABSTRACT FROM AUTHOR]

Objectives: To compare the survival and complication rates of posterior screw‐retained monolithic lithium disilicate (LS2)/veneered zirconia (ZrO2) single implant crowns (SICs), as well as analyze the occlusal changes observed during a 3‐year follow‐up period. Materials and Methods: Thirty‐three patients were included and randomly divided into two groups. The test group consisted of 17 patients who received monolithic‐LS2–SIC, while the control group consisted of 16 patients who received veneered‐ZrO2‐SIC. Implant/prosthesis survival rates, technical complications, peri‐implant soft tissue conditions, and quantitative occlusal changes of SIC (obtained by the intra‐oral scanner and analyzed in reverse software Geomagic Control 2015) were assessed at 1‐ and 3‐year follow‐ups. Bone loss and Functional Implant Prosthodontic Score (FIPS) were evaluated at a 3‐year follow‐up. Results: After a 3‐year follow‐up period, one patient dropped out of the follow‐up. No implant loss was observed. One crown was fractured, resulting in prosthesis survival rates of 93.75% for the monolithic group and 100% for the veneered group. A technical complication rate of 25% (4/16) was observed in the veneered group (p =.333). No significant differences in the marginal bone loss were observed at the 3‐year follow‐up (0.00 (−0.22, 0.17) mm versus 0.00 (−0.12, 0.12) mm, p =.956). The total FIPS scores for the test group were 9.0 (9.0, 9.0), while the control group received scores of 9.0 (8.0, 10.0) (p =.953). The changes in mean occlusal clearance were 0.022 ± 0.083 mm for the test and 0.034 ± 0.077 mm for the control group (at 3 years, p =.497). The changes in occlusal contact area were 1.075 ± 2.575 mm2 for the test and 1.676 ± 2.551 mm2 for the control group (at 3 years, p =.873). Conclusion: After a 3‐year follow‐up, screw‐retained monolithic LS2 and veneered ZrO2 SIC demonstrated similar survival rates. The occlusal performance of implant prostheses needs to be closely examined during follow‐up, and appropriate occlusal adjustments need to be considered. [ABSTRACT FROM AUTHOR]

Purpose: Herein, the bond strength (BS) of denture teeth to a denture base resin in a milled monolithic unit was investigated and compared with those of 3D printed teeth to a 3D printed denture base and prefabricated teeth to a heat-cured acrylic resin before and after thermocycling. Methods: Sixty specimens of a denture tooth attached to a cylindrical denture base were fabricated following ISO Standard 19736. Three fabrication techniques--3D printing, conventional compression molding, and milling using monolithic technology--were employed to mill teeth and denture base parts as a single unit. The BS was investigated before and after thermocycling. Data were statistically analyzed using the Kruskal-Wallis test with Bonferroni correction (a = 0.05). Results: Before thermocycling, the mean BS of the milled group was significantly higher than that of the conventional group (P = 0.002). The 3D printed group showed no statistically significant difference from the milled (P = 0.051) and conventional (P = 0.824) groups. After thermocycling, although the mean BS values of the milled (P = 0.00) and 3D printed (P = 0.01) groups were significantly higher than that of the conventional group, there was no significant difference between them (P = 0.226). Only the BS of the conventional group was significantly reduced by thermocycling (P = 0.00). Conclusions: The milled monolithic fabrication technique, which eliminates the need for a bonding step, offered a promising combination of high-precision digital fabrication and a significantly high BS. The BS of the conventional group significantly decreased after thermocycling. [ABSTRACT FROM AUTHOR]

Purpose: To evaluate the clinical and radiographic outcomes of single‐tooth implant restorations using one‐piece, internally connected, screw‐retained, computer‐aided design and computer‐aided manufactured monolithic zirconia restorations fabricated on regular diameter implants. Material and methods: Following a 2‐stage surgical procedure, 22 implants placed in anterior and posterior areas in 21 partially edentulous patients (mean age of 55 years; 9 males/12 females) were evaluated in terms of plaque index, pocket probing depth, bleeding on probing, level of oral hygiene (OH), signs of mucositis/peri‐implantitis, esthetic score (ES), gingival zenith position (GZP), papilla index score, the thickness of peri‐implant gingiva, radiographic marginal bone loss, and technical complications. Implants and restorations were prospectively followed from the insertion of the restoration (baseline), up to 12‐months post‐loading. Results: A 100% implant survival rate resulted after loading; one implant was lost before loading. Clinically, patients performed an adequate OH, and tissues were kept healthy. Probing depth showed a slightly lower value at baseline compared to any follow‐up examination (2.26 [0.94] at baseline vs. 2.53 [0.66] mm at 12 months). ES, GZP, and the thickness of the peri‐implant gingiva improved throughout the course of the study. Radiographically, average marginal bone level (MBL) was 0.40 (0.40) mm after 1‐year follow‐up with no differences in average MBL at all time points. Technically, after 1 year of clinical function, neither abutment fracture nor any other serious complications occurred. Hence, prosthetic reconstruction survival rate was 100%. Conclusions: Clinical outcomes of single‐tooth implant restorations using internally connected, screw‐retained, computer‐aided design and computer‐aided manufacturing monolithic zirconia abutments can be considered a reliable treatment alternative after 1‐year clinical observation. [ABSTRACT FROM AUTHOR]

Background.: This study evaluated the influence of different tooth preparation techniques and zirconia materials on marginal adaptation. Methods.: Forty-eight healthy human maxillary first premolars were divided into two primary groups based on preparation design: group A (chamfer) and group B (vertical). Within each main group, there were three subgroups, comprising eight teeth each, distinguished by the type of zirconia material employed (Zircad LT, MT, and Prime by Ivoclar Vivadent). All the samples were prepared by the same operator using a dental surveyor. Intraoral scanning was performed on the prepared teeth. SironaInLab CAD 20.0 software was used to design crowns, which were subsequently generated using a 5-axis milling machine. The crowns were cemented to their respective teeth with self-adhesive resin cement. Marginal gap measurements were taken in micrometers (μm) before and after cementation at 16 sites per sample using a digital microscope at×230 magnification. The collected data were evaluated using statistical analysis using the independent t-test, paired t-test, and ANOVA at an 0.05 significance level. Results.: The vertical preparation group exhibited the smallest marginal gap, while the chamfer group displayed the largest. This disparity was statistically significant (P <0.05)> Conclusion.: The vertical preparation design illustrated significantly better marginal adaptation than the chamfer preparation design. Comparisons between materials showed comparable marginal gaps. The mean values of the marginal gaps in all groups increased significantly after cementation. [ABSTRACT FROM AUTHOR]

The aim of this study was to evaluate and compare the fracture resistance of definitive zirconia dioxide restorations obtained using a computer-aided design and manufacturing (CAD/CAM) system. Methods: Two groups of ten samples were analyzed for each material (n: 20); the first group was Zolid Gen X Amann Girrbach (ZGX) and the second group was Cercon HT Dentsply Sirona (CDS). The restorations were designed with identical parameters and milled with a CAD/CAM system. Each specimen was load tested at a speed of 0.5 mm/min, with a direction parallel to the major axis of the tooth and with an initial preload of 10 N until fracture using a universal testing machine (Universal/Tensile Testing Machine, Autograph AGS-X Series) equipped with a 20 kN load cell. The results obtained were recorded in Newtons (N), using software connected to the testing machine. Results: Statistically significant differences were found, and the fracture resistance of the monolithic zirconia crowns was lower in the CDS group (1744.84 ± 172.8 N) compared to the ZGX group (2387.41 ± 516 N). Conclusions: The monolithic zirconia CAD-CAM zirconia crowns showed sufficient fracture resistance when used in posterior molar and premolar zones with either material, as they withstood fracture loads greater than the maximum masticatory force.

Introduction: The marginal fit of any dental restoration is vital to its long-term success. Lack of adequate fit is potentially detrimental to both the tooth and the supporting periodontal tissues. The purpose of this study was to evaluate the marginal fit of monolithic zirconia, monolithic lithium disilicate and monolithic metal crowns and compare the three groups. Methods: The study was conducted by fabricating ten samples for each group, total of 30 samples. A premolar stainless steel die was used to standardize the preparation. PVS putty material was used to make impressions of the model and was poured using type IV die stone. The samples were all fabricated using CAD-CAM. The marginal gap was measured by SEM, and the results were analysed using SPSS software. Results: The mean marginal gap of zirconia, metal and lithium disilicate crowns was 79.49 μm, 46.83 μm and 70.79 μm, respectively. Discussion: The metal group showed the lowest marginal gap among the groups. This difference in marginal fit is due to the sintering process where the organic binders in soft metal burn out and the metallic powder particles are being sintered (caked) without creating a fused phase. Clinical Significance: Marginal fit plays a very important role in the long-term success of a crown. Discrepancy in marginal fit results in food and plaque accumulation causing caries and periodontal breakdown, eventuating the failure of the restoration. A perfect marginal fit would enhance the longevity of any indirect restoration. Knowledge about which indirect restoration has the best marginal fit is critical.

Introduction: Patients’ demand for perfectly esthetic restorations is unstoppably increasing, however creating naturallooking crowns and FPDs is highly affected by the experience of the dental technician even in the present day. This problem is even more complicated if the abutment is discolored (e.g. obturated). Using modern dental ceramic materials, such as zirconia, it’s essential to know the physical (mechanical and optical) properties of the selected material to achieve the best result. Purpose: The purpose of this in vitro study of Semmelweis University Department of Prosthodontics and Budapest University of Technology and Economics Department of Atomic Physics was to examine specific optical properties of coloured and uncoloured monolithic zirconia materials considering thickness, try-in pastes and substrates of different colours using a spectrophotometer. Materials and methods: Zirconia specimens (A2P1, WHITE, Erran Tech) in 5 different thicknesses (with the thickness range of 0.5–2.5 mm), six types of substrate materials (VITA Simulate), three types of metal substrates and three types of try-in pastes (Variolink Esthetic Try-In Paste, Ivoclar Vivadent) were used in this study. Measurements were carried out at Budapest University of Technology and Economics with a PerkinElmer LAMBDA 1050 UV/Vis/NIR spectrophotometer. Colour differences (ΔE) were calculated using CIEDE2000 formula. Results: Mean of ΔE values of 0.5 mm thick A2P1 specimens was xΔE = 4.10 (σΔE = 2.91); that of specimens having thickness of 2.5 mm was xΔE = 1.88 (σΔE = 0.67). Mean of ΔE values of 0.5 mm thick WHITE specimens was xΔE = 6.40 (σΔE = 2.75); that of specimens having thickness of 2.5 mm was xΔE = 5.46 (σΔE = 0.79). Discussion: The substrate colour and the thickness of zirconia affects the optical results – with special regard to colour perceptibility and acceptability – as well as the shade of the try-in paste under 2 mm ceramic thickness. ΔE values of WHITE specimens are less influenced by the thickness of the ceramic layer, than ΔE values of A2P1 zirconia. Conclusions: Coloured (A2P1) and uncoloured (WHITE) zirconia materials show both similarities and discrepancies in behaviour, i.e. spectral reflectance and ΔE. Using monolithic coloured A2P1 zirconia of a proper thickness to restore discolored teeth can provide the opportunity to modify or mask the original toothshade.

Microservices architecture is a new trend embraced by many organizations as a way to modernize their legacy applications. However, although there is work related to the migration process, there is a gap in the body of knowledge related to the principles they should adopt when implementing a microservices architecture. This work presents a comprehensive survey, gathering literature that explores the fundamental principles underlying the object-oriented approach and how these concepts are related to monolithic and microservices architectures. In addition, our research encompasses both monolithic architectures and microservices, along with an investigation into the design patterns and principles utilized within microservices. Our contribution is present a list of patterns used in microservices architecture, the comparation between the principles expounded by the experts in the decomposition of microservices architectures, Martin Fowler and Sam Neuman, and the forerunner of the Principle of Information Hiding, David Parnas, who discusses modularization as a mechanism to improve flexibility and understanding of a system. Additionally, we expose the advantages and disadvantages of monolithic and microservices architectures obtained from the literature review carried out in summary form, which can help as a reference for researchers from academia and industry and finally reveal the trends of microservices architectures today.

Copyright of Acta Odontologica Turcica is the property of Acta Odontologica Turcica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Jurnal Locus: Penelitian dan Pengabdian is the property of Riviera Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The rapid increase of the Internet of Things (IoT) has led to significant growth in the development of low-power sensors. However; the biggest challenge in the expansion of the IoT is the energy dependency of the sensors. A promising solution that provides power autonomy to the IoT sensor nodes is energy harvesting (EH) from ambient sources and its conversion into electricity. Through 3D printing, it is possible to create monolithic harvesters. This reduces costs as it eliminates the need for subsequent assembly tools. Thanks to computer-aided design (CAD), the harvester can be specifically adapted to the environmental conditions of the application. In this work, a piezoelectric resonant energy harvester has been designed, fabricated, and electrically characterized. Physical characterization of the piezoelectric material and the final resonator was also performed. In addition, a study and optimization of the device was carried out using finite element modeling. In terms of electrical characterization, it was determined that the device can achieve a maximum output power of 1.46 mW when operated with an optimal load impedance of 4 MΩ and subjected to an acceleration of 1 G. Finally, a proof-of-concept device was designed and fabricated with the goal of measuring the current passing through a wire. [ABSTRACT FROM AUTHOR]

Copyright of International Journal of Computerized Dentistry is the property of Quintessence Publishing Company Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)