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Objectives: Anterior cervical decompression and fusion (ACF) has become a widely accepted surgical treatment for degenerative cervical diseases, but occasionally, significant intraoperative blood loss (SIBL), which is defined as IBL of 500 mL or more, will occur. We aimed to investigate the independent risk factors for SIBL during ACF for degenerative cervical diseases. Methods: We enrolled 1150 patients who underwent ACF for degenerative cervical diseases at our hospital between 2013 and 2019. The patients were divided into two groups: the SIBL group (n = 38) and the non‐SIBL group (n = 1112). Demographic, surgical and radiographic data were recorded prospectively to investigate the independent risk factors for SIBL. For counting data, the chi‐square test or Fisher's exact probability test was used. Student's t‐test or the Mann–Whitney rank sum test was used for comparisons between groups of measurement data. Univariate analysis and multivariate logistic regression analysis were further used to analyze the significance of potential risk factors. Results: The incidence of SIBL during ACF was 3.3% (38/1150). A multivariate analysis revealed that female sex (odds ratio [OR], 6.285; 95% confidence interval [CI], 2.707–14.595; p < 0.001), corpectomy (OR, 3.872; 95% CI, 1.616–9.275; p = 0.002), duration of operation ≥150 min (OR, 8.899; 95% CI, 4.042–19.590; p < 0.001), C3 involvement (OR, 4.116; 95% CI, 1.808–9.369; p = 0.001) and ossification of posterior longitudinal ligament (OPLL) at the surgical level (OR, 6.007; 95% CI, 2.218–16.270; p < 0.001) were independent risk factors for SIBL. Patients with SIBL had more days of first‐degree/intensive nursing (p = 0.003), longer length of stay (p = 0.003) and higher hospitalization costs (p = 0.023). Conclusion: Female sex, corpectomy, duration of operation, C3 involvement and OPLL at the surgical level were independent risk factors for SIBL during ACF. SIBL in ACF was associated with more days of first‐degree/intensive nursing, longer length of stay and higher hospitalization costs. [ABSTRACT FROM AUTHOR]

We present a dual-layer hafnium dioxide (HfO2) grating capable of full-color modulation in the visible spectrum by leveraging the magnetic dipole resonance induced by the lower-layer HfO2 grating, while the upper-layer HfO2 grating serves as a refractive index matching layer to effectively suppress high-order Mie resonances at shorter wavelengths. The HfO2/HfO2 grating exhibits a significantly larger distribution area in the CIE 1931 chromaticity diagram compared to the HfO2 grating. Furthermore, the structural color saturation closely approximates that of monochromatic light. Under varying background refractive index environments, this structure consistently exhibits high-quality structural color. However, the hue of the structural color undergoes alterations. When the polarization angle is below 20°, the saturation of the acquired structural color remains remarkably consistent. However, exceeding 20° results in a significant degradation in the quality of the structural color. This study demonstrates the promising potential for diverse applications, encompassing fields such as imaging and displays. [ABSTRACT FROM AUTHOR]

Objectives: Unilateral percutaneous kyphoplasty (UPKP) has been effective in reducing the operative time, cement volume, and cement leakage (CL) rate compared with bilateral kyphoplasty. However, no device can help to determine the trajectory during operation, especially the inner inclination angle. To assess the safety and efficacy of a novel guide device (GD) for UPKP in the treatment of thoracolumbar osteoporotic vertebral fractures (TLOVFs). Methods: From January 2019 to May 2021, 31 patients diagnosed with single TLOVF who underwent UPKP were retrospectively reviewed. The patients were divided into two groups: traditional UPKP (UPKP group, 15 patients) and UPKP assisted with GD (UPKP‐GD group, 16 patients). Pre‐procedure demographic, clinical and radiologic characteristics, operative procedure details, and clinical and radiologic outcomes at 1 day and 12 months post‐procedure were collected. Statistical analyses were carried out using SPSS 24.0. The baseline characteristics of the two groups were compared by the independent sample t test or the χ2 test. The anterior height or local kyphotic angle (LKA) of the fractured vertebrae, visual analog scale (VAS) score, and Oswestry Disability Index (ODI) within groups were compared using the paired t test. Results: A total of 31 patients (five men and 26 women; age range: 58–90 years) completed the full 12‐month postoperative follow‐up schedule. No significant differences were observed between treatment groups with respect to sex, age, body mass index, preoperative bone mineral density, or surgical level. Compared with the UPKP group, the operation time in the UPKP‐GD group was significantly shorter (40.8 ± 5.5 min vs. 48.5 ± 8.5 min, p = 0.005), and the number of intraoperative fluoroscopy times in the UPKP‐GD group was significantly decreased (20.6 ± 4.5 vs. 25.2 ± 2.4, p = 0.001). Five (31.3%) patients in the UPKP‐GD group and four (26.7%) patients in the UPKP group had bone CL. The VAS and ODI scores, anterior height and LKA of the fractured vertebrae were significantly improved after surgery in each group. No significant differences in postoperative VAS and ODI scores, anterior height or LKA of the fractured vertebrae, volume of injected cement or CL were observed between the two groups. Conclusion: Unilateral puncture using a novel GD is a safe and effective technique for patients with TLFs and UPKP assisted with a novel GD is associated with fewer intraoperative fluoroscopy times and shorter operation time. [ABSTRACT FROM AUTHOR]

With the ageing of the global population, the incidence of osteoporotic vertebral compression fractures (OVCFs) is increasing. To assess the safety and efficacy of O-arm- and guide-device-assisted personalized percutaneous kyphoplasty (PKP) for treating thoracolumbar OVCFs, a total of 38 consecutive thoracolumbar OVCF patients who underwent bilateral PKP assisted with an O-arm and a guide device (O-GD group, n = 16) or traditional fluoroscopy (TF group, n = 22) from January 2020 to December 2021 were retrospectively reviewed, and their epidemiologic, clinical and radiological outcomes were analysed. The operation time was significantly decreased (p < 0.001) in the O-GD group (38.3 ± 12.2 min) compared with the TF group (57.2 ± 9.7 min). The number of intraoperative fluoroscopy exposures was significantly decreased (p < 0.001) in the O-GD group (31.9 ± 4.5) compared with the TF group (46.7 ± 7.2). Intraoperative blood loss was significantly decreased (p = 0.031) in the O-GD group (6.9 ± 2.5 mL) compared with the TF group (9.1 ± 3.3 mL). No significant difference (p = 0.854) in the volume of injected cement was observed between the O-GD group (6.8 ± 1.3 mL) and the TF group (6.7 ± 1.7 mL). Both the clinical and radiological outcomes, including the visual analogue scale score for pain, Oswestry Disability Index and anterior height and local kyphotic angle of the fractured vertebrae, were significantly improved at the postoperative and final follow-up but did not differ between the two groups. The incidence of cement leakage and refracture of the vertebral body was similar in the two groups (p = 0.272; p = 0.871). Our preliminary study demonstrated that O-GD-assisted PKP is a safe and effective procedure that presents a significantly shorter operation time, fewer intraoperative fluoroscopy exposures and less intraoperative blood loss than the TF technique. [ABSTRACT FROM AUTHOR]

Dental caries, particularly secondary caries, which is the main contributor to dental repair failure, has been the subject of extensive research due to its biofilm-mediated, sugar-driven, multifactorial, and dynamic characteristics. The clinical utility of restorations is improved by cleaning bacteria nearby and remineralizing marginal crevices. In this study, a novel multifunctional dental resin composite (DRC) composed of Sr-N-co-doped titanium dioxide (Sr-N-TiO2) nanoparticles and nano-hydroxyapatite (n-HA) reinforcing fillers with improved antibacterial and mineralization properties is proposed. The experimental results showed that the anatase-phase Sr-N-TiO2 nanoparticles were synthesized successfully. After this, the curing depth (CD) of the DRC was measured from 4.36 ± 0.18 mm to 5.10 ± 0.19 mm, which met the clinical treatment needs. The maximum antibacterial rate against Streptococcus mutans (S. mutans) was 98.96%, showing significant inhibition effects (p < 0.0001), which was experimentally verified to be derived from reactive oxygen species (ROS). Meanwhile, the resin exhibited excellent self-remineralization behavior in an SBF solution, and the molar ratio of Ca/P was close to that of HA. Moreover, the relative growth rate (RGR) of mouse fibroblast L929 indicated a high biocompatibility, with the cytotoxicity level being 0 or I. Therefore, our research provides a suitable approach for improving the antibacterial and mineralization properties of DRCs. [ABSTRACT FROM AUTHOR]

The success of root canal therapy depends mainly on the complete elimination of the root canal bacterial biofilm. The validity and biocompatibility of root canal disinfectant materials are imperative for the success of root canal treatment. However, the insufficiency of the currently available root canal disinfectant materials highlights that more advanced materials are still needed. In this study, a nanozyme-loaded hydrogel (Fe3O4-CaO2-Hydrogel) was modified and analyzed as a root canal disinfectant material. Fe3O4-CaO2-Hydrogel was fabricated and examined for its release profile, biocompatibility, and antibacterial activity against E. faecalis and S. sanguis biofilms in vitro. Furthermore, its efficiency in eliminating the root canal bacterial biofilm removal in SD rat teeth was also evaluated. The results in vitro showed that Fe3O4-CaO2-Hydrogel could release reactive oxygen species (ROS). Moreover, it showed good biocompatibility, disrupting bacterial cell membranes, and inhibiting exopolysaccharide production (p < 0.0001). In addition, in vivo results showed that Fe3O4-CaO2-Hydrogel strongly scavenged on root canal biofilm infection and prevented further inflammation expansion (p < 0.05). Altogether, suggesting that Fe3O4-CaO2-Hydrogel can be used as a new effective biocompatible root canal disinfectant material. Our research provides a broad prospect for clinical root canal disinfection, even extended to other refractory infections in deep sites. [ABSTRACT FROM AUTHOR]

Infrared imaging spectrometry is utilized to detect and identify targets by collecting spectral images. In some cases, the infrared spectral images of dynamic targets need to be detected accurately, such as during remote sensing target tracking and engine tail flame detection applications. However, it is difficult to obtain reliable measurement results when using a traditional infrared imaging spectrometer with a scanning structure because of motion artifacts. This work proposes a snapshot infrared imaging Fourier transform spectrometer (SIIFTS) based on stepped micromirrors and a lens array. Two micromirrors sample the spectral information, and the lens array can realize multi-aperture snapshot imaging. The spectrometer is capable of collecting three-dimensional (3D) datasets during a single measurement period, and its absence of motion artifacts and its ability to work without moving parts is very important for dynamic target detection. The achromatic optical design of the SIIFTS is completed, and two front imaging systems for remote sensing and tail flame detection applications are designed for selection. A SIIFTS prototype was built, and flame detection tests were conducted in a laboratory environment. The experimental results show that the SIIFTS developed here can accurately and stably obtain real-time image and spectral information from dynamic targets. [ABSTRACT FROM AUTHOR]

We report a theoretical study of a perfect absorber based on the metal-insulator-metal (MIM) structure, which achieves perfect absorption of single and double peaks in the visible range. The top Ag and middle SiO2 are arranged in a periodic nanopillar array. Adjusting the structural parameters of the nanopillars to indirectly control the absorption spectrum, theoretically the maximum single-peak absorption can reach more than 99.0% and the maximum double-peak absorption can reach more than 90.0%. We investigate its absorption mechanism through simulations and calculations, and explain the results well with the SPP scattering mode and F-P cavity theory. We find that through the double-peak absorption process, the mode split phenomenon appears as the thickness of SiO2 increases. Therefore, the selective appearance of absorption peaks can be achieved, which provides the possibility of application in absorbers. [ABSTRACT FROM AUTHOR]

Longwave infrared (LWIR) optics are essential for several technologies, such as thermal imaging and wireless communication, but their development is hindered by their bulk and high fabrication costs. Metasurfaces have recently emerged as powerful platforms for LWIR integrated optics; however, conventional metasurfaces are highly chromatic, which adversely affects their performance in broadband applications. In this work, the chromatic dispersion properties of metasurfaces are analyzed via ray tracing, and a general method for correcting chromatic aberrations of metasurfaces is presented. By combining the dynamic and geometric phases, the desired group delay and phase profiles are imparted to the metasurfaces simultaneously, resulting in good achromatic performance. Two broadband achromatic metasurfaces based on all-germanium platforms are demonstrated in the LWIR: a broadband achromatic metalens with a numerical aperture of 0.32, an average intensity efficiency of 31%, and a Strehl ratio above 0.8 from 9.6 μm to 11.6 μm, and a broadband achromatic metasurface grating with a constant deflection angle of 30° from 9.6 μm to 11.6 μm. Compared with state-of-the-art chromatic-aberration-restricted LWIR metasurfaces, this work represents a substantial advance and brings the field a step closer to practical applications. [ABSTRACT FROM AUTHOR]

This study aimed to investigate the effects of two antioxidants and their application time on the fracture strength of computer-aided design and computer-aided manufacturing (CAD/CAM)-fabricated ceramic laminate veneers to bleached enamel, as well as their effects on the bonding interface micromorphology. Eight groups were set: Group NC (without bleaching and antioxidant treatment); Group NA (bleaching without antioxidant treatment); Group SA30, SA60, SA120 and Group PAC30, PAC60, PAC120 (bleaching and treating with sodium ascorbate or proanthocyanidins for 30, 60, and 120 min, respectively). After cementation of veneers, fracture strength values and failure modes were analyzed. The bonding interface morphology was observed by confocal laser scanning microscopy. The fracture strength was impaired when cementation procedure was performed immediately after bleaching. This reduction in fracture strength was reestablished with antioxidant treatment, and an extended treatment time contributed to better improvement. The resin tags at the bonding interfaces of the bleached enamel were impaired. Antioxidant treatments were able to reverse this unfavorable trend.

Background: During percutaneous kyphoplasty (PKP) for the treatment of osteoporotic vertebral compression fractures (OVCFs), repeated fluoroscopic images to adjust the puncture needle and inject the polymethylmethacrylate (PMMA) are critical steps. A method to further reduce the radiation dose would be of great value., Objectives: To assess the efficacy and safety of a 3D-printed guide device (3D-GD) for PKP in the treatment of OVCFs and compare the clinical efficacy and imaging outcomes of traditional bilateral PKP, bilateral PKP with 3D-GD and unilateral PKP with 3D-GD., Study Design: Retrospective study., Setting: General Hospital of Northern Theater Command of Chinese PLA., Methods: From September 2018 through March 2021, 113 patients diagnosed with monosegmental OVCFs underwent PKP. The patients were divided into 3 groups: traditional bilateral PKP (B-PKP group, 54 patients), bilateral PKP with 3D-GD (B-PKP-3D group, 28 patients) and unilateral PKP with 3D-GD (U-PKP-3D group, 31 patients). Their epidemiologic data, surgical indices, and recovery outcomes were collected during the follow-up period., Results: The operation time was significantly shorter in the B-PKP-3D group (52.5 ± 13.7 minutes) than in the B-PKP group (58.5 ± 9.5 minutes) (P = 0.044, t = 2.082). The operation time was significantly shorter in the U-PKP-3D group (43.6 ± 6.7 minutes) than in the B-PKP-3D group (52.5 ± 13.7 minutes) (P = 0.004, t = 3.109). The number of intraoperative fluoroscopy applications was significantly lower in the B-PKP-3D group (36.8 ± 6.1) than in the B-PKP group (44.8 ± 7.9) (P = 0.000, t = 4.621). The number of intraoperative fluoroscopy times was significantly lower in the U-PKP-3D group (23.2 ± 4.5) than in the B-PKP-3D group (36.8 ± 6.1) (P = 0.000, t = 9.778). The volume of injected PMMA was significantly lower in the U-PKP-3D group (3.7 ± 0.8 mL) than in the B-PKP-3D group (6.7 ± 1.7 mL) (P = 0.000, t = 8.766). The Visual Analog Scale (VAS) and Oswestry Disability Index (ODI) scores were significantly decreased one day after surgery in each group. However, there were no differences in postoperative VAS and ODI scores, anterior height or local kyphotic angle of the fractured vertebrae, PMMA leakage, or refracture of the vertebral body., Limitations: Relatively small sample size and short-term follow-up period., Conclusion: This new innovative 3D technique makes PKP safe and effective. The bilateral PKP with 3D-GD technique, even unilateral PKP with 3D-GD, has the advantages of accurate positioning, a short operation time, and reduced intraoperative fluoroscopy times to the patient and surgeon.

In this paper, we proposed a double-layer all-dielectric grating. Under the premise of ensuring the strength of the resonance peak, the upper SiO 2 grating layer suppresses the tendency of high-order dipole resonance excitation and improves the transmittance at the non-resonant position (T > 99%). The distribution of chromaticity coordinates on the CIE 1931 chromaticity diagram also proves that suppressing side peaks can effectively increase the saturation of structural colors, which is essential for a high precision imaging system. The cyclic displacement current excites the magnetic dipole resonance, which causes the magnetic field to be confined in the high refractive index material HfO 2 grating layer. By adjusting the duty cycle of the grating structure, a reflection spectrum with low full width half maximum (FWHM) (∼2 nm) and high-quality factor Q (∼424.5 nm) can be obtained. And the spectral intensity is more sensitive to the polarization angle. This work is of great significance to the development of sensors, display imaging and other fields. At the same time, the material of the grating filter meets the requirements of high damage threshold of the high-power laser system, and its high-power laser application potential is inestimable.

We propose a novel cavity-coupled MIM nano-hole array structure that exhibits a tunable dual passband in the near-infrared regime. When compared with the traditional single metal film, the designed structure provides a coupling effect between Gspp and SPP to significantly reduce the linewidths of the two transmission peaks. We also reveal the physical origin of the positive and negative influence of the cavity effect on the transmission of high-frequency and low-frequency peaks. This work supplies a new modulation theory for plasmonic devices based on the EOT phenomenon and has a wide application prospect in the fields of infrared sensor, plasmonic filter, and hyperspectral imaging.