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Titanium dental meshes have a wide application in order to ensure the retention of calcium phosphate-based biomaterials to regenerate bone tissue. These meshes are temporary and must grow a soft tissue to prevent bacterial colonization and provide stability. In this work, we aimed to optimize the roughness of the meshes to obtain a good biological seal while maintaining a behavior that did not favor bacterial colonization. To this end, six types of surfaces were studied: machined as a control, polished, sandblasted with three different alumina sizes and sintered. The roughness, contact angles and biological behavior of the samples using fibroblast cultures at 7, 24 and 72 h were determined as well as cytotoxicity studies. Cultures of two very common bacterial strains in the oral cavity were also carried out: Streptococcus sanguinis and Lactobacillus salivarius. The results showed that the samples treated with alumina particles by sandblasting at 200 micrometers were the ones that performed best with fibroblasts and also with the number of bacterial colonies in both strains. According to the results, we see in this treatment a candidate for the surface treatment of dental meshes with an excellent performance. info:eu-repo/semantics/publishedVersion

Objective: To evaluate the peri-implant hard tissue change at 6 and 12 months after implant placement between definitive abutment placed at the same time of implant surgery, never removing it, and healing abutment disconnected and reconnected three times until the placement of the final rehabilitation. Material and methods: Each partial edentulous patient could receive between 1 and 4 platform-switched implants in the posterior regions. If the implants had primary stability—implant stability quotient (ISQ) equal to or greater than 50, they were randomized to the test group with the abutment inserted at the same time of implant placement (DA) or to the control group, receiving a healing abutment (PA). At 6 and 12 months after surgery, data related with vertical bone level changes (primary outcome) and other clinical parameters (implant mobility, bleeding on probing, probing depth, plaque index) were assessed. Results: 53 implants were included in the trial and completed 12 months follow-up (overall survival rate: 100%). All implants achieved primary stability, with an average ISQ value of 80.9 on the day of surgery. From surgery to 6 months, the mean bone loss was 0.14 ± 0.18 mm for the DA group and 0.23 ± 0.29 mm for the PA group, without statistical significance difference. Between 6 and 12 months, the mean bone loss was 0.14 ± 0.21 mm for the DA group and 0.21 ± 0.27 mm for the PA group, also without statistical significance between the two groups. There were no statistically significant differences (p = 0.330) in total bone loss after 12 months between the control and the study groups. Conclusions: The one abutment one time protocol has at least an equivalent effect on the peri-implant bone level changes when compared with the use of healing abutments that are disconnected and reconnected at least three times.

The use of individualized titanium meshes has been referred to in scientific literature since 2011. There are many advantages to its use, however, the main complications are related to early or late exposures. As some aspects such as its surface properties have been pointed out to influence the soft tissue response, this study was designed to compare the surface characteristics of three commercially available individualized titanium meshes between them and according to the manufacturer&rsquo, s specifications. The results from the scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction and the contact profilometry measurements were analyzed and cross-checked. It was discovered that, the BoneEasy&rsquo, s post-processing superficial treatment was more refined, as it delivers the mesh with the lowest Ra value, 0.61 &plusmn, 0.14 &micro, m, due to the applied electropolishing. On the other hand, the Yxoss CBR&reg, mesh from ReOss&reg, was sandblasted, presenting an extremely rough surface with a Ra of 6.59 &plusmn, 0.76 &micro, m.

Em Dezembro de 2019, o mundo assistiu à emergência de uma zoonose provocada por um novo tipo de Corona vírus o SARS CoV 2. Esta infeção rapidamente evoluiu para uma disseminação pandémica com consequências pesadas em todos os planos civilizacionais. O SARS CoV 2 e a Covid 19 persistem presentemente sem previsões para a sua eliminação, com grande incerteza sobre a sua evolução e extensão quer das consequências sanitárias quer do impacto económico. Desta forma importa desenvolver estratégias que possibilitem o funcionamento das estruturas produtivas, combatendo o congelamento económico e social enquanto consequências absolutamente nefastas no contexto pandémico. A Medicina Dentária, pela sua natureza, nomeadamente a produção de aerossóis, foi classificada como sendo uma atividade no topo do risco de aquisição/disseminação da doença por parte dos profissionais que a exercem. Muitos países suspenderam o exercício de Medicina Dentária como medida preventiva. Importa, pois, agora e na perspetiva de regresso criar mecanismos que permitam o exercício profissional em segurança. No entanto existe uma lacuna extensa sobre a própria definição de segurança no exercício profissional em Medicina Dentária no contexto SARS CoV 2 /Covid 19. O objetivo destas Normas de Orientação Clínica (NOC) foi compilar de forma sistematizada a evidência existente sobre esta temática e conferir a maior robustez possível à decisão clínica no pré per e pós consulta.

Em Dezembro de 2019, o mundo assistiu à emergência de uma zoonose provocada por um novo tipo de Corona vírus o SARS CoV 2. Esta infeção rapidamente evoluiu para uma disseminação pandémica com consequências pesadas em todos os planos civilizacionais. O SARS CoV 2 e a Covid 19 persistem presentemente sem previsões para a sua eliminação, com grande incerteza sobre a sua evolução e extensão quer das consequências sanitárias quer do impacto económico. Desta forma importa desenvolver estratégias que possibilitem o funcionamento das estruturas produtivas, combatendo o congelamento económico e social enquanto consequências absolutamente nefastas no contexto pandémico. A Medicina Dentária, pela sua natureza, nomeadamente a produção de aerossóis, foi classificada como sendo uma atividade no topo do risco de aquisição/disseminação da doença por parte dos profissionais que a exercem. Muitos países suspenderam o exercício de Medicina Dentária como medida preventiva. Importa, pois, agora e na perspetiva de regresso criar mecanismos que permitam o exercício profissional em segurança. No entanto existe uma lacuna extensa sobre a própria definição de segurança no exercício profissional em Medicina Dentária no contexto SARS CoV 2 /Covid 19. O objetivo destas Normas de Orientação Clínica (NOC) foi compilar de forma sistematizada a evidência existente sobre esta temática e conferir a maior robustez possível à decisão clínica no pré per e pós consulta.

Em Dezembro de 2019, o mundo assistiu à emergência de uma zoonose provocada por um novo tipo de Corona vírus o SARS CoV 2. Esta infeção rapidamente evoluiu para uma disseminação pandémica com consequências pesadas em todos os planos civilizacionais. O SARS CoV 2 e a Covid 19 persistem presentemente sem previsões para a sua eliminação, com grande incerteza sobre a sua evolução e extensão quer das consequências sanitárias quer do impacto económico. Desta forma importa desenvolver estratégias que possibilitem o funcionamento das estruturas produtivas, combatendo o congelamento económico e social enquanto consequências absolutamente nefastas no contexto pandémico. A Medicina Dentária, pela sua natureza, nomeadamente a produção de aerossóis, foi classificada como sendo uma atividade no topo do risco de aquisição/disseminação da doença por parte dos profissionais que a exercem. Muitos países suspenderam o exercício de Medicina Dentária como medida preventiva. Importa, pois, agora e na perspetiva de regresso criar mecanismos que permitam o exercício profissional em segurança. No entanto existe uma lacuna extensa sobre a própria definição de segurança no exercício profissional em Medicina Dentária no contexto SARS CoV 2 /Covid 19. O objetivo destas Normas de Orientação Clínica (NOC) foi compilar de forma sistematizada a evidência existente sobre esta temática e conferir a maior robustez possível à decisão clínica no pré per e pós consulta.

Passivation of titanium alloy dental meshes cleans their surface and forms a thin layer of protective oxide (TiO2) on the surface of the material to improve resistance to corrosion and prevent release of ions to the physiological environment. The most common chemical agent for the passivation process of titanium meshes is hydrochloric acid (HCl). In this work, we introduce the use of Piranha solution (H2SO4 and H2O2) as a passivating and bactericidal agent for metallic dental meshes. Meshes of grade 5 titanium alloy (Ti6Al4V) were tested after different treatments: as-received control (Ctr), passivated by HCl, and passivated by Piranha solution. Physical-chemical characterization of all treated surfaces was carried out by scanning electron microscopy (SEM), confocal microscopy and sessile drop goniometry to assess meshes’ topography, elemental composition, roughness, wettability and surface free energy, that is, relevant properties with potential effects for the biological response of the material. Moreover, open circuit potential and potentiodynamic tests were carried out to evaluate the corrosion behavior of the differently-treated meshes under physiological conditions. Ion release tests were conducted using Inductively Coupled Plasma mass spectrometry (ICP-MS). The antibacterial activity by prevention of bacterial adhesion tests on the meshes was performed for two different bacterial strains, Pseudomonas aeruginosa (Gram-) and Streptococcus sanguinis (Gram+). Additionally, a bacterial viability study was performed with the LIVE/DEAD test. We complemented the antibacterial study by counting cells attached to the surface of the meshes visualized by SEM. Our results showed that the passivation of titanium meshes with Piranha solution improved their hydrophilicity and conferred a notably higher bactericidal activity in comparison with the meshes passivated with HCl. This unique response can be attributed to differences in the obtained nanotextures of the TiO2 layer. However, Piranha solution treatment decreased electrochemical stability and increased ion release as a result of the porous coating formed on the treated surfaces, which can compromise their corrosion resistance. Framed by the limitations of this work, we conclude that using Piranha solution is a viable alternative method for passivating titanium dental meshes with beneficial antibacterial properties that merits further validation for its translation as a treatment applied to clinically-used meshes. info:eu-repo/semantics/publishedVersion

Narrow diameter implants may be at increased risk of overload due to occlusal forces; therefore, implants with higher fatigue strength may be beneficial. The aim of this observational study was to evaluate survival and success of narrow diameter (Ø 3.3 mm) TiZr alloy (Roxolid, Institut Straumann AG, Basel, Switzerland) implants for 2 years in daily dental practice. This was a prospective, non-interventional, multicenter study; no specific patient inclusion or exclusion criteria were applied. Each patient received at least one TiZr implant; the treatment plan, including implant loading and final restoration, was at the investigator's discretion. The primary outcome was implant survival and success after 1 year. Secondary outcomes included 2-year survival and success and marginal bone level change. A total of 603 implants were placed in 357 patients. Cumulative survival and success rates were 97.8% and 97.6%, respectively, after 1 year and 97.6% and 97.4%, respectively, after 2 years. Bone levels remained stable in the majority of patients, and soft tissue remained stable up to 2 years. Within the limitations of a non-interventional study design, TiZr implants showed excellent survival and success with minimal bone loss up to 2 years in daily dental practice. The results compare favorably with those of small-diameter implants in controlled clinical trials.