Objetivo: Avaliar, in vitro, a ação antimicrobiana e a influência de agentes desinfetantes sobre a reprodução de detalhes de siliconas de moldagem (Elite HD+ e Zetaplus/Oranwash) e a compatibilidade com o gesso (Elite Rock). Métodos: O estudo foi dividido em três partes: estudo da reprodução de detalhes, estudo da compatibilidade com o gesso e estudo da ação antimicrobiana. Para a reprodução de detalhes foram confeccionados, moldes em silicona de adição (Elite HD+) e silicona de condensação (Zetaplus/Oranwash) utilizando uma matriz conforme a especificação nº 19 da ADA. Foram utilizadas 10 amostras para cada grupo, as quais foram desinfetadas com “sprays” das soluções desinfetantes (Hipoclorito de sódio 2,5%, Glutaraldeído 2%, Clorexidina 2%, Ácido peracético 0,2%), exceto àquelas do grupo controle. Resultados: Foi possível a observação da linha de 20 ± 4µm de espessura em todos os moldes e modelos. Bem como, a não turvação dos meios de cultura contendo os moldes submetidos ao protocolo de desinfecção. Conclusão: O hipoclorito de sódio 2,5%, glutaraldeído 2%, clorexidina 2% e ácido peracético 0,2% possuem ação antimicrobiana sobre as siliconas testadas contaminadas com Staphylococcus aureus e não alteraram a reprodução de detalhes das mesmas, nem tampouco a sua compatibilidade com o gesso avaliado.
In the past, aesthetics had a secondary role in implant rehabilitation. Nowadays, the search for a perfect and harmonious aesthetic has stimulated the development of new materials and techniques. Due to this aesthetic requirement, the hybrid abutment (titanium link + zirconia) emerged as an alternative to metallic pillars. The hybrid abutment made a more favorable aesthetic possible, provided reliable mechanical properties, and increased biocompatibility to the surrounding tissues. Additionally, the individual zirconia abutment improves the emergency profile and the final white aesthetics. The objective of this paper is to report a clinical case with a manufactured individualized hybrid abutment for a metal-free indirect restoration, showing the applicability, mechanical properties, and biocompatibility of the hybrid abutment.
Objective: The aim of the present study was to compare the fracture strength of endodontically restored teeth with glass-fiber pin and experimental pin of computer-aided design / computer-aided manufacturing (CAD / CAM). Methodology: A total of 20 bovine incisors with sectioned crowns and roots were prepared with 15mm length were randomly divided into two groups (n = 10): G1 - pin fiber glass (control) and G2 - pin machined (experimental). In both groups, the samples had their root canals treated endodontically. The roots were included in acrylic resin, the pins cemented with dual resin cement and subsequently subjected to the compression fracture strength test at a speed of 0.05 mm / min under a 45 ° angle in a universal test machine until the fracture. The values of fracture resistance were submitted to Student's t-test with the SPSS program with a significance level of 5%. Results: According to the tests, the results required strength at fracture was lower in the pre-fabricated custom (48.2kgf) fiber pin group than the group of pins milled by the CAD / CAM system (56.9kgf), however no there was a statistical difference between them (p = 0.26). With a mean SD ± 14.6 for the first and ± 19.0 for the second group. Conclusion: Fiber pins developed by CAD / CAM technology may appear as a viable alternative for intraradicular restorations of endodontically treated elements, since there was no statistical difference in fracture resistance with pre-fabricated pins.
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