Influência de diferentes protocolos de queima do glaze sobre tenacidade à fratura e crack healing em blocos cerâmicos CAD/CAM
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Data
2023-11-30
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Universidade Estadual Paulista (Unesp)
Resumo
O desenvolvimento constante das restaurações livres de metal e a tecnologia uniram as cerâmicas e o CAD/CAM há anos, e a evolução destes materiais cerâmicos, assim como do sistema digital têm sido crescentes. O objetivo deste estudo foi investigar a influência de diferentes protocolos de queima do glaze sobre a tenacidade à fratura e mecanismo crack healing em blocos cerâmicos CAD/CAM (IPS E.max CAD, IPS Empress CAD e Cerec Blocs). Para o teste de tenacidade à fratura foram confeccionados, a partir de blocos CAD/CAM, 120 corpos de prova, sendo 40 de cada material, divididos em 5 grupos: Controle (C), Glaze Convencional (G), Glaze Convencional com 2 Queimas (G2), Queima Estendida do Glaze (EG) e Queima Estendida do Glaze com 2 Queimas (EG2). Para a avaliação da tenacidade à fratura foi realizado o teste de indentação. O mecanismo de crack healing foi observado qualitativamente utilizando microscopia eletrônica de varredura. Os valores de tenacidade à fratura foram submetidos ao teste ANOVA, seguido por teste de Tukey ao nível de significância de 5%. Os resultados demonstraram que os diferentes materiais, ainda que apresentando valores médios diferentes entre si, apresentaram também comportamentos semelhantes frente aos diferentes protocolos de queima do glaze. Para todos os materiais testados, os protocolos de glaze estendido, seja de única aplicação ou em 2 queimas, apresentou maiores valores de tenacidade à fratura. Considerando um mesmo tratamento, o material Emax apresentou sempre os maiores valores em relação aos outros materiais (CerecBlocs e Empress).
The constant development of metal-free restorations and technology has united ceramics and CAD/CAM for years, and the evolution of these ceramic materials, as well as the digital system has been increasing. The objective of this study was to investigate the influence of different glaze firing protocols on fracture toughness and crack healing mechanism in CAD/CAM ceramic blocks (IPS E.max CAD, IPS Empress CAD and Cerec Blocs). For the fracture toughness test, from CAD/CAM blocks, 120 specimens, 40 of each material, divided into 5 groups: Control (C), Conventional Glaze (G), Conventional Glaze with 2 Shots (G2), Extended Glaze Firing (EG) and Extended Glaze Firing with 2 Shots (EG2). Fracture toughness was assessed using the indentation test. The crack healing mechanism was observed qualitatively using scanning electron microscopy. Fracture toughness values were submitted to the ANOVA test, followed by Tukey's test at a significance level of 5%. The results showed that the different materials, although presenting different average values among themselves, also showed similar behaviors in the face of the different glaze firing protocols. For all materials tested, the extended glaze protocols, whether single application or 2 firing, showed higher fracture toughness values. Considering the same treatment, the Emax material always presented the highest values in relation to the other materials (CerecBlocs and Empress).
The constant development of metal-free restorations and technology has united ceramics and CAD/CAM for years, and the evolution of these ceramic materials, as well as the digital system has been increasing. The objective of this study was to investigate the influence of different glaze firing protocols on fracture toughness and crack healing mechanism in CAD/CAM ceramic blocks (IPS E.max CAD, IPS Empress CAD and Cerec Blocs). For the fracture toughness test, from CAD/CAM blocks, 120 specimens, 40 of each material, divided into 5 groups: Control (C), Conventional Glaze (G), Conventional Glaze with 2 Shots (G2), Extended Glaze Firing (EG) and Extended Glaze Firing with 2 Shots (EG2). Fracture toughness was assessed using the indentation test. The crack healing mechanism was observed qualitatively using scanning electron microscopy. Fracture toughness values were submitted to the ANOVA test, followed by Tukey's test at a significance level of 5%. The results showed that the different materials, although presenting different average values among themselves, also showed similar behaviors in the face of the different glaze firing protocols. For all materials tested, the extended glaze protocols, whether single application or 2 firing, showed higher fracture toughness values. Considering the same treatment, the Emax material always presented the highest values in relation to the other materials (CerecBlocs and Empress).
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Desenho assistido por Ccmputador, Cerâmica, Cristalização, Computer-aided design Ceramics. Crystallization., Ceramics, Crystallization
Como citar
Sacomani BR. Influence of different glaze firing protocols on fracture toughness and crack healing in ceramic CAD/CAM block.[Trabalho de Conclusão de Curso – Graduação em Odontologia]. Araraquara: Faculdade de Odontologia da UNESP;
2023.