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Previous issue date: 2016-01-20 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Objectives: To evaluate in vitro the influence of different cavity design preparations for endocrown restorations on the fracture resistance of endodontically treated molars. Materials and methods: Fifty extracted healthy third molars were divided randomly into 5 groups (n= 10 per group): H= healthy, F1= 1 ferrule, F2= 2 ferrules (buccal and palatal), FT= total ferrule and NF= flat plateau. The teeth were submitted to root canal treatment after which the cavity preparations were made. The crowns of endocrown, in Lava Ultimate, were manufactured with the CAD-CAM CEREC/INLAB system and cemented with Single Bond Universal and Rely X Ultimate. The resistance to fracture testing was made in a universal testing machine with a speed of 1mm/min. The pattern of failure was then evaluated, taking into consideration only the presence or absence of fracture in the pulp floor. Results: (Means followed by the same letter do not differ statistically for ANOVA and Tukey): H:3970N ab; F1:3170N ab; F2: 3786N ab; TF: 2894N b; NF:4416N a. The most prevalent pattern of failure was the type recoverable in all groups. Conclusions: The type of cavity preparation for endocrown restoration may influence the fracture resistance of endodontically treated molars. The type of ferrule may determine the greater resistance to loading. The pattern of failure was predominantly recoverable. / Objetivos: avaliar in vitro a influ?ncia de diferentes designs de preparos cavit?rios para restaura??es endocrown, na resist?ncia m?xima ao carregamento de molares endodonticamente tratados. Materiais e m?todos: Cinquenta terceiros molares h?gidos e extra?dos foram divididos aleatoriamente em 5 grupos (n= 10 por grupo), H= h?gido, F1= 1 f?rula, F2 = 2 f?rulas VL(vestibular e lingual), FT= f?rula total e SF= plat? reto. Os dentes foram submetidos ? endodontia e, ap?s, realizados os preparos cavit?rios. As coroas de endocrown, em Lava Ultimate, foram confeccionadas atrav?s do sistema CAD-CAM CEREC/INLAB e cimentadas com Single Bond Universal e Rely X Ultimate. O ensaio de resist?ncia ? fratura foi realizado em uma m?quina de ensaios universal com velocidade de 1mm/min at? o rompimento do corpo de prova. Ap?s, foi avaliado o padr?o de falha o qual levou em considera??o apenas a presen?a ou n?o de fratura do assoalho pulpar. Resultados: (m?dias seguidas de mesma letra n?o apresentam diferen?a estat?stica para ANOVA e Tukey): H:3970N AB; F1:3170N AB; F2: 3786N AB; FT 2894N B; SF:4416N A. O padr?o de falha predominante foi do tipo fratura da restaura??o em todos os grupos. Conclus?es: o tipo de preparo cavit?rio para restaura??es endocrown pode influenciar na resist?ncia ? fratura de molares tratados endodonticamente. O tipo de f?rula utilizada pode determinar maior resist?ncia ao carregamento. O padr?o de falha foi predominantemente recuper?vel.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/6569 |
| Date | 20 January 2016 |
| Creators | Modena, Cl?udia Freitas de Moura |
| Contributors | Burnett Junior, Luiz Henrique |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Odontologia, PUCRS, Brasil, Faculdade de Odontologia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -8096554818733665164, 600, 600, 600, 600, 4673435736271820140, -2070498469879244349, 2075167498588264571 |
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