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Effect of cavity preparation design and ceramic type on the stress distribution, strain and fracture resistance of CAD/CAM onlays in molars
Vianna, Ana Luíza Serralha de Velloso; Prado, Célio Jesus do; Bicalho, Aline Aredes; Pereira, Renata Afonso da Silva; Neves, Flávio Domingues das; Soares, Carlos José.
  • Vianna, Ana Luíza Serralha de Velloso; Universidade Federal de Uberlândia. Faculdade de Odontologia. Departamento de Prótese e Materiais Odontológicos. Uberlândia. BR
  • Prado, Célio Jesus do; Universidade Federal de Uberlândia. Faculdade de Odontologia. Departamento de Prótese e Materiais Odontológicos. Uberlândia. BR
  • Bicalho, Aline Aredes; Universidade Federal de Uberlândia. Escola Técnica de Saúde. Uberlândia. BR
  • Pereira, Renata Afonso da Silva; Universidade Federal de Uberlândia. Faculdade de Odontologia. Departamento de Dentística e Materiais Odontológicos. Uberlândia. BR
  • Neves, Flávio Domingues das; Universidade Federal de Uberlândia. Faculdade de Odontologia. Departamento de Oclusão, Prótese Fixa e Materiais Odontológicos. Uberlândia. BR
  • Soares, Carlos José; Universidade Federal de Uberlândia. Faculdade de Odontologia. Departamento de Dentística e Materiais Odontológicos. Uberlândia. BR
J. appl. oral sci ; 26: e20180004, 2018. tab, graf
Article in English | LILACS, BBO | ID: biblio-954510
ABSTRACT
Abstract Objective This study aimed to evaluate the effect of the cavity preparation and ceramic type on the stress distribution, tooth strain, fracture resistance and fracture mode of human molar teeth restored with onlays. Material and Methods Forty-eight molars were divided into four groups (n=12) with assorted combinations of two study factors BL- conventional onlay preparation with boxes made from leucite ceramic (IPS-Empress CAD, Ivoclar Vivadent); NBL- conservative onlay preparation without boxes made from leucite ceramic; BD- conventional onlay preparation with boxes made from lithium disilicate glass ceramic (IPS e.max CAD, Ivoclar Vivadent); NBL- conservative onlay preparation with boxes made from lithium disilicate glass ceramic cuspal deformation (µS) was measured at 100 N and at maximum fracture load using strain gauge. Fracture resistance (N) was measured using a compression test, and the fracture mode was recorded. Finite element analysis was used to evaluate the stress distribution by modified von Mises stress criteria. The tooth strain and fracture resistance data were analyzed using the Tukey test and two-way ANOVA, and the fracture mode was analyzed by the chi-square test (α=0.05). Results The leucite ceramic resulted in higher tooth deformation at 100 N and lower tooth deformation at the maximum fracture load than the lithium disilicate ceramic (P<0.001). The lithium disilicate ceramic exhibited higher fracture resistance than the leucite ceramic (P<0.001). The conservative onlay resulted in higher fracture strength for lithium disilicate ceramic. Finite element analysis results showed the conventional cavity preparation resulted in higher stress concentration in the ceramic restoration and remaining tooth than the conservative onlay preparation. The conservative onlays exhibited increased fracture resistance, reduced stress concentration and more favorable fracture modes. Conclusion Molars restored with lithium disilicate CAD-CAM ceramic onlays exhibited higher fracture resistance than molars restored with leucite CAD-CAM ceramic onlays.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Ceramics / Computer-Aided Design / Dental Cavity Preparation / Dental Porcelain / Aluminum Silicates / Inlays Type of study: Evaluation studies Limits: Humans Language: English Journal: J. appl. oral sci Journal subject: Dentistry Year: 2018 Type: Article Affiliation country: Brazil Institution/Affiliation country: Universidade Federal de Uberlândia/BR

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Full text: Available Index: LILACS (Americas) Main subject: Ceramics / Computer-Aided Design / Dental Cavity Preparation / Dental Porcelain / Aluminum Silicates / Inlays Type of study: Evaluation studies Limits: Humans Language: English Journal: J. appl. oral sci Journal subject: Dentistry Year: 2018 Type: Article Affiliation country: Brazil Institution/Affiliation country: Universidade Federal de Uberlândia/BR