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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.
J Appl Oral Sci. 2018; 26:e20180004.JA

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.

Authors+Show Affiliations

Departamento de Prótese e Materiais Odontológicos, Faculdade de Odontologia, Universidade Federal de Uberlândia, Uberlândia, Minas Gerais, Brasil.Departamento de Prótese e Materiais Odontológicos, Faculdade de Odontologia, Universidade Federal de Uberlândia, Uberlândia, Minas Gerais, Brasil.Escola Técnica de Saúde, Universidade Federal de Uberlândia, Uberlândia, Minas Gerais, Brasil.Departamento de Dentística e Materiais Odontológicos, Faculdade de Odontologia, Universidade Federal de Uberlândia, Uberlândia, Minas Gerais, Brasil.Departamento de Oclusão, Prótese Fixa e Materiais Odontológicos, Faculdade de Odontologia, Universidade Federal de Uberlândia, Uberlândia, Minas Gerais, Brasil.Departamento de Dentística e Materiais Odontológicos, Faculdade de Odontologia, Universidade Federal de Uberlândia, Uberlândia, Minas Gerais, Brasil.

Pub Type(s)

Evaluation Study
Journal Article

Language

eng

PubMed ID

30133672

Citation

Vianna, Ana Luíza Serralha de Velloso, et al. "Effect of Cavity Preparation Design and Ceramic Type On the Stress Distribution, Strain and Fracture Resistance of CAD/CAM Onlays in Molars." Journal of Applied Oral Science : Revista FOB, vol. 26, 2018, pp. e20180004.
Vianna ALSV, Prado CJD, Bicalho AA, et al. Effect of cavity preparation design and ceramic type on the stress distribution, strain and fracture resistance of CAD/CAM onlays in molars. J Appl Oral Sci. 2018;26:e20180004.
Vianna, A. L. S. V., Prado, C. J. D., Bicalho, A. A., Pereira, R. A. D. S., Neves, F. D. D., & Soares, C. J. (2018). Effect of cavity preparation design and ceramic type on the stress distribution, strain and fracture resistance of CAD/CAM onlays in molars. Journal of Applied Oral Science : Revista FOB, 26, e20180004. https://doi.org/10.1590/1678-7757-2018-0004
Vianna ALSV, et al. Effect of Cavity Preparation Design and Ceramic Type On the Stress Distribution, Strain and Fracture Resistance of CAD/CAM Onlays in Molars. J Appl Oral Sci. 2018;26:e20180004. PubMed PMID: 30133672.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of cavity preparation design and ceramic type on the stress distribution, strain and fracture resistance of CAD/CAM onlays in molars. AU - Vianna,Ana Luíza Serralha de Velloso, AU - Prado,Célio Jesus do, AU - Bicalho,Aline Aredes, AU - Pereira,Renata Afonso da Silva, AU - Neves,Flávio Domingues das, AU - Soares,Carlos José, Y1 - 2018/08/20/ PY - 2018/02/25/received PY - 2018/05/28/accepted PY - 2018/8/23/entrez PY - 2018/8/23/pubmed PY - 2018/9/7/medline SP - e20180004 EP - e20180004 JF - Journal of applied oral science : revista FOB JO - J Appl Oral Sci VL - 26 N2 - 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. SN - 1678-7765 UR - https://www.unboundmedicine.com/medline/citation/30133672/Effect_of_cavity_preparation_design_and_ceramic_type_on_the_stress_distribution_strain_and_fracture_resistance_of_CAD/CAM_onlays_in_molars_ DB - PRIME DP - Unbound Medicine ER -