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Load to failure and fatigue resistance of CAD/CAM crowns: evaluation of prosthetic materials and adhesive luting procedures


The computer-aided design and computer-aided manufacturing (CAD / CAM system) is the evolution of computer technology applied to Dentistry. Indirect restorations can be made by CAD / CAM system using various indirect materials, however the restoration longevity depends on the preservation of tooth intact structure, cavity preparation technique, type of indirect material and cementation technique. Objectives: To evaluate the influence of cementation technique and thicknesses of indirect material on fatigue resistance, load-to-failure and, failure mode of complete molar CAD/CAM crowns. The following material will be used: di- (DL) and lithium disilicate (LD), zirconia (ZI) and indirect composite (CI). In the Part I of this project, indirect restorative materials will be tested following different thicknesses, while in the Part II, ZI will be evaluate according to argon plasma treatment and resin cement types. Materials and methods: Human molars will receive standardized complete crown preparations and will be restored with CAD/CAM crowns. In the study using different crown thicknesses (0.5; 1.0 or 1.5 mm thick) all materials will be tested (DL, SL, ZI e CI). In the second part of this project, tooth and/or ZI will be treated with argon plasma and crown placed with self-adhesive or conventional resin cement. After cementation the crowns will be submit to cyclic isometric loading 200 N (until 1,400 N) at a maximum of 30,000 cycles each. Surviving specimens will be axially loaded until failure. The specimens will be analyzed according to the failure mode. The groups will be compared using the life table survival analysis and T test. For all statistical analyses, the level of significance will be set at 95%. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
AZEVEDO, VEBER LUIZ BOMFIM; DE CASTRO, EDUARDO FERNANDES; BONVENT, JEAN-JACQUES; DE ANDRADE, OSWALDO SCOPIN; NASCIMENTO, FABIO DUPART; GIANNINI, MARCELO; CAVALLI, VANESSA. Surface treatments on CAD/CAM glass-ceramics: Influence on roughness, topography, and bond strength. Journal of Esthetic and Restorative Dentistry, v. 33, n. 5, p. 739-749, . (15/02461-0)
DE CASTRO, EDUARDO FERNANDES; BOMFIM AZEVEDO, VEBER LUIZ; NIMA, GABRIEL; DE ANDRADE, OSWALDO SCOPIN; DOS SANTOS DIAS, CARLOS TADEU; GIANNINI, MARCELO. Adhesion, Mechanical Properties, and Microstructure of Resin-matrix CAD-CAM Ceramics. Journal of Adhesive Dentistry, v. 22, n. 4, p. 421-431, . (15/02461-0)
NORONHA, MAYARA DOS SANTOS; DE CARVALHO, MARCO AURELIO; ANH QUYNH DO; DE ARAUJO NETO, VITALIANO GOMES; CAMPOS, CAMILA HEITOR; GIANNINI, MARCELO; MAGNE, PASCAL. Effect of thickness and CAD-CAM material on fatigue resistance of endodontically treated molars restored with occlusal veneers. JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY, v. 32, n. 2, p. 11-pg., . (17/04257-7, 15/02461-0, 19/11658-3)

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