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

Grant number: 15/02461-0
Support type:Regular Research Grants
Duration: December 01, 2016 - May 31, 2019
Field of knowledge:Health Sciences - Dentistry
Principal Investigator:Marcelo Giannini
Grantee:Marcelo Giannini
Home Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil
Associated grant(s):17/50131-5 - Effect of argon plasma and primer application on the bond strength of resin cements to two yttrium-tetragonal zirconia polycrystal ceramics, AP.R


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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