The wear resistance is an important characteristic that should be considered in the evaluation of the clinical longevity of a restorative material. This is an extremely important characteristic because the low wear resistance can take to an occlusal disharmony and consequent decrease of the masticatory efficiency. The objective of this study is to analyze the wear resistance of Cp Titanium related to the following restorative materials: Co-Cr and Ni-Cr alloys, ceramic and direct composite resin. The methodology for accomplishment of this research will be based in that of Iijima et al., Teoh et al. and Dahl and Oilo. Samples like a hemisphere with 5mm radium will be obtained in Cp titanium. The antagonists will be made like tablets with 20mm diameter and 3mm thickness in Co-Cr and Ni-Cr alloys, ceramic and direct composite resin. Previously to the accomplishment of the wear test the samples will be identified and taken to the profile projector for the registration of the original outline in graph paper and they will also be weighted in precision scale. The wear resistance test will be accomplished in equipment developed in the Department of Dental Materials and Prosthodontics of Dental School of Ribeirão Preto - USP with speed of 240 cicles/min and course of 10mm, resulting in the speed of 80mm/s for the test. After the accomplishment of the test, the samples will be removed, dried, weighted again, and his final outline will be registered in the perfilometer, in the same graph paper previously used. The measure of the wear will be determined by the difference between the two contours, using a digital caliper (accuracy: 0.01mm). The number of samples will be determined in the pilot study and the obtained data will be analyzed with appropriate statistical test.
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