Diseño y construcción de una máquina para realizar ensayos con cargas cíclicas en materiales utilizados en prótesis dentales

Abstract

The present work has to design and build a machine to perform tests with cyclic loads on materials used in dental prostheses. The main use of the machine is the generation of stress – number of cycles (S-N) for the characterization of these types of materials. The applied force by the machine was determined according to the maximum force of the human bite. In order, to corroborate the design and calculations the tests were carried out on 65x10x5 mm polymethacrylate (Veracryl-Termocurado) specimens which were made according to the specifications of the ADA 12 standard. For the elaboration of the S-N curve, the initial value was taken on the 1 / 3 of the maximum load a static flexion which was approximately 100 N from which an increase was made every 10 N until the values in which the cycles were less than 10. At the end the tests were obtained that the maximum effort applied to the polymethacrylate specimens were 68.82 MPa being broken at 7 cycles, the smaller was applied to 33.54 MPa breaking to 32684 cycles.