Influência do implante na distribuição de tensão em próteses parciais removíveis de extremidade livre: estudo fotoelástico

Abstract

The removable partial prosthesis (RPP) is dispositive constructed with the objective of esthetical and functional rehabilitations of the teeth and absent tissues of patients partially edentulous. When confected for patients who lost posterior teeth uni or bilaterally, the distribution of mastigatory force is not equal, always occurring overstress in the direct pillar teeth. It have been demonstrated that the position of one dental implant in the region of second molar divide in a equanimity way the force and consequentially preserve the pillar teeth. In this way, this study objectived compare qualitatively, using the photoelastic method, the distribution of tensions and deformations in the structures of support of removable partial prosthesis with free extremity in conventional class II of Kennedy and associated with dental osseous intergraded implants with 2 different diameters. To this analyze was obtained three photoelastic models; one for conventional prosthesis, one for removable partial prosthesis associated with 3,75mm diameter implant and other for removable partial prosthesis associated with 5,00mm diameter implant. After the construction and adaptation of the prostheses in the models, an application of a statically force of 1,300kgf in the three photoelastic models obtained, was performed photography s of the models in a correct position in the polariscope for the qualitative analyze of tensions. The results demonstrated that the models with implants don t reductive the tensions in pillar teeth of RPP of free extremity and the implant of 5,00mm if diameter promoted the better distribution of tensions between teeth and implant.