Removable partial dentures with Co-Cr versus PEEK structure: clinical cross-over study

Abstract

Removable partial dentures (PPRs) represent a conservative and inexpensive alternative for the rehabilitation of patients with tooth loss. However, structures of PPRs in cobalt-chromium alloy (Co-Cr) can fail to adapt, interfering with satisfaction, masticatory function and, ultimately, with the patients' diet. In this context, new materials have been researched to overcome these flaws, with emphasis on polyether-ether-ketone (PEEK), a biocompatible and resistant polymer. Thus, the aim of this study is to clinically compare the adaptation of dentures made with Co-C and PEEK structures, as well as to evaluate and compare the impact on masticatory function, satisfaction with the rehabilitation treatment and diet. For this, ten volunteers aged between 40 and 60 years will be selected and randomly allocated into two groups: (1) rehabilitated with a Co-Cr structure and (2) rehabilitated with a PEEK structure. After installation and adaptation of the prostheses, patients will be crossed, so that group (1) is rehabilitated with PEEK and group (2) with Co-Cr. The dependent variables will be verified with the old prostheses and after the adaptation of patients to the new prostheses. To verify the adaptation of the prostheses to the support structures, the method of manufacturing replicas with polyvinylsiloxane, aided by a microscope and imaging software, will be used; the masticatory efficiency will be verified using the method of fractionation in sieves; the maximum bite force will be evaluated through pressure sensors placed bilaterally in the molar teeth region and the diet will be verified through food recall. Data will be collected and subjected to exploratory analysis. Statistical analysis will be performed considering ±=0.05. (AU)