Uma nova proposta de retenção intrarradicular na dentição decídua: análise biomecânica de incisivos decíduos bovinos cimentados com fibra de vidro ou pino de fibra de vidro em diferentes comprimentos de alívio

Abstract

The use of different intraradicular techniques and retainers to rehabilitate deciduous teeth with great coronary destruction is controversial, given the complexity of factors involved. The aim of this study was to evaluate, through biomechanical analyzes, two different materials used as posts system cemented in two different lengths. Forty bovine primary incisor roots were used for the study, sectioned with 12mm, treated endodontically, and randomly divided into 2 groups (n = 20): fiber post (FP) and braided pre-impregnated glass fiber (PGF). Subsequently, they were divided into 2 subgroups (n = 10), varying the length of the retainer: 1/2 of the root (6mm) and 1/3 of the root (4mm). All roots were restored with conventional composite resin with the aid of a polyvinyl chloride (PVC) matrix. Extensometry and fracture resistance tests were performed. The data obtained were analyzed using two-way ANOVA and Tukey, with significance level =0.05. The results obtained were similar between groups for length ½. For 1/3, FP showed better deformation results (p <0.001) than F. In the fracture pattern, F was better, with reversible fractures (type I). In conclusion, in this study, the FP and PGF retainers showed resistance and deformation, therefore, both are indicated for intraradicular retention in the primary dentition.