Avaliação da precisão de metodos utilizados na determinação do desajuste das bases de protese total




The aim of this study was to evaluate the accuracy of two measurement methods used for the detennination of the adaptation and stability of denture bases made of thermopolymerizing acrilic resin. One rubber mold was used to produce ten identical maxillary edentulous casts in dental stone. Ten denture bases were included into flasks and processed by the conventional method of polymerization (thennostatically controlled water bath for 9 hours at 74 :t2°C) above the dental casts. After cooling at room temperature, the denture bases were removed ITom the flasks, cleaned and trimmed. In each cast with the denture in place, three transversallines settled in the anterior, medial and posterior regions were demarcated, and in each line the space between the base and the cast was measured at 5 reference points (left and right sulcus depth, left and right ridge crest and midpalatal points). Two methods were used: A- interposition of an impression material (silicone rubber) and measurement of its thickness using a modified caliper; B- after fixation of the bases into the casts with adhesive, they were transversely seccioned at the reference lines and read in a linear comparator microscope. AlI data were analysed by ANOV A and Tukey test (5%), and it was concluded that the analyses done by using microscope were more accurate than the interposition of the impression material, revealing for the former method, statistically significant low values, considering methods, regions and points studied


resinas acrilicas dentarias adaptação protese dentaria completa

Documentos Relacionados