Comparative analysis of the mismatch of two types of transfer bases for full dentures

Abstract

The adjustment of transfer bases to the oral tissues plays a crucial role in the construction of a complete prosthesis, ensuring that the rehabilitation fulfills its functions in a satisfactory way. The bases, generally made of self-curing acrylic resin (RAAC), undergo deformation from their manufacture to their use in the mouth. Alternative materials such as polyvinyl chloride (PVC) can be used, although few dental schools include it in their protocols. The purpose of this study was to compare the mismatch of RAAC transfer bases with those of PVC, for which, 20 RAAC and 20 PVC bases were built on 40 plaster models of edentulous typodons, according to the protocol of the Faculty of Dentistry. from the Evangelical University of El Salvador. The mismatch was measured in the central area of ​​the post-dam at 24, 72 and 168 hours of fabrication, scanning the models and their bases. The data collected from STL images were analyzed with the SPSS 25 program. The T test for independent samples with a value of p = 0.002 showed statistically significant differences, finding a greater mismatch in the RAAC bases of 0.47120 mms. compared with 0.38288 in PVC, rejecting the null hypothesis of mismatch equality. When comparing groups by time period, the 24-hour group did not have statistically significant differences, not so in 72 and 168 hours, whose differences are significant with greater mismatch in the RAAC bases.