A comparative evaluation of the dimensional accuracy of heat polymerized acrylic resin denture base clamped by the conventional method and by new-press technique and cured by long curing cycle: an in vitro study

The aim of this study is to evaluate the dimensional accuracy of heat polymerized acrylic resin denture base clamped by the conventional method and by new-press technique and cured by long curing cycle. In this study, a total of 60 standardized maxillary record bases were fabricated with seven reference points as follows: Point A: Incisive papilla, Point B and C: Canine region on either side Point E and G: Midpoint of tuberosities on either side Point F: Midpoint of the line joining the two tuberosities Point D: Midpoint between the line joining A and F. Ten maxillary record bases were fabricated by conventional clamping method and cured by long curing cycle. GROUP A': Ten maxillary record bases were fabricated by New Press or RS tension clamping method and cured by long curing cycle. The distances between the reference points, i.e. A-B, A-C, A-D, D-F, B-E, C-G, E-F, F-G, B-D, D-G, C-D, D-E of all three thermoplastic denture base plates were measured and recorded with the help of travelling microscope and were used for comparison with the measured and recorded readings of processed acrylic denture bases. The data obtained was analyzed by using the one-way analysis of variance and HSD Multiple Comparison Test. The overall results of the study indicate that among all the denture bases cured by the two clamping systems and the long curing cycle, group A' were the most dimensionally stable, followed by control group A. The study concluded that the denture bases fabricated by the New Press method using the long curing cycle would produce the most dimensionally stable denture bases.