Effect of the processing cycle on dimensional changes of heat-polymerized denture base resins
Message:
Abstract:
Background
The second processing cycle for adding the artifi cial teeth to heat-polymerized acrylic resin denture bases may result in dimensional changes of the denture bases. The aim of this study was to evaluate the dimensional changes of the heat-polymerized acrylic resin denture bases with one and two-cycle processing methods.
Materials And Methods
A metal edentulous maxillary arch was used for making 40 stone casts. Maxillary complete dentures were made with heat-polymerized acrylic resins (Meliodent and Acropars) with one and two stage processing methods (n = 10 for each group). Linear dimensional changes in anteroposterior and mediolateral distances and vertical changes in the fi rst molar region were measured following each processing cycle, using a digital caliper. Mean percentage of the dimensional changes were subjected to two-way analysis of variance and Tukey honest signifi cant difference tests (α = 0.05).
Results
Postpolymerization contraction occurred in both anteroposterior and mediolateral directions in all studied groups; however, the vertical dimension was increased. Acropars acrylic resin showed the highest dimensional changes and the second processing cycle signifi cantly affected the measured distances (P < 0.05). Meliodent acrylic resin was not signifi cantly infl uenced by the processing method.
Conclusion
Reheating of the acrylic resin denture bases for the addition of denture teeth result in linear dimensional changes, which can be clinically signifi cant based on the acrylic resin used.
Language:
English
Published:
Dental Research Journal, Volume:12 Issue: 4, Jul 2015
Page:
301
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