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Year : 2015  |  Volume : 12  |  Issue : 4  |  Page : 301-306

Effect of the processing cycle on dimensional changes of heat-polymerized denture base resins

1 Department of Prosthodontics, Dental School, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
2 Torabinejad Dental Research Center and Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
3 Dental Materials Research Center and Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran

Correspondence Address:
Farahnaz Nejatidanesh
#400-Sheikhsadoogh Shomali St. Sheikhsadoogh Cross Road, Isfahan 8174673461
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Source of Support: This study was supported by Isfahan University of Medical Sciences Research Grant #83406., Conflict of Interest: None

DOI: 10.4103/1735-3327.161423

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Background: The second processing cycle for adding the artificial 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 first 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 significant 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 significantly affected the measured distances (P < 0.05). Meliodent acrylic resin was not significantly influenced 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 significant based on the acrylic resin used.

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