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Comparative adaptation accuracy of different injection molded resin denture base materials: A scanning electron microscope study

 Department of Prosthodontics, Meghna Institute of Dental Sciences, Nizamabad, Telangana, India

Correspondence Address:
Khaja Yousuf Sharif,
Department of Prosthodontics, Meghna Institute of Dental Sciences, Nizamabad, Telangana
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0976-6944.187445

Background: Polymethyl methacrylate (PMMA) resin has been the most commonly used material for denture bases, despite its popularity, PMMA resin is far from ideal. Polymerization shrinkage and release of thermal stresses are the major disadvantages exhibited by the material. In an attempt to overcome dimensional in accuracies of PMMA resin, new thermoplastic resins and alternative processing techniques have been developed. Purpose: The purpose of this study was to evaluate and compare the adaption accuracy of two commercially available injection molded resin (Brecrystal and Ivoclar). Materials and Methods: A total of 14 accurate denture bases with the same dimension were fabricated, seven denture bases were made using Ivoclar injection molding technique and seven dentures were processed using injection molding technique (Crystal, Bredent, Germany). The adaptation accuracy was examined using scanning electron microscope. The gap between the resin base and stone cast was measured at canine region and posterior palatal area at five points at five points, corresponding to the right and left residual ridge crests, the midline, and the right and left marginal limits of the flanges. Results: The least total gap score measured was for Brecrystal followed by Ivoclar. It has been found that a highly significant correlation was observed for Section A, whereas Section B showed a significant correlation for Ivoclar denture base material. For Bredent, a statistically significant correlation was found for Section B, whereas Section A showed an insignificant correlation. Conclusion: Brecrystal injection molded PMMA resin is superior in terms of dimensional accuracy compared to Ivoclar injection molded PMMA resin.

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