Abstrait

Comparative Study in vitro of Acrylic Resins in Fixed Provisional Prostheses

Antonio de Jesús Enríquez Esqueda, María Teresa Zermeño Loredo, Juan Manuel Guizar Mendoza and Luis Antonio Fandiño Torres

Introduction: Materials for temporary fixed prostheses offer different physical properties in terms of hardness, susceptibility to pigmentation and exothermic reaction during their polymerization. Objective: To conduct an in vitro comparison of the properties of five acrylic resins for the preparation of fixed provisional prostheses. Methods: In this study was prepared 30 samples of three different acrylics and five different brands (bis-acryl, auto-cured polymethyl methacrylate and heat-cured polymethyl methacrylate - PMMA), which were tested for exothermic reaction during polymerization, susceptibility to pigmentation and Rockwell hardness. Results: PMMA had a greater exothermic reaction (p<0.0001); bis-acryl showed an increased susceptibility to pigmentation (p<0.0001) and heat-cured acrylic was the material with greater resistance (p<0.0001). Conclusion: Auto-cured acrylics are suggested for short periods and non-vital teeth treatments. Heat-cured acrylics are indicated for long-term treatments in long gaps and bis-acryl is indicated for short-term treatments.