Flexural strength of provisional crown and fixed partial denture resins

• Published in: The Journal of prosthetic dentistry Vol. 87; no. 2; pp. 225 - 228
• Main Authors: Haselton, Debra R., Diaz-Arnold, Ana M., Vargas, Marcos A.
• Format: Journal Article
• Language: English
• Published: United States Mosby, Inc 01.02.2002
• Subjects: Acrylic Resins; Analysis of Variance; Bisphenol A-Glycidyl Methacrylate; Compressive Strength; Crowns; Dental Restoration, Temporary; Dental Stress Analysis; Denture, Partial, Fixed; Denture, Partial, Temporary; Materials Testing; Pliability; Statistics, Nonparametric; Tensile Strength
• ISSN: 0022-3913; 1097-6841
• DOI: 10.1067/mpr.2002.121406

Statement of Problem. Provisional prostheses are subject to flexure under function. Selection of the appropriate material for their fabrication is difficult given the limited evidence-based information on the flexural strength of provisional resins. Purpose. This study compared the flexural strength of 5 methacrylate-based resins and 8 bis-acryl resins used to fabricate provisional crowns and fixed partial dentures. Material and Methods. Bar-type specimens were fabricated according to American National Standards Institute/American Dental Association specification 27. After being immersed in artificial saliva at 37°C for 10 days, the specimens were fractured under 3-point loading in a universal testing machine at a crosshead speed of 0.75 mm/min. Maximal loads to fracture in Newtons were recorded. Mean flexural strengths were calculated in MPa (n = 10 per group). Comparisons were made with analysis of variance and Duncan's multiple range test (P<.05). Results. Mean flexural strengths ranged from 56.2 to 123.6 MPa. There were 4 statistically similar groups. The group with the highest strengths consisted of 4 bis-acryl materials (Provipont, Integrity, Protemp 3 Garant, and Luxatemp). Conclusion. Within the limitations of this study, flexural strengths were material- rather than category-specific. Some, but not all, bis-acryl resins demonstrated significantly superior flexural strength over traditional methacrylate resins. (J Prosthet Dent 2002;87:225-8.)