Categories

Volume 7 Issue 11 (November, 2019)

Original Articles

Flexural strength of provisional crown and fixed partial denture resins
Archana Jalheria, Purushotam Kumar, G. S. Chandu, Ambika Shrivastava, Faisal Khan, Shweta Meshram

Introduction. 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 1 methacrylate-based resins and 1 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 24 HOURS and 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. Results. Mean flexural strengths ranged from 57.12 to 125 MPa. The group with the highest strengths consisted of 1 bis- acryl materials. 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. Key words: Flexural strength, provisional crown, fixed partial denture resins.

 
Html View | Download PDF | Current Issue