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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. |
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