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ORIGINAL ARTICLE
Year : 2018  |  Volume : 21  |  Issue : 12  |  Page : 1585-1589

Effect of different framework materials of resin-bonded bridges on load to fracture values and stress distribution


1 Department of Prosthodontics, Kırıkkale University Faculty of Dentistry, Kırıkkale, Turkey
2 Vocational School of Health Services, Kırıkkale University, Kırıkkale, Turkey

Correspondence Address:
Dr. Hamiyet Gungor
Department of Prosthodontics, Faculty of Dentistry, Kirikkale University, Yahsihan-kirikkale
Turkey
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/njcp.njcp_281_18

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Purpose: The aim of this study was to compare in vitro fracture strengths (FSs) of metal- and fiber-reinforced frameworks of resin-bonded bridges and to evaluate stress distribution with finite element analysis (FEA). Materials and Methods: Totally 80 extracted maxillary central and maxillary canine teeth were used for in vitro part of this study as two groups; metal-reinforced framework (n = 20) [(metal-supported resin-bonded bridge (MR-RB)] and fiber-reinforced frameworks (n = 20) [fiber-reinforced resin-bonded bridge (FR-RB) were prepared for three unit resin-bonded bridges. All bridges were loaded from lateral pontic at 1 mm/min crosshead speed and fracture values were recorded. Mann–Whitney U-test was used for statistical analysis, and fracture patterns were evaluated visually. FEA was carried out in the second part of the study, and stress distribution of MR-RB and FR-RB structures was analyzed using one of the models from in vitro specimens as main model. Results: The mean FSs of MR-RB and FR-RB were 637.47 ± 151.91 N and 224.86 ± 80.97 N, respectively. Fiber-reinforced specimens were found to distribute stress more homogeneous and connectors in each framework were the regions where stress concentrated mostly. Conclusion: In vitro FSs of MR-RB and the stress concentration of the point that the forces were applied were higher as compared to other parts of the restoration. Furthermore, in contrast to FR-RB specimens, retainer tooth fractures were observed in MR-RB specimens.


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