IngentaConnect Effect of Core Material and Restoration Design on Strength of End...

Abstract:

Purpose: The purpose of this study was to evaluate the fracture resistance of bovine teeth restored with one-piece cast core/crowns and no ferrule, compared to teeth restored with amalgam cores and full coverage crowns, with and without a dentine ferrule.

Materials and Method: Thirty bovine incisors were selected and modified to ensure all teeth had axial dentine walls of similar size. The teeth were then randomly allocated to one of the three groups: control group restored with amalgam core and cast crown without ferrule; ferrule group restored with amalgam core and cast crown with a 2-mm dentine ferrule; one-piece group restored with one-piece cast core/crown without ferrule. Each tooth was loaded to the point of fracture.

Results: The mean load resisted by the control group, the ferrule group, and the one-piece group were 1092.5, 1843.5, and 1463.1 N, respectively. The mean load resisted by the ferrule group was significantly greater than the control group (p < 0.001) and the one-piece cast core/crown group (p= 0.04). The mean load resisted by the one-piece cast core/crown group was significantly greater than the control group (p= 0.04).

Conclusions: The maximum load resistance was significantly enhanced by a 2-mm ferrule compared with teeth with no ferrule and teeth restored with one-piece cast core/crowns. Teeth restored with one-piece cast core/crowns were significantly more resistant to loading than teeth restored with amalgam cores and crowns without a ferrule.

Keywords: Load; endodontics; molar; foundation

Document Type: Research article

DOI: 10.1111/j.1532-849X.2008.00324.x

Affiliations: 1: Candidate for Doctor of Clinical Dentistry, School of Dental Science, University of Melbourne, Victoria, Australia 2: Professor, School of Dentistry and Oral Health, La Trobe University, Bendigo, Victoria, Australia

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Effect of Core Material and Restoration Design on Strength of Endodontically Treated Bovine Teeth: A Laboratory Study