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Effect of Core Material and Restoration Design on Strength of Endodontically Treated Bovine Teeth: A Laboratory Study
Author(s) -
Hinckfuss Simon,
Wilson Peter R.
Publication year - 2008
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2008.00324.x
Subject(s) - ferrule , crown (dentistry) , dentistry , amalgam (chemistry) , post and core , materials science , core (optical fiber) , orthodontics , medicine , composite material , chemistry , engineering , telecommunications , electrode , optical fiber
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.