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The International Journal of Prosthodontics
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Int J Prosthodont 28 (2015), No. 4     28. July 2015
Int J Prosthodont 28 (2015), No. 4  (28.07.2015)

Page 357-359, doi:10.11607/ijp.4191, PubMed:26218016


The Effects of Margin Curvature on Load at Fracture of Ceramic Crowns
Øilo, Marit / Kvam, Ketil / Reisegg, Kjetil / Gjerdet, Nils Roar
Purpose: Despite the high fracture strength of modern dental core ceramics, fractures are a common cause of clinical failures. The aim of this study was to use a clinically relevant test method to evaluate the effect of the curvature of the cervical crown margins on load at fracture.
Materials and Methods: Thirty zirconia crowns and 30 glass-ceramic crowns were produced for three premolar preparations with variation in the approximal crown margin curvature: low curvature (r = 12 mm), moderate curvature (r = 2.5 mm), and high curvature (r = 1.5). The crowns were loaded until fracture with a method that mimics clinical fracture modes.
Results: Statistically significant differences were found among both crown margin curvature and material groups (P < .001). Most fractures originated from pre-existing flaws.
Conclusion: A moderate to low curvature of the crown margins increases crown strength compared with a high curvature.