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Practice‐based clinical evaluation of metal–ceramic and zirconia molar crowns: 3‐year results
Author(s) -
Rinke S.,
Schäfer S.,
Lange K.,
Gersdorff N.,
Roediger M.
Publication year - 2013
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/joor.12018
Subject(s) - cubic zirconia , materials science , dentistry , crown (dentistry) , ceramic , molar , medicine , composite material
Summary This practice‐based study evaluates the clinical performance of conventionally luted metal–ceramic and zirconia molar crowns fabricated with pronounced anatomical core design and a prolonged cooling period of the veneering porcelain. Fifty‐three patients were treated from 07/2008 until 07/2009 with either metal–ceramic crowns (MCC) (high‐noble alloy + low‐fusing porcelain) or zirconia crowns (Cercon System, DeguDent, Germany). Forty‐nine patients (30 women/19 men) with 100 restorations (metal–ceramic: 48/zirconia: 52, mean observational period: 36·5 ± 6 months) participated in a clinical follow‐up examination and were included in the study. Time‐dependent survival ( in situ criteria), success (event‐free restorations) and chipping rates (defects of the veneering ceramics) were calculated according to the Kaplan–Meier method and analysed in relation to the crown fabrication technique, using a Cox regression model ( P < 0·05). Three complete failures (metal–ceramic: 1, zirconia: 2) were recorded (survival rate after 3 years: metal–ceramic: 97·6%, zirconia: 95·2%). Of the metal–ceramic restorations, 90·9% remained event‐free (two ceramic fractures, one endodontic treatment), whereas the success rate for the zirconia was 86·8% (two ceramic fractures, one endodontic treatment, one secondary caries). No significant differences in survival ( P = 0·53), success ( P = 0·49) and ceramic fracture rates ( P = 0·57) were detected. The combination of a pronounced anatomical core design and a modified firing of the veneering porcelain for the fabrication of zirconia molar crowns resulted in a 3‐year survival, success and chipping rate comparable to MCC .