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Long‐term survival estimates of cast gold inlays and onlays with their analysis of failures
Author(s) -
Studer S. P.,
Wettstein F.,
Lehner C.,
Zullo T. G.,
Schärer P.
Publication year - 2000
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 - 10.1046/j.1365-2842.2000.00540.x
Subject(s) - inlay , dentistry , gold alloys , medicine , gold standard (test) , survival rate , survival analysis , orthodontics , surgery , materials science , composite material , alloy
The aim of the present study was to assess the clinical behaviour of cast gold restorations with respect to define a gold control against current and future ceramic and composite restorations. The study sample included 50 patients with 303 cast gold restorations. All restorations were cemented with a non‐adhesive technique. A total of 303 restorations were evaluated clinically and radiographically using modified United States Public Health Service criteria. Restorations recorded as having an A‐ or a B‐rating were defined as successful. Of the 303 restorations, 42 were judged as failures, which resulted in a failure rate of 13·8% for a mean observation time (±s.d.) of 18·7 (±9·5) years. The estimated Kaplan–Meier survival rates (±s.e.) were 96·1% (±1·1%) at 10 years, 87·0% (±2·2%) at 20 years and 73·5% (±5·4%) at 30 years. In total, biological reasons were counted 25 times in comparison to 17 technical reasons for those 42 failed cast gold restorations, with 17 secondary caries (40%) as the most common biological reason and with 13 retention losses (31%) as the most common technical reason. The endodontically treated tooth was exclusively identified as a risk factor. The restoration type (inlay versus onlay) did not influence the survival rate.