title: Long-term survival estimates of cast gold inlays and onlays with their analysis of failures.
abstract: 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.
authors.affiliation: Department of Fixed and Removable Prosthodontics and Dental Materials, Center for Dental and Oral Medicine, University of Zürich, Switzerland. ststuder@zzmk.unizh.ch
authors.forename: S P
authors.initials: SP
authors.lastname: Studer
authors.forename: F
authors.initials: F
authors.lastname: Wettstein
authors.forename: C
authors.initials: C
authors.lastname: Lehner
authors.forename: T G
authors.initials: TG
authors.lastname: Zullo
authors.forename: P
authors.initials: P
authors.lastname: Schärer
mesh_terms: D016001:Confidence Intervals; D003735:Dental Casting Technique; D019232:Dental Restoration Failure; D005500:Follow-Up Studies; D006047:Gold Alloys / Q000627:therapeutic use*; D006801:Humans; D007284:Inlays / Q000706:statistics & numerical data*; D016016:Proportional Hazards Models; D016019:Survival Analysis; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D006047:Gold Alloys