Longevity of gold restorations in posterior teeth: A retrospective study up to 10-years

Objective: In this retrospective clinical study, we investigated the long-term survival and success of indirect gold restorations, placed by undergraduate students.Material and Methods: The study included 72 gold restorations in 45 patients, placed in a five-year period between 2009 and 2013. Two experienced dentists performed the evaluation following the FDI criteria after 5 to 10 years. Kaplan-Meier test was used for longevity analysis of success and survival. Data were tested for normality with Shapiro-Wilk test. Cox regression analysis, with significance level appointed at p <= .05, was performed using success and survival of restorations as dependent variables. Annual failure rates (AFRs) were calculated.Results: Overall, 72 indirect gold restorations prepared in posterior teeth were assessed, with an observation time from 63 months to 117 months. The mean service time was 88.1 months and the median 87 months. No failures, but 2 repairs, were observed during the first five years. From 5 to 10 years 1 replacement and 1 more repair occurred. The survival and success rates of gold restorations were calculated at 9 years with 98.6% and 91%, respectively. Restorations placed on premolars had higher survival and success rates compared to molars. Three cases were categorized as repairs: in two cases, a root canal treatment was needed and, in one other, an occlusal perforation of the restoration was observed.Conclusions: Posterior indirect gold restorations placed by dental undergraduate students showed a highly pre-dictable clinical performance in terms of success and survival. These results are comparable with survival rates reported in literature for restorations cemented in general dental practices. Clinical significance: Casted gold restorations placed from dental students in an undergraduate setting show high survival rates, similar to professional dentists.