To investigate the longevity and reasons for failure of posterior Class II gold inlays among a group of Norwegian adults.
A cohort of 138 patients (81 male and 57 female) regularly attending a general practice for regular check-up were examined by one clinician (GS) in 2016. The patients had a total of 391 posterior Class II gold inlays placed in the period 1970 to 2015. The inlays were categorized as acceptable or failed. Information on the longevity and reasons for failures was collected from the patient records. Reasons for failure were classified as either “secondary caries”, “fracture”, “lost inlay” or “other”. Participation was voluntary and no compensation was given. The implementation was approved by the Regional Committee for Medical Research Ethics in Norway (ID: 2015/1324).
The mean age of the patients at placement was 50.8 years (SD: 12.7yr). Most gold inlays were placed in molars (85.9%) and 14.1% were placed in premolars; 49.4% of the inlays were in the maxilla and the 50.6% in the mandibula. Average length of follow-up was 11.6 years (range: 1-46 years, SD: 7.9); 93.5% were classified as successful and 6.5% as failed. Reasons for failure were secondary caries (41.3%), lost inlay (25.4%), fractures (23.8%) and other (9.5%). Mean annual failure rate (AFR) of the inlays was 0.57%.
The present retrospective clinical study demonstrated a low annual failure rate of Class II gold inlays. Thus, gold inlays can still be considered as a good treatment option in posterior teeth for certain patients. Summary of the abstract: A low annual failure rate of Class II gold inlays among Norwegian patients was demonstrated.
A Retrospective Clinical Study on the Longevity of Gold Inlays
A. MULIC a), G. SVENDSEN b), S. E. KOPPERUD a)
a) Nordic Institute of Dental Materials (NIOM), Oslo, Norway
b) Department of Cariology, Faculty of dentistry, University of Oslo, Oslo, Norway