Longevity of posterior restorations

From 1963 to 1993, 890 patients were treated with 3518 cast gold restorations by students and postgraduate dentists. The longevity of these restorations was studied retrospectively using the patient files. Longevity was calculated using the method described by Kaplan and Meier. After the observation period, 111 (3.2%) of the examined restorations were not in place anymore. The most frequent reasons for failure were caries (33.7%), lack of retention (32.7%), endodontic treatment (29.6%), insufficient marginal adaptation (3.1%) and extraction (1%). The cumulative survival rate and a 95% interval of confidence was calculated for all restorations and for each of the locations and surfaces included in the trial. The 10-year survival rate for occlusal inlays was, 76.1% (12.1) for MO inlays 88.3% (4.2), for DO inlays 83.4% (4.6), for MOD inlays 87.5% (2.4), for partial crowns 86.1% (3.3) and 85.7% (1.7) for all restorations. Based on the statistical method used, the cast gold restorations demonstrated satisfactory longevity results.

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Long-term survival of cast-gold inlays in a specialized dental practice

Erpenstein¹,

Kerschbaum

Halfin

2001

Clin Oral Invest

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At a dental office in Münster, Germany, the majority of gold inlays incorporated between July 1969 and August 1999 (n=2,071) in 531 patients were checked with reference to the dental records and assessed retrospectively to determine their longevity. One hundred seventy-five gold inlays were rated as failures (no longer in situ); 10 abutment teeth were extracted. The 20-year Kaplan-Meier survival rate for restoration-bearing teeth was 98.9%, and the 25-year rate for all gold inlays 73.4% (+/- 4.0%; 95% confidence interval respectively in brackets). Gold inlays inserted in maxillary teeth had significantly better probabilities of survival after this period than those inserted in lower teeth (P=0.0002). Based on the number of surfaces involved, 52.0% (+/- 45.3) of one-surface inlays, 64.3 (+/- 7.5) of two-surface inlays, 75.8% (+/- 7.6) of three-surface inlays, and 84.8% (+/- 5.4) of inlays with more than three surfaces were still in situ after 25 years.

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Longevity of posterior restorations

Cited by 16 publications

References 14 publications

Flexural strength of composites: influences of polyethylene fiber reinforcement and type of composite

Flexural strength of composites: influences of polyethylene fiber reinforcement and type of composite

Longevity of cast gold inlays and partial crowns - a retrospective study at a dental school clinic

Long-term survival of cast-gold inlays in a specialized dental practice

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