Factors Associated with the Longevity of Restorations in Posterior Teeth

  • AOYAMA Takanori
    Department of Preventive Dentistry, Division of Oral Science, Hokkaido University Graduate School of Dental Medicine
  • AIDA Jun
    Department of Preventive Dentistry, Division of Oral Science, Hokkaido University Graduate School of Dental Medicine
  • TAKEHARA Junji
    Department of Preventive Dentistry, Division of Oral Science, Hokkaido University Graduate School of Dental Medicine
  • MORITA Manabu
    Department of Preventive Dentistry, Division of Oral Science, Hokkaido University Graduate School of Dental Medicine

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Other Title
  • 臼歯部修復物の生存期間に関連する要因
  • キュウシブ シュウフクブツ ノ セイゾン キカン ニ カンレンスル ヨウイン

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Abstract

There have been few cohort-based studies on the failure of dental restorations and their length of service in private Japanese practices. The purpose of this study was to determine factors associated with the longevity of dental restorations in posterior teeth. The treatment records of ten dentists working in one metropolitan area of Japan between 1991 and 2005 were selected. The survival curves of various types of restorations placed in 649 posterior teeth of 95 adult patients (33.3±14.2 years old) were depicted using the Kaplan-Meier method. Factors associated with the longevity of dental restorations were evaluated using multivariate Cox proportional hazards regression analysis. Reasons for the failure of dental restorations were also recorded when dentists decided to replace them. The mean survival time for composite resins, metal inlays, metal onlays, metal crowns, and metal bridges were 3,532, 3,804, 3,332, 3,276, and 2,557 days, respectively. The survival probability of metal bridges was lower than of any other restorations (p<0.01). Secondary caries presence was the most frequent reason for the replacement of composite resins, metal inlays, and metal onlays. Metal crowns were replaced mostly for endodontic reasons. There was no evidence that the life span of dental restorations depended on age, sex, or tooth type. However, the longevity was significantly shorter in subjects diagnosed with Eichner Index B1 (p<0.05), B2 (p<0.001), and B3 (p<0.01) compared to those with Eichner Index A. These results suggest that the longevity of dental restorations placed in posterior teeth was associated with the occlusal status.

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