Abstract
It is the aim of this paper to present data on the survival of restorations in canine teeth by analysis of the time to re-intervention on the restorations and time to extraction of the restored tooth, and to discuss the factors which may influence this. A data set was established, consisting of General Dental Services (GDS) patients, this being obtained from all records for adults (aged 18 or over at date of acceptance) in the GDS of England and Wales between 1990 and 2006. The data consist of items obtained from the payment claims submitted by GDS dentists to the Dental Practice Board (DPB) in Eastbourne, Sussex, UK. This study examined the recorded intervals between placing a restoration in a canine tooth and re-intervention on the tooth, and the time to extraction of the restored tooth. Data for more than three million different patients and more than 25 million courses of treatment were included in the analysis. Included were all records for adults (aged 18 or over at date of acceptance). Overall, 1,232,052 restorations involving canine teeth were included in the analysis. With regard to time to re-intervention, 33% of restorations had survived at 15 years, and with regard to time to extraction of the restored tooth, cumulative survival was 78% at 15 years. Veneers and crowns performed best in terms of time to re-intervention, but crowns performed worst when time to extraction was analysed. Overall, crowns and porcelain veneers placed on canine teeth perform best to re-intervention after 15 years, but crowns perform worst when the time to extraction of the restored tooth is examined and veneers perform best, with a 20 percentage point difference in cumulative survival at fifteen years between crowns and the best performing restoration in the under-40 year age group, this effect being accentuated in the over-40 year age group. Other factors influencing restoration longevity in canine teeth include: patient age, dentist age and the patient's annual need for dental treatment.
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