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The life expectancy of dental restorations placed within the General Dental Services in England and Wales

Lucarotti, Peter Stephen Kerr (2003)
Ph.D. thesis, University of Birmingham.

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This study measured the distribution of the interval between placement and next intervention on the same tooth for direct restorations of teeth in the General Dental Services of the NHS in England and Wales between January 1991 and December 2002. Three different sets of treatment data covering the period were used, involving over 1.3 million restorations. Standard and modified Kaplan-Meier, and three different cross-sectional techniques were used to estimate empirical survival curves, and Cox-regression was used to model the relationship with risk factors associated with the dentist, the patient, geographical location, time, tooth position and type of restoration and cavity. Overall, median survival was slightly more than eight years from placement to re-intervention. The rates of survival without intervention after one year, five years and ten years were, respectively, 89%, 62% and 46%. Key risk factors associated with survival were type of cavity, tooth position, patient age, patient treatment history and patient attendance history. The underlying baseline function of the Cox-regression analysis was closely modelled by both a Weibull and a cubic function.

The robustness of the findings was demonstrated by a full replication of the eleven-year analysis using a completely separate fourth sample from the DPB’s data archive.

Type of Work:Ph.D. thesis.
Supervisor(s):Burke, Trevor and Holder, Roger
School/Faculty:Colleges (2008 onwards) > College of Medical & Dental Sciences
Department:School of Dentistry
Additional Information:

The appendix consists of a set of HTML documents arranged within sub-folders within the accompanying CD-ROM. These documents have been produced as output from custom-written programs using the statistical analysis package SPSS. The disk also contains the complete text of this thesis, in the form of a Microsoft Word master document with sub-documents.

Subjects:RK Dentistry
Institution:University of Birmingham
ID Code:3777
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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