title: Outcome of direct restorations placed within the general dental services in England and Wales (Part 2): variation by patients' characteristics.
abstract: OBJECTIVE
  It is the purpose of this paper to investigate the outcome of direct-placement restorations provided within the General Dental Services in England and Wales, and to identify the patient factors which may affect this using a database derived from patient treatment data at the Dental Practice Board.
  
  
  METHODS
  For this work, survival of a restoration was considered to be the time between the date of completion of the course of treatment in which it was placed and the date of acceptance of the course of treatment when the next tooth-specific treatment was carried out on the same tooth. A modified version of Kaplan-Meier statistical methodology was used to plot survival curves for restorations in different subgroups of patients within the population of patients for whom data were available.
  
  
  RESULTS
  The results indicated that patients' gender was of little significance in the long-term survival of restorations, but patient age had a significant effect, with the restorations of older patients surviving less well than those of younger patients (P<0.001). The charge-paying status of the patient had a statistically significant but small effect (P<0.001), with survival for charge-payers being slightly higher throughout the observation period. There was a strong relationship between attendance frequency and survival time, with restorations of more frequent attenders performing less well than those of less frequent attenders (P<0.001).
  
  
  CONCLUSIONS
  Patient factors such as age, charge-paying status, interval between courses of treatment, continuity of care by one dentist, and annual gross fees incurred, have all been found to influence the survival of directly placed restorations.
authors.affiliation: Primary Dental Care Research Group, University of Birmingham School of Dentistry, St Chad's Queensway, Birmingham B4 6NN, UK. f.j.t.burke@bham.ac.uk
authors.forename: F J T
authors.initials: FJ
authors.lastname: Burke
authors.forename: P S K
authors.initials: PS
authors.lastname: Lucarotti
authors.forename: R L
authors.initials: RL
authors.lastname: Holder
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D003793:Dental Restoration, Permanent / Q000191:economics / Q000706:statistics & numerical data; D004739:England; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D012959:Socioeconomic Factors; D016019:Survival Analysis; D013997:Time Factors; D014852:Wales