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The survival of Class V restorations in general dental practice: part 3, five-year survival
D Stewardson1, S Creanor, P Thornley
1Conservative Dentistry, University of Birmingham School of Dentistry, St Chads Queensway, Birmingham, B4 6NN. d.a.stewardson@bham.ac.uk
Objective:
To evaluate the survival over five years of Class V restorations placed by UK general practitioners, and to identify factors associated with increased longevity.
Design:
Prospective longitudinal cohort multi-centre study.
Setting:
UK general dental practices.
Materials And Method:
Ten general dental practitioners each placed 100 Class V restorations of varying sizes, using a range of materials and recorded selected clinical information at placement and recall visits. After five years the data were analysed using the Kaplan-Meier method, log-rank tests and Cox regressions models to identify significant associations between the time to restoration failure and different clinical factors.
Results:
After five years 275/989 restorations had failed (27.8%), with 116 (11.7%) lost to follow-up. Cox regression analysis identified that, in combination, the practitioner, patient age, cavity size, moisture contamination and cavity preparation were found to influence the survival of the restorations.
Conclusions:
At least 60.5% of the restorations survived for five years. The time to failure of Class V restorations placed by this group of dentists was reduced in association with the individual practitioner, smaller cavities, glass ionomer restorations, cavities which had not been prepared with a bur, moisture contamination, increasing patient age, cavities confined to dentine and non-carious cavities.
