Saucer-shaped cavity preparations for posterior approximal resin composite restorations: observations up to 10 years.
OBJECTIVE
This clinical trial aimed at studying the long-term performance in routine clinical practice of saucer-shaped Class II resin composite restorations.


METHODS
Fifty-one preparations were completed and filled with either of two light-cured posterior composites by seven dentists of the Public Dental Service. The restorations were evaluated annually, using the US Public Health Service criteria, bitewing radiographs, and dies based on replica impressions. At the final evaluation, the recall rate was 100%.


RESULTS
After a mean of 7.2 +/- 1.3 years of service (censored maximum of 9.6 years), 70% of the restorations were acceptable for continued use. Caries and technical deficiencies were the main causes of failure.


CONCLUSIONS
The saucer configuration, by respecting and utilizing inherent properties of the resin composites, spares sound dentin and is preferable to the box preparation.
Nordbø
H
H
Department of Preclinical Techniques and Material Sciences, Dental Faculty, University of Oslo, Norway. hakonn@amalgam.uio.no
Leirskar
J
J
von der Fehr
F R
FR
D000293:Adolescent; D001641:Bicuspid; D017438:Bisphenol A-Glycidyl Methacrylate; D016009:Chi-Square Distribution; D003188:Composite Resins; D003731:Dental Caries / Q000628:therapy*; D003737:Dental Cavity Preparation; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000379:methods*; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008963:Molar; D011140:Polyurethanes; D016896:Treatment Outcome; D014520:Urethane
D003188:Composite Resins; D011140:Polyurethanes; C056413:Occlusin; D014520:Urethane; D017438:Bisphenol A-Glycidyl Methacrylate; C046503:formula F 70