title: Cervical compomer restorations: the role of cavity etching in a 48-month clinical evaluation.
abstract: Compomers are defined as polyacid-modified resin composites. They are supposed to combine the advantages of traditional glass-ionomer cements with resin composites. This study clinically evaluated a compomer in cervical cavities. Sixty cervical cavities in premolars and molars (24 with cervical caries and 36 with abrasions) randomly divided into two groups of 30 teeth (Group 1 and Group 2) were restored with Dyract (DeTrey-Dentsply, York, PA 17405-0872). The cavities of Group 2 were etched for 30 seconds with orthophosphoric acid before compomer application, while the Group 1 cavities received no treatment. All the restorations were evaluated every six months, up to 48 months: characteristics assessed according to USPHS-modified standards were retention, secondary caries, post-operative sensitivity, marginal adaptation and discoloration, color and wear. The Kaplan-Meier's survival analysis was performed. In both groups, retention was high without any statistically significant difference. No difference was found between the two groups for caries, post-operative sensitivity and wear--that all had a low incidence. Color was not perfectly matched, however, there was no statistically significant difference between the two groups. Marginal discoloration and marginal adaptation loss were significantly higher in non-etched group (p < 0.05). Clinically relevant failure required 17.2% of restorations in the non-etched group and 10% in the etched group to be replaced: this difference was not statistically significant. Dyract has an acceptable clinical behavior when used in cervical cavities. Its marginal adaptation is enhanced by etching.
authors.affiliation: Institute of Odontology and Stomatology, Department of Dental Materials, University of Trieste Erta dei pruni 22/1-34136 Trieste, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Di Lenarda
authors.forename: M
authors.initials: M
authors.lastname: Cadenaro
authors.forename: E
authors.initials: E
authors.lastname: De Stefano Dorigo
mesh_terms: D000134:Acid Etching, Dental; D000328:Adult; D000368:Aged; D001641:Bicuspid; D003116:Color; D020770:Compomers / Q000737:chemistry; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000379:methods; D018772:Dental Marginal Adaptation; D019232:Dental Restoration Failure; D019554:Dental Restoration Wear; D003793:Dental Restoration, Permanent; D003807:Dentin Sensitivity / Q000209:etiology; D005500:Follow-Up Studies; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D008875:Middle Aged; D008963:Molar; D010756:Phosphoric Acids / Q000737:chemistry; D017213:Root Caries / Q000628:therapy; D017640:Silicates / Q000737:chemistry; D016019:Survival Analysis; D014072:Tooth Abrasion / Q000628:therapy; D019237:Tooth Cervix / Q000473:pathology*
chemical_list: D020770:Compomers; C088486:Dyract; D008689:Methacrylates; D010756:Phosphoric Acids; D017640:Silicates; C030242:phosphoric acid