1-year clinical evaluation of Compoglass and Fuji II LC in cervical erosion abfraction lesions

Purpose: This study was undertaken to compare the clinical performance of a polyacid-modified resin-based composite and a resin-modified glass-ionomer restorative material over 1 year. Materials and Methods: Thirty-four pairs of restorations of Compoglass (C) and Fuji II LC (F) were placed in 31 pat ients, with no patient receiving more than two pairs, and with materials as signed at random within the pairs. Caries-free cervical erosion/abfraction lesions of the facial surface were restored without tooth preparation accor ding to manufacturers' instructions, except that tooth structure to be rest ored was etched with 37% phosphoric acid prior to placement of Compoglass. Restorations were clinically evaluated by two blinded examiners at baseline , 6 months, and 1 year, using modified Ryge/USPHS criteria. Restorations re ceiving a score of "Charlie" in either retention or secondary caries were c lassified as failed restorations. The incidence of failures was statistical ly analyzed as a pairwise comparison, using an exact binomial test. Results : Thirty-one pairs of restorations were available for recall at 1 year. The percentage of Alfa scores for each material in each category were: Retenti on (C = 84%, F = 100%), Color match (C = 81%, F = 100%), Marginal discolora tion (C = 78%, F = 97%), Secondary caries (C = 88%, F = 100%), Anatomic for m (C = 92%, F = 100%), and Marginal adaptation (C = 26%, F = 46%). Except f or the failed restorations, no other Charlie scores were assigned. A signif icant difference in the incidence of failed restorations was found between the materials (P = 0.01).