Retrospective study of the 10-year clinical performance of direct resin composite restorations placed with the acid-etch technique

To assess the 10-year clinical performance of resin composite restorations placed using the acid-etch technique.

Clinical evaluation of 58 resin composite restorations was performed by 9 operators of the Operative Dentistry Clinic of the Dental Hospital, Tokyo Medical and Dental University. Conservative preparations had been made and a total-etch adhesive system used for the resin composite restorations, which were placed in 1992 in the Operative Dentistry Clinic. Restorations were scored using the following scale: Alfa--good; Bravo--clinically acceptable; Charlie--clinically unacceptable; Delta-already replaced. The scores were analyzed using the chi-square test and the expected cell frequency (P = .05).

The 58 restorations from 26 patients (13 men and 13 women) were identified in the treatment records and analyzed. Twenty-two restorations (37.9%) presented Alfa scores and 17 restorations (29.3%) were clinically acceptable (Bravo scores), while 3 restorations (5.2%) received Charlie scores and 16 restorations (27.6%) had already been replaced (Delta scores). The descending ranking of longevity by restoration type was Class 5 >Class 3 >Class 2 >Class 1 >Class 4 (P = .05).

Of the restorations evaluated, 67.2% were ser-viceable (combined Alfa and Bravo scores) 10 years after placement. Longevity was significantly influenced by cavity type.