title: Retrospective study of the 10-year clinical performance of direct resin composite restorations placed with the acid-etch technique.
abstract: OBJECTIVE
  To assess the 10-year clinical performance of resin composite restorations placed using the acid-etch technique.
  
  
  METHODS
  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).
  
  
  RESULTS
  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).
  
  
  CONCLUSIONS
  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.
authors.affiliation: Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, Japan. nikaido.poe@tmd.ac.jp
authors.forename: Toru
authors.initials: T
authors.lastname: Nikaido
authors.forename: Tsunehiko
authors.initials: T
authors.lastname: Takada
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Kitasako
authors.forename: Miwako
authors.initials: M
authors.lastname: Ogata
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Shimada
authors.forename: Takako
authors.initials: T
authors.lastname: Yoshikawa
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Nakajima
authors.forename: Masayuki
authors.initials: M
authors.lastname: Otsuki
authors.forename: Junji
authors.initials: J
authors.lastname: Tagami
authors.forename: Michael F
authors.initials: MF
authors.lastname: Burrow
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D000180:Acrylic Resins / Q000737:chemistry*; D000328:Adult; D000368:Aged; D016009:Chi-Square Distribution; D003188:Composite Resins / Q000737:chemistry*; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011140:Polyurethanes / Q000737:chemistry*; D012189:Retrospective Studies; D016019:Survival Analysis
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes