title: Two-year clinical evaluation of one-step self-etch systems in non-carious cervical lesions.
abstract: OBJECTIVE
  This randomized controlled clinical trial evaluated the 2-year clinical performance of S3 Bond (S3) and G-Bond (GB) in 108 non-carious cervical lesions.
  
  
  METHODS
  Twenty-three patients, 12 male and 11 female (mean age: 61.8 years, range: 30-79 years) regularly visiting the Nagasaki University Hospital of Medicine and Dentistry, participated in the study. Each patient received both materials randomly. All restorations (53 restorations for S3 and 55 restorations for GB) were placed by one dentist. The restorations were blindly evaluated by two examiners at baseline, 6 months, 1 and 2 years using modified USPHS criteria. The data were statistically analyzed using the Cochran Q test and Fisher's exact test.
  
  
  RESULTS
  One restoration of each material was lost during 2 years. The only minor clinical problem was the integrity of the enamel margin. Slight marginal staining occurred adjacent to 11 restorations of both S3 and GB. There was no significant difference in the clinical performance between S3 and GB for each variable.
  
  
  CONCLUSIONS
  Under the protocol used in this study, S3 and GB have demonstrated an acceptable clinical performance up to 2 years.
authors.affiliation: Center for Clinical Education and Training, Nagasaki University Hospital of Medicine and Dentistry, 1-7-1, Sakamoto, Nagasaki 852-8588, Japan.
authors.forename: Shisei
authors.initials: S
authors.lastname: Kubo
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Yokota
authors.forename: Haruka
authors.initials: H
authors.lastname: Yokota
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Hayashi
mesh_terms: D000328:Adult; D000368:Aged; D003116:Color; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D018772:Dental Marginal Adaptation; D017268:Dental Prosthesis Retention; D019554:Dental Restoration Wear; D003793:Dental Restoration, Permanent; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005260:Female; D005500:Follow-Up Studies; D005881:Gingiva / Q000473:pathology; D006801:Humans; D008297:Male; D008689:Methacrylates / Q000737:chemistry; D008875:Middle Aged; D011109:Polymethacrylic Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D013499:Surface Properties; D019237:Tooth Cervix / Q000473:pathology*; D014076:Tooth Diseases / Q000628:therapy*
chemical_list: C112828:Clearfil AP-X; C501417:Clearfil Flow FX; C505694:Clearfil S3 Bond; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C498353:G-Bond; D008689:Methacrylates; D011109:Polymethacrylic Acids; D019279:Resin Cements