title: Two-year clinical performance of a two-step etch-and-rinse adhesive in non-carious cervical lesions: Influence of subject's age and dentin etching time.
abstract: OBJECTIVE
  The aim of this study was to evaluate the influence of the subject's age and dentin etching time on the clinical performance of a two-step etch-and-rinse adhesive in class V non-carious cervical lesions (NCCLs).
  
  
  METHODS
  Forty patients with NCCLs (classified as degrees 2 and 3 of dentin sclerosis) were enrolled in this study. The lesions were selected and assigned into two groups (n = 70/group) according to the subject's age: (G1) between 21-35 years old and (G2) between 40-54 years old. Each group was randomly divided into two subgroups (n = 35/group) according to dentin etching time using recommended application time (15 s) and an extended application time (30 s). A total of 140 restorations with XP Bond (Dentsply DeTrey, Germany) were placed. The composite resin Esthet X (Dentsply) was placed incrementally. All restorations were evaluated using the modified USPHS criteria. Data was analyzed by the McNemar and chi-square tests (p < 0.05).
  
  
  RESULTS
  At the end of 2 years, 132 restorations (94.2% recall rate) were evaluated. The 24-month retention rates (%) were 93.5 for G1(15), 97.1 for G1(30), 93.9 for G2(15), and 97.0 for G2(30). There were no statistical differences in the retention rates in each recall period among groups.
  
  
  CONCLUSIONS
  For the selected age groups, neither the subject's age nor the etching time had any influence on the clinical performance of XP Bond adhesive in NCCLs over a 24-month period.
  
  
  CONCLUSIONS
  The clinical effectiveness of the XP Bond was excellent after 2 years of clinical service. Long-term clinical evaluations are necessary to confirm this finding.
authors.affiliation: School of Dentistry, Department of Operative Dentistry, Federal University of Santa Catarina, Campus Universitário Reitor João David Ferreira Lima - Trindade, room 138, 88040-900, Florianópolis, Santa Catarina, Brazil. davidcsfarias@hotmail.com.
authors.forename: David Cardoso Sandes
authors.initials: DC
authors.lastname: Farias
authors.affiliation: School of Dentistry, Department of Operative Dentistry, Federal University of Santa Catarina, Campus Universitário Reitor João David Ferreira Lima - Trindade, room 138, 88040-900, Florianópolis, Santa Catarina, Brazil.
authors.forename: Guilherme Carpena
authors.initials: GC
authors.lastname: Lopes
authors.affiliation: School of Dentistry, Department of Operative Dentistry, Federal University of Santa Catarina, Campus Universitário Reitor João David Ferreira Lima - Trindade, room 138, 88040-900, Florianópolis, Santa Catarina, Brazil.
authors.forename: Luiz Narciso
authors.initials: LN
authors.lastname: Baratieri
mesh_terms: D000328:Adult; D000367:Age Factors; D003738:Dental Cements / Q000494:pharmacology*; D045662:Dental Etching / Q000295:instrumentation / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013997:Time Factors
chemical_list: D003738:Dental Cements
keywords: Acid etching; Dentin bonding; Etch and rinse; Non-carious cervical lesions; Randomized clinical trial