title: A six-month clinical study of a self-etching and an etch-and-rinse adhesive applied as recommended and after doubling the number of adhesive coats.
abstract: OBJECTIVE
  In an intra-individual comparison, a 6-month randomized, controlled prospective study evaluated the clinical performance of a self-etching and an etch-and-rinse adhesive in noncarious cervical lesions applied as recommended and after doubling the number of adhesive coats.
  
  
  METHODS
  Twenty-nine patients with at least two pairs of similar sized noncarious cervical lesions participated. One hundred sixteen restorations were placed and divided into the following groups: OS2: phosphoric acid + One Step Plus applied accordingto manufacturer's recommendation (2 coats of adhesive); OS4: phosphoric acid + One Step Plus (4 coats of adhesive); TY2: Tyrian SPE + One Step Plus applied according to manufacturer's recommendation (2 coats of adhesive); TY4: Tyrian SPE + One Step Plus (4 coats of adhesive). The restorations were evaluated at baseline and after 6 months according to the modified USPHS criteria. Statistical analysis was performed with Friedman repeated measures ANOVA by rank and the Wilcoxon sign-ranked test for pairwise significance (alpha = 0.05).
  
  
  RESULTS
  One hundred eight restorations were evaluated at 6 months. The retention rate of the group TY2 was statistically significantly lower than the other groups. Marginal discoloration occurred in all groups, being significantly worst in the group TY2.
  
  
  CONCLUSIONS
  Tyrian SPE + One Step Plus applied according to manufacturer's recommendations did not meet the ADA provisional acceptance criteria for enamel-dentin bonded restorative materials. The use of four coats of the One Step Plus in the self-etching approach can improve its clinical performance.
authors.affiliation: School of Dentistry, Department of Dental Materials and Operative Dentistry, University of Oeste de Santa Catarina, Campus Joaçaba, SC, Brazil. aloguercio@hotmail.com
authors.forename: Alessandro D
authors.initials: AD
authors.lastname: Loguercio
authors.forename: Aline
authors.initials: A
authors.lastname: Costenaro
authors.forename: Ana Paula
authors.initials: AP
authors.lastname: Silveira
authors.forename: Neila Rosane
authors.initials: NR
authors.lastname: Ribeiro
authors.forename: Tissana Rachel
authors.initials: TR
authors.lastname: Rossi
authors.forename: Alessandra
authors.initials: A
authors.lastname: Reis
mesh_terms: D000269:Adhesives / Q000737:chemistry*; D000328:Adult; D001840:Dental Bonding / Q000379:methods*; D017268:Dental Prosthesis Retention / Q000379:methods*; D019232:Dental Restoration Failure; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged
chemical_list: D000269:Adhesives; D017220:Dentin-Bonding Agents