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.
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.
Loguercio
Alessandro D
AD
School of Dentistry, Department of Dental Materials and Operative Dentistry, University of Oeste de Santa Catarina, Campus Joaçaba, SC, Brazil. aloguercio@hotmail.com
Costenaro
Aline
A
Silveira
Ana Paula
AP
Ribeiro
Neila Rosane
NR
Rossi
Tissana Rachel
TR
Reis
Alessandra
A
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
D000269:Adhesives; D017220:Dentin-Bonding Agents