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
Loguercio, A.D.; Costenaro, A.; Silveira, A.P.; Ribeiro, N.R.; Rossi, T.R.; Reis, A.
Journal of Adhesive Dentistry 8(4): 255-261
2006
ISSN/ISBN: 1461-5185 PMID: 16958291 Document Number: 602501
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. 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). 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. 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.