Bond strength and morphology of enamel using self-etching adhesive systems with different acidities.
OBJECTIVE
To assess the bond strength and the morphology of enamel after application of self-etching adhesive systems with different acidities. The tested hypothesis was that the performance of the self-etching adhesive systems does not vary for the studied parameters.


METHODS
Composite resin (Filtek Z250) buildups were bonded to untreated (prophylaxis) and treated (bur-cut or SiC-paper) enamel surfaces of third molars after application of four self-etching and two etch-and-rinse adhesive systems (n=6/condition): Clearfil SE Bond (CSE); OptiBond Solo Plus Self-Etch (OP); AdheSe (AD); Tyrian Self Priming Etching (TY), Adper Scotchbond Multi-Purpose Plus (SBMP) and Adper Single Bond (SB). After storage in water (24 h/37 degrees C), the bonded specimens were sectioned into sticks with 0.8 mm(2) cross-sectional area and the microtensile bond strength was tested at a crosshead speed of 0.5 mm/min. The mean bond strength values (MPa) were subjected to two-way ANOVA and Tukey's test (alpha=0.05). The etching patterns of the adhesive systems were also observed with a scanning electron microscope.


RESULTS
The main factor adhesive system was statistically significant (p<0.05). The mean bond strength values (MPa) and standard deviations were: CSE (20.5+/-3.5), OP (11.3+/-2.3), AD (11.2+/-2.8), TY (11.1+/-3.0), SBMP (21.9+/-4.0) and SB (24.9+/-3.0). Different etching patterns were observed for the self-etching primers depending on the enamel treatment and the pH of the adhesive system.


CONCLUSIONS
Although there is a tendency towards using adhesive systems with simplified application procedures, this may compromise the bonding performance of some systems to enamel, even when the prismless enamel is removed.
Moura
Sandra Kiss
SK
Department of Dentistry, University North of Paraná, Londrina, PR, Brazil.
Reis
Alessandra
A
Pelizzaro
Arlete
A
Dal-Bianco
Karen
K
Loguercio
Alessandro Dourado
AD
Arana-Chavez
Victor Elias
VE
Grande
Rosa Helena Miranda
RH
D000704:Analysis of Variance; D001840:Dental Bonding; D003738:Dental Cements; D003743:Dental Enamel; D008422:Materials Testing
D003738:Dental Cements