Bond strength of two resin cements on dentin using different cementation strategies.
OBJECTIVE
This study evaluated the microtensile bond strength of two resin cements to dentin either with their corresponding self-etching adhesives or employing the three-step "etch-and-rinse" technique. The null hypothesis was that the "etch-and-rinse" adhesive system would generate higher bond strengths than the self-etching adhesives.


METHODS
Thirty-two human molars were randomly divided into four groups (N = 32, n = 8/per group): G1) ED Primer self-etching adhesive + Panavia F; G2) All-Bond 2 "etch-and-rinse" adhesive + Panavia F; G3) Multilink primer A/B self-etching adhesive + Multilink resin cement; G4) All-Bond 2 + Multilink. After cementation of composite resin blocks (5 x 5 x 4 mm), the specimens were stored in water (37 degrees C, 24 hours), and sectioned to obtain beams (+/-1 mm(2) of adhesive area) to be submitted to microtensile test. The data were analyzed using 2-way analysis of variance and Tukey's test (alpha = 0.05).


RESULTS
Although the cement type did not significantly affect the results (p = 0.35), a significant effect of the adhesive system (p = 0.0001) was found on the bond strength results. Interaction terms were not significant (p = 0.88751). The "etch-and-rinse" adhesive provided significantly higher bond strength values (MPa) with both resin cements (G2: 34.4 +/- 10.6; G4: 33.0 +/- 8.9) compared to the self-etching adhesive systems (G1: 19.8 +/- 6.6; G3: 17.8 +/- 7.2) (p < 0.0001). Pretest failures were more frequent in the groups where self-etching systems were used.


CONCLUSIONS
Although the cement type did not affect the results, there was a significant effect of changing the bonding strategy. The use of the three-step "etch-and-rinse" adhesive resulted in significantly higher bond strength for both resin cements on dentin.


CONCLUSIONS
Dual polymerized resin cements tested could deliver higher bond strength to dentin in combination with "etch-and-rinse" adhesive systems as opposed to their use in combination with self-etching adhesives.
Melo
Renata Marques
RM
Department of Dental Materials and Prosthodontics, São José dos Campos Dental School, São Paulo State University (UNESP), São Paulo, Brazil.
Ozcan
Mutlu
M
Barbosa
Silvia Helena
SH
Galhano
Graziela
G
Amaral
Regina
R
Bottino
Marco Antonio
MA
Valandro
Luiz Felipe
LF
D000704:Analysis of Variance; D002484:Cementation / Q000379:methods; D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods*; D003799:Dental Stress Analysis; D003804:Dentin; D006801:Humans; D008963:Molar; D019279:Resin Cements; D055116:Self-Curing of Dental Resins; D018709:Statistics, Nonparametric; D013718:Tensile Strength
D019279:Resin Cements