Comparison of the shear bond strength of self-adhesive resin cements to enamel and dentin with different protocol of application

Abstract

AimThe aim of the present study was to determine the shear bond strength of self-adhesive resin cements to enamel and dentin with and without surface treatments, and compare them with conventional resin cement as the control group.MethodsIn this experimental study, buccal and lingual surface of the thirty sound human premolars were polished in order to obtain a flat surface of enamel (E) in buccal, and dentin (D) in lingual. Sixty feldspathic ceramic blocks (2×3×3 mm) were prepared and randomly divided into six groups (n=10). Each block was cemented to the prepared surface (30 enamel and 30 dentin surface) according to different protocol: E1 and D1; RelyX ARC as control group, E2, D2; RelyX Unicem, E3, D3; acid etching +RelyX Unicem. The specimens were termocycled and subjected to shear forces by a universal testing machine at a cross head speed of 0.5 mm/min. The mode of fracture were evaluated by stereomicroscope. Data were analyzed with descriptive statistical methods using SPSS version 15. One-way ANOVA, and post hoc Tukey tests were used to compare bond strengths between the groups with different adhesives at α=0.05.ResultsStatistical analysis showed no significant differences within the enamel subgroups, but there were significant differences within the dentinal subgroups, and statistically significant differences were found between the groups D1and D3 (p=0.02). Comparison between similar enamel and dentinal subgroups showed that there was a significant difference just between the subgroups E3 and D3 (p=0.01).ConclusionElective etching of enamel did not lead to significant increase in the shear bond strength of RelyX Unicem in comparison to RelyX ARC. On the other hand, elective etching of dentin reduces the bond strength of RelyX Unicem with the dentin.

Bond strength of self-adhesive resin cement to dentin using different adhesion protocols

“…Regarding enamel substrate conditioning, Moghaddas et al . ( 4 ) mentioned that there is no influence on the strength of the union. However, for the dentin substrate, it is argued that the self-adhesive cement is not able to demineralize/dissolve the smear layer completely.…”

“…However, for the dentin substrate, it is argued that the self-adhesive cement is not able to demineralize/dissolve the smear layer completely. And this partial demineralization of the smear layer results in a lower potential for adhesion to dentin ( 4 , 13 , 14 ).…”

“…Some studies suggest that cement alone is capable of demineralizing and incorporating the smear layer in the dentin bonding process ( 1 - 3 ). Others indicate that maintaining the smear layer can interfere with the adhesive efficiency of such materials ( 4 , 13 , 14 ). But the fact of conditioning the dentin can also hinder the adaptation and adhesion of the resin material, as it increases the dentin water flow, and can compromise the adhesive bond, in addition to interfering with the polymerization of the material ( 15 ).…”

Effectiveness of dentin pre-treatment on bond strength of two self-adhesive resin cements compared to an etch-and-rinse system: an in vitro study

“…In relation to dentin, some studies showed that the performance of self-adhesive resin cements is comparable to that of etch-and-rinse systems on coronal dentin. Comparison of the shear bond strength of self-adhesive resin cements to enamel and dentin with different protocol of application ( Moghaddas et al 2017 ). Rodrigues et al (2015) , while other studies showed opposite results, the bond strength to dentin with self-adhesive cements being significantly lower ( De Angelis et al, 2011 ; Lührs et al, 2010 ; Viotti et al, 2009 ).…”

Effect of a Novel Ceramic Surface Treatment on the Retention of Lithium Disilicate Crowns Bonded With Two Different Luting Approaches an Invitro Study

“…The second approach is through using self-adhesive resin cements which do not need any preceding intervention applied to the tooth. They are composed of multifunctional acid methacrylate, the acidic content causes demineralization of dentin, while the methacrylate component(resin) infiltrates dentin forming hybrid layer and resin tags, with the smear layer incorporated in the hybrid layer (Moghaddas et al 2017).…”