Abstract
This study evaluated the influence of surface treatment on the shear bond strength of a composite resin (CR), previously submitted to the application of a temporary cement (TC), to an adhesive luting cement. Eight-four CR cylinders (5 mm diameter and 3 mm high) were fabricated and embedded in acrylic resin. The sets were divided into 6 groups (G1 to G6) (n=12). Groups 2 to 6 received a coat of TC. After 24 h, TC was removed and the CR surfaces received the following treatments: G2: ethanol; G3: rotary brush and pumice; G4: air-abrasion; G5: air-abrasion and adhesive system; G6: air-abrasion, acid etching and adhesive system. G1 (control) did not receive TC or any surface treatment. The sets were adapted to a matrix and received an increment of an adhesive luting cement. The specimens were subjected to the shear bond strength test. ANOVA and Tukey's tests showed that G3 (8.53 MPa) and G4 (8.63 MPa) differed significantly (p=0.001) from G1 (13.34 MPa). The highest mean shear bond strength values were found in G5 (14.78 MPa) and G6 (15.86 MPa). Air-abrasion of CR surface associated with an adhesive system provided an effective bond of the CR to the adhesive luting cement, regardless the pre-treatment with the phosphoric acid.
Highlights
The advance of adhesive techniques in Dentistry has increased the use of composite resins
It is known that during light curing of resin materials, the presence of oxygen does not allow the complete polymerization of the surface, which favors the bonding of new increments of chemically similar materials [5]
The null hypothesis was that there is no significant difference in shear bond strength between treatment protocols
Summary
The advance of adhesive techniques in Dentistry has increased the use of composite resins. This material is widely used in direct and indirect restorative procedures. In situations when the tooth is rebuilt with a composite core, an interaction between this material and the luting cement should occur. Both materials are chemically similar, the suitable bond achieved by the non-polymerized surface layer is harmed because in the composite resin core, the surface is completely polymerized and contaminated by saliva and temporary cement residues [7]. The null hypothesis was that there is no significant difference in shear bond strength between treatment protocols
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