Shear Bond Strength of Self-adhesive Resin Cement after Removal of Remnant Eugenol on Dentin Surfaces Using Non-eugenol Zinc Oxide Cement
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Abstract
Objective: To investigate the effect of zinc oxide non-eugenol (ZONE) cement on the shear bond strength between self-adhesive resin (SAR) cement and dentin after zinc oxide-eugenol (ZOE) contamination.
Materials and Methods: Roots of 45 third molars were removed, and coronal parts were sectioned in mesio-distal direction. Buccal and lingual external surfaces of each piece were ground to expose the 3x3 mm dentin area. They were embedded in metal ring with acrylic resin, then randomly divided into six groups (n=15). In Group 1 (control group), no provisional cement was applied to the dentin. Acrylic resin rods were bonded to the dentin with provisional cement in Groups 2-6. ZONE cement (Temp-BondTM NE) with a 1:1 base-to-catalyst ratio was applied in Group 2. ZOE cement (Temp-BondTM) with a 1:1 ratio was applied in Group 3. ZOE cement with a 1:2 ratio was applied in Groups 4-6. The acrylic resin rods and provisional cement were removed from the dentin after 24 hours. ZONE with the 1:1 and 2:1 ratios were applied in Groups 5 and 6 again. The acrylic resin rods and cement were removed after complete setting. All acrylic resin rods were bonded using SAR cement (RelyXTM Unicem). All specimens were shear bond strength test with Universal Testing Machine. Mean shear bond strength was analyzed using one-way ANOVA and Dunnett’s multiple comparisons test.
Results: Specimens in Group 6 showed higher shear bond strength (5.53±0.69 MPa) than those in Group 4 (3.40±0.32 MPa) and Group 5 (3.56±0.44 MPa). However, it was no statistically significant difference (p<0.05) from Group 1 (5.91±0.46 MPa), Group 2 (5.58±0.63 MPa) or Group 3 (5.42±0.67 MPa).
Conclusions: ZONE cement with amount of base higher than catalyst can increase the shear bond strength between SAR cement and dentin after ZOE contamination.
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References
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