Effect of Pretreatment by Carbodiimide on Bonding Properties of Two Kinds of Etch-and-rinse Adhesives

doi:10.13701/j.cnki.kqyxyj.2020.11.016

Abstract

Abstract: Objective: To evaluate the effect of pretreatment by carbodiimide (EDC) on bonding properties of two kinds of etch-and-rinse adhesives to dentin. Methods: 64 human third molars were collected and randomly divided into 8 groups (n=8). Group S, Sa: Pretreatment + ethanol/water-based adhesive (EDC + SB2); Group S0, S0a: No pretreatment + ethanol/water-based adhesive (deionized water + SB2); Group P, Pa: Pretreatment + acetone-based adhesive (EDC + PB); Group P0, P0a: No pretreatment + acetone-based adhesive (deionized water + PB). Group Sa, S0a, Pa, and P0a were conducted thermocycling aging test. 6 specimens were randomly selected from each group to measure the shear bond strength and observe the fracture mode, and the remaining 2 specimens were used to observe the microstructure of the bonding interface under scanning electron microscope (SEM). Results: The shear bond strength of group S was higher than that of group P, group S was higher than group S0, group Sa was higher than group S0a, and group Pa was higher than group P0a (P<0.05). After aging treatment, the shear bond strength of each group decreased, and there were no significant differences between group S and Sa, and group P and Pa (P>0.05). The main effect of adhesives, EDC, and aging treatment alone was significant (P<0.05), but the effect of the second and third order interaction on shear bond strength were not significant (P>0.05). The main fracture was mixed fracture in the immediate groups and interface fracture in the aging groups. SEM observation showed that the hybrid layer was intact in the immediate groups. There were cracks in the hybrid layer in the aging groups, and the cracks were the most obvious in the S0a and P0a groups. Conclusion: EDC pretreatment can improve the immediate shear bond strength of SB2, maintain bonding durability for both SB2 and PB to some extent, and obtain a better microscopic bonding interface.

Key words: carbodiimide, dentin-bonding agents, shear bond strength

ZHENG Yuemei, YAN Guowei, ZHOU Kaixuan, CHEN Yue, XIE Cuiliu. Effect of Pretreatment by Carbodiimide on Bonding Properties of Two Kinds of Etch-and-rinse Adhesives[J]. Journal of Oral Science Research, 2020, 36(11): 1055-1059.

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