不同玷污层状态对两步法自酸蚀牙本质粘接系统粘接强度的影响

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Abstract Objective: To compare the influence of the smear layer generated by the high-speed diamond bur or 600 grit silicon carbide paper on the microtensile bond strength (uTBS) of a two-step self-etching adhesive to human dentin. Methods: Flat medium occlusal dentin surfaces of 28 premolars were exposed and divided into 2 groups for further grinding with either a high-speed diamond or 600 grit silicon carbide paper. Two prepared dentin surfaces treated by each method were evaluated for the characteristics of smear layer using a scanning electron microscope (SEM). Twelve specimens from each grinded group were applied with a 2-step self-etching adhesive (OptiBond XTR), then built up with a resin composite. Each bonded specimen was sectioned into 1 mm-thick slab perpendicular to bonded interface.Six slabs from each group were randomly selected for observation of the bonded interface using SEM. Other slabs were cut into 1 mm×1 mm specimens. Fifteen specimens were randomly selected to be tested for microtensile bond strength. Results: The high-speed diamond bur created a significantly thicker and more rough smear layer than the silican carbide paper. There was no statistically significant difference (P>0.05) in microtensile bond strength between the groups. The 2-step self-etching adhesive (OptiBond XTR) could infiltrate well into the peritubular and intratubular dentin, then hybrid layer and resin tags were formed. Conclusion: Different smear layers had no significant influence on the uTBS of Optibond XTR bond to dentin.

Key words： dentin smear layer two-step self-etching adhesive microtensile bond strength

Received: 21 November 2017

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	ZHENG Tieli
	ZHANG Jiahui
	MAO Jiajie
	GU qin.

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https://xb.wmu.edu.cn/EN/ OR https://xb.wmu.edu.cn/EN/Y2018/V48/I6/433

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