VIP Dental Care Clinic, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, China.
Oper Dent. 2013 Jan-Feb;38(1):82-90. doi: 10.2341/11-422-L. Epub 2012 Jun 4.
This study examined the effect of phosphoric acid (PA) etching on the bond strength and acid-base resistant zone (ABRZ) formation of a two-step self-etching adhesive (SEA) system to enamel. An etch-and-rinse adhesive (EAR) system Single Bond (SB) and a two-step SEA system Clearfil SE Bond (SE) were used. Human teeth were randomly divided into four groups according to different adhesive treatments: 1) SB; 2) SE; 3) 35% PA etching→SE primer→SE adhesive (PA/SEp+a); (4) 35% PA etching→SE adhesive (PA/SEa). Microshear bond strength to enamel was measured and then statistically analyzed using one-way analysis of variance and the Tukey honestly significant difference test. The failure mode was recorded and analyzed by χ( 2 ) test. The etching pattern of the enamel surface was observed with scanning electron microscope (SEM). The bonded interface was exposed to a demineralizing solution (pH=4.5) for 4.5 hours and then 5% sodium hypochlorite with ultrasonication for 30 minutes. After argon-ion etching, the interfacial ultrastructure was observed using SEM. The microshear bond strength to enamel of the SE group was significantly lower (p<0.05) than that of the three PA-etched groups, although the latter three were not significantly different from one another. The ABRZ was detected in all the groups. In morphological observation, the ABRZ in the three PA-etched groups were obviously thicker compared with the SE group with an irregular wave-shaped edge.
本研究考察了磷酸（PA）蚀刻对两步自酸蚀粘结（SEA）系统对牙釉质粘结强度和酸碱抗性区（ABRZ）形成的影响。使用了一种蚀刻-冲洗粘结（EAR）系统Single Bond（SB）和一种两步 SEA 系统Clearfil SE Bond（SE）。根据不同的粘结处理，将人牙随机分为四组：1）SB；2）SE；3）35%PA 蚀刻→SE 底漆→SE 粘结剂（PA/SEp+a）；4）35%PA 蚀刻→SE 粘结剂（PA/SEa）。用微剪切粘结强度仪测量牙釉质的粘结强度，然后用单因素方差分析和 Tukey Honestly Significant Difference 检验进行统计分析。用 χ(2)检验记录和分析失效模式。用扫描电子显微镜（SEM）观察牙釉质表面的蚀刻图案。将粘结界面暴露于脱矿溶液（pH=4.5）中 4.5 小时，然后用超声处理 5%次氯酸钠 30 分钟。氩离子蚀刻后，用 SEM 观察界面超微结构。SE 组的牙釉质粘结强度明显低于（p<0.05）其余三组 PA 蚀刻组，尽管后三组之间无显著差异。所有组均检测到 ABRZ。在形态学观察中，与 SE 组相比，三组 PA 蚀刻组的 ABRZ 明显更厚，边缘呈不规则波浪形。
