Ibrahim Ihab M, Elkassas Dina W, Yousry Mai M
Assistant lecturer, Operative Dentistry Department, Faculty of Oral and Dental Medicine, Cairo University, Cairo, Egypt.
Eur J Dent. 2010 Oct;4(4):418-28.
This in vitro study determined the effect of enamel pretreatment with phosphoric acid and ethylenediaminetetraacetic acid (EDTA) on the bond strength of strong, intermediary strong, and mild self-etching adhesive systems.
Ninety sound human premolars were used. Resin composite cylinders were bonded to flat ground enamel surfaces using three self-etching adhesive systems: strong Adper Prompt L-Pop (pH=0.9-1.0), intermediary strong AdheSE (pH=1.6-1.7), and mild Frog (pH=2). Adhesive systems were applied either according to manufacturer instructions (control) or after pretreatment with either phosphoric acid or EDTA (n=10). After 24 hours, shear bond strength was tested using a universal testing machine at a cross-head speed of 0.5 mm/minute. Ultra-morphological characterization of the surface topography and resin/enamel interfaces as well as representative fractured enamel specimens were examined using scanning electron microscopy (SEM).
Neither surface pretreatment statistically increased the mean shear bond strength values of either the strong or the intermediary strong self-etching adhesive systems. However, phosphoric acid pretreatment significantly increased the mean shear bond strength values of the mild self-etching adhesive system. SEM examination of enamel surface topography showed that phosphoric acid pretreatment deepened the same etching pattern of the strong and intermediary strong adhesive systems but converted the irregular etching pattern of the mild self-etching adhesive system to a regular etching pattern. SEM examination of the resin/enamel interface revealed that deepening of the etching pattern was consistent with increase in the length of resin tags. EDTA pretreatment had a negligible effect on ultra-morphological features.
Use of phosphoric acid pretreatment can be beneficial with mild self-etching adhesive systems for bonding to enamel.
本体外研究确定了用磷酸和乙二胺四乙酸（EDTA）对牙釉质进行预处理对强、中强和弱自酸蚀粘结系统粘结强度的影响。
使用90颗完好的人前磨牙。使用三种自酸蚀粘结系统将树脂复合体圆柱体粘结到磨平的牙釉质表面：强粘结性的Adper Prompt L-Pop（pH = 0.9 - 1.0）、中强粘结性的AdheSE（pH = 1.6 - 1.7）和弱粘结性的Frog（pH = 2）。粘结系统按照制造商说明应用（对照），或在用磷酸或EDTA预处理后应用（n = 10）。24小时后，使用万能试验机以0.5毫米/分钟的十字头速度测试剪切粘结强度。使用扫描电子显微镜（SEM）检查表面形貌和树脂/牙釉质界面的超微形态特征以及代表性的牙釉质断裂标本。
两种表面预处理均未在统计学上提高强或中强自酸蚀粘结系统的平均剪切粘结强度值。然而，磷酸预处理显著提高了弱自酸蚀粘结系统的平均剪切粘结强度值。对牙釉质表面形貌的SEM检查表明，磷酸预处理加深了强和中强粘结系统相同的蚀刻图案，但将弱自酸蚀粘结系统不规则的蚀刻图案转变为规则的蚀刻图案。对树脂/牙釉质界面的SEM检查显示，蚀刻图案的加深与树脂突长度的增加一致。EDTA预处理对超微形态特征的影响可忽略不计。
对于与牙釉质粘结的弱自酸蚀粘结系统，使用磷酸预处理可能有益。
