Hosoya Y, Nakamura N, Kashima C, Ando K, Ikeda Y, Takakaze A, Matsui T, Goto G
Department of Pediatric Dentistry, Nagasaki University School of Dentistry.
Shoni Shikagaku Zasshi. 1991;29(1):32-43.
The purpose of this study was to investigate the influence of thermal cycling on the adhesion of the resin on the young permanent ground enamel which was etched with different etching times. Labial surfaces of 50 extracted and frozen bovine mandibular young permanent incisors were used. The etchant used in this study was 40% phospholic acid gel and the etching times were 0, 10, 20, 30 and 60 seconds. All of the specimens were washed with an air water spray after etching. The bonding agent and composite resin used in this study were Photo Bond and Photo Clearfil A (Kuraray Co.). After thermal cycling tests of 10,000 temperature cycles between 60 degrees C and 4 degrees C water baths, shear bond strengths on the ground enamel were measured. After the shear bond strength tests, all the test surfaces of the enamel and resin specimens were observed using the SEM. The results of this study were compared with the previous results which were not thermal-cycled. The following conclusions were obtained. 1) The etching time which showed the highest bond strength was 30 seconds (45.21 +/- 8.49 Mpa). 2) When the enamel was etched with all of the etching times, the bond strength were significantly higher than that of the enamel without etching. 3) In the etched groups, the bond strength with 20 seconds of etching time was significantly lower than those with 10, 30 and 60 seconds of etching times. 4) In the 10, 30 and 60 seconds etching times, the bond strengths with thermal-cycled groups were significantly higher than those without thermal-cycled groups. 5) On the enamel specimens after the shear bond strength tests, the frequency of the clear prism structures observed on the enamel was higher in the groups which showed higher bond strengths. However, the differences were not significant.
本研究的目的是调查热循环对经不同蚀刻时间蚀刻的年轻恒牙磨除釉质上树脂黏附力的影响。使用了50颗拔除并冷冻的牛下颌年轻恒切牙的唇面。本研究中使用的蚀刻剂是40%磷酸凝胶，蚀刻时间分别为0、10、20、30和60秒。所有标本在蚀刻后用空气水喷雾冲洗。本研究中使用的黏结剂和复合树脂分别是Photo Bond和Photo Clearfil A（可乐丽公司）。在60℃和4℃水浴之间进行10000次温度循环的热循环测试后，测量磨除釉质上的剪切黏结强度。在剪切黏结强度测试后，使用扫描电子显微镜观察釉质和树脂标本的所有测试表面。将本研究的结果与未进行热循环的先前结果进行比较。得出以下结论。1）显示最高黏结强度的蚀刻时间为30秒（45.21±8.49兆帕）。2）当用所有蚀刻时间蚀刻釉质时，黏结强度显著高于未蚀刻的釉质。3）在蚀刻组中，蚀刻20秒的黏结强度显著低于蚀刻10、30和60秒的黏结强度。4）在蚀刻10、30和60秒时，热循环组的黏结强度显著高于未热循环组。5）在剪切黏结强度测试后的釉质标本上，黏结强度较高的组中在釉质上观察到的清晰棱柱结构的频率更高。然而，差异不显著。
