Say Esra Can, Nakajima Masatoshi, Senawongse Pisol, Soyman Mübin, Ozer Füsun, Tagami Junji
Department of Operative Dentistry, Faculty of Dentistry, Yeditepe University, Istanbul, Turkey.
Oper Dent. 2005 Jan-Feb;30(1):90-8.
This study aimed to evaluate the microtensile bond strength (microTBS) of photo- and dual-cure adhesives to sound and caries-affected dentin using total- and self-etch techniques. Human third molars with occlusal caries were prepared as previously described by Nakajima and others (1995). Dentin surfaces were bonded with Optibond Solo Plus (Kerr; photo-cure adhesive) or Optibond Solo Plus + Dual-cure activator (Kerr; dual-cure adhesive) with total- and self-etch technique. Clearfil AP-X (Kuraray) was used for composite buildups. Following storage in distilled water at 37 degrees C for 24 hours, the teeth were sectioned into 0.7-mm thick slices to obtain sound and caries-affected dentin slabs, then trimmed to form hour glass shapes with a 1 mm2 cross-sectional area. The specimens were subjected to microtensile testing using EZ-test (Shimadzu) at 1 mm/minute. Data were analyzed using three-way ANOVA and Student's t-Test (p<0.05). Bond strengths to sound dentin with photo- and dual-cure adhesives using total- and self-etch techniques were significantly higher than those to caries-affected dentin. Dual-cure adhesive significantly decreased bond strengths both to sound and caries-affected dentin. The total-etch technique showed no beneficial effect on caries-affected dentin compared with the self-etch technique. Scanning electron microscopic observation of the resin-dentin interfaces revealed that hybrid layers in caries-affected dentin were thicker than those observed in sound dentin with photo- and dual-cure adhesives. Resin infiltration into dentinal tubules of caries-affected dentin was hampered by the presence of mineral deposits.
本研究旨在使用全酸蚀和自酸蚀技术，评估光固化和双固化粘结剂与健康牙本质及龋损牙本质之间的微拉伸粘结强度（microTBS）。按照中岛等人（1995年）先前描述的方法，制备患有咬合面龋的人类第三磨牙。使用全酸蚀和自酸蚀技术，将Optibond Solo Plus（登士柏；光固化粘结剂）或Optibond Solo Plus + 双固化活化剂（登士柏；双固化粘结剂）粘结于牙本质表面。使用Clearfil AP-X（可乐丽）进行复合树脂充填。在37℃蒸馏水中储存24小时后，将牙齿切成0.7毫米厚的薄片，以获得健康牙本质和龋损牙本质片，然后修整成沙漏形状，使其横截面积为1平方毫米。使用EZ-test（岛津）以1毫米/分钟的速度对标本进行微拉伸测试。使用三因素方差分析和学生t检验（p<0.05）对数据进行分析。使用全酸蚀和自酸蚀技术的光固化和双固化粘结剂与健康牙本质之间的粘结强度显著高于与龋损牙本质之间的粘结强度。双固化粘结剂显著降低了与健康牙本质和龋损牙本质之间的粘结强度。与自酸蚀技术相比，全酸蚀技术对龋损牙本质没有显示出有益效果。树脂-牙本质界面的扫描电子显微镜观察显示，使用光固化和双固化粘结剂时，龋损牙本质中的混合层比健康牙本质中的混合层更厚。龋损牙本质牙本质小管中的树脂浸润受到矿物质沉积的阻碍。
