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首页> 外文期刊>Journal of dentistry >Four-year water degradation of a total-etch and two self-etching adhesives bonded to dentin.
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Four-year water degradation of a total-etch and two self-etching adhesives bonded to dentin.

机译：四年的全蚀刻水降解和两种与牙本质粘合的自蚀刻粘合剂。

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OBJECTIVES: To evaluate effect of direct and indirect water storage on the microtensile dentin bond strength of one total-etch and two self-etching adhesives. METHODS: The adhesive materials were: one total-etch adhesive; 'Admira Bond' and two self-etch adhesives; 'Clearfil SE Bond' and 'Hybrid Bond'. Freshly extracted human third molar teeth were used. In each tooth, a Class I cavity (4mmx4mm) was prepared in the occlusal surface with the pulpal floor extending approximately 1mm into dentin. The teeth were divided into three groups (n=18). Each group was restored with the resin composite 'Clearfil APX' using one of the tested adhesives. For each experimental group 3 test procedures (n=6) were carried out: Procedure A: the teeth were stored in water for 24h (control), then sectioned longitudinally, buccolingually and mesiodistally to get rectangular slabs of 1.0-1.2mm thickness on which a microtensile test was carried out. Procedure B: the teeth were also sectioned; however, the slabs were stored in water at 37 degrees C for 4 years before microtensile testing (direct water storage). Procedure C: the teeth were kept in water at 37 degrees C 4 years before sectioning and microtensile testing (Indirect water storage). During microtensile testing the slabs were placed in a universal testing machine and load was applied at cross-head speed of 0.5mm/min. RESULTS: For the 24h control, there was no significant difference in bond strength between the three tested adhesives. After 4 years of indirect water storage, the bond strength decreased but the reduction was not significantly different from those of 24h. After 4 years of direct water storage, the bond strengths of all tested adhesives were significantly reduced compared to their 24h results. CONCLUSION: All the tested adhesives showed no reduction in bond strength after indirect water exposure for 4 years. After 4-year direct water exposure, the bond produced by all tested adhesives was unable to resist deterioration.
机译：目的：评估直接和间接储水对一种全蚀刻和两种自蚀刻粘合剂的微拉伸牙本质粘合强度的影响。方法：粘合剂材料为：一种全蚀刻粘合剂; “ Admira Bond”和两种自蚀刻胶粘剂; “ Clearfil SE债券”和“混合债券”。使用新鲜提取的人类第三磨牙。在每颗牙齿中，在咬合面准备I级腔（4mmx4mm），牙髓底部延伸到牙本质中约1mm。牙齿分为三组（n = 18）。使用测试的粘合剂之一，用树脂复合材料“ Clearfil APX”恢复每一组。对于每个实验组，进行3个测试程序（n = 6）：程序A：将牙齿在水中存放24h（对照组），然后纵向，颊齿和近中切开，以得到厚度为1.0-1.2mm的矩形板进行了微拉伸试验。程序B：牙齿也被切开;但是，在进行微拉伸试验（直接储水）之前，将这些板在37摄氏度的水中保存4年。程序C：在切片和微拉伸试验（间接储水）之前4年，将牙齿保持在37摄氏度的水中。在微拉伸试验中，将板放置在通用试验机中，以0.5mm / min的十字头速度施加载荷。结果：对于24h对照，三种测试粘合剂之间的粘合强度没有显着差异。间接储水4年后，粘结强度下降，但下降幅度与24h无明显差异。直接储水4年后，与24小时的结果相比，所有测试的粘合剂的粘合强度均显着降低。结论：所有测试的粘合剂在间接暴露4年后均未显示粘合强度降低。直接接触水4年后，所有测试的粘合剂产生的粘合力都无法抵抗劣化。

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