Nagasawa Yuko, Eda Yoshikazu, Matsumoto Shigeki, Nakajima Hiroshi, Hibino Yasushi
Division of Dental Biomaterials Science, Department of Restorative and Biomaterials Sciences, Meikai University School of Dentistry, 1-1, Keyakidai, Sakado, Saitama, 350-0283, Japan.
Division of Oral Rehabilitation, Department of Restorative and Biomaterials Sciences, Meikai University School of Dentistry, 1-1, Keyakidai, Sakado, Saitama, 350-0283, Japan.
Odontology. 2025 Apr 9. doi: 10.1007/s10266-025-01098-1.
This study investigated the effect of air-thinning to a two-step adhesive (G2-BOND Universal) on the microtensile bond strength (µTBS) between bovine teeth (enamel, dentin) and a resin composite (G-ænial A'CHORD). The adhesive was applied with or without air-blowing before light curing on the bovine enamel and dentin surfaces finished using 320-grit SiC paper. After resin composite buildup, µTBS specimens (1.0 mm × 1.0 mm cross-sectional area) were fabricated. The µTBS values were determined 24 h, 4 weeks, and 6 months after the specimen preparation. Furthermore, the adhesive layer thicknesses were measured on the SEM photographs of the specimens' fractured site after the µTBS test. Except for the enamel specimens at 6 months, no significant differences were observed in µTBS determined at any time periods between specimens with and without air-blowing (p > 0.05). µTBS values in air-blown specimens increased from 24 h to 4 weeks, and the values in non-air-blown specimens were greater at 6 months than at 24 h. Specimens subjected to air-blowing showed significantly thinner adhesive layer than those without at any time periods (p < 0.05). Although air-blowing reduced adhesive layer thickness, it did not affect the bond strength except for the enamel specimens at 6 months.
本研究调查了对两步法粘结剂（G2-BOND通用型）进行空气稀释处理，对牛牙（牙釉质、牙本质）与树脂复合材料（G-ænial A'CHORD）之间微拉伸粘结强度（µTBS）的影响。在使用320目碳化硅砂纸处理过的牛牙釉质和牙本质表面进行光固化之前，分别在有或无吹气的情况下涂抹粘结剂。在堆积树脂复合材料后，制作µTBS试件（横截面面积为1.0毫米×1.0毫米）。在试件制备后24小时、4周和6个月测定µTBS值。此外，在µTBS测试后，在试件断裂部位的扫描电子显微镜照片上测量粘结剂层厚度。除6个月时的牙釉质试件外，在任何时间段，有吹气和无吹气的试件之间测定的µTBS均未观察到显著差异（p＞0.05）。吹气试件的µTBS值从24小时到4周有所增加，未吹气试件在6个月时的值高于24小时时的值。在任何时间段，经过吹气处理的试件的粘结剂层均显著薄于未吹气的试件（p＜0.05）。尽管吹气降低了粘结剂层厚度，但除6个月时的牙釉质试件外，它并未影响粘结强度。
