Amano Shino, Yamamoto Akira, Tsubota Keishi, Rikuta Akitomo, Miyazaki Masashi, Platt Jeffrey A, Moore B Keith
Nihon University, School of Dentistry, Department of Operative Dentistry, Tokyo, Japan.
Oper Dent. 2006 Sep-Oct;31(5):616-22. doi: 10.2341/05-122.
This study investigated the influence of thermal cycling on the enamel bond strength of single-step self-etch adhesive systems. The systems used were Absolute, Clearfil tri-S Bond, G-Bond and One-Up Bond F Plus. Bovine mandibular incisors were mounted in self-curing resin, and the facial surfaces were wet ground with #600 SiC paper. Adhesives were applied on the prepared enamel surfaces and light irradiated according to each manufacturer's instructions. Resin composites were condensed into a mold (ø4x2 mm) and light irradiated for 30 seconds. Thirty specimens per adhesive systems were divided into 1 of 3 test groups (n=10) following storage in water at 37 degrees C for 24 hours. The specimens were then stored in 37 degrees C water for 24 hours, followed by thermal cycling 10,000 and 20,000 times between 5 degrees C and 60 degrees C. After each storage condition, the specimens were tested in shear mode at a crosshead speed of 1.0-mm/minute. One-way ANOVAs and Tukey HSD test at a level of 0.05 were conducted. After 24 hours of water storage, the mean enamel bond strengths ranged from 11.3 to 16.9 MPa, and Clearfil tri-S Bond showed significantly higher bond strength. After thermal cycling, the mean bond strengths ranged from 8.3 to 20.7 MPa. The changes in enamel bond strengths were different among the adhesive systems tested. Failure modes after the test were commonly adhesive failure associated with partial cohesive failure adhesive in resin. With a careful choice of adhesive systems, the benefit to using single-step self-etch systems in terms of simplifying the clinical procedure might be acceptable, even after thermal stresses.
本研究调查了热循环对单步自酸蚀粘接系统与牙釉质粘接强度的影响。所使用的系统有Absolute、Clearfil tri-S Bond、G-Bond和One-Up Bond F Plus。将牛下颌切牙固定于自凝树脂中，其唇面用#600碳化硅砂纸湿磨。在制备好的牙釉质表面涂布粘接剂，并按照各制造商的说明进行光照。将树脂复合材料填入模具（ø4x2 mm）中并光照30秒。每个粘接系统的30个标本在37℃水中储存24小时后，分为3个测试组中的1组（n = 10）。然后将标本在37℃水中储存24小时，接着在5℃和60℃之间进行10000次和20000次热循环。在每种储存条件后，以1.0毫米/分钟的十字头速度在剪切模式下对标本进行测试。进行了显著性水平为0.05的单因素方差分析和Tukey HSD检验。在水储存24小时后，牙釉质平均粘接强度范围为11.3至16.9兆帕，Clearfil tri-S Bond显示出显著更高的粘接强度。热循环后，平均粘接强度范围为8.3至20.7兆帕。在所测试的粘接系统中，牙釉质粘接强度的变化有所不同。测试后的失败模式通常为与树脂中部分内聚破坏相关的粘接破坏。谨慎选择粘接系统后，即使在热应力作用下，使用单步自酸蚀系统在简化临床操作方面的益处可能是可以接受的。
