Costa Luciana Artioli, Carneiro Karina Kato, Tanaka Auro, Lima Darlon Martins, Bauer José
Department of Dentistry I, School of Dentistry, Universidade Federal do Maranhão, São Luis, MA, Brazil.
Department of Chemistry, Center of Sciences and Technology, Universidade Federal do Maranhão, São Luis, MA, Brazil.
Braz Oral Res. 2014;28:1-7. doi: 10.1590/1807-3107bor-2014.vol28.0055. Epub 2014 Oct 14.
The aim of this study was to evaluate the pH, ultimate tensile strength (UTS), and micro-shear bond strength (µSBS) of two self-adhesive resin cements to enamel and dentin. Sound bovine incisors (n = 10) and two self-adhesive resin cements (i.e., RelyX U-100 and seT PP) were used. The pH of the resin cements was measured using a pH-indicator paper (n = 3). Specimens for UTS were obtained from an hourglass-shaped mold. For µSBS, cylinders with internal diameter of 0.75 mm and height of 0.5 mm were bonded to the flat enamel and dentin surfaces. Bonded cylinders were tested in the shear mode using a loop wire. The fracture mode was also evaluated. The cement seT PP showed a low pH; U-100 showed significantly higher UTS (49.9 ± 2.0) than seT PP (40.0 ± 2.1) (p < 0.05) and high µSBS to enamel (10.7 ± 3.7). The lowest µSBS was found for seT PP to dentin (0.7 ± 0.6); seT PP to enamel (4.8 ± 1.7), and for U-100 to dentin (7.2 ± 1.9), showing an intermediate µSBS value (p < 0.05). Adhesive failure was the most frequently observed failure mode. The resin cement that presented the lowest pH and UTS also presented the lowest micro-shear bond strength to enamel and dentin.
本研究的目的是评估两种自粘接树脂水门汀对牙釉质和牙本质的pH值、极限拉伸强度（UTS）和微剪切粘结强度（µSBS）。使用了完好的牛切牙（n = 10）和两种自粘接树脂水门汀（即RelyX U-100和seT PP）。使用pH试纸测量树脂水门汀的pH值（n = 3）。UTS测试样本取自沙漏形模具。对于µSBS测试，将内径0.75 mm、高度0.5 mm的圆柱体粘结到平坦的牙釉质和牙本质表面。使用环形金属丝以剪切模式测试粘结的圆柱体。还评估了断裂模式。seT PP水门汀显示出较低的pH值；U-100显示出比seT PP（40.0±2.1）显著更高的UTS（49.9±2.0）（p < 0.05）以及对牙釉质较高的µSBS（10.7±3.7）。发现seT PP对牙本质的µSBS最低（0.7±0.6）；seT PP对牙釉质的µSBS为（4.8±1.7），U-100对牙本质的µSBS为（7.2±1.9），呈现出中等的µSBS值（p < 0.05）。粘结失败是最常观察到的失败模式。呈现最低pH值和UTS的树脂水门汀对牙釉质和牙本质的微剪切粘结强度也最低。
