Tam L E, Pilliar R M
Department of Restorative Dentistry, Centre for Biomaterials, Faculty of Dentistry, Toronto, Ontario, Canada.
J Dent Res. 1994 Sep;73(9):1530-8. doi: 10.1177/00220345940730090801.
It has been proposed that the fracture toughness test provides an appropriate method for assessing the fracture resistance of the dentin-composite interface. The plane-strain fracture toughness test was therefore applied to a dentin-composite interface, with use of a specific dentinal adhesive, so that the effects of various dentin surface treatments on dentin-bond integrity could be studied. Interfacial fracture toughness (KIC) values were determined following 24h and 180 days of specimen aging in distilled water at 37 degrees C. Tensile bond strength (TBS) results following 24-hour aging were also obtained for comparison with the 24-hour KIC results. In general, the fracture resistance of the dentin-composite interface was highest when the dentin surface was conditioned with acid but not air-dried, intermediate when the dentin surface was conditioned with acid and subsequently air-dried, and lowest when the dentin was not conditioned with acid. The tensile bond strength results differed from the fracture toughness results in indicating differences in surface preparation effects and the type of interfacial failure observed.
有人提出，断裂韧性测试为评估牙本质 - 复合材料界面的抗断裂性提供了一种合适的方法。因此，采用特定的牙本质粘合剂，将平面应变断裂韧性测试应用于牙本质 - 复合材料界面，以便研究各种牙本质表面处理对牙本质粘结完整性的影响。在37摄氏度的蒸馏水中对试样进行24小时和180天老化后，测定界面断裂韧性（KIC）值。还获得了24小时老化后的拉伸粘结强度（TBS）结果，以便与24小时的KIC结果进行比较。一般来说，当牙本质表面用酸处理但不风干时，牙本质 - 复合材料界面的抗断裂性最高；当牙本质表面用酸处理并随后风干时，抗断裂性中等；当牙本质不用酸处理时，抗断裂性最低。拉伸粘结强度结果与断裂韧性结果不同，表明表面处理效果和观察到的界面失效类型存在差异。
