Kimochi T, Yoshiyama M, Urayama A, Matsuo T
Department of Conservative Dentistry, School of Dentistry, Tokushima University, Japan.
Dent Mater J. 1999 Dec;18(4):437-43. doi: 10.4012/dmj.18.437.
We have examined the adhesive properties of a new commercial self-etching/self-priming bonding resin (Unifil Bond, UB) to normal and caries-infected dentin of human extracted molars using scanning electron microscopy (SEM) and a micto-tensile bonding strength (MTBS) test. In this study, 7 human extracted molars with moderate occlusal caries were used, and flat surfaces including occlusal dentin caries were prepared from the teeth. After the application of UB to the surfaces, a composite resin was built up, and subjected to the measurement of MTBS and SEM observation of the interfacial morphology between UB and dentin. The MTBS of UB to normal dentin was 33.4 MPa, but that to caries-infected dentin was 11.0 MPa. There was a significant difference between the MTBS to normal and carious dentin. SEM observation revealed that the typical hybrid layer was not formed in caries-infected dentin. These results suggested that resin infiltration into caries-infected dentin was not sufficient to allow perfect sealing of the restoration.
我们使用扫描电子显微镜（SEM）和微拉伸粘结强度（MTBS）测试，研究了一种新型商用自酸蚀/自底漆粘结树脂（Unifil Bond，UB）对人类拔除磨牙的正常牙本质和龋感染牙本质的粘结性能。在本研究中，使用了7颗患有中度咬合龋的人类拔除磨牙，并从这些牙齿上制备了包括咬合牙本质龋在内的平坦表面。在将UB应用于这些表面后，堆积复合树脂，并进行MTBS测量以及UB与牙本质之间界面形态的SEM观察。UB对正常牙本质的MTBS为33.4MPa，但对龋感染牙本质的MTBS为11.0MPa。对正常牙本质和龋牙本质的MTBS之间存在显著差异。SEM观察显示，在龋感染牙本质中未形成典型的混合层。这些结果表明，树脂渗入龋感染牙本质的程度不足以实现修复体的完美密封。
