Zheng Gang, Wang Tong, Xu Hengchang
Dental Material Lab., Research Institute of Stomatology, Peking University, Beijing 100081, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2002 Sep;37(5):346-8.
To inspect the directionality of adhesive strength between composite resins and dental hard tissues.
Two kinds of composite resins were bonded with their luting kits to the enamel and dentin surfaces of bovine teeth separately. The dead load shear and impact shear testing were performed from both of root apex direction and cutting edge direction.
The shear adhesive strength between the enamel and two kinds of composite resins was on the same behavior, that the shear adhesive strength of root apex direction was greater than that of cutting edge direction. In the dead load shear testing, the former was about two to three times of the latter (P < 0.05). In the impact shear testing, the former was about three to four times of the latter (P < 0.001). The effect of the direction of acting force was small on the shear adhesive strength between the dentin and two kinds of composite resins. In the both dead load shear testing and impact shear testing, there was no statistically significant difference between the datum of two directional loadings (P > 0.05, P > 0.5).
The shear adhesive strength between the composite resins and enamel of bovine teeth is related to the acting direction of the shear force.
考察复合树脂与牙体硬组织间粘结强度的方向性。
将两种复合树脂分别用其配套粘结剂粘结于牛牙的釉质和牙本质表面。从根尖方向和切缘方向分别进行静载剪切和冲击剪切试验。
釉质与两种复合树脂间的剪切粘结强度表现一致，即根尖方向的剪切粘结强度大于切缘方向。在静载剪切试验中，前者约为后者的两到三倍（P < 0.05）。在冲击剪切试验中，前者约为后者的三到四倍（P < 0.001）。作用力方向对牙本质与两种复合树脂间的剪切粘结强度影响较小。在静载剪切试验和冲击剪切试验中，两个方向加载的数据均无统计学显著差异（P > 0.05，P > 0.5）。
复合树脂与牛牙釉质间的剪切粘结强度与剪切力的作用方向有关。
