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The directionality of share adhesive strength between composite resin and dental hard tissue
Gang Zheng1, Tong Wang, Hengchang Xu
1Dental Material Lab., Research Institute of Stomatology, Peking University, Beijing 100081, China.
Objective:
To inspect the directionality of adhesive strength between composite resins and dental hard tissues.
Methods:
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.
Results:
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).
Conclusion:
The shear adhesive strength between the composite resins and enamel of bovine teeth is related to the acting direction of the shear force.