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Publication:
The Chinese Journal of Dental Research

Year 2004
Volume 7 , Issue 1

Back
Pages: 17 - 22

The Direction of Shear Adhesive Strength Between Composite Resin and Dental Hard Tissue

Gang Zheng, BS, PhD/Tong Wang, BS/Hengchang Xu, DDS, PhD

Objective: To study the direction of adhesive strength between composite resins and dental hard tissues. Methods: Two types of composite resins were bonded to the enamel and dentin surface of bovine teeth separately. The dead load shear and impact shear test were performed from the direction of root apex and the cutting edge. Results: The shear adhesive strength between the enamel and the two types of composite resins behaved the same, and the shear adhesive strength from the root apex direction was greater than that of the cutting edge direction. In the dead load shear test, the root apex strength was about two to three times of the latter (P < 0.05). In the impact shear test, the root apex strength 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 types of composite resins. In both dead load shear test and the impact shear test, no statistically significant difference was noted between the 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.

 

 

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