对干砂的抗剪强度进行了研究，认为型砂存在咬合强度。

The shear strength of dry sand has been studied, the result shows the interlocking strength existing interdry sands compacted.

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目的研究不同粘接剂与不同的粘接界面处理方法对陶瓷全冠咬合强度的影响，选择最佳粘接方式。

Objective This research is to choose the best bonding way of ceramic crown by investigating the effects of different bonding agents and interfacial treatment on the occlusal strength of ceramic crown.

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由于咬合力的存在，使粗粒土的强度大幅度提高。

It may raise the strength of the coarse grained soil.

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