In small tooth difference of inner meshed transmission, there were a few pairs of tooth faces which were apart from each other for a small gap beside the contact point generated by two meshed teeth.

在少齿差内啮合传动中，存在多对接近啮合的小间隙齿面于理论啮合点左右，轮齿受力产生的微小变形使得某些对齿面相互接触进入啮合状态。

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METHODS: the intact dental plaque biofilm specimen was generated on the tooth surface. The specimens of the biofilms were imaged and analyzed by confocal laser scanning microscope.

方法：从牙齿表面获得完整的菌斑生物膜标本，运用激光共聚焦显微镜对其进行断层扫描和分析。

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The periodontal lesion was generated in the first molars area of miniature pigs by the surgical removal of bone and subsequent silk ligament suture around the cervical portion of the tooth.

通过手术方法去除小型猪第一磨牙牙颈部的牙槽骨和牙周韧带，从而形成牙周损害。

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