根据达西公式及相对渗透率曲线和毛管压力曲线的表示式，提出了一个描述水锁机理及其影响因素的简化的数学模型。

This paper presents a simplified mathematical model for describing the water block mechanism and its influences, based on Darcy's formula and relative permeability curve and capillary pressure curve.

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方法：从6颗离体的形态正常的人右下颌第一磨牙中，选取密合度最好且形态接近临床要求的1颗进行根管治疗，制作制锁式的带桩嵌体修复体。

METHODS: 1 of the 6 first mandibular molars on the right side with normal morphology in vitro was selected for pulpectomy, which was the best in density and near to clinical requirement in morphology.

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翻转式扳扣式脚管锁使得脚架打开，定位和闭合迅速而简单。

Flip lever leg locks make opening, positioning and closing fast and easy.

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