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.
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.
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.
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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