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1·Method: Open drainage and dental pulp cavity seal were adopted.

方法：采用开放引流、髓腔封闭二种方法。

2·Instructions: the product is divided into soft shaft pulp cavity hole opener to a pulp cavity axis and hole opener to;

产品说明：该产品分为软轴髓腔扩大器和硬轴髓腔扩大器；

3·If teeth tooth decay before boring to the dental pulp cavity, because root canal treatment technology was not developed teeth almost to escape the pull of fate.

以前如果牙齿蛀牙蛀到牙髓腔，由于当时根管治疗的技术并不发达，牙齿几乎难逃拔掉的命运。

4·Root canal treatment and finished tooth, lost in the pulp cavity nutrition supplies such as nerves, blood vessels, lymphatic, makes itself become more brittle fracture of teeth.

且做完根管治疗的牙齿，失去了牙髓腔中神经、血管、淋巴等营养供应，使得牙齿本身变得较脆易断裂。

5·Objective: To evaluate the clinical effect of mummification of dental pulp through variant cervical dental cavity in elderly people.

前言：目的：评价老年人牙颈部变异洞形干髓术的临床效果。