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根管充填应恰好充填至根尖孔,但这常难以做到,其失败的原因是超充、欠充或充填不严密(Grossman,1965,1972)。根尖定位最好的方法是在根管内插一器械后摄牙片,若摄片有困难,还可根据病人的反应、到达根尖的阻塞感、纸捻尖端的血汁及根管的平均长度来确定根尖的位置,但均不可靠。此外,还有电子的及声波的测量法(Cash1973),却不适用于无髓牙伴根尖周围病变者。因此,本文作者设制一种价廉、准确、可靠的测量根管长度及确定根尖位置的器
Root canal filling should happen to fill the apical foramen, but this is often difficult to do, with failure due to overfilling, underfilling or underfilling (Grossman, 1965, 1972). The best way to locate the root tip is to insert a piece of dental equipment in the root canal. If the radiography is difficult, you can also reach the apical obstruction according to the patient's reaction, the blood juice at the tip of the paper and the root canal The average length to determine the apical position, but are not reliable. In addition, there are electronic and acoustic measurements (Cash1973), but not for non-pulp teeth with apical lesions around. Therefore, the author of this article has set up a kind of inexpensive, accurate and reliable instrument to measure the length of the root canal and determine the apical position