To study the effect of root canal filling after confirm the canal working length by using traditional method and endometer method, and to evaluate their veracity, advantages and disadvantages.
研究传统法和根测仪法确定根管工作长度后行根管充填的效果，评价两者的准确性和优缺点。
To study the effect of root canal filling after confirm the canal working length by using traditional method and endometer method, and to evaluate their veracity, advantages and disadvantages.
研究传统法和根测仪法确定根管工作长度后行根管充填的效果，评价两者的准确性和优缺点。
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