结论：牙齿长度电测法是一种比较准确、客观的测量牙齿工作长度的方法。
CONCLUSION: The method of root canal length measured with TRI AUTO ZX root canal apex locator is one kind of accurate and impersonal one.
目的探讨数字化根尖片和普通根尖片在评价牙齿长度和牙根吸收方面的差异。
Objective to investigate the difference between digital periapical film and conventional film in the evaluation of tooth length and root resorption.
目的探讨前磨牙区分角投照根尖片和平行投照根尖片在评价牙齿长度方面的差异。
Objective To investigate the differences of periapical films in bisecting angle technique and in distant paralleling technique on evaluation of tooth length.
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