结论前磨牙区的分角投照根尖片和平行投照根尖片均能精确反映牙齿的实际长度。

Conclusion Both periapical films in bisecting Angle technique and in distant paralleling technique can reflect the real teeth length precisely in premolar area.

youdao

结果在前磨牙区，分角投照、平行投照根尖片影像长度和牙齿实际长度之间无显著性差异。

Results The actual teeth lengths shew no significantly different from the teeth length on periapical films of bisecting angle technique and of distant paralleling technique.

youdao

文章就三分角问题分析了三分角双曲线的性质、机械作图法并在此基础上研究对某一角的任意等分问题。

In the light of trisection Angle problem, the paper discusses the nature of trisection Angle and hyperbola and mechanical drawing and explores the problem of arbitrary proportion of a certain Angle.

youdao