但有资料表明下颌切牙的根管解剖形态较为复杂，变异较多。
However, some research data show that mandibular incisors' root canal anatomy is comparatively complex, and root canal system has many variations.
下颌切牙中，双根管、根管分支和根管分歧都有一定的发生率。
The two root canals, root canal diverge and root canal branch et al have considerable incidence. Besides, mesial-distal root canal walls of mandibular incisor teeth are thin.
结果缺牙部位最常见的是下颌中切牙、上颌侧切牙和下颌侧切牙，以少数牙缺失为主，女性多于男性。
Results mandible central incisor, maxillary lateral incisor and mandible lateral incisor were most missing teeth, and there were more females than males.
恒牙萌出于6岁左右，开始于第一恒磨牙以及下颌第一中切牙。这个过程一直持续到将近21岁。
Permanent teeth begin appearing around age 6, starting with the first molars and lower central incisors. This process continues until approximately age 21.
目的：对多曲方丝弓技术中打开咬合所产生的力学系统进行有限元分析，了解多曲方丝弓打开咬合时下颌中切牙牙周膜应力分布情况。
Objective:The purpose of this article is to study the force system that produced by multi-loop edgewise arch wire while opening the bite.
下颌骨的生长方向趋于正常，下切牙略唇倾。
The mandible resumed a normal growth direction, and the lower incisors flared more than normal.
下颌骨的生长方向趋于正常，下切牙略唇倾。
The mandible resumed a normal growth direction, and the lower incisors flared more than normal.
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