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.
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.
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.
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.
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