Objective To investigate the displacements and the stress distributions of a mandibular second molar.
目的了解下颌第二恒磨牙不同载荷下近中移动时的位移及应力分布情况。
Therefore pit and fissure sealing on second molar can be used on the prevention of permanent dental caries.
因此，实现龋病预防三早，重视第二恒磨牙开展窝沟封闭具有实际意义。
Objective: the three-dimensional finite element method models of the maxillary second molar was constructed.
目的：建立人上颌第二磨牙三维有限元模型。
Objective:To compare the changes in third molar position in patients treated with second molar and first premolar extractions.
目的：比较正畸治疗中拔除第二磨牙与拔除第一前磨牙后第三磨牙牙胚位置的不同改变。
Methods the first molar was welded with a molar root movement controller, which extending backward and clinging to the edge of second molar dental cervix.
方法在第一磨牙带环上焊接一控根移动杆，其杆向后延伸紧贴第二磨牙牙冠颈缘上。
Abstract: Objective: To analyze the correlation between the eruption status of the mandibular third molar and the distal caries in the mandibular second molar.
摘要目的：研究下颌第三磨牙萌出状态与第二磨牙远中邻面龋坏的相关性。
Conclusion The molar root movement controller could prevent the side effects and avoid the second molar buccally positioned movement in the process of molar propeller moving the two molars distally.
结论磨牙控根移动杆具有良好防止磨牙推进器推两个磨牙远移过程中的不利副移动作用，并能避免第二磨牙颊向错位。
It's very important to make a space maintainer if the second deciduous molar is lost too soon.
假如第二颗乳牙过早脱落，那摸装上间隙保持器是件要紧的事。
Results the average attrition gradation of the teeth in Neolithic population was 3.88. The attrition degree of the first molar was greater than that of the second!
结果新石器时期人类牙齿的平均磨耗级别是3.88级，磨耗程度第一磨牙大于第二磨牙、大于第三磨牙。
We describe a case which highlights a serious complication of the use of an air rotor for the removal of a right second mandibular molar.
我们描述一个案件突出一个严重的并发症，使用空气转子清除有权下颌第二磨牙。
Conclusion: Mandibular second premolar after pulling, the third molar eruption clearance increased obviously, conduce to the jaw third molar normal eruption.
结论：拔除下颌第二前磨牙后，第三磨牙萌出间隙明显增大，有助于下颌第三磨牙的正常萌出。
Conclusion: Mandibular second premolar after pulling, the third molar eruption clearance increased obviously, conduce to the jaw third molar normal eruption.
结论：拔除下颌第二前磨牙后，第三磨牙萌出间隙明显增大，有助于下颌第三磨牙的正常萌出。
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