Mandibular first molar suffered from dental caries easily.
特别是在下颌第一恒磨牙。
Results of 64 cracked teeth, 28 appeared in maxillary first molar.
结果在64颗隐裂牙中，有28颗发生于上颌第一磨牙。
The fistula was connected with mandibular body but the first molar.
外斜线相连，与下颌第一磨牙根尖不相通连。
The fistula was connected with mandibular body but the first molar.
颊瘘与外斜线相连，与下颌第一磨牙根尖不相通连。
The first molar has the most serious tooth wear and the third molar was the lightest.
第一磨牙的磨耗程度最重，第三磨牙的磨耗程度最轻。
Objective: To observe clinical effect on orthodontic treatment with first molar extraction.
目的：观察采用拔除第一磨牙方法正畸治疗的临床效果。
The first molar plays an important role during mastication so you need a denture to replace it.
第一个磨牙在咀嚼的过程中发挥着重要的作用，因此您需要用一颗假牙来替换它。
But Longgupo also yielded a mystery jaw fragment, including the fourth pre molar and the first molar.
但龙骨坡还发现了一件神秘的下颌残片，包括第四前臼齿和第一臼齿。
Objective To evaluate the clinical effect of preserving the lower first molar with complete vertical fracture.
目的评价保存治疗纵折下颌第一磨牙的临床疗效。
Objective To observe the stress distribution of maxillary first molar and its periodontium in lingual orthodontics.
目的采用有限元的方法研究舌侧矫治过程中上颌第一磨牙牙根、牙周膜、牙槽骨应力分布的特点。
Objective to search the effect of first molar loss on dentition, periodontium and masticatory efficiency in young people.
目的探讨青年人第一磨牙缺失后对牙列、牙周及咀嚼效率的影响。
Objective: to construct of 3-dimensional finite element models of mandibular first molar with structure defect restoration.
前言：目的：建立下颌第一磨牙牙体缺损及修复的三维有限元模型。
Objective:To evaluate the contribution of radiogram in diagnosis of primary vertical root facture in mandibular first molar.
目的：评价直接数字化影像技术在下颌第一磨牙牙根纵裂诊断中的作用。
A couple of days later near the same spot, fossil hunter Alemayehu Asfaw found a piece of a child's jaw with a first molar tooth.
几天以后，在该目击地的附近，化石猎手阿勒迈耶胡·阿斯范(AlemayehuAsfaw)有又发现了一片带有第一臼齿的儿童颌骨化石。
Objective To study the reason and preventive means of the acute inflammation during root canal therapy of submandibular first molar.
目的探讨下颌第一磨牙根管治疗术并发急性炎症的原因和防治措施。
Methods Four different load patterns were added to the three-dimensional finite element model of the maxillary first molar established.
方法采用已建立的上颌第一磨牙三维有限元模型。使用四种不同负荷方式对模型进行加载。
Status of first molar space closure, tooth alignment, occlusal relationship, soft tissue lateral profile after treatment were evaluated.
对治疗后第一磨牙间隙关闭情况、牙关系和侧貌进行评价；
The highest value of all apical areas were in the last molar in Angle II1 model instead of medial root of the first molar in normal occlusion.
安氏II1牙合下颌各牙根尖主应力值均略大于正常牙合，且最高应力值由第一磨牙近中根尖处移至最后一个磨牙根尖处。
Results All parameters of 14 teeth were achieved The parameter of TM in mandibular incisor was the highest and in mandibular first molar lowest.
结果得到右侧上下颌14颗牙的牙动度参数的正常范围，其牙动度参数的均值以下颌前牙最大，下颌第一磨牙最小。
Method: 29 lower first molar Spaces were observed and the height of alveolar crest before and after treatment were analyzed with paired-t tests.
方法：观察下颌第一磨牙陈旧性拔牙间隙29处。测量矫治前后该处牙槽嵴高度，将测量值进行配对t检验。
Unfortunately, the fourth premolar in the upper jaw is quite large and looks like the first molar in the lower jaw; it is known as a carnassial tooth.
不幸的是，上颚的第四颗前臼齿很大，看起来就象是下颚的第一颗臼齿，这颗前臼齿也被称作叫裂齿。
ObjectiveTo observe the effects of the two kinds of rigid fixed bridge design on the stress of the alveolar bone of mandibular first molar after hemisection.
目的观察下颌第一磨牙半切术后两种双端固定桥修复对牙槽骨应力分布的影响。
The third premolar and the first molar of miniature pigs inclinate mesially, and are similar with the first premolar and the first molar of the human beings.
第三前磨牙与第一磨牙长轴为近中倾斜，与人类第一前磨牙和第一磨牙近似。
Objective To solve the problem that the molar propeller moving upper simultaneously two molars distally resulted in the first molar tipping and lingual rotation.
目的探索解决磨牙推进器同时推两个磨牙远移过程中出现第一磨牙向远中倾斜、舌向扭转问题。
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。
Methods: with the help of the POWERSHAPE and ANSYS software, we established 3d dentition FEA models with right mandibular first molar missing and fixed partial denture.
方法：在POWERSHAPE及ANSYS软件的帮助下，建立右下第一磨牙缺失及局部固定义齿的三维有限元模型。
The three dimensional finite element method models of the mandibular first molar was constructed on the computer, which had 63715 nodes and 41676 tetrahedrons elements.
在计算机上建立了下颌第一磨牙三维有限元模型，总节点为63 715个，4面单元数为41 676个。
Metbods: a two dimensional finite element model was built up to analyse the stress within the periodontal tissue of the first molar, with a reduced tooth eruption-resistant force.
方法：用二维有限元法分析阻萌力减少前后下第一磨牙牙周组织内应力分布的变化。
Results Statistically significant difference was detected among two groups in the upper first molar mesial moving, no significant difference was noted in the upper anterior teeth palatal moving.
结果两组上颌第一磨牙近中移动量差异有显著性，而两组上颌前牙腭向位移量差异无显著性。
Results Statistically significant difference was detected among two groups in the upper first molar mesial moving, no significant difference was noted in the upper anterior teeth palatal moving.
结果两组上颌第一磨牙近中移动量差异有显著性，而两组上颌前牙腭向位移量差异无显著性。
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