目的了解正常青壮年第一磨牙的牙体厚度。
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.
目的评价保存治疗纵折下颌第一磨牙的临床疗效。
Objective To evaluate the clinical effect of preserving the lower first molar with complete vertical fracture.
目的分析活髓下颌第一磨牙根纵裂的解剖学病因。
Objective to study the anatomical factors of vertical root fractures (VRFs) on vital pulp of maxillary first molar.
目的：了解上下颌第一磨牙牙釉质及牙本质的厚度。
Objective: To measure the thickness of enamel and dentin of the first molars.
颊瘘与外斜线相连，与下颌第一磨牙根尖不相通连。
The fistula was connected with mandibular body but the first molar.
第一磨牙的磨耗程度最重，第三磨牙的磨耗程度最轻。
The first molar has the most serious tooth wear and the third molar was the lightest.
目的：观察采用拔除第一磨牙方法正畸治疗的临床效果。
Objective: To observe clinical effect on orthodontic treatment with first molar extraction.
目的研究上颌第一磨牙近中颊根第二根管的临床发现率。
Aim To investigate the clinical incidence of the second mesiobuccal root canal of maxillary first molars.
结果在64颗隐裂牙中，有28颗发生于上颌第一磨牙。
Results of 64 cracked teeth, 28 appeared in maxillary first molar.
目的：分析上颌第一磨牙根管弯曲位置、方向及弯曲度。
Objective: To analyse the root canal curvature frequency, position, direction and degree of the maxillary first molars.
对治疗后第一磨牙间隙关闭情况、牙关系和侧貌进行评价；
Status of first molar space closure, tooth alignment, occlusal relationship, soft tissue lateral profile after treatment were evaluated.
结果：建立了上颌第一磨牙残根桩核冠的三维有限元模型。
Result: the three-dimensional models of the first maxillary molar residual root restored with post-core crown were generated.
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 search the effect of first molar loss on dentition, periodontium and masticatory efficiency in young people.
交互牵引结合固定平面导板是矫治下颌第一磨牙舌倾的有效方法。
Clinical application of intermaxillary traction and fixed flat bite-plate could correct lingual inclination of mandibular molar effectively.
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。
Objective To study the reason and preventive means of the acute inflammation during root canal therapy of submandibular first molar.
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 construct of 3-dimensional finite element models of mandibular first molar with structure defect restoration.
结论采用半切术技术保留下颌第一磨牙远中根的修复可获得满意效果。
Conclusion The hemisection can get satisfactory effect to repair the first mandibular molar with distal tooth reservated by selecting suitable tooth.
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。
Objective:To evaluate the contribution of radiogram in diagnosis of primary vertical root facture in mandibular first molar.
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。
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.
目的探讨在临床上上颌第一磨牙近中颊根第二根管(MB 2)的发现及扩通。
Objective To investigate the clinical discovery and expanding of the second mesiobuccal canal (MB2) in maxillary first molars.
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。
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。
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.
通过手术方法去除小型猪第一磨牙牙颈部的牙槽骨和牙周韧带，从而形成牙周损害。
The periodontal lesion was generated in the first molars area of miniature pigs by the surgical removal of bone and subsequent silk ligament suture around the cervical portion of the tooth.
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。
Methods Four different load patterns were added to the three-dimensional finite element model of the maxillary first molar established.
目的研究上颌第一磨牙根管口形态和位置关系，为根管治疗时寻找根管口提供解剖学依据。
Objective To study the shape and location of root canal orifice in maxillary first permanent molar and provide a morphological basis for locating canal orifice in endodontic therapy.
结果：离体牙10颗，上颌第一磨牙近中颊根第二根管发现率为60%，通畅率为50%。
RESULTS: MB2 canal can be located in 60% and dilate 50% of 10 extracted maxillary first molars.
结果20例患者的24颗上颌第一磨牙中有14颗存在近中颊根第二根管，发现率为58。
Results Of the 24 maxillary first molars of 20 patients, 14 of the molars had second mesiobuccal root canals.
结果20例患者的24颗上颌第一磨牙中有14颗存在近中颊根第二根管，发现率为58。
Results Of the 24 maxillary first molars of 20 patients, 14 of the molars had second mesiobuccal root canals.
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