Objective To measure the thickness of the first molars.
目的了解正常青壮年第一磨牙的牙体厚度。
Objective: To measure the thickness of enamel and dentin of the first molars.
目的：了解上下颌第一磨牙牙釉质及牙本质的厚度。
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。
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.
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。
Results The successful rate of conservative prosthetics was 94% in the first mandibular molars, while 67% in the second molars.
结果保存修复的成功率下颌第一恒磨牙为94％，第二恒磨牙为67％。
Objective: to study the anatomy of the maxillary first permanent molars.
目的：了解上颌第一恒磨牙牙体解剖基础知识。
PURPOSE: To estimate the diagnostic potential of the dental operating microscope use for locating MB2 orifice in maxillary first molars.
目的：评价手术显微镜用于探寻上颌第一恒磨牙mb 2根管口的诊断价值。
Methods: The thickness of enamel and dentin at different positions of 23 upper first and 18 lower first molars were measured by electronic ruler.
方法：用电子测量尺测量23颗上颌第一磨牙和18颗下颌第一磨牙牙合面不同部位牙釉质、牙本质的厚度。
METHODS: 1 of the 6 first mandibular molars on the right side with normal morphology in vitro was selected for pulpectomy, which was the best in density and near to clinical requirement in morphology.
方法：从6颗离体的形态正常的人右下颌第一磨牙中，选取密合度最好且形态接近临床要求的1颗进行根管治疗，制作制锁式的带桩嵌体修复体。
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。
Methods Two groups of first mandibular molars with different root morphology were used to establish the model after immediate implant, and immediate loading of the first mandibular molars were built.
方法用两组牙根解剖形态不同的下颌第一磨牙建立下颌第一磨牙即刻种植即刻负重的三维有限元模型。
Objective To investigate the clinical discovery and expanding of the second mesiobuccal canal (MB2) in maxillary first molars.
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。
Aim To investigate the clinical incidence of the second mesiobuccal root canal of maxillary first molars.
目的研究上颌第一磨牙近中颊根第二根管的临床发现率。
Objective: To analyse the root canal curvature frequency, position, direction and degree of the maxillary first molars.
目的：分析上颌第一磨牙根管弯曲位置、方向及弯曲度。
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 Maxillary first and second molars were more mesially inclined in the first group, particularly in the younger subjects (16 ~ 25 years). This inclination increased with age.
结果上颌第三磨牙萌出组与未萌出组相比，上颌第一磨牙和第二磨牙更向近中倾斜，而且随年龄的增加倾斜度也变大。
The sagittal inclinations to the palatal plane of the first and second maxillary molars were measured on panoramic tomography.
在曲面断层片上分别测量上颌第一和第二磨牙与腭平面所成的角度。
The first one was subjected to the exodontia of the right upper molars, and then divided into 4 groups, including 2,4,8 and 12 week groups, respectively.
单侧后牙缺失咬合异常模型建立和分组：拔出右侧上颌所有磨牙建立单侧咀嚼咬合异常模型，并分为建模2周组、4周组、8周组、12周组；
The composition ratio of first and second permanent molars caries increased with the age increasing.
第二恒磨牙龋与第一恒磨牙龋构成比随年龄增长而上升。
The composition ratio of first and second permanent molars caries increased with the age increasing.
第二恒磨牙龋与第一恒磨牙龋构成比随年龄增长而上升。
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