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.
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.
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 observe the stress distribution of maxillary first molar and its periodontium in lingual orthodontics.
将大鼠opg重组融合蛋白和生理盐水分别注入实验组和对照组大鼠右侧上颌第一磨牙腭侧的粘骨膜下。
The recombined fused protein of rats 'opg and physiological saline were injected to the palatine-side mucoperiosteum of the first molar of the experimental group and the control group respectively.
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: The thickness of enamel and dentin at different positions of 23 upper first and 18 lower first molars were measured by electronic ruler.
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。
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.
运用免疫组织化学及组织形态分析法观测各组大鼠上颌第一磨牙加力或去除炎症刺激物后0，1，3，5，7，10天的IL-6表达量及牙槽骨吸收量。
Immunohistochemistry and histomorphometric analysis was performed to measure the expression of IL-6 and the loss of alveolar bone at0,1,3, 5,7, and 10 days after the application of orthodontic force.
目的：探讨上颌第一前磨牙的根管解剖形态对根管治疗术难度的影响。
PURPOSE: to investigate the effect of root canal anatomy in maxillary first premolars on root canal treatment difficulty.
目的观察离体上颌第一前磨牙根管解剖结构。
Objective the aim of this study was to investigate the root canal system of maxillary first premolar .
目的：了解上颌第一恒磨牙牙体解剖基础知识。
Objective: to study the anatomy of the maxillary first permanent molars.
目的研究上颌第一前磨牙根管颊舌向的弯曲情况。
Objective To investigate root canal curvatures of human maxillary first premolars in buccolingual directions.
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。
PURPOSE: To estimate the diagnostic potential of the dental operating microscope use for locating MB2 orifice in maxillary first molars.
结论：上颌第一前磨牙的根管类型相对复杂。
Conclusions: The roots of maxillary first premolars possesses a variety of canal system types.
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 sagittal inclinations to the palatal plane of the first and second maxillary molars were measured on panoramic tomography.
结论第三磨牙萌出与上颌第一、第二磨牙较大的近中倾斜有关。
Conclution More mesially inclined maxillary molars are likely to be associated with third molar eruption.
目的 确定人上颌第一前磨牙的颊舌向根管弯曲程度和情况。
The root canals in mandibular first premolars failed to be treated;
目的建立上颌第一前磨牙的精细三维模型，并最终应用于有限元分析(FEA)。
Objective To construct the fine 3d model of the maxillary first premolar for finite element analyzes (FEA).
摘要目的采用锥形束ct (CBCT)探讨上颌第一前磨牙根管的解剖形态，了解其常规形态及变异形态。
Abstract: Objective to investigate the canal morphology of maxillary first premolar using cone-beam ct (CBCT) and to know its generic and variant forms.
摘要目的采用锥形束ct (CBCT)探讨上颌第一前磨牙根管的解剖形态，了解其常规形态及变异形态。
Abstract: Objective to investigate the canal morphology of maxillary first premolar using cone-beam ct (CBCT) and to know its generic and variant forms.
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