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 .
目的观察上颌第二前磨牙的牙根及根管形态。
Objective To investigate the root and canal morphology of extracted maxillary second premolars.
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.
目的：研究离体下颌前磨牙的牙根及根管形态。
Objective: To investigate the root and canal morphology of extracted mandibular premolars.
方法收集离体人前磨牙60个，随机分成6组。
Methods 60 human premolars were selected and divided into six groups by random.
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.
下颌前磨牙创伤咬合点加载的三维有限元应力分析。
Three-dimensional finite element analysis of the stress of the mandible premolar under loading on its traumatic occlusal spots.
相同倒凹条件下，磨牙卡环的固位力比前磨牙卡环大。
The retention of the clasp on molar is greater than premolar in the same condition of undercut.
相同倒凹深度上，磨牙金合金卡环固位力比前磨牙大。
The retention of gold alloy clasp on the molar was greater than that on the premolar in the same condition of undercut.
相同倒凹条件下，磨牙卡环的固位力比前磨牙卡环大。
The retention of gold alloy clasp on the molar was greater than that on the premolar in the same condition of undercut.
研究目的：探讨下颌前磨牙生理性根尖孔的形态特征。
Objective: To investigate the morphology of physiological foramen of mandibular premolars.
相同倒凹深度上，磨牙金合金卡环固位力比前磨牙大。
The retention of the clasp on molar is greater than premolar in the same condition of undercut.
封闭剂在是牙齿咀嚼面上覆盖一层保护材料——在磨牙或者前磨牙。
Sealants are protective coatings placed over the tops of chewing teeth - molars and premolars.
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.
患侧磨牙、前磨牙咬合骨断层应力分布下部为张力带、上部为压力带。
When occlusion by molar and premolar of fracture part, the stress of upper fracture part was bending force and the lower was compressing force.
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.
结论：第二前磨牙拔除患者可发生第二磨牙近中移动，导致磨牙后间隙增加。
Conclusion This reflects that the second molars could move mesially during treatment in the second premolars extraction subjects, which can lead to the increase of the retromolar space.
目的：观察不同根管锉预备根管及不同面充填物对前磨牙牙体抗折强度的影响。
Objective: to observe the effects of different root canal file and the restoration of occlusal surface on the fracture resistance of premolars.
结论前磨牙区的分角投照根尖片和平行投照根尖片均能精确反映牙齿的实际长度。
Conclusion Both periapical films in bisecting Angle technique and in distant paralleling technique can reflect the real teeth length precisely in premolar area.
目的：研究牙隐裂的磨牙及前磨牙的临床表现，探讨发病原因及不同的治疗方法。
AIM: To study the clinical manifestation of the molars and premolars of cracked teeth, and explore the cause of episode and the different treatment method.
目的探讨前磨牙区分角投照根尖片和平行投照根尖片在评价牙齿长度方面的差异。
Objective To investigate the differences of periapical films in bisecting angle technique and in distant paralleling technique on evaluation of tooth length.
目的观察热休克蛋白（HSP）70在前磨牙成牙本质细胞表达的增龄变化特点。
Objective To evaluate age-related changes in expression of HSP70 in odontoblasts of bicuspid teeth.
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).
结果牙根纵裂好发于40岁以上年龄，以磨牙及前磨牙较为多见，均伴有牙周损害。
Results the predilection age of VRFs was over40 years old, the predilection teeth of VRFs were molars and premolars, and most teeth with VRFs had periodontal lesions.
近年来，作者采用玻璃纤维桩进行前磨牙牙体缺损的修复，取得了良好的临床效果。
Conclusion: The defect treatmen of glass fiber post in a single premolar tooth root canal can achieve satisfactory results.
评价不同牙体剩余量对石英纤维桩复合树脂核全冠修复下颌前磨牙抗折性能的影响。
To evaluate the effects of the different amount of residual tooth on the fracture resistance ability of lower premolars restored with fiber quartz-fiber post-core and full crown.
结论根管治疗后用光固化树脂充填前磨牙的各类洞，牙体的抗折强度优于用银汞充填者。
Conclusion the fracture strength of premolar teeth filled with light curing composite resin was higher than filled with amalgam after root canal therapy.
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。
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。
Objective:To compare the changes in third molar position in patients treated with second molar and first premolar extractions.
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