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.
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.
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.
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.
本文简要介绍下颌前磨牙多种解剖结构的形成、形态特点、人种差异、分型和研究方法。
This paper illustrated the characters about root canal morphology of mandibular premolars, including the formation, configurations, racial difference, classification and methods for study.
结论：山羊下颌无牙区及下颌第一前磨牙区可作为牵张成骨增高牙槽嵴新的实验动物模型。
CONCLUSION: the no tooth area and the first premolar area of mandible in sheep is a good experimental animal model for alveolar ridge augmentation by distraction osteogenesis.
结论：拔除下颌第二前磨牙后，第三磨牙萌出间隙明显增大，有助于下颌第三磨牙的正常萌出。
Conclusion: Mandibular second premolar after pulling, the third molar eruption clearance increased obviously, conduce to the jaw third molar normal eruption.
下颌第二前磨牙是最常见的缺失的牙齿，而上颌侧切是第二大。
Mandibular second premolars are the most frequently missing teeth while maxillary lateral incisors are second-most.
下颌第二前磨牙是最常见的缺失的牙齿，而上颌侧切是第二大。
Mandibular second premolars are the most frequently missing teeth while maxillary lateral incisors are second-most.
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