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.
目的：建立人上颌第二磨牙三维有限元模型。
Objective: the three-dimensional finite element method models of the maxillary second molar was constructed.
目的：探讨上颌第二磨牙错？畸形的种类及相关因素。
Objective: to investigate the type of upper second molar malocclusion and its related-factors.
统计上颌第二磨牙错？畸形的患病率、分类及临床表现。
The prevalence, classification and clinical manifestation of upper second molars malocclusion were analyzed.
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.
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.
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.
阿稀溶液5 - 10毫升次氯酸钠不慎注入上颌窦根管治疗期间的右上第二小臼齿(5)。
A dilute solution of 5-10 MLS sodium hypochlorite was inadvertently injected into the maxillary sinus during root canal therapy of a right upper second premolar (5).
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.
上颌第三磨牙和上颌尖牙分别是第二及第三常见的部位。
The maxillary third molars and maxillary canines are the second and third most common areas of occurrence, respectively.
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.
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.
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.
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.
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