查询词典 maxillary

MB1 root canals of the mesiobuccal root canals in maxillary molars were found obvious curve out by the rate of 82.5% in mesiodistal direction,77.5% in buccoling

上颌第一恒磨牙四个根管在近远中方向、颊舌方向均有不同程度的弯曲，其第二弯曲出现的情况也各不相同。

Maxillary second molar has five subtype, Type A: absence of root fusion, Type B: presence of mesiobuccal and distobuccal root fusion, Type C: palatal root with anyone of buccal root fusion of molar with three roots, Type D:complete root fusion of molar with three roots, Type E:pseudofusion of molar.

分析其牙根发育沟之发生率、牙根发育沟之长度、牙根发育沟至牙骨质牙本质交界的距离，以及牙根发育沟最深点的深度、占牙根长的位置、与到牙根根管的距离，并且将牙根分类为上颚第一大臼齿，仅一种分类。

Oral Surg,1971,32∶271-275［2］ Weine FS,Healy HJ,Gerstein H,et al.Canal configuration in the mesiobuccal root of the maxillary frist molar and its endodontic significance ［J］. Oral Surg Oral Med Oral Pathol,1969,28∶419-425［3］ Weller RN,Hartwell GR.

本研究通过对80例离体上颌第一磨牙行近远中方向，颊舌方向x 线投照，旨在近一步了结其根管的弯曲走向，弯曲程度，弯曲位置。X线片只能反应根管在一个平面上的走向、形态。

Methods One hundred and fifteen extracted maxillary first premolars were included in this study. Radiograph of teeth in mesiodistal direction was taken.

收集115颗离体的上颌第一前磨牙，拍近远中向的X线片，用Photoshop5.0软件分析根管，用Weine氏法测量根管的弯曲度，测量的角度大于 18°时，则认为根管存在明显的弯曲，根管的构型采用Vertucci分类法。

The position changes of mandibular molars were measured from mesiodistal direction and vertical direction, and the implant anchorage loss was evaluated by maxillary central incisor.

通过测量下颌第二磨牙在近远中方向、垂直向的位置变化，以衡量磨牙的位置改变。并通过下颌中切牙的位置变化，评价支抗强弱。

The clinical characters of oligodontia concluded from this study are following:(1) There is significant difference that more teeth absent and more existent teeth anomalies in patients of oligodontia/S group than in patients of oligodontia/I group, and the peg-shaped upper lateral incisor is the most frequently affected teeth with shape anomaly.(2) Both of the two groups have no significant differences in number of teeth missing between maxilla and mandible as well as that between left and right side.(3) The distribution of teeth missing is bilateral symmetry in both groups, but the frequency of teeth lost are different: excluding the third molar, in oligodontia/I group, the lower second premolar is the most frequently congenitally missing tooth followed by the upper lateral incisor, while in oligodontia/S group, the most frequently missing teeth are mandibular canine and maxillary lateral incisor. Nevertheless, the first molars are the most stable teeth in both groups.(4) In oligodonita/I group, the mean mesiodistal dimensions of all type of existent teeth are significantly smaller than normal value. It is implied that oligodontia is not an isolated phenomenon, but is related to a complex of other dental changes.

对于口腔多个恒牙先天缺失的临床特点有以下初步结论：(1)综合征型先天缺牙患者较单纯型先天缺牙患者恒牙缺失数目更多，平均分别为23.9个和14.9个，且现存牙齿有更多的形态异常，分别为7／10例（70％）和6／22例（27.3％），其中最常见的是上颌侧切牙畸形；(2)两种类型的多个恒牙先天缺失患者的缺牙数目在上下颌及左右侧之间均无差别；(3)两种类型的多个恒牙先天缺失患者在缺失牙位上均呈对称分布，但在具体牙位上有所差异：不计第三磨牙，单纯型先天缺牙最常缺失的牙位是下颌第二双尖牙、其次为上颌侧切牙；而综合征型先天缺牙最常缺失的牙位是下颌尖牙和上颌侧切牙；无论何种情况，第一磨牙均为牙列中最稳定的牙齿；(4)在单纯型先天缺牙患者中，现存恒牙的牙冠宽度较国人正常值偏小，差异显著，提示牙齿形态与多个牙先天缺失有一定相关性。

METHODS:Fifty two permanent maxillary first molars,which were diagnosed as pulpitis and periapical periodontitis clini cally,were selected.The pulp chamber floors were examined and detected to locate the mesiolingual canals(MB2) by naked eyes and SOM respectively.

由于其近颊根通常有近中颊和近中舌(MB2 ) 2个根管，而其近中舌根管细小且根管口常较为隐蔽，因此，Weine认为上颌第一恒磨牙根管治疗失败的一个主要原因是治疗中遗漏了MB2根管。

In my study, a three-dimensional finite element model of human cranial-maxillary complex osteodistraction was established. The stress distribution and displacement under different loads were evaluated. The experiment results were feasible and effective to the stress analysis in the process of orthodontic and orthognathic treatment.

本实验通过建立颅上颌复合体三维有限元模型，分析上颌骨LeFort Ⅰ型截骨后牵张成骨的生物力学特性，明确在不同牵引方向时上颌骨复合体各部位的应力分布特点及位移趋势，为临床改良和优化颅面部牵张成骨的治疗方案提供一定的参考依据。

The objects of this research were AngleⅢmalocclusion osteal cross bite patients who were treated by maxillary protraction therapy combined with rapid palatal expansion in the Department of Orthodontics, Stomatological College of FMMU, and they were divided into three different groups by age: the 3～6 years group, the 7～10 years group and the 11～13 years group.

本研究以在第四军医大学口腔医院正畸科行上颌前方牵引联合上腭快速扩大治疗的安氏Ⅲ类骨性反牙合病例为研究对象，并按年龄将其分为3～6岁组、7～10岁组、11～13岁组。

Through comparing and analyzing the photographs of Cephalometrics before orthodontics, after orthodontics and two years after orthodontics, we can probe into the optimal period for treating AngleⅢmalocclusion osteal cross bite patients with maxillary protraction therapy and the long period of stability after the accomplishment of orthodontics, and it can provide reference and theoretics for clinic practice and experiments.

通过对不同年龄组患者矫治前、矫治结束时及矫治结束两年后的头颅侧位片进行定点、描绘、测量、比较分析，进而探讨上颌前方牵引治疗安氏Ⅲ类骨性反牙合的最佳矫治时机以及矫治结束后的长期稳定性，为进一步的临床实践与实验研究提供理论依据。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐