牙

RESULTS:①There was higher tensile stress at the ingual side of symphysis, inside of molar and outside of condyle under the impact of chin.②There was higher tensile stress at the lingual side of symphysis, inside of contralateral molar, outside of contralateral angle, outside of homolateral angle and inside of homolateral body under the impact of body.③There was higher tensile stress at the inside of angle, inside of homolateral condyle, lingual side of symphysis, outside of contralateral condyle and inside of homolateral molar under the impact of angle.

结果：①撞击颏部，其舌侧区，磨牙后区内侧面、髁状突颈外表面以及下颌角外表面具有较高的张应力；②撞击下颌体部，颏部舌侧区，对侧磨牙后区内侧面、对侧下颌角外表面、撞击侧下颌角外侧面、撞击侧体部内侧面具有较高的张应力；③撞击下颌角，其内侧面、撞击侧髁状突颈内侧面、颏部舌侧面、对侧髁状突颈外表面以及撞击侧磨牙后区内侧面具有较高的张应力。

Methods: 62 cases with anterior deep overbite were treated with a modified appliance which was composed of four parts-the anterior bite plate,the anchorage on the second molars,the rectangular wire with higher elasticity and intermaxilla traction.

该矫治方法由前牙平导板、高弹性方弓丝、第二磨牙设计支抗、后牙颌间垂直牵引等组成。结果：经临床应用2 年，共62 例，效果良好。平均疗程4 个月。

Methods We observed photographs of 30 implant-supported single crowns, used pink esthetic score standard to count scores according to the comparison of the adjacent tooth or the isonym tooth on the opposite side, and investigated the patients satisfaction rate on aesthetic effectiveness.

观察25例患者30颗单个牙种植义齿周围的软组织状况并与邻近牙或对侧同名牙相比较，用PES计分标准进行计分，并对患者满意度进行调查。

Base on the stress analysis, the model with unit of porcelain to metal at the labiocervical margin is better than the models with porcelain or metal only at labiocervical margin for upper central incisor restoration.

从受力分析的角度而言，金属颈环型设计适应于前磨牙和后牙的修复：瓷颈环型设计适应于前牙修复，而金-瓷混合颈环型设计则适应于任何形式的修复体。

The expression of CD44 was strong positive in stratum intermedium at the bell of differetiational stage, bell of secretory stage, and bell of maturative stage of mouse tooth germ.

在钟状期CD44在口腔上皮、牙板上皮强阳性表达；外釉上皮、星网状层、成牙本质细胞弱阳性表达；分泌期的成釉细胞和牙囊阳性表达。

Res ults: The maxillary central incisor was similar to the maxillar y lateral incisor in stress distribution. The highest stresses were observed in the root surface, the liwest in the periodontal ligament, the alveolar bone between them .

结果：上颌中、侧切牙的应力分布基本相同；上颌中、侧切牙及其支持组织的应力分布不均匀，牙根部受应力最大，牙槽骨次之，牙周膜最小。

Methods The majority patients were Corrected with edgewise appliance after draw four molars, all sorts of flexure were curved on the appliance, used perpendicular traction for anterior teeth and II, III maxillomandibular traction, fine adjust intercuspal position ,tip and cavity.

多数患者采取拔除4个磨牙之后使用方丝弓矫治器矫治，矫治中在弓丝上弯制各种曲，并使用前牙垂直牵引和颌间Ⅱ类、Ⅲ类牵引，精调牙位及尖窝关系。

Results Maxillary first and second molars were more mesially inclined in the first group, particularly in the younger subjects (16～25 years).

用U检验对两组测量角度的平均值进行比较，Spearman 相关系数估计年龄因素的影响，用Logistic回归分析第三磨牙的萌出与第一磨牙、第二磨牙的轴倾度、性别和年龄之间的关系。

Results Maxillary first and second molars were more mesially inclined in the first group, particularly in the younger subjects (16～25 years).

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向近中倾斜，而且随年龄的增加倾斜度也变。

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