下颌前的

Three cross-sections were made through crown and gingiva of the model tooth. Curve functions of axial buccal crown and gingiva contour of each section were acquired by means of curve fitting, and the angle of emergence pofile was calculated, which represents the degree of undercut.

以下颌第二前磨牙为研究对象，在牙列模型上通过牙冠部、牙龈作3个纵断面，用曲线拟和的方法得到每个断面的牙齿轴面外形及相应牙龈外形的曲线方程，以此分析两者之间的关系并计算牙冠起始外形角度，即倒凹程度的大小。

Besides the traditional contents of oral surgery, such as extraction of teeth, alveolar surgery, preprosthetic surgery, TMJ disorders, jaw injuries and salivary gland diseases, additional sections such as microvascular surgery, cosmetic surgery, plastic and reconstructive surgery, head and neck tumour surgery, and Traditional Chinese Medicine are also appurtenant parts of typical oral and maxillofacial surgery of China.

其所涉及的学科领域和内容较西方一些国家更广，除传统的口腔外科——牙及牙槽外科、修复前外科、颞下颌关节病、颌面损伤、唾液腺疾病等外，还包括了颌面整复外科、显微外科、头颈部肿瘤外科等内容，而且还有独特的传统医学——中医学的结合及参与，形成了具有中国特色的口腔颌面外科学。

Objective To investigate the stress intensity and distribution in the dentine of intact endodontically treated mandibular second premolar under three different restorations.

目的采用3种不同的设计方式修复根管治疗后牙冠完整的下颌第二前磨牙，观察其牙本质的应力大小及分布情况。

There was 100% correlation between the position of the mandibular angle in the preoperative standing lateral radiograph and the intraoperative supine lateral radiograph, compared with 65% with the hyoid bone.

术前站立位颈椎侧位X线片与术中的仰卧位颈椎侧位X线平片之间下颌角位置的关联性为100%，相对应的是舌骨为65%。

There is aslight prominence of thenasalbone structure causing a slightly Romanappearance, the centerlinerunning up over the foreface with little orno stop, falling awayinfront of the eyes so there is an absolutelyclear outlook withnointerference; the underjaw showing great strength,the jaws longandpunishing; the mouth level, meaning that the teethfrom the upperjawand lower jaw match evenly, neither overshot norundershot.

轻微突起的鼻梁骨，形成了罗马面貌，其中心线沿着前脸上升到轻微的止部，消失在眼睛前面，所以视线清晰，没有任何冲突，下颌显得非常有力，颌部长而强烈；嘴巴为钳状咬和，上下颚牙齿均匀匹配，完全对齐，无上颚突出或下颚突出。

Most Angle class two division one subdivision malocclusion with mandibular retrusion have their characteristic condylar movement style, the difference from that of normal occlusion maybe correlate to condylar position, overbite and overjet.

下颌后缩型安氏Ⅱ类1分类错牙合的髁突运动轨迹有较典型的特征，可能与其髁突位置、前牙覆牙合覆盖有关。

METHODS: As a pilot study, we prospectively evaluated 30 consecutive patients who underwent anterior cervical diskectomy and fusion to assess the interobserver accuracy of palpating the mandibular angle, hyoid, carotid tubercle, and thyroid and cricoid cartilages.

作为先导研究，我们前瞩性的评估连续30例行椎间盘切除并融合术的病人，评价触摸下颌角、舌骨、颈动脉结节、甲状软骨和环状软骨时目标观察物的准确度。

Methods: Twenty five patients with congenital missing of one or two incisors, 17 patients were treated with extraction, 5 patients were treated orthodontically and prostbodontically. 3 patients were treated with slenderizing to solve crowding and adjust median line and Bolton index.

25例先天缺失下颌个别前牙1～2颗的患者，其中17例采用减数方法进行矫治，5例集中间隙，结合修复进行治疗，3例结合邻面去釉、改变牙轴等手段解除拥挤，采用调整中线和Bolton指数的方法进行矫治。

Methods:Thirty extracted mandibular first premolars with only one root canal and root-canal curvatures between 13° and 38.5° were divided into three groups.

材料与方法：选用山东大学口腔医学院口外门诊拔除的下颌第一前磨牙(单根管、根管弯曲13°～38.5°)。

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