颌

Methods This study selects 17 bimaxillary protrusions adolescents and contrast 8 hard-tissue controls before and after orthodontic treatment with Paired t Test to evaluate the changes in maxilla, mandible and SN.

对17名青少年双颌前突患者拔牙矫治前后的8项硬组织指标进行对比，通过配对t检验来评价治疗后患者上颌骨、下颌骨及前颅底的生长变化。

There are no changes in development directions of maxilla,mandible and SN before and after orthodontic treatment for bimaxillary protrusion抯 adolescents with four premolars extracted,but there are different in development rate,the development of mandible is the fastest, maxilla is slower, SN is the slowest.

可以认为青少年双颌前突患者拔牙矫治前后上颌骨、下颌骨及前颅底的生长方向在治疗前后无变化，但三者的生长速度不同，下颌骨生长最快，上颌骨较慢，前颅底的生长速度最慢。

Objective To study the changes in maxilla,mandible and SN after orthodontic treatment with four pre－molars extracted in bimaxillary protrusion in adolescents and provide clinical useful data for predicting curative ef－fect after orthodontic treatment.

目的：研究青少年双颌前突患者拔牙矫治前后上颌骨、下颌骨及前颅底的变化，为临床预测矫治后疗效提供临床依据。

There are no changes in development directions of maxilla,mandible and SN before and after orthodontic treatment for bimaxillary protrusion抯 adolescents with four premo－lars extracted,but there are different in development rate,the development of mandible is the fastest, maxilla is slower, SN is the slowest.

可以认为青少年双颌前突患者拔牙矫治前后上颌骨、下颌骨及前颅底的生长方向在治疗前后无变化，但三者的生长速度不同，下颌骨生长最快，上颌骨较慢，前颅底的生长速度最慢。

Bimaxillary protrusion extraction cases, the application implant anchorage appliance, the incisor root resorption evident.

双颌前突拔牙病例，应用种植支抗矫治后，切牙牙根吸收明显。

He bridled up when his enemy spoke to him.

敌人对他说话时，他昂首收颌以''。

At the front of their bulbous blue heads they have curved fangs that act as jaws.

在他们蓝色球根状的头前面有一个弧形状的牙，那个就是颌骨。

Diagnosis: The first Mesozoic bird found in Hebei Provicne. Different from Confuciusornis by smaller size, sharp teeth, well-developed sternum, carpometacarpus unfused and three wing claws present.

基本特征：是河北省发现的第一块中生代鸟类化石，它与孔子鸟不同之处有，个体较小，颌骨有锋利的牙齿，胸骨发育，腕掌骨不愈合，指骨仍有三个指爪。

The treatment of mandibular fractures is advantaged by using titanium-miniplates, increased in the reliability of catagmatic fixation, reduced in the limit of interaxillary fixation, and retained in the facial shape of patients.

所有患者钛板均未取出。结论微型钛板内固定具有良好的稳定性，缩短了颌间固定的时间，可早期恢复张口运动，对骨折线上牙齿可以保留，是一种较好的下颌骨骨折内固定方法。

The using of cephalogram is limited because of the structure overlapping of the skull, jaw and teeth, for example the overlapping of the right side teeth and the left side make it difficult to distinguish the landmarks of posterior teeth.

颅颌骨牙齿之间影像的重叠使头颅定位x线片的应用受到了限制，比如牙列的重叠使后牙区的标志点难以辨认，所以对牙列的研究要借助牙〓模型。

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