牙骨

METHODS: Three-dimensional finite element mandible model was established based on the CT scanning data. The mini-implant was implanted in the region between first mola and second premolar at 30°, 60° and 90° tilted mesiolly, and 30° and 60° tilted occlusally, respectively.

应用颌骨CT扫描图象建立三维有限元模型，在下颌第1磨牙及第2双尖牙间分别以牙合向30°，60°，90°，近中向30°，60°植入种植体，给以水平方向1.96 N 加载。

Methods Three groups of patients,the first group place implant generally,the second groupuse Osteotome technique and Sinus floor elevation combined with implant placement,the third group use Osteotome technique and Sinus floor elevation,second time place implant after it be cured,calculate success rate.

方法三组患者，第一组常规行种植体埋入，第二组骨挤压法行上颌窦底提升术同期埋入种植牙，第三组行上颌窦底提升术后二期埋入种植牙。统计种植牙的存活率。

Paleoanthropologist David Strait of the University at Albany in New York state and his colleagues found that A. africanus evolved jaws, teeth, and a face that would have been particularly good at withstanding large forces on its premolars—precisely the place where humans and other primates crack large objects, such as nuts that are too big to chew with our molars.

纽约州奥尔巴尼大学古人类学家戴维·斯特雷特和他的同事发现，南方古猿非洲种的颌骨、牙齿和脸经过演化，其前磨牙特别擅长经受极大的力气——人类和其他灵长类动物恰好就用前磨牙来咬碎像坚果一样的大块食物，大到我们的磨牙无法咀嚼。

As the permanent tooth germ in the jaw with growth, development and direction to the dental occlusal surface of the mobile, so that the roots of deciduous teeth being absorbed, the gradual loosening of deciduous teeth, and finally resulted in loss.

由于恒牙牙胚在颌骨内的生长、发育及向牙齿咬合面方向的移动，使乳牙根部组织被吸收，乳牙逐渐松动，最后造成脱落。

The static loads were simulated according to the restored and unrestored situation. The stress distribution and stress level of the second molar was recorded.

并在修复前对两个基牙加载，修复后对固定桥进行加载，观察第二磨牙牙槽骨的应力分布变化情况。

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。

RESULTS: No reparative dentin was formed after 3 days of post-operation. The new-formed reparative dentin and osteodentin were observed after 15 days.

结果：术后3d未见修复性牙本质形成。15d后可见修复性牙本质形成，并可见骨样牙本质。

In this study, the pontic width was designed to three types: normal, one third width reduction, and one second width reduction. We developed the pontic reduction model based on the primary model in the first part of this paper. Two kinds of force condition were simulated.

在论文第一部分所建立的下颌后牙固定桥三维有限元计算模型的基础上，建立五种不同牙槽骨高度水平的基牙的固定桥减径模型，模拟两种固定桥典型受力状况进行计算分析。

Their BMD of anterior aveolomaxillary bone in five set sites were measured with Digoro computerized dental roentgenographic.

采用法国产Digoro电脑牙片机多点测定30 6例18～6 5岁正常成年人的上前牙牙槽骨骨密度值。

Butments in these cases were without pain, loosening, periapical diseases and alveolar resorptions.

对41个基牙复查结果显示，基牙没有叩痛，松动，根尖周病变及牙槽骨吸收等反应。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。