牙骨

Methods:Twenty-three tooth of 19 patients were examined by using ProMax lateralal sagittal axial panoramic tomographs before the teeth were extracted or orthodonted to assessment location and shape of dental root.

随着影像学检查技术的发展，全景机的操作性能及程序化控制水平明显提高，可进行多种部位投照[1]。ProMax数字化X光机可以投照颌骨牙列断层片。

Among these traits is the tooth, which consists of two characteristic mineralized tissues, a highly mineralized surface layer (enamel in tetrapods and enameloid in fish) and a softer body, both supported by basal bone.

牙齿的变化便是其中之一，牙齿由两种典型的矿化组织组成：即高度矿化的表层（四脚动物的釉质和鱼类的釉质瘤结构）和相对较软的牙本质，下方的基骨起支持作用。

Methods: Three-dimensional finite element was adopted to compare stress and displacement on osteotome-bone interface at the different shapes of top osteotomes top at osteotome sinus floor elevation.

Summers提出的&骨挤压上颌窦提升术&(osteo-tome sinus floor elevation，OSFE)，由于手术创伤小，术后反应轻，患者易于接受，已逐渐地被临床应用于上颌后牙缺失的种植体植入术中[1~5]。

Objective To evaluate the effect of using rapid maxillary expansion accompanied with straight wire appliance on dental arch and basal bone.

目的评价快速上颌扩弓和直丝弓矫治器联合使用对牙弓、基骨宽度的影响。

Study on the characteristics of DMP1 and Cbfal expression in bone development and mineralisation.

牙本质基质蛋白-1及Cbfal在骨与软骨组织内的表达特征研究。

After a tooth is extracted, due to the lack of occlusive stimulation, the absorption of the remains of alveolar ridge shows an irreversible process, due to the imbalance of the bone formation.

牙齿拔除后，由于缺乏正常咬合力的生理性刺激，剩余牙槽嵴的吸收表现为一个持续、不可逆的过程，这是由于骨形成与吸收的不平衡造成的。

Results Of the 48 successful cases,after 3～36 months following-up,bilateral high lip equal,bows and restore the natural shape and function of the upper lip,for a fractured alveolar ridge gradually converging on the jaw and the development of satisfactory results.

结果 本组48例患者，术后随访3 月～3年，双侧唇高相等、唇弓形态自然并恢复了上唇的功能，促进了牙槽嵴裂隙的逐渐靠拢和上颌骨的发育，效果满意。

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％。