牙

Our study broke through the traditional method of treating alveolar cleft with bone grafting. According to the characteristics of DO, transport disk was used to close the cleft and stimulate the new bone deposition behind it.

本研究旨在突破传统牙槽突植骨术治疗牙槽裂的思路，根据牵引成骨技术的特点，实验采用输送盘关闭裂隙，同时刺激新骨产生。

The patients have used their full dentures for 1—3 months .(2) With the use of transcranial color Doppler analyzer the blood flow in the brain was measured before and 10 minutes after mastication in 17 subjects .

应用经颅彩色多谱勒超声扫描仪(Transcranial Color Doppler ，TCCD)探测牙列完整受试者及无牙颌患者在安静状态下和咀嚼无糖口香糖10分钟后脑血流速的改变，对大脑中动脉收缩期峰流速(systolic peak flow velocity ，Vs)、舒张期末峰流速(enddiastolic peak flow velocity ，Vd)、平均峰流速(mean peak flow velocity ，Vm)进行统计分析。

Beautiful, natural, life-like: the lack of transparency within the crown, you can block the death and severe dental pulp color tetracycline teeth color, this is the cast-ceramic crowns can not do.

美观、自然、逼真：内冠不透明，可以遮挡死髓牙和重度四环色牙牙色，这是铸瓷冠不能做到的。

2The density of human teeth is approximately among 1.20-1.40+103kg/m3. The density of crown is higher than that of root with significant difference.

人类牙的密度值恒定在一定范围之内，约在1.20～1.40×10~3kg／m~3之间，且牙冠密度值明显大于牙根密度值。

Each consists of a crown above the gum and one or more roots below it, embedded in the jaw.

每颗牙有一个在牙龈之上的牙冠和牙龈之下的一个或多个牙根，固定于颚中。

gap by law easy to use, easy to grasp, apply to the relatively high crown boneless resistance, resistance to a small adjacent teeth, the roots for the integration of the root or the root bifurcation cases, such as low lower the removal of impacted wisdom teeth; split crown law Requirements, flexibility in operation, more suitable for medium and low impacted significantly ditch and development, the root fork or a higher resistance to a larger adjacent teeth, and other cases, the lower-third-molar extraction.

结论增隙法操作方便、易于掌握，比较适用于高位、冠部无骨阻力、邻牙阻力小、根部为融合根或根分叉很低等情况下下颌阻生智齿的拔除；劈冠法要求条件高、操作灵活，比较适用于中、低位阻生且发育沟明显、根分叉较高或邻牙阻力较大等情况下下颌阻生智齿的拔除。

Brush the tongue palatal surfaces of anterior teeth with the same rotational movement, dental arch stenosis toothbrush can be vertical, part of the hair bundle pressure in the gums, teeth gap down to the crown side pull brush, and pull the grit one s teeth brush teeth after occlusal surface.

刷舌腭前牙表面具有相同的旋转动作，牙弓狭窄牙刷可以垂直，在牙龈头发束压力的一部分，牙齿缝隙，向冠方拉刷，并拔出咬牙刷牙在咬合面。

In this paper, a simple method and procedure is given by which cone radius, journal angle, diameter and leg datum point size of a rock bit can be calculated respectively according to geometric relations of rock bit structure parameters.

本文给出一种根据牙轮钻头结构参数间的几何关系分别计算牙轮半径，牙爪轴倾角，牙掌基准尺寸，牙轮背锥角和钻头直径的方法及程序。

The heritability of maxillary arch length (71.26%) was higher than the mandibular one (31.33%). The intraclass correlation coefficients were similar in dental crowding between MZ and DZ, with the lower in DZ. Low heritability of dental crowding was found in both maxillary (4.73%) and mandibular (10.3%) teeth. Conclusion The maxillary teeth MD, the mandibular teeth MD and the length of maxillary dental arch are controlled under strong genetic factors.

上下颌牙量遗传度较高，上颌为69.97%，下颌为75.73%；上颌牙弓弧长的遗传度(71.26%)明显高于下颌(31.33%)；单卵双生子和二卵双生子上下颌牙齿的拥挤度的对内相关系数较为接近，二卵双生子略低，遗传度很低，上颌为4.73%，下颌为10.3%。

In this paper,the threshold of the automatic control system for the synchronous differential lock of off road vehicle is analyzed.With the cornering model of a three-axle vehicle,the response limit of the system is analyzed theoretically.Through the analysis of the mechanical strength and the engaging characteristics of the dog clutch,the maximum difference of rotation speed between two parts of the dog clutch and hence the upper activation limit of the system are calculated

本文阐述了越野汽车差速器同步锁止机构自动控制系统的组成和工作原理，分析了其控制门限；利用所建立的三轴汽车转向行驶运动模型，在理论上确定了越野汽车差速器同步锁止机构自动控制系统的响应界限；通过对同步锁止机构牙嵌式离合器强度和接合特性的分析研究，确定了牙嵌式离合器允许的最高转速差，从而确定了动作限值的上限

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失