牙

The teeth and carry it in its paper strength should be unanimous, Zhang arterious into accurate, between two teeth, handing over paper, there must be enough of a total of between one time to ensure that effective control of the paper, the drum and dental axis to ensure that no movement.

各叼纸牙叼辛给平均不合歧，弛闭进间不确，两牙移交纸弛时，给有不足的共叼工夫，包管不差纸弛的灵验把持，另边各滚筒及牙轴给包管无窜不静本体。

Methods:Select 11～18 year old patients with bimaxillary protrusion 20 cases were randomly divided into two groups:TPA group,TPA＋Nance arch group.Two cases are the uprooting of four first premolars,the use of straight wire appliance technology,one step closure extraction gap analysis before and after treatment lateral skull X ray film and dental cast changes in the indicators.

选取11～18 岁双颌前突患者20 例，随机分为：TPA与TPA＋Nance弓两组；两组病例均拔除4个第一前磨牙，使用直丝弓矫治技术，一步法关闭拔牙间隙，分析治疗前后X线头颅侧位片及牙颌模型的各项指标变化。

The famous manufacturer of Bluetooth consumer products, Bluetrek has recently introduced its new Bluetooth gadget, named as Bizz, which the company claims as the world's first 3-in-1 bluetooth headset, combining a functionality of USB flash drive and direct charge via USB 2.0, as what you see in the picture.

著名的制造商，蓝牙消费产品， bluetrek最近推出了新的蓝牙小工具，命名为bizz ，该公司声称，作为世界上第一个3合1蓝牙耳机，结合了功能， USB闪存驱动器和直接负责通过USB 2.0接口，正如你在图片中看到的。

Mesiodistal and buccolingual crown diameters measured on models were statistically analyzed using the SAS software package.

第二磨牙和第三磨牙是萌出最晚的牙齿，其牙冠宽度的预测，国内外报道很少[2 ，3 ] 。

The pathogenesis of root resorption is still not clear. Cementoblast plays a central role in repair root resorption by synthesizing cementum matrix.

成牙骨质细胞是牙骨质的功能细胞，在牙根形成、牙周病牙骨质的再生以及正畸相关炎性牙根吸收的修复中起着重要的作用。

During the development of dental germ, enamel matrix proteins secreted by epithelial root sheath could induce dental follicle cells to differentiate towards cementoblast and form acellular cementum finally on the surface of tooth root. Many researches of domestic and oversea scholars suggest that enamel matrix proteins could effectively induce periodontal regeneration, and the structure and function of this regenerated tissue are similar to healthy periodontal tissue. Moreover, the regeneration process is nearly the same to that of embryonic development of periodontal tissue.

自发现釉基质蛋白可诱使牙囊细胞向成牙骨质细胞方向分化并在根表面形成无细胞性牙骨质以来，国内外学者做了大量研究，结果表明釉基质蛋白能有效诱导牙周组织的再生，且这种再生组织的结构和功能更接近于健康的牙周组织，并且再生过程也与牙周组织的胚胎发育过程类似。

However, it is not known how orthodontic force influences the function of cementoblast and what is the relationship between the function change of cementoblast with root resorption. So we studied the effect of mechanical stimuli on root resoption by examining the expression OPG and RANKL and exploring the related signal transduction pathway in cementoblast. Methods: Cementoblasts OCCM30 were cultured in DMEM with 10% FBS for 48 hours and starved in DMEM with no FBS for 24 hours, then subjected to mechanical strain by four-point bending system with tension and compression stress at 2000μstrain at 0.5Hz frequency. The flow cytometry was used to examine the cell cycle and proliferation activity after 3h, 6h, 12h, 24h loading respectively. OPG and RANKL mRNA were analysed with real time quantitive RT-PCR after the same loading period as FCM.

本课题利用四点弯曲力学加载系统，采用流式细胞术、实时荧光定量PCR、Western免疫印迹等方法，研究体外培养的成牙骨质细胞株OCCM-30在不同力学环境中增殖活性的变化，以及其表达骨保护素和破骨细胞分化因子的mRNA的变化，探讨应力刺激对成牙骨质细胞表达破骨细胞分化调控蛋白的影响，并通过对应力刺激下成牙骨质细胞分裂原活化蛋白激酶家族中的ERK1/2、P38MAPK活性的变化及其与OPG、RANKL基因表达变化关系的研究，对力学刺激调节破骨细胞分化调控蛋白的相关上游信号转导通路进行初步探讨。

Objective:To observe the differences of bone mineral density of mandible and coxofemoral region between well-rounded ridge group and atrophied ridge group in edentulous patients,and to find the risk factors contributing to severe residual ridge resorption.

目的：观察无牙颌患者剩余牙槽嵴丰满组与非丰满组间下颌骨和髋部骨密度的差别；探讨导致严重剩余牙槽嵴吸收的危险因素。

Results:Atrophied ridge group had lower bone density of mandibular angle and coxofemoral region than well-rounded ridge group and dentate controls; Well-rounded ridge group had lower bone density of mandibular angle than dentate controls,but there was no difference of BMD of coxofemoral region between these two groups.

结果：非丰满组下颌角和髋部骨密度显著低于丰满组和有牙颌对照组；丰满组髋部骨密度与有牙颌对照组差异无显著性，下颌角骨密度则显著低于有牙颌对照组。

①The shape of the tubular openings has a corelation with both the arrangement of the dentinal tubules and their opening sites on the calcospherites.

①牙本质小管口的形态与牙本质小管的走向及其在钙球上的开口的形态与牙本质小管的走向及其在钙球上的开口部位有相关关系。

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