查询词典 decayed tooth

In a recent study, the researchers found that prolonged consumption of sports drinks may be linked to a condition known as erosive tooth wear, in which acids eat away the tooth's smooth hard enamel coating and trickle into the bonelike material underneath, causing the tooth to soften and weaken.

研究人员发现长期饮用运动饮料会导致腐蚀性的牙磨损，因为一些酸类会侵蚀牙齿表面光滑而坚硬的釉外壳并渗入内部的牙骨质，从而导致软化衰弱。

The technical characteristics of the invention is that: the rotor end face tooth profile contains four, five or six sections of tooth curves with the circular nature; when it has five sections, addendum circular arcs and dedendum circles are added to the addendum or the dedendum of the rotor; when it has six sections, both the addendum circular arcs and the dedendum circles are added to the addendum and the dedendum of the rotor at the same time, to form four different combination schemes; there are common tangents at the connection points of the two adjacent teeth forming curves, which has a smooth tooth-profile without cusp, a high-wearing feature, a long life of the rotor, a small leakage triangle, and a good sealing property.

本发明的技术特征是：转子端面齿型是包含四段、五段或六段圆弧性质的齿曲线；当为五段时，在转子的齿顶或齿根加上齿顶圆弧或齿根圆弧，当为六段时，在转子的齿顶和齿根同时加上齿顶圆弧和齿根圆弧，形成四种不同的齿型组合方案；相邻的两组成齿曲线的连接点处具有公切线，齿型光滑，没有尖点，耐磨性好，转子的使用寿命长，泄漏三角形小，密封性好。

Dealing with whether to keep or to rcmove activity tooth tissue valve of upper one third of rout diastema can be divided into experiment group and control group. Experiment group: keeping activity tooth tissue valve and restore it as told above. Control group: extracting activity tooth tissue valve. And then treat it in a routine way as root-canal therapy, restoration with baked-porcelain crown and metal crown.

对牙根上1/3纵裂的活动牙组织瓣的去、留分实验组和对照组，实验组：保留活动牙组织瓣，按上述方法修复；对照组：拔除活动牙组织瓣，常规根管治疗，桩钉固位，烤瓷冠或金属冠修复。

Using two-flank-staining method, inspect the tooth flanks of the driven bevel gear, 3 to 4 equispaced spots along the circumference, at each spot apply color to 2 to 3 teeth, the correct meshing print requirements are: print width in the direction of face width not less than 50% to 60% of the facewidth , and that in the direction of tooth depth not less than 40% to 50% of the tooth depth.

用两面着色法，在从动锥齿轮的齿面检查，沿圆周均布3-4处，每处2-3齿涂色，正确啮合印迹要求为：在齿宽方向的印痕宽度不小于齿宽的50%---60%，在齿高方向的印痕宽度不小于齿高的40%---50%。

Before machining, we can check the gear's tooth shape easily so as avoiding tooth's abnormity. We can measure tooth parameters, and get the figurate cutting tool's dimensions.

在加工之前，便可对齿轮副的齿形进行检查，防止齿形发生异常；可以测量齿形数据，以确定高速铣削用成形铣刀的尺寸数据。

Absctrct: Objective This study was designed to investigate the stress distribution in the surface of tooth and peridental tissues and the initial displacements of tooth in the maxillary under two orthodental simulating force rectangular archwire with T loop and II class elastic used clinically by the 3-D finite element method so as to clarify the biomechanism of orthodontic tooth movement and component of optimal orthodontic force system.

目的：通过有限元分析法比较两种工况下上颌各牙齿的位移趋势和牙根及牙周支持组织内的应力分布规律，为临床治疗中合理选用矫治力系统以便有效的控制牙齿移动类型提供可靠的理论依据。

Root canal treatment or endodontics is used to save the tooth when the dental pulp (blood vessels and nerve in the centre of the tooth) dies and the tooth becomes infected.

根管治疗或牙髓是用来保存牙齿时，牙髓（血管和神经在该中心的牙齿）去世和牙齿，成为感染。

Tiger tooth namely canine teeth, be top two single sharp tooths of the Han, at the age of 23 outwardly Pi, be like the tooth of tiger quarrel very much, so call "tiger tooth".

虎牙即犬齿，就是上颌的两颗单尖牙，在十二三岁时向外毗出，很像老虎口角的牙齿，故谓&虎牙&。

Clinical medium usually run into some serious tooths week the tooth row of patient's defection and damage, its artificial teeth repairs an opposite difficulty, can choose a cone form set tube hat artificial teeth, even if tooth week blaze a patient the tooth row only remain 1~5 natural tooths, can also repair.

临床中常常碰到一些严重的牙周病患者的牙列缺损，其义齿修复相对困难，可选择圆锥形套筒冠义齿，即便牙周炎病人牙列仅剩1~5颗天然牙，也可修复。

Mouth cavity health inspection:Carry on a mouth cavity health inspection every half year, adopt a super voice Jie tooth the machine carry on 2-3 whole Jie tooths annually and make the tooth noodles, tooth neck usually been placed in clean appearance.

口腔健康检查：每半年进行一次口腔健康检查，采用超声洁牙机每年进行2－3次全口洁牙，使牙面、牙颈部经常处于洁净状态。

Now he worked in ajoint venture.

现在他在一家合资企业工作。

More troops in Afghanistan won't change any of the foregoing.

更多的在阿富汗的军队也不会改变之前的状况。