臼齿

Congenital missing of one or both of the maxillary incisors is the second most common form of tooth agenesis.

上颚侧门齿先天缺失是仅次於第三大臼齿最常见的牙齿缺失。

In cultured primordia, molar and incisor tooth germs can easily be distinguished by their appearance and their gene activity, although other shapes found in the human mouth, such as premolars and canines, are more difficult.

在组织培养的牙齿原基里头，可以从外观和基因的活性，轻易分辨出臼齿与门齿的牙胚，不过，人类口腔里的其他牙齿，像是前臼齿与犬齿，就比较难以区分。

Did you notice the black spot on my right molar.

有。你有留意到我右边臼齿有一黑点吗？

The most common torque need in the upper molars is the need for additional buccal root torque.

最常见的扭矩需要在上臼齿是需要额外的颊根扭矩。

Carnassial : Last premolar of upper jaw, first molar of lower jaw.

裂齿 ：上颚最后的一只前臼齿，下颚最前的一只臼齿。

Unfortunately, the fourth premolar in the upper jaw is quite large and looks like the first molar in the lower jaw; it is known as a carnassial tooth.

不幸的是，上颚的第四颗前臼齿很大，看起来就象是下颚的第一颗臼齿，这颗前臼齿也被称作叫裂齿。

A case report was presented with a female patient of class II malocclusion, bimaxillary dentoalveolar protrusion with space deficiency. Bilateral lower left second molars were mesially inclined impactions with large caries. The lower left second molar was diagnosed with acute apical periodontitis.

本文提出一双颚齿槽前突合并齿列拥挤之安格氏二级咬合不正之女性患者，其下颚两侧第二大臼齿为近心倾倒之阻生齿合并龋齿，而左下第二大臼齿之龋齿已侵犯到牙髓而有急性根尖牙周炎的情况。

We present the case of an 11y/o girl with skeletal Class II but high mandibular plane angle, severe crowding, rotated upper first molars, and Class II dental malocclusion. Four first bicuspids extraction with a fixed appliance orthodontic treatment was undertaken.

最常被用来改正上颚大臼齿的去旋转装置就是跨颚弧线(transpalatal arch， TPA)，但是由於该装置作用范围较小对於不当旋转较大的上颚大臼齿将不易置入，且会产生过大之施力与力矩。

The mean distance of CEJ-FEs at the buccal, mesial and distal furcations of maxillary molars were 3.42 ± 1.5mm, 3.55 ± 0.97mm, and 3.69 ± 0.98mm for the first molars, and 3.01 ± 1.04mm, 4.04 ± 1.58mm and 3.00 ± 1.14mm for the second molars.

上颚第二大臼齿的颊面、近心面与远心面之平均根叉角度分别是91.56±11.72 ； 101.65±11.45 ； 97.11±10.71。下颚第二大臼齿的颊面与舌面平均根叉角度分别是93.32±11.51 ； 91.72±10.77。

From each side, in the lower jaw,(1) is the canine,(4) the small premolars,(1) the large molar, and (2) the smaller molars.

而在两边的下颚处，各有（1）颗犬齿，（4）颗小前臼齿，（1）颗大臼齿，以及（2）颗小臼齿。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。