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Three cross-sections were made through crown and gingiva of the model tooth. Curve functions of axial buccal crown and gingiva contour of each section were acquired by means of curve fitting, and the angle of emergence pofile was calculated, which represents the degree of undercut.

以下颌第二前磨牙为研究对象，在牙列模型上通过牙冠部、牙龈作3个纵断面，用曲线拟和的方法得到每个断面的牙齿轴面外形及相应牙龈外形的曲线方程，以此分析两者之间的关系并计算牙冠起始外形角度，即倒凹程度的大小。

This act prolongs the trauma to the mouth and in many cases is a precursor to anterior tooth loss.

"这项法案延长创伤口，而且在很多情况下是一个前奏前牙的损失"。

The rest of the shell is then rolled towards the tooth in an anticlockwise direction, in order to remove it.

为了脱身其余的蜗壳就会以逆时针方向绕着螃蟹的牙齿旋转。

The fluorine that contains in salt can have the antiphlogistic and antiseptic, effect that avoids tooth of eat by moth.

食盐中含有的氟能起到消炎杀菌。防止蛀牙的作用。

If you have a "sweet tooth," you might even think of apple pie or

如果你是好吃甜食的人，你可能会想到苹果派或巧克力

Movement of a tooth by extrusion involves applying traction forces in all regions of the periodontal ligament to stimulate marginal apposition of crestal bone.

运动牙齿的挤压涉及申请牵引部队在各地区的牙周膜，以刺激边缘沉积的crestal骨头。

Unique feature: the gear uses has the international the 80s advanced level new technical -- double circular arc sine curve tooth.

齿轮采用具有国际八十年代先进水平的新技术——双圆弧正弦曲线齿型。

We're excited about making Aine's tooth fairy doll part of the Argos toy range.

让我们对艾内的牙齿仙女的Argos的玩具娃娃的一部分范围兴奋。

And that, says Strait, suggests that simplistic ideas about australopithecine diets, based on tooth and jaw size, and why they went extinct, need to be reevaluated.

斯特雷特还说，根据牙齿和颚的大小提出的关于南方古猿日常饮食以及它们为什么灭绝的过分简单的想法需要重新评估。

Methods The data of 32 cases (42 teeth) of tooth autotransplantation in last 10 years were collected.

目的 评价自体牙移植的临床效果。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。