牙颈

牙冠与牙根交界处呈一弧形曲线，称为牙颈，又名颈缘或颈线。

Tooth coronal and tooth root boundary show one arc curve , call tooth neck , renown neck predestined relationship or neck line .

方法：应用三维有限元和多元逐步回归分析方法，对影响骨界面应力分布的一些因素，根据种植牙颈周骨内应力值进行了统计分析。

MATERIALS AND METHODS : Using three-dimension finite element method and multivariate step regression analysis , authors analyzed influencing factors on the stress distribution patterns at the bone interface based on the stress magnitudes surrounding dental implant neck .

恒牙牙颈曲度的测量研究

A study of cervical curve of permanent teeth

致病因素以横式刷牙及牙颈结构不良为主（分别占70.8%、50.2%）；

Pathogenic factors were mainly transverse tooth brushing and poor structure of dental necks ( 70.8 % and 52.2 % respectively );

牙龈：附于并环绕牙颈及毗邻的牙槽骨的黏膜。

Gum ( or gingiva ) : Mucous-membrane-covered connective tissue attached to and surrounding the necks of the teeth and the alveolar bone of the jaw .

前牙PFM颈缘三维有限元受力分析

Three-dimensional Finite Element Analysis of Stress Distribution of Anterior Teeth PFM

牙轮钻头牙爪轴颈磨削研究

Research into Jaw Journal Grinding for Teethed Drilling Bit

在钻压加扭矩共同作用下，牙爪轴颈和止推面上的压应力分布不对称，接触区域发生偏移，止推面上接触区偏移较多。

Under the combined action of the drill pressure and torque , the distribution of the compressive stress on the journal and thrust surface is asymmetric , and the contact zone is offset .

用有限元法对某型三牙轮钻头的2号牙轮－牙爪进行了静力计算，求得不同轴承间隙时牙爪轴颈及止推面上的接触应力分布规律。

A static analysis of the No. 2 leg-cone of a tricone bit is conducted by the finite element method , and the distribution pattern of the contact stress on the leg journal and thrust surface with different bearing clearances is worked out .