尖牙

METHODS: A total of 36 patients from the Affiliated Hospital of Guilin Medical College between September 2003 and August 2006 were treated with OPAK system of 0.022 inch straight wire appliance to pull out four permanent teeth of first bicuspid in symmetrical order.

选择2003-09/2006-08在桂林医学院附属医院进行口腔正畸治疗，双侧对称拔除四颗第一双尖牙的恒牙牙合患者36例。

Results: The average value of periodontal attachment level in the healthy adults was 5.03 mm in incisor zone, 2.93 mm in bicuspid zone, and 3.45 mm in molar zone.

结果 ：健康成年人牙周附着水平平均值前牙区为 5 。0 3mm、双尖牙区为 2 。93mm、磨牙区为 3.45mm。

The length, width, axial gradient for the crowns,the heigh of gingival line,the width of anterior dentition and the ratio of crista marginalis of their teeth were measured and analysed in their photographs and dental casts after orthodontic treatment.

测量关于正畸治疗后上颌第一前磨牙和对侧尖牙的龈缘线高度和牙齿形态的6项指标：龈缘线高度、临床冠长度、宽度、单侧前牙列宽度、轴倾度和近远中边缘嵴比，进行两均数配对t检验，观察分析两组的差异。

Class Ⅲ furcation defects were created at the mandibular second pre-molars, first molars and second molars.

人工制备3只食蟹猴双侧下颌第二双尖牙、第一磨牙和第二磨牙的慢性Ⅲ度根分叉病损。

METHODS: Three-dimensional finite element mandible model was established based on the CT scanning data. The mini-implant was implanted in the region between first mola and second premolar at 30°, 60° and 90° tilted mesiolly, and 30° and 60° tilted occlusally, respectively.

应用颌骨CT扫描图象建立三维有限元模型，在下颌第1磨牙及第2双尖牙间分别以牙合向30°，60°，90°，近中向30°，60°植入种植体，给以水平方向1.96 N 加载。

After being loaded with horizontal retraction force at various height, displacement and stress distribution of anterior teeth was not well-distributed. Labiolingual displacement of incisors varied from crown lingual tipping to lingual translation and lingual controlling root movement, while canine mainly showed crown lingual tipping. The displacements of teeth increased with the length of hook but their moving tendency remained unchanged. Stress distribution in PDL was in accordance with teeth displacement.

2水平向后牵引力的作用点升高时，上前牙的位移和应力分布趋势各不相同：切牙的唇舌向位移由冠舌向倾斜逐渐变为舌向整体移动和舌向控根移动，尖牙则以冠舌向倾斜位移为主；前牙位移量随牵引力高度增加而增大，但位移趋势较为稳定；牙周膜应力分布与其位移趋势相一致。

After 4~8 months, in adult bimaxillary protrusion patients, cuspids were moved to distal, the upper first molars were moved 1.12mm mesially evenly, and the upper incisors were moved 7.91mm palatelly evenly.

成人双颌前突患者在4～8个月后远移尖牙到位，拔牙间隙基本关闭，上颌第一磨牙为近中整体前移，其冠部平均前移了1.12mm，上颌切牙冠部平均向腭侧倾斜移动约7.91mm。

Methods Ten skeletal Class II division I malocclusion patients in permanent dentition with ANB 7.4° and overjet 8-11mm were treated by Edgewise technique with extract 4 first bicuspids, cephalometric measurements before and after treatment were done.

对10名前牙深覆盖达到8～11mm且ANB平均为7.4°伴Ⅲ°深覆牙合的恒牙期患者，采用方丝弓技术进行矫治，均拔除4个第一双尖牙，并对所有患者正畸治疗前后进行头影测量分析。

Methodsten skeletal class ii division i malocclusion patients in permanent dentition with anb 7.4° and overjet 8-11mm were treated by edgewise technique with extract 4 first bicuspids, cephalometric measurements before and after treatment were done.

对10名前牙深覆盖达到8～11mm且anb平均为7.4°伴ⅲ°深覆牙合的恒牙期患者，采用方丝弓技术进行矫治，均拔除4个第一双尖牙，并对所有患者正畸治疗前后进行头影测量分析。

The normal strain on the surface of the periodontal ligament is assumed as the mechanical stimulus proportional to the absorption rate of alveolar bone in each week.

选用一个正畸患者的下颌尖牙，建立包括牙齿、牙周膜、牙髓、牙槽骨的三维实体模型，通过有限元计算得到初始应变分布。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失