切牙

Results The expression of Bag-1 protein both in ameloblast and odontoblast was inhibited in experimental group.

结果 实验组大鼠切牙釉基质形成紊乱，成釉细胞和成牙本质细胞Bal-1蛋白表达明显低于对照组，差异有显著性(P.01)。

Impacted tooth frequently appears in upper cuspid and upper central incisors .

较常见的是尖牙和上颌切牙的埋伏阻生。

The continuously growing incisor of the rodent is subdivided into a crown analog half on the labial side, with a cervical loop containing a large core of stellate reticulum, and its progeny gives rise to enamel producing.

啮齿类动物的切牙可以终生生长，它被分为了牙冠发育模式的唇侧和牙根发育模式的舌侧，唇侧的上皮包括一个颈环结构，其内含有星网状层细胞，可以不断的分化为成釉细胞并形成釉质。

Objective To study the clinical curative effect of superior central incisor diastema restored with Esthet-X.

目的 研究Esthet-X复合树脂修复上颌中切牙牙间隙的临床效果。

Objective To investigate the therapy of malocclusion which accompanied with congenital missing lower incisors.

目的：探讨伴有下切牙先天缺失的错牙合畸形的临床治疗方法。

The correlation of the three forms is rather low, but the correlation between every two forms is comparatively high. The curves of 4 order polynomial equation can fit the dental arches well.

成都地区正常牙合人的面形、弓形和切牙形三者的相关性较低，而它们两两间的相关性较高。4次方程曲线可对牙弓进行良好的拟合。

The position changes of mandibular molars were measured from mesiodistal direction and vertical direction, and the implant anchorage loss was evaluated by maxillary central incisor.

通过测量下颌第二磨牙在近远中方向、垂直向的位置变化，以衡量磨牙的位置改变。并通过下颌中切牙的位置变化，评价支抗强弱。

RESULTS AND CONCLUSION: The course of treatment was 10.4 months, and the velocity of mandibular second molar mesializing was 0.8 mm per month, with 8.5 mm in mesiodistal direction, there was no changes in the vertical direction.

结果与结论：疗程10.4个月，下颌第二磨牙平均移动速度为0.8 mm/月；平均近中移动8.5 mm，垂直向没有变化；磨牙长轴向远中倾斜角度为2.5°，下颌中切牙位置无改变。

Methods To choose 24 adult healthy male SD rats, take the first molar and middle slice tooth of right upper jaw as experimental teeth, divide them into 4 groups: Normal force 3-day group; force with restriction of sleeping 3 -day group; Normal force 7-day group; force with restriction of sleeping 7-day group.

取成年健康雄性SD大鼠24只，采用大鼠右侧上颌第一磨牙和右侧上颌中切牙为实验牙，随机分为4组：正常加力3天组，睡眠限制加力3天组，正常加力7天组，睡眠限制加力7天组。

With increasing resorption of alveolar bone, the center of resistance of the maxillary incisors including pulp cavity, were located within the mid-sagittal plane,6.1mm lingual to archwires labial side, respectively at 38.5 %, 47.3%, 55.2%, 64.1%, 75.2%length of the central incisor measured from the alveolar crest.

1、在不同程度齿槽骨吸收时上颔切牙段在各种载荷作用下，中切才｝侧切才的应力分介基木相同，均为丁恨表而应力最大，齿槽骨人山厂入上，丁人司膜应力最个。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。