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In Angle's Class II,division 1 patients, the upper incisors labially inclined and closed up the upper lip,the lower lip reduced the covering with the upper incisors' crown.

安氏II类1分类错唇齿关系形态特征表现为:上中切明显唇倾并与上唇过度贴合,上唇外翻,下唇对上中切覆盖明显减少。

The proportion of maxillary center incisors, maxillary lateral incisors, maxillary canines curved in mesiodistal were 11.17%, 16.19% and 21.43%, in labio-lingual were 39.59%, 40.00% and 29.59%, both in labiolingual and mesiedistal directions were 4.60%, 35.24% and 24.49%.

大约50%左右的上颌前根管存在中度弯曲:与上颌切相比,上颌尖的弯曲度略大而弯曲半径略小。

Results: Immunohistochemical staining revealed that expression of RANKL protein was detected in periodontal ligament cells and osteoclasts which mostly located in resorption lacunae.

结果:正畸移动压力侧组化结果显示,RANKL阳性表达位于周膜细胞和位于骨陷窝内的破骨细胞中,在正畸移动第3、5和7天时呈强阳性表达。

A small and gradually TW was a physiological process accompanied by ones all life, but severe TW could cause a series of pathological changes between tooth and dentition, occlusion and articulation, the maxillomandibular relation and masticatory muscles. TW can affect the healthy between mastication and all correlated tissue.

少量的、逐渐的齿磨耗是伴随一生的生理过程,而重度磨耗可以引起列、与咬合、颌间关系与颌周肌肉、颞下颌关节等发生一系列病理变化,从而影响到咀嚼功能和各相关组织的健康。

In the soft tissue measurements, the value of soft tissue facial angle and B'-Pos-FH in the first extraction group was less than those in the second extraction group significantly. After treatment all the patients had an increase in S-Ns-Pos angle, soft tissue facial angle, B'-Pos-FH and depth of mentolabial groove. At the same time, soft tissue convexity angle was diminished obviously. But the change was not significant between the two premolar extraction groups.

2在对软组织项目的测量中,治疗前第一前磨拔除组的软组织面角、颏沟倾角均小于第二前磨拔除组,治疗后2组均出现软组织面凸角减少,颏凸角、软组织面角、颏沟倾角、颏唇沟深度增加;但2组在各项测量项目的变化上无显著组间差别。

The premature loss of primary incisors does not usually require the placement of a dental appliance for the maintenance of space because mesial movement of the adjacent teeth is not generally expected.

乳切的早失,不一定需要空间保持器的置放,这是因为邻的偏移较少会产生

Objective To study the second molar transition mesially with Edgewise technique.

目的 研究第一磨拔除后用方丝弓技术近中平移上下颌第二磨的临床效果。

Conclution more mesially inclined maxillary molars are likely to be associated with third molar eruption.

第三磨萌出与上颌第一、第二磨较大的近中倾斜有关。

Results The lower teeth migrate mesially 0.14 mm and 1.21 mm during 16 weeks, and the upper teeth migrate mesially 1.36 mm and 2.08 mm during 24 weeks.

结果 下颌有、无对实验,16周移动量分别为0.14 mm和 1.21 mm,上颌实验24周移动量分别为1.36 mm和2.08 mm。

The three maxillary molars at the experimental sides were moved as one unit mesially by a Sentalloy coil spring delivering a force of 10 cN over a long range of activation. The contra-lateral molars served as controls. At 1, 2, 4, 8, and 12 weeks groups of animals were killed for histological evaluation.

实验侧的三颗磨用结扎丝颌粘接剂固为一个整体,在超弹性拉簧作用下(力值为0.1牛顿)向切侧移动。l, 2, 4, 8和12周时给予大鼠过量麻醉剂,材料用于组织学研究。

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