下牙弓

下唇挡与twinblock联合矫治对下牙弓的影响

The study of effects on the mandibular arch resulted by the application of Mandibular Lip Bumper combined with Twin Block

结论临床上扩展AngleⅡ~1的后上牙弓宽度可能是协调上下牙弓形态的重要措施之一。

Conclusion : Expanding maxillary posterior arch width in Angle ⅱ 1 patients may be one of the important methods to harmonize upper and lower arch form .

目的观察下唇挡与twinblock联合矫治Ⅱ类Ⅰ分类错（牙合）对下牙弓的影响。

Objective To observe the effects of mandibular arch resulting from the application of Mandibular Lip Bumper combined with Twin Block to treat Class ⅱ division ⅰ malocclusion .

上唇压力与切牙覆盖呈正相关，下唇压力与切牙覆牙合及下牙弓长度呈正相关，并可导致下颌后缩，加重了AngleⅡ类错牙合畸形。

Upper lip pressure was related to the overjet between incisors , lower lip pressure was related to deep overbite and the length of dental arch , and therefore related to Angle Class ⅱ malocclusion .

经治疗和保持后，上下牙弓宽度和长度并非一定会复发。

Not all of dental arch width and length will relapse after retention .

结论建立下牙弓后段可用间隙预测方程。

Conclusion The equations predicting the available space of lower posterior arch were established .

儿童下牙弓发育的测量

Measurements of mandibular dental arch growth in children

目的研究下牙弓后段可用间隙生长变化特点。

Objective To study the growth changes of available space of lower posterior arch .

下牙弓后段可用间隙测量分析

Available Space Analysis of Lower Posterior Arch

②肌位牙位不调与否的两组间在上下牙弓后段宽度上存在差异；

Significant difference of the posterior arch-widths was observed between the group with and without ICP-MCP discrepancy .

上牙弓发育较早，但下牙弓发育速度快于上牙弓。

The development of the upper dental arch was earlier , but the down dental arch faster .

下牙弓变化中，第二双尖牙间和磨牙间宽度增加有显著性差异。

In addition , the changes of width between second bicuspid and mandibular molars showed statistical significances .

下牙弓后段可用间隙与下后牙槽高度关系研究

A study on the relationship between the available space of lower posterior arch and lower posterior alveolar height lower

2骨性安氏1的矫治主要是解决了长度和高度的不协调，同时，通过改变后牙牙弓宽度，补偿性协调了上下牙弓宽度的不协调。

Orthopedic treatment on skeletal class ⅱ 1 malocclusion was mainly solved abnormal of length and highness , and by modified width of arch compensated width .

第三组上颌发育正常，下颌发育不足，上牙弓拥挤度Ⅲ度，下牙弓轻微拥挤或无拥挤4名，拔牙模式为44。

The third group consisted of 4 patients with maxillary normal growth , mandible growth deficiency and severe upper crowding , treated by extraction of only 2 upper first premolars .

对下颌骨或下牙弓不对称的患者，牵引时应调整力值与方向以避免位移偏差；

To avoid wrong movement of the lower teeth of the patients with asymmetric mandible and dental arch , the force value and direction of class II elastics should be adjusted ;

结论：面部不对称主要表现在面下1/3及牙弓区；

Conclusion : The asymmetries mainly involve in the 1 / 3 lower faces and dental arches ;