Objective: Research the change in alveolar bone crest height among 2-phase treatment, pendulum and extraction treatment in Class II malocclusion.
目的：了解拔牙与非拔牙矫治在治疗安氏II类错时牙槽嵴高度的变化情况。
The dam crest height is determined based on static water level, wave run-up, and freeboard. The freeboard is calculated according to the following formula.
坝顶高程由水库静水位加波浪爬高及安全超高决定。坝顶在静水位以上的超高按下式计算。
Amplitude (a) : the height from the water plane to the wave crest.
振幅(A)：从水平面到波峰的高度。
Objective: To study if closing obsolete molar space could cause severe resorption of alveolar crest through comparing the height of alveolar crest before and after closing obsolete molar space.
目的：通过对正畸关闭陈旧性磨牙间隙前后牙槽嵴高度的对比，探讨关闭陈旧性磨牙间隙是否加重牙槽嵴吸收。
Results Orthodontic treatment with circumferential fibrotomy can make new attachment and increase the height of crest bone.
结果结合牙龈环切的正畸治疗后患牙牙槽嵴顶高度增加，产生新附着。
Method: 29 lower first molar Spaces were observed and the height of alveolar crest before and after treatment were analyzed with paired-t tests.
方法：观察下颌第一磨牙陈旧性拔牙间隙29处。测量矫治前后该处牙槽嵴高度，将测量值进行配对t检验。
Method: 29 lower first molar Spaces were observed and the height of alveolar crest before and after treatment were analyzed with paired-t tests.
方法：观察下颌第一磨牙陈旧性拔牙间隙29处。测量矫治前后该处牙槽嵴高度，将测量值进行配对t检验。
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