Objective: Research the change in alveolar bone crestheight 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。
2
The dam crestheight 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。
3
Amplitude (a) : the height from the water plane to the wave crest.