灯盏花离子导入加速人尖牙移动的生物力学评价

本文从生物力学角度证实中药灯盏花离子导入对正畸牙移动速度的影响。选择上颌两侧尖牙唇向错位恒牙初期患儿１０名，拔除上颌两侧第一双尖牙，在上颌两侧第一磨牙及尖牙上装置统一规格矫治器，两侧尖牙在拉簧作用下向远中移动。右侧上颌尖牙牙龈处放置正极接头，导入灯盏花离子；左侧尖牙导入蒸馏水作同源对照。离子导入电流为０．２ｍＡ，导入时间为２０ｍｉｎ，每两周导入一次，并记录尖牙移动距离及其所需时间。结果显示，实验侧尖牙移动速度为０．１６８ｍｍ／天，对照侧为０．０９９ｍｍ／天（ｐ＜０．０１）；实验侧尖牙移动加速度为３．４２×１０－３ｍｍ／天２，对照侧为１．９１×１０－３ｍｍ／天２（Ｐ＜０．０１）；实验侧尖牙移动时所遇到的牙周阻力为８２．６０ｇ，对照侧为１０９．３６ｇ（ｐ＜０．０５）。本研究证实了中药灯盏花有利于牙周组织的改建，具有加速正畸牙移动的促进作用，为临床应用该药提供了实验依据。

A BIOMECHANICAL ANALYSIS FOR THE EFFECT OF E B IONTOPHORESIS ON ACCELERATING TOOTH MOVEMENT OF HUMAN CANINES

The purpose of this study is to confirm the effect of Eriqeron Breviscvps(EB), a Chinese medicinal herb, to speed up orthodontic tooth movement by means of biomechanic analysis. Ten cases, who had labioversion malposition of upper canines and had their upper first premolars extracted, were selected in this study. The upper canines and first molars of all cases had been placed standard orthodontic appliances which could force the canines to move distally. The gauze connected with positive electrode were touched at gingival area of the canines with right side infiltrated with solution of, EB and left side with distilled water served as control. The ion-introduction was performed every other week with direct current of 0.2mA and testing over 20min every time.The results showed there were significant differences in biomechanics of canines movement between two sides, with average velocity, acceleration and periodontal resistance in right canines being 0.168(mm/day),3.42×10-3(mm/day2)and 82. 60(g),and in control side being 0.099(mm/day),1.91×10-3(mm/day2)and 109.36(g).The study observed the mechanical characteristics of canines' movement which could quantitatively and scientifically prove that EB iontophoresis had a high ability to reconstruct periodontal tissues during the orthodontic tooth movement, which would lay the experimental foundation for applying EB into clinial practice.