Er,Cr:YSGG激光照射后牙周病牙根面的形态学研究和钙磷比率分析

Morphological Study and Ca/P Ratio Analysis of Er, Cr:YSGG Laser Irradiation on Periodontal Diseased Root Surfaces

目的观察Er,Cr:YSGG激光照射后牙周病牙根面的形态学变化及主要元素钙、磷的改变。方法收集中、老年人离体牙周病牙18颗、健康阻生第三磨牙6颗。对18颗牙周病患牙根面进行平整后,随机选取12颗作激光照射研究;其余6颗作酸处理研究;6颗第三磨牙作健康对照。扫描电镜下观察不同根面处理方式导致的根面形态变化,用色谱分析仪分析各组根面钙磷比率(Ca/P),并进行统计学比较。结果激光照射组可有效去除玷污层,得到粗糙度较均匀、洁净的根面。酸处理组去除根面玷污层能力较强,但电镜观察两组根面形态有差异。两组均未发现熔融、炭化、裂纹及牙本质暴露。色谱分析仪分析结果显示激光照射组与酸处理组根面钙磷比率无明显差异(P>0.05)。结论Er,Cr:YSGG激光照射根面平整后的牙周病牙根面可有效去除玷污层及表层病变牙骨质,具有潜在的应用价值。

Objective To observe the morphological transformation and Ca/P changes of the periodontally disease root surfaces irradiated by Er, Gr：YSGG Laser. Methods 18 periodontally diseased teeth and 6 wisdom teeth were collected in vitro. After 18 periodontally diseased teeth were planed, 12 teeth were randomly selected as the laser treatment group, the others as the acid treatment group. The 6 wisdom teeth were selected as the healthy control. Then the evaluation for root surfaces morphological transformation was conducted by SEM. An energy spectrum analyzer was used to analyze the Ca/P ratio of root surfaces. Results The root surfaces were clean and even in the laser treatment group. Smear layer could also be effectively eliminated in the laser treatment group and the acid treatment group, but the SEM results were different. Atom content analysis showed that the Ca/P ratio of the laser treatment group and the acid treatment group had no distinct difference. Conclusion It is effective to remove smear layers and infected cementum of surface layers with Er, Cr： YSGG irradiating on the planed periodontal root surfaces.