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-  2016 

Er, Cr:YSGG激光对牙周炎患牙及健康牙根面的影响
Effects of Er, Cr: YSGG laser on the root surface of periodontitis and healthy teeth

DOI: 10.3969/j.issn.1671-167X.2016.01.012

Keywords: YSGG 激光, 牙周炎, 牙骨质, 粗糙度
Er
, Cr:YSGG lasers, Periodontitis, Dental cementum, Roughness

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Abstract:

目的:探讨应用RFPT5-14工作尖的Er, Cr: YSGG激光照射对牙周炎患牙及健康牙根面微观结构改变以及粗糙度的影响。方法:选取8颗因牙周炎拔除的患牙,用超声刮治器去除根面牙石,另选取8颗因正畸减数或阻生智齿拔除的健康牙,将每颗牙根面分为4个区域,对应为1~4组,分别进行如下4种处理:(1)不处理;(2)Gracey刮治器进行根面平整30 s;(3)低功率激光照射30 s;(4)高功率激光照射30 s。通过扫描电镜观察表面微观结构,通过三维光学轮廓仪测量表面粗糙度Ra值。结果:手工根面平整组的表面可见玷污层覆盖;激光照射组表面较清洁,可见消融样改变;高功率激光组可见局部有牙本质小管暴露。牙周炎患牙第1组的Ra值为(237.4±20.0) nm,第2~4组的Ra值分别为(135.7±11.9) nm(P=0.01)、(463.6±49.3) nm(P<0.001)和(486.0±59.0) nm(P<0.001)。健康牙第1组的Ra值为(191.4±44.5)nm,第2~4组的Ra值分别为(131.6±21.5) nm(P=0.482)、(463.7±34.6) nm(P<0.001)和(470.3±121.3) nm(P<0.001)。结论:应用RFPT5-14工作尖的Er, Cr: YSGG激光照射可造成牙周炎表面的病变牙骨质及健康牙表面的健康牙骨质微观结构的改变,可以有效减少根面玷污层,并可见有消融样改变。Er, Cr: YSGG激光照射可以增加根面粗糙度,还需进一步实验来评价激光照射后根面的生物相容性。
Objective: To evaluate the effects of Er, Cr: YSGG laser on the root surface of periodontally involved teeth and healthy teeth, concerning the microstructure and the roughness. Methods: Eight freshly extracted teeth due to severe periodontitis and eight freshly extracted teeth due to orthodontic reasons or being third molar were chosen in this study. The root surface of each tooth was divided into four areas, and received four treatment methods: no treatment (control group); root planing with Gracey scaler for 30 seconds; irradiation by the lower power Er, Cr: YSGG laser; irradiation by the higher power Er, Cr: YSGG laser. Four periodontally involved teeth and four healthy teeth were used for the evaluation of microstructure using scanning electron microscope (SEM). The other four periodontitis teeth and four healthy teeth were used for the evaluation of roughness (Ra value) using 3D profiler.Results: Smear layer was found on the teeth scaled by Gracey scaler, while the teeth irradiated by Er, Cr: YSGG laser demonstrated a melting surface with less smear layer. In the periodontitis teeth irradiated by the higher power, opening dentinal tubules could be observed. For the periodontally involved teeth, the Ra values of groups 1 to 4 were (237.4±20.0) nm, (135.7±11.9) nm (P=0.01), (463.6±49.3) nm (P<0.001) and (486.0±59.0) nm (P<0.001) respectively. For the healthy teeth, the Ra values of groups 1 to 4 were (191.4±44.5) nm, (131.6±21.5) nm (P=0.482), (463.7±34.6) nm (P<0.001) and (470.3±121.3) nm (P<0.001) respectively.Conclusion:Er, Cr: YSGG laser can affect the microstructure of the cementum of the periodontitis teeth and healthy teeth. Irradiation by the Er, Cr: YSGG laser resulted in a melting surface with less smear layer and increased the roughness in the surface of root.

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