钕钇铝石榴石激光照射对有无石墨涂片情况下开放牙本质小管数量及其直径的影响：一项体外研究。
Effect of Nd:YAG Laser Irradiation on the Number of Open Dentinal Tubules and Their Diameter with and without Smear of Graphite: An in Vitro Study.
作者信息
Maleki-Pour Mohammad Reza, Birang Reza, Khoshayand Maryam, Naghsh Narges
机构信息
Department of Restorative Dentistry, School of Dentistry, Islamic Azad University, Isfahan, Iran.
Torabinejad Dental Research Center, Department of Periodontology, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
出版信息
J Lasers Med Sci. 2015 Winter;6(1):32-9.
INTRODUCTION
Dentin hypersensitivity (DH) is characterized by tooth pain arising from exposure of dental roots. In this study the efficiency of neodymium yttrium-aluminum-garnet (Nd:YAG) laser in association with graphite on dentinal surface changes as the alternative to the treatment of DH was evaluated.
METHODS
Sixteen noncarious human third molars were collected and sectioned into 5 parts from cementoenamel junction (CEJ) to the furcation area. The prepared samples were randomly assigned into five groups (Gs) of each 16: Control (G1), treated by Nd:YAG laser at 0.5 W (G2), irradiation of Nd:YAG with a 0.25 W output power(G3), smeared with graphite and then using Nd:YAG laser at output powers of 0.5 W (G4) and 0.25 W (G5). For all groups the parameters were 15 Hz, 60 s, at two stages and with a right angle irradiation. The number and diameter of dentinal tubules (DT) were compared and analyzed by SPSS software, One way ANOVA and Post hoc LSD tests.
RESULTS
The number of open dentinal tubules varied significantly between all groups except among G1 with G3 and G2 with G5. Multiple comparison tests also exhibited significant differences regarding the diameter of tubules between the groups two by two except among G2 with G5.
CONCLUSION
Nd:YAG laser used at 0.25 W and 0.5 W with application of graphite smear was able to reduce the number and diameter of dentinal tubules.
引言
牙本质过敏症（DH）的特征是牙根暴露引起的牙痛。在本研究中，评估了钕钇铝石榴石（Nd:YAG）激光联合石墨对牙本质表面变化的作用，作为治疗DH的替代方法。
方法
收集16颗无龋的人类第三磨牙，从牙骨质釉质界（CEJ）到根分叉区切成5部分。将制备好的样本随机分为5组，每组16个：对照组（G1），用0.5W的Nd:YAG激光治疗（G2），用输出功率为0.25W的Nd:YAG激光照射（G3），涂抹石墨后再用输出功率为0.5W的Nd:YAG激光治疗（G4）和0.25W的Nd:YAG激光治疗（G5）。所有组的参数均为15Hz，60秒，分两个阶段，呈直角照射。通过SPSS软件、单因素方差分析和事后LSD检验比较和分析牙本质小管（DT）的数量和直径。
结果
除G1与G3、G2与G5之间外，所有组之间开放牙本质小管的数量差异显著。多重比较检验还显示，除G2与G5外，各组之间小管直径两两之间存在显著差异。
结论
0.25W和0.5W的Nd:YAG激光联合石墨涂抹能够减少牙本质小管的数量和直径。
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