脉冲Nd:YAG激光照射对釉质耐磨性的影响  

Effects of laser irradiation on the abrasion rate of dental enamel

作　　者：陈志云[1] 吴补领[1] 唐立辉[1] 

机构地区：[1]第四军医大学口腔医学院,陕西西安710032

出　　处：《牙体牙髓牙周病学杂志》2002年第2期83-86,共4页Chinese Journal of Conservative Dentistry

摘　　要：目的 :研究激光照射对釉质耐磨性的影响。方法 :用不同剂量的脉冲Nd :YAG激光照射人牙釉质 ,测量照射前后釉质硬度及磨耗率的改变 ,并用扫描电镜观察釉质表面形态的变化。结果 :釉质的硬度随激光照射剂量的增大而显著降低 ,幅度最大者硬度仅达正常釉质的 41%。釉质的磨耗率随激光照射剂量的增大而升高 ,最高可达正常釉质的 3.83倍。釉质在激光照射下出现熔融与再结晶现象 ,表面变粗糙 ,晶体结构变疏松。结论 :激光使釉质的耐磨性降低 ,机械强度降低 ,提示临床应用中不宜采用过高强度激光照射釉质。AIM:To understand the effects of laser irradiation on the abrasion rate of dental enamel. METHODS:Human enamel blocks were irradiated with pulsed Nd:YAG laser at different energy . The surface hardness and abrasion rate of enamel were examined before and after laser irradiation. Morphological changes of enamel were observed with SEM. RESULTS:The abrasion rate increased with the increased dose of laser irradiation, reaching 3.83 times of the control group. Hardness of the enamel decreased greatly, dropping to 41% of the control group. SEM examination revealed that melting and recrystallization occurred during laser irradiation. The enamel surface became rough and crystal structure became loose. CONCLUSION:Laser irradiation can decrease the mechanical intensity of enamel and increase its abrasion rate. So it is not recommended to apply high dose of laser irradiation on enamel clinically.

关 键 词：釉质 磨耗率 脉冲ND:YAG激光 龋齿 疾病预防 

分 类 号：R780.1[医药卫生—口腔医学]