为探讨Nd∶YAG激光对老年人早期龋的治疗作用 ,选择 60岁以上病人拔除的患有早期根面龋的离体牙若干枚 ,分别用不同功率Nd∶YAG照射龋损部 ,然后用光敏窝沟封闭剂封闭 ,并用扫描电镜进行观察。结果 ,扫描电镜下见早期根面龋呈蜂窝状或蚕蚀状 ,Nd∶YAG照射后呈熔融状 ,封闭后龋损区表面光滑 In order to investigate the therapeutic effect of Nd:YAG laser on the early caries in the elderly, several incised teeth with early root caries removed from patients over 60 years old were selected to irradiate the carious lesions with different Nd: YAG doses respectively, Pit and fissure sealant closed, and observed with a scanning electron microscope. Results, under the scanning electron microscope, early root caries was honeycomb or silkworm erosion, Nd: YAG after irradiation was molten, the surface of the carious lesions after closure was smooth