关键词: Er∶YAG激光, 乳牙龋齿治疗, 微创

Abstract:

Er∶YAG（2940 nm）laser is in the near-infrared region of the electromagnetic spectrum where it is readily absorbed by water within and between the hydroxyapatite crystals in the tooth. With its many advantages such as painlessness，minimal invasiveness and comfort，Er∶YAG laser has been widely used in dental practice since its introduction and is approved by the FDA in 1997 for dental hard tissues. It can effectively cut enamel and dentin without damaging the pulp and reduce the bacteria stayed in the dentin to prevent secondary caries. The surface morphology of cavities has been evaluated by SEM after laser preparation in the primary teeth，and the laser has been shown to be able to remove smear layer. The surfaces were scale-like and uneven with open dentinal tubules without plugging of the tubules. Self-etching system was recommended to be used after irradiation by Er∶YAG laser on primary teeth to obtain superior bonding strength and less marginal micro-leakage. When used in caries therapy in children，most children considered Er∶YAG laser was more comfortable and painlessness compared with drill treatment. At present，Er∶YAG laser can undertake，cavity preparation in permanent or primary teeth，indirect pulp treatment，laser assisted pit and fissure sealants，preventive resin restoration，pulp amputation. Besides that Er∶YAG laser can be used on soft tissue such as operculectomy，frenectomy，etc. Finally，laser has proven to offer new treatment opportunities that were not available in the dental field in the past.

Key words: Er∶YAG laser, caries therapy, primary teeth, minimal invasiveness