目的:探讨激光冠内漂白治疗死髓牙变色的治疗作用.方法:漂白基本操作同激光活髓牙变色的漂白操作程序.先将牙龈及口唇有效防护,将漂白药物放在唇舌两面并同时封人根冠内.结果:所有牙齿的灰暗变色均有3～5级的色度提高.平均治疗次数为3.4±0.75,脱色85%以上的占89%.结论:牙齿创伤和牙髓分解是冠内变色的常见原因,激光冠内漂白是治疗这种变色的有效手段.

Objective: The treatment protocol was designed to assess the efficacy of intracoronal laser teeth bleaching in the treatment of nonvital teeth darkening. Methods: The procedure was much the same with conventional laser teeth bleaching. Gum and lips were protected and bleaching agent was applied on buccal &. lingual surface (including root canal). Results: Teeth received laser bleaching showed 3 - 5 shades whiter. 89% patients had a greater than 85% in the discolorant after an average of 3. 4±0. 75 treatment. Conclusion: Teeth darkening caused by trauma or pulp degeneration are candidate for intracoronal laser teeth bleaching.