本研究选择临床正畸拔除的健康双尖牙70只,随机分为7组,每组10只。分别对70只牙行牙髓摘除术,然后以日本产 Minotla—100型便携式测色色差计,测量牙髓腔血液分解产物进入牙本质及根管治疗常用药物对牙体染色前后的色差值,用温度漂白法和诊间漂白法对70只牙进行漂白,再以色差计测量漂白前后的色差值,结果证实丁血液分解产物及药物在染色牙中的作用、过程和机理。结果还表明,两种漂白法对医源性染色牙的漂白作用是明显的。 This study selected 70 orthodontic extracted healthy double canines, were randomly divided into 7 groups of 10. Totally 70 teeth were subjected to endodontic excision. The color difference between before and after tooth decay was measured by using Minotla-100 portable colorimeter in Japan. 70 bleached teeth were bleached by temperature bleaching method and bleaching clinic. The color difference values ​​before and after bleaching were measured by color difference meter. The results confirmed the action, process and mechanism of undecomposed blood products and drugs in stained teeth. The results also show that bleaching of iatrogenic stained teeth by both bleaching methods is evident.