Effect of bleaching on pulpless discolored teeth.

采用以过氧化脲为基料的Night White Excel和以过氧化氢为基料的比利牛斯为基料，对深色蛋壳表面进行漂白。用卤素灯(PENCURE)和KTP激光进行漂白反应。试验一分别用卤素灯和KTP激光漂白，用3W的KTP激光照射蛋壳表面1分钟，漂白剂后30秒、3分钟、5分钟、10分钟。卤素光照射壳体表面的时间分别为1分30秒、3分钟、5分钟、10分钟，与KTP激光相同。照射后，所有标本在37℃保存半天，分析颜色变化。在实验2中，卤素光和KTP激光联合使用。卤素光和KTP激光的照射程序与实验1相同，并分析了所有试件的颜色变化。结果表明，在实验1中使用Night Excel漂白剂后，用KTP激光照射3分钟以上即可观察到漂白效果；而在使用比利牛斯漂白剂时，用KTP激光照射5分钟以上即可观察到漂白效果。在卤素光照射的样品中，Night White Excel和比利牛斯法的漂白效果均超过1min 30s。在实验2中，Night White Excel和比利牛斯涂抹的方法也都出现了超过1min和30s的漂白效果。此外，照射3min后，效果更明显。卤素光和KTP激光照射顺序的不同不影响漂白效果。

The bleaching was performed on the surface of shell of the chicken egg with dark blown color, using Night White Excel which was based on urea peroxide or Pyrenees which was based on hydrogen peroxide. Halogen light (PENCURE) and KTP laser were used to occurring bleaching reaction. Halogen light and KTP laser were used the bleaching respectively in experiment 1. KTP laser was irradiated with 3W to the egg shell surface for 1 minute and 30 seconds, 3 minutes, and 5 minutes 10 minutes respectively after bleaching reagent application. Halogen light was also irradiated on the shell surface for 1 minute 30 seconds, 3 minutes, 5 minutes 10 minutes respectively same as KTP laser. After irradiation, all specimens were stored at 37 degree for half day and analyzed colored change. In experiment 2, halogen light and KTP laser were combined use together. The irradiated procedures of the halogen light and KTP laser were same as experiment 1. All specimens were also analyzed colored change. As a results, the occurring of the bleaching effect was observed more than three minutes with KTP laser irradiation after Night Excel bleaching agent application in experiment 1. On the other hand, the bleaching effect was confirmed over five minutes with KTP laser irradiations in using reagent of Pyrenees. In halogen light irradiation specimens, the bleaching effect was shown more than one minutes and 30 second irradiation both methods of Night White Excel and Pyrenees application. In experiment 2, the bleaching effect was also appeared more than one minute and 30 second irradiation both methods of Night White Excel and Pyrenees application. Furthermore the effectible was more clearly after 3 minutes irradiation. The difference of the order of irradiating the halogen light and the KTP laser was not influence of the affectability for the bleaching.