Bleaching of a tooth is caused by oxygen radical-Mechnism of bleaching of a tooth and influence to dentin of super oxygen-

用磷酸盐缓冲液充填人切牙冠制备人工根管。本研究旨在探讨牙齿美白剂使用后，过氧化物对牙齿的影响。根据说明书使用含有30%过氧化氢或35%过氧化脲的牙齿增白剂，进行或不进行酸蚀预处理。用Luminol-化学发光法测定根管内缓冲液中过氧化氢的渗透量，结果用高浓度过氧化氢水冲洗设计的人工根管并漂白后，在根管间测得大量的过氧化氢。我们的意思是，这通过牙釉质，过氧化氢是一个化妆品的牙齿，牙本质通过漂白操作和渗透。我们观察形态的变化的一分钟组织通过观察百分之一部分的牙齿漂白后。我认识到一些变化，但没有它的情况下，我可以得出结论是它。然而，在将牙齿浸入过氧化氢水中时，识别出牙本质成分的大量溶解。牙本质的组成通过漂白溶解，这件事表明了一种可能性，同时，我经历了一个机会，漂白剂到达牙髓腔，一个根管。

An artificial root canal was prepared using the crown of human incisors filled with phosphate buffer solution. This research was to clarify the effects of peroxide on teeth after the tooth-whitener-application. Tooth-whitener containing 30% hydrogen peroxide or 35% carbamide peroxide was applied according to the instructions with or without acid-etching pretreatment. Luminol-chemi luminescence was used to measure the quantity of peroxide that penetrated into the buffer within the root canal.As a result of we used high density hydrogen peroxide water for the humans tooth crown of a tooth part which we gave the artificial root canal which we devised to and bleached it, and having operated it, a large quantity of hydrogen peroxides were measured between root canals. We mean that this passes the enamel that a hydrogen peroxide is a makeup of a tooth, dentin by bleaching operation and seeped.We observe a change of morphology of a minute organization by observation of a percent section of a tooth after bleaching.I recognize some changes, but there is not it in the situation that I can conclude to be it yet. However, a large quantity of dissolution of a dentin ingredient was recognized in immersion of a tooth to the hydrogen peroxide water. A makeup of dentin dissolves by bleaching, and this thing suggests the possibility that, meanwhile, I go through a chance, and a bleach arrives at to a pulp cavity, a root canal.