Rotstein I, Friedman S
Department of Endodontics, The Hebrew University--Hadassah Faculty of Dental Medicine, Jerusalem.
J Endod. 1991 Aug;17(8):376-9. doi: 10.1016/S0099-2399(06)81988-6.
Intracoronal bleaching of pulpless teeth with 30% hydrogen peroxide may result in external cervical root resorption. One of several suggested etiological factors associated with this complication is the pH of the bleaching materials. Because the available data on the pH values of bleaching materials were conflicting, it was the purpose of this study to measure the pH of the materials commonly used for bleaching pulpless teeth. The pH of different concentrations of sodium perborate and 30% hydrogen peroxide, alone or in combination, were measured for a period of 14 days. Sodium perborate was confirmed to be alkaline, whereas 30% hydrogen peroxide was acidic. The pH of the materials when mixed together gradually changed from acidic to alkaline as the concentration of sodium perborate was increased. A thick clinical consistency mixture of both materials was alkaline, and its alkalinity increased with time. These results do not support the theory relating bleaching-induced root resorption to an acidic pH of the bleaching pastes.
用30%过氧化氢对无髓牙进行冠内漂白可能会导致颈缘牙根外吸收。与这种并发症相关的几个推测病因之一是漂白材料的pH值。由于关于漂白材料pH值的现有数据相互矛盾，本研究的目的是测量常用于无髓牙漂白的材料的pH值。对不同浓度的过硼酸钠和30%过氧化氢单独或混合后的pH值进行了为期14天的测量。过硼酸钠被证实呈碱性，而30%过氧化氢呈酸性。当两种材料混合在一起时，随着过硼酸钠浓度的增加，其pH值逐渐从酸性变为碱性。两种材料的浓稠临床稠度混合物呈碱性，且其碱度随时间增加。这些结果不支持将漂白诱导的牙根吸收与漂白糊剂的酸性pH值相关联的理论。
