Rotstein I, Lehr Z, Gedalia I
Hebrew University-Hadassah Faculty of Dental Medicine, Jerusalem.
J Endod. 1992 Jun;18(6):290-3. doi: 10.1016/s0099-2399(06)80956-8.
The effect of bleaching agents on the inorganic composition of human dentin and cementum was examined. Intact teeth were crushed, pulverized, and separated to dentin and cementum powders. The pulverized tissues were exposed to treatments with 30% H2O2, 3% H2O2, 2% sodium perborate in 30% H2O2, 2% sodium perborate in 3% H2O2, and 2% sodium perborate in bidistilled water for periods of 15 min and 1, 24, and 72 h. The degree of dissolution and the percentage of inorganic material for both dentin and cementum were measured. Thirty percent H2O2 and 2% sodium perborate in 30% H2O2 treatments significantly increased the solubility of dentin and cementum. The degree of dissolutions and the percentage of inorganic material remaining in the undissolved dentin and cementum increased with time progression. The greatest increase occurred with 30% H2O2 and 2% sodium perborate in 30% H2O2 after 24- and 72-h treatments. It is concluded that 30% hydrogen peroxide treatment may cause alteration in the chemical structure of the dentin and cementum making them more susceptible to degradation.
研究了漂白剂对人牙本质和牙骨质无机成分的影响。将完整的牙齿碾碎、磨成粉末，然后分离出牙本质和牙骨质粉末。将磨碎的组织分别用30%过氧化氢、3%过氧化氢、30%过氧化氢中含2%过硼酸钠、3%过氧化氢中含2%过硼酸钠以及双蒸水中含2%过硼酸钠处理15分钟、1小时、24小时和72小时。测量了牙本质和牙骨质的溶解程度以及无机物质的百分比。30%过氧化氢和30%过氧化氢中含2%过硼酸钠的处理显著增加了牙本质和牙骨质的溶解度。随着时间的推移，未溶解的牙本质和牙骨质中的溶解程度以及剩余无机物质的百分比增加。在24小时和72小时处理后，30%过氧化氢和30%过氧化氢中含2%过硼酸钠的处理增加幅度最大。得出的结论是，30%过氧化氢处理可能会导致牙本质和牙骨质的化学结构发生改变，使其更容易降解。
