Esberard Roberta, Esberard Renata R, Esberard Roberto M, Consolaro Alberto, Pameijer Cornelis H
Department of Pathology, Bauru Dental School, University of São Paulo, Brazil.
Am J Dent. 2007 Aug;20(4):245-9.
To evaluate the effect of various bleaching agents on the cemento-enamel junction (CEJ) of human teeth by scanning electron microscopy (SEM) analysis.
30 intact teeth were selected and longitudinally sectioned, yielding 60 specimens. Thirty specimens served as controls; the other 30 were divided into six groups with five specimens each (n = 5) and bleached according to six protocols (Group 1: External bleaching with 10% carbamide peroxide; Group 2: External bleaching with 35% hydrogen peroxide; Group 3: External bleaching with 35% hydrogen peroxide; Group 4: Internal/external bleaching with 35% hydrogen peroxide; Group 5: Internal/external bleaching with 35% hydrogen peroxide; and Group 6: Intracoronal bleaching with a paste of sodium perborate mixed with 9% hydrogen peroxide). After treatment the specimens were prepared and examined in a scanning electron microscope.
The bleaching agents used in this study caused morphological changes in the CEJ and increased dentin exposure.
通过扫描电子显微镜（SEM）分析评估各种漂白剂对人牙齿牙骨质-釉质界（CEJ）的影响。
选取30颗完整牙齿并纵向切片，得到60个标本。30个标本作为对照；另外30个分为六组，每组五个标本（n = 5），并根据六种方案进行漂白（第1组：用10%过氧化脲进行外部漂白；第2组：用35%过氧化氢进行外部漂白；第3组：用35%过氧化氢进行外部漂白；第4组：用35%过氧化氢进行内部/外部漂白；第5组：用35%过氧化氢进行内部/外部漂白；第6组：用与9%过氧化氢混合的过硼酸钠糊剂进行冠内漂白）。处理后，制备标本并在扫描电子显微镜下检查。
本研究中使用的漂白剂导致CEJ出现形态变化并增加牙本质暴露。
