Department of Conservative Dentistry & Endodontics, Dr. Ziauddin Ahmed Dental College & Hospital, Aligarh Muslim University, Aligarh, India.
Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India.
Int Endod J. 2019 May;52(5):701-708. doi: 10.1111/iej.13035. Epub 2018 Nov 27.
To evaluate the extraradicular peroxide release from sodium percarbonate compared to sodium perborate as an intracoronal bleaching agent.
Sixty mandibular single-rooted premolars with intact CEJ were selected. After root filling, gutta-percha was removed 4 mm apical to CEJ and 2 mm of GIC was condensed over the root filling. Intracoronal bleaching agents were placed into six groups of teeth (n = 10): sodium perborate with distilled water (SPW); sodium percarbonate with distilled water (SPCW); sodium perborate with 30% hydrogen peroxide (SPHP); sodium percarbonate with 30% hydrogen peroxide (SPCHP); 30% hydrogen peroxide as positive control (HP) and distilled water as negative control (CL). The teeth were then mounted in vials filled with distilled water, kept in an incubator and taken out at 1, 3 and 6 days for spectrophotometric analysis. Extraradicular peroxide release was quantified by the ferrothiocyanate method. Statistical analysis was undertaken with one-way anova and Scheffe post hoc tests.
The greatest peroxide release occurred in the HP group, followed by the SPCHP and SPHP groups, and then by the SPCW and SPW groups. Intergroup comparison revealed that there was no significant difference in peroxide release among the groups SPCW and SPW on days 1, 3 and 6 (P > 0.05). Similarly, no significant difference was found between the SPCHP and SPHP treated groups on days 1, 3 and 6 (P > 0.05).
Extraradicular peroxide release from sodium percarbonate was comparable to that of sodium perborate, as the differences were not significant.
评估过碳酸钠（SPC）相对于过硼酸钠（SPB）作为根管内漂白剂的根管外过氧化氢释放。
选择 60 颗下颌单根前磨牙，CEJ 完整。根管充填后，去除距 CEJ 根尖 4mm 处的牙胶，在根管充填上方用 2mm 的玻璃离子水门汀（GIC）压缩。将根管内漂白剂分别置于 10 个牙的 6 个组中：过硼酸钠加蒸馏水（SPW）；过碳酸钠加蒸馏水（SPCW）；过硼酸钠加 30%过氧化氢（SPHP）；过碳酸钠加 30%过氧化氢（SPCHP）；30%过氧化氢阳性对照（HP）；蒸馏水阴性对照（CL）。然后将牙齿装入装有蒸馏水的小瓶中，置于孵育器中，在第 1、3 和 6 天取出进行分光光度分析。用亚铁氰化钾法定量测量根管外过氧化氢释放量。采用单因素方差分析和 Scheffe 事后检验进行统计学分析。
HP 组的过氧化氢释放量最大，其次是 SPCHP 和 SPHP 组，然后是 SPCW 和 SPW 组。组间比较显示，在第 1、3 和 6 天，SPCW 和 SPW 组之间的过氧化氢释放量无显著差异（P>0.05）。同样，在第 1、3 和 6 天，SPCHP 和 SPHP 处理组之间也未发现显著差异（P>0.05）。
SPC 根管外的过氧化氢释放量与 SPB 相当，差异无统计学意义。
