Weiger R, Kuhn A, Löst C
Department of Conservative Dentistry, School of Dental Medicine, University of Tübingen, Germany.
J Endod. 1994 Jul;20(7):338-41. doi: 10.1016/S0099-2399(06)80096-8.
Fifty-eight extracted incisors were artificially stained to compare the efficacy of sodium perborate preparations used for intracoronal bleaching. All teeth were bleached for a 6-day period and the bleaching pastes replaced at days 1 and 3 (walking bleach technique). Sodium perborate-monohydrate, trihydrate, or tetrahydrate in conjunction with 30% H2O2 as well as tetrahydrate, either mixed with H2O or prepared as an experimental gel, were placed intracoronally at a level of 1-mm below the vestibular cementoenamel junction. Standardized slides were used to evaluate the color changes during bleaching. Success rates between 46 and 77% could be achieved, but no significant differences in final bleaching results between any of the sodium perborate types were observed. The use of the experimental gel resulted in comparable esthetic results (54%), although the portion of tetrahydrate in the gel was lower than that of the other preparations. In contrast to general recommendations that bleaching agents be left for 3 to 7 days in the access cavity before replacement, shorter bleaching intervals did not seem to affect the success.
58颗拔除的切牙被人工染色，以比较用于冠内漂白的过硼酸钠制剂的效果。所有牙齿均漂白6天，并在第1天和第3天更换漂白糊剂（动态漂白技术）。将一水合、三水合或四水合过硼酸钠与30%过氧化氢联合使用，以及将四水合过硼酸钠与水混合或制成实验性凝胶，置于冠内，位于前庭牙骨质釉质界下方1毫米处。使用标准化玻片评估漂白过程中的颜色变化。成功率可达46%至77%，但未观察到任何一种过硼酸钠类型在最终漂白结果上有显著差异。使用实验性凝胶可获得类似的美学效果（54%），尽管凝胶中四水合过硼酸钠的比例低于其他制剂。与一般建议在更换前将漂白剂留在进入腔3至7天相反，较短的漂白间隔似乎并不影响成功率。
