Giordano M, Macchi A, Ostinelli E, Tagliabue A
II Facoltà di Medicina e Chirurgia, Università degli Studi, Pavia.
Minerva Stomatol. 1996 Jan-Feb;45(1-2):29-35.
In this work the authors have studied in vivo, the protective action of ultramicronized hydroxylapatite combined with a cement for orthodontic use. An etching gel with 30% acid orthophosphoric for 30'' has been put on a selected group of teeth to be extracted. Then some ultramicronized hydroxylapatite has been applied and some brackets or bands bonded with composite cement. Besides, on another group of teeth selected for the control, some brackets have been bonded with the traditional technique without hydroxylapatite. Some photographic rebuilts of the surface of the teeth to be analysed have been executed at scanning electron microscopy. Further observations have been executed at the aplanatic microscopy stereo to identify the possible macroscopic alterations. The hydroxylapatite proves to have a protective action on the enamel near the orthodontic bands or brackets, fixes with cement and subjected to the action of an acid.
在这项研究中，作者对超微化羟基磷灰石与正畸用粘结剂联合使用的体内保护作用进行了研究。将含30%正磷酸的蚀刻凝胶涂抹在一组选定的待拔除牙齿上30秒。然后应用一些超微化羟基磷灰石，并使用复合粘结剂粘结一些托槽或带环。此外，在另一组选定作为对照的牙齿上，采用不使用羟基磷灰石的传统技术粘结一些托槽。通过扫描电子显微镜对要分析的牙齿表面进行了一些照片重建。在平场立体显微镜下进行了进一步观察，以确定可能的宏观变化。结果表明，羟基磷灰石对正畸带环或托槽附近的牙釉质具有保护作用，它能与粘结剂固定在一起，并能抵抗酸的作用。
