Study on A Reasonable Treatment of Exposed Root Surface Caries and Hypersensitibity for The Aged

在日本，随着老年人口的增加，老年人的牙根面龋病和因牙周边缘退缩而暴露的根面过敏的比例也在不断增加。因此，这项研究旨在消除暴露的根面的过敏性，并额外防止颈部和根面龋齿。根据1989~1991年的研究结果，发现了以下结果：建立了适当的临床程序，以消除暴露的根面的过敏反应。即暴露的根面用IO-2OCa溶液处理后，用水冲洗干燥，再用SA溶液涂抹干燥，然后涂上双固化型粘结剂。然后，将含有33%重量百分比的有机复合填料颗粒的低粘度复合树脂衬里用刷子涂抹并光固化。在下一次预约时，固化的衬垫将通过常规技术完成和抛光。临床试验表明，该技术和材料对猴牙无刺激性，完全消除了过敏反应。此外，宫颈病变的超微结构在结构和进展上与冠状病变不同。在未来，我们计划在低粘度复合树脂中使用的聚合物中加入氟化物。

In Japan, the percentage of root surface caries and hypersensitibity of exposed root surface due to retraction of gum margin in the mouth of the aged people increases constantly accompanying with the increase of population of the aged people. Therefore, this study was designed in order to remove the hypersensitibity of the exposed root surface and additionally protect from cervical and root surface caries. According to the project performed from 1989 through 1991, the following results were found ;The proper clinical procedure was established to remove the hypersensitibity of the exposed root surfaces. Namely, the exposed root surface is treated with IO-2OCa solution and washed with water and dried, and applied with SA solution and dried followed by application of a dual-cure type bonding agent. Then a low viscosity composite resin liner containing 33 weight percent of an organic complex filler particles is painted by a brush and light-cured. At the next appointment the cured liner is finished and polished by a routine technique. This technique and materials showed no pulpal irritation with monkey teeth and removed hypersensitibity completely in the clinical trial. Furthermore, the ultrastructure of the cervical lesion showed the difference from the coronal lesion in structure and progress. In the future, we are planning to incorporate a fluoride into the polymers which is used in the low viscosity composite resin.