Department of Periodontology, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan.
Odontology. 2012 Jan;100(1):41-6. doi: 10.1007/s10266-011-0019-0. Epub 2011 May 10.
The objective of this study is to characterize the defects in the dentin surface after air polishing for three types of polishing powders and five different nozzle distances. Human teeth were embedded in acrylic resin and then polished until the dentin surface became exposed. The nozzle of the polisher was fixed at a specified distance (2, 3, 4, 5, or 6 mm) and orientation (45°) with respect to the dentin surface. The three powders were CLASSIC (NaHCO(3), 65 μm diameter), PERIO (glycine, 25 μm diameter), and SOFT (glycine, 65 μm diameter). With respect to nozzle distance, we find a significant difference in the mean defect depth only at 6 mm. The spray distance of 6 mm produced the shallowest defect depths. This variable had no effect on the defect volume. SOFT powder had significantly less depths and volumes of defects than the other two powders. The contact angle of the dentin increased significantly in all polishing tests, compared to an unpolished dentin surface (control). We find that spray distance of 6 mm from the nozzle of the polisher and orienting on 45° angle produced less dentin surface defects than any other distance in all powder systems used. At this distance, SOFT powder produced statistically significant smaller depth and volume defects than the other two powder groups.
本研究的目的是描述三种抛光粉和五种不同喷嘴距离对牙本质表面的缺陷特征。将人类牙齿嵌入丙烯酸树脂中，然后进行抛光，直至牙本质表面暴露出来。抛光机的喷嘴以特定的距离（2、3、4、5 或 6 毫米）和方向（45°）固定在牙本质表面上。三种粉末分别为 CLASSIC（碳酸氢钠，65μm 直径）、PERIO（甘氨酸，25μm 直径）和 SOFT（甘氨酸，65μm 直径）。就喷嘴距离而言，我们仅在 6 毫米处发现平均缺陷深度存在显著差异。6 毫米的喷雾距离产生的缺陷深度最浅。该变量对缺陷体积没有影响。与另外两种粉末相比，SOFT 粉末的缺陷深度和体积明显较小。与未经抛光的牙本质表面（对照）相比，所有抛光测试中的牙本质接触角均显著增加。我们发现，与使用的所有粉末系统中的其他距离相比，从抛光机喷嘴 6 毫米的距离和以 45°角定位会产生较少的牙本质表面缺陷。在这个距离下，SOFT 粉末产生的深度和体积缺陷明显小于另外两种粉末组。
