Department of Periodontology, The Nippon Dental University, School of Life Dentistry at Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan.
Odontology. 2010 Feb;98(1):31-6. doi: 10.1007/s10266-009-0113-8. Epub 2010 Feb 16.
We examined the abrasiveness of glycine powders with particle diameters of 63 and 100 mum by measuring the depth and volume of defects produced during air polishing of human dentin. A total of 36 extracted human teeth were embedded in acrylic resin. The resin blocks were polished until the dentin surfaces were exposed. The nozzle of an air polisher was mounted 4 mm from the dentin surface, and the dentin surface was treated for 5 s at one of two angles of incidence (45 degrees or 90 degrees). Three materials were used in the polishing process: NaHCO(3) powder with a mean particle diameter of 100 microm (Handy Jet Powder), glycine powder with a mean particle diameter of 63 microm (Handy Jet Powder PMTC), and glycine powder with a mean particle diameter of 100 microm (Handy Jet Powder Recall). The defect depth at both angles was significantly deeper after treatment with Handy Jet Powder or Handy Jet Powder PMTC. The defect volume was the greatest with Handy Jet Powder, followed by Handy Jet Powder PMTC, and Handy Jet Powder Recall. The larger diameter glycine powder resulted in less damage to the dentin.
我们通过测量在对人牙本质进行空气抛光时产生的缺陷的深度和体积，来检查粒径为 63 和 100 微米的甘氨酸粉末的研磨性。共将 36 颗人牙嵌入丙烯酸树脂中。当牙本质表面暴露时，树脂块被抛光。空气抛光器的喷嘴距离牙本质表面 4 毫米，并且牙本质表面以两种入射角（45 度或 90 度）中的一个处理 5 秒。在抛光过程中使用了三种材料：平均粒径为 100 微米的碳酸氢钠粉末（Handy Jet Powder）、平均粒径为 63 微米的甘氨酸粉末（Handy Jet Powder PMTC）和平均粒径为 100 微米的甘氨酸粉末（Handy Jet Powder Recall）。在使用 Handy Jet Powder 或 Handy Jet Powder PMTC 处理后，两个角度的缺陷深度都显著变深。缺陷体积最大的是 Handy Jet Powder，其次是 Handy Jet Powder PMTC，然后是 Handy Jet Powder Recall。较大粒径的甘氨酸粉末对牙本质的损伤较小。
