Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Regeneration of a Micro-Scratched Tooth Enamel Layer by Nanoscale Hydroxyapatite Solution

  • Ryu, Su-Chak (College of Nanoscience and Nanotechnology, Pusan National University) ;
  • Lim, Byoung-Ki (College of Nanoscience and Nanotechnology, Pusan National University) ;
  • Sun, Fangfang (College of Nanoscience and Nanotechnology, Pusan National University) ;
  • Koh, Kwang-Nak (College of Nanoscience and Nanotechnology, Pusan National University) ;
  • Han, Dong-Wook (College of Nanoscience and Nanotechnology, Pusan National University) ;
  • Lee, Jae-Beom (College of Nanoscience and Nanotechnology, Pusan National University)
  • Published : 2009.04.20
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Abstract

Hydroxyapatite (HAp)-based materials have attracted considerable attention on account of their excellent stability and recrystallization. Nanoscale HAp powders with a mean particle size of 200 nm were used to regenerate the enamel layers of damaged teeth. An artificially scratched tooth was immersed in a nanoscale HAp powder suspension in d.i. water (HAp of 70 wt%) at 37 ${^{\circ}C}$ for a period of 1~3 months. SEM and AFM showed that the scratched surface was ultimately inlaid with HAp after three months and the roughness increased from 2.80 to 5.51. Moreover, the hardness of the neo-generated HAp layer on the crown was similar to that of the innate layer. $Ca^{2+}$ and ${PO_4}^{3-}$ ions from the HAp powders dissolved in d.i. water were precipitated on the tooth to produce cemented pasteson the enamel surface due to its high recrystallizing characteristics, resulting in a hard neo-regenerated HAp layer on the enamel layer. This nanoscale HAp powder solution might be used to heal decayed teeth as well as to develop tooth whitening appliances.

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