Journal of the korean academy of Pediatric Dentistry (대한소아치과학회지)

Korean Academy of Pediatric Dentistry (대한소아치과학회)
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The Optimum Addition Ratio of Nano Hydroxyapatite to Glass Ionomer Dental Cement (Changes in Demineralization Resistance and Bonding Strength of Light Cured Glass Ionomer after the Addition of Nano Hydroxyapatite in Various Ratio)

글래스아이오노머에 대한 나노 하이드록시아파타이트의 최적 첨가 비율(나노 하이드록시아파타이트의 첨가 비율에 따른광중합형 글래스아이오노머의 결합강도와 탈회저항성의 변화 비교)

  • Kim, Nam Hyuk (Department of Pediatric Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University) ;
  • Kim, Seong Oh (Department of Pediatric Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University) ;
  • Song, Je Seon (Department of Pediatric Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University) ;
  • Lee, Jae Ho (Department of Pediatric Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University) ;
  • Son, Heung Kyu (Department of Pediatric Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University) ;
  • Choi, Byung Jai (Department of Pediatric Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University) ;
  • Choi, Hyung Jun (Department of Pediatric Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University)
  • 김남혁 (연세대학교 치과대학 소아치과학교실, 구강과학연구소) ;
  • 김성오 (연세대학교 치과대학 소아치과학교실, 구강과학연구소) ;
  • 송제선 (연세대학교 치과대학 소아치과학교실, 구강과학연구소) ;
  • 이제호 (연세대학교 치과대학 소아치과학교실, 구강과학연구소) ;
  • 손흥규 (연세대학교 치과대학 소아치과학교실, 구강과학연구소) ;
  • 최병재 (연세대학교 치과대학 소아치과학교실, 구강과학연구소) ;
  • 최형준 (연세대학교 치과대학 소아치과학교실, 구강과학연구소)
  • Received : 2012.09.12
  • Accepted : 2013.06.11
  • Published : 2013.08.30
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Abstract

The aim of this study was to evaluate changes in demineralization resistance and bonding strength of light cured glass ionomer after the addition of nano hydroxyapatite in various ratios. Fuji II LC GIC (GC Co., Japan) was used as the control group and also as a base material for experimental group. HA was mixed into the RMGIC at various ratio to create a HA-LC GIC mixture, preparing six experimental groups, i.e. 5%, 10%, 15%, 20%, 25%, 30% HA-LC GIC. According to the results, the bonding strength increased due to the addition of HA, showing the maximum value at the 15% nano HA group (p < 0.05). Under CLSM observation after 4 days of demineralization, the HA groups were more resistant to demineralization compared to the control group. No significant difference was observed between HA groups. In analysis through SEM, the HA groups showed attachment of granular materials and decreased demineralized tooth surfaces under influence of HA particles.

이 연구의 목적은 광중합형 글래스아이오노머인 Fuji II $LC^{TM}$를 대조군으로 삼고 다양한 비율의 나노 하이드록시아파타이트(HA ; hydroxyapatite)를 첨가하여 최적의 물성을 나타내는 HA의 첨가비율을 알아보는 것이다. 각각 무게비로 5~30%의 나노 HA를 첨가하여 HA-5, HA-10, HA-15, HA-20, HA-25, HA-30의 여섯 개의 실험군을 설정하였으며 ISO 9917-2:2004 기본 규정에 따른 물리적 성질과 탈회저항성, 결합강도 실험을 시행하고 주사전자 현미경을 통해 탈회양상과 파절 양상을 관찰하였다. 결합강도 실험 결과 HA의 함량이 증가하면서 결합강도는 증가하여 HA-15 군에서 최대치를 기록하였다(p < 0.05). 탈회 저항성 실험으로 4일간의 탈회 후 CLSM을 이용하여 탈회면을 관찰한 결과, HA 첨가군에서 탈회 구간의 감소가 나타났으나 HA의 첨가량에 따른 유의한 차이는 없었다. 주사전자현미경 상에서 탈회면을 관찰한 결과에서는HA 입자가 탈회된 법랑질의 미세공극을 채우고 있는 양상이 나타났다.

Keywords

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