글래스아이오노머에 대한 나노 하이드록시아파타이트의 최적 첨가 비율 (나노 하이드록시아파타이트의 첨가 비율에 따른광중합형 글래스아이오노머의 결합강도와 탈회저항성의 변화 비교)
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)
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초록
이 연구의 목적은 광중합형 글래스아이오노머인 Fuji II LCTM를 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 탈회양상과파절 양상을 관찰하였다. 결합강도 실험 결과 HA의 함량이 증가하면서 결합강도는 증가하여 HA-15 군에서 최대치를 기록하였다(p < 0.05). 탈회저항성 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.
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.
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