Journal of the Korean Academy of Pediatric Dentistry 2010;37(1):24-34.
Published online February 28, 2010.
THE EFFECTS OF NANO-SIZED HYDROXYAPATITE ON DEMINERALIZATION RESISTANCE AND BONDING STRENGTH IN LIGHT-CURED GLASS IONOMER DENTAL CEMENT
Ji-Hee Kim1, Yong-Keun Lee2, Seong-Oh Kim1, Je-Seon Song1, Byung-Jai Choi1, Hyung-Jun Choi1
1Department of pediatric Dentistry, Department of pediatric Dentistry and Oral Science Research Center
2Department of Dental materials & bioengineering, College of Dentistry, Yonsei University 
Correspondence:  Hyung-Jun Choi,  Tel: 02-2228-8800, Email: choihj88@yuhs.ac
Received: 15 February 2009   • Accepted: 5 February 2010
Abstract
The aim of this study was to evaluate the effect of incorporated nano HA on the demineralization resistance and bonding strength of LC GIC in comparison with micro HA. Fuji II LC GIC was used as the control group and a base material for experimental groups. Two experimental groups were prepared. One was prepared by adding 15% micro HA to LC GIC by weight ratio (Exp. 1), and the other was prepared by adding 15% nano HA instead (Exp. 2). According to the results, the following conclusions could be obtained. 1. Observing under the CLSM, the control group showed thicker enamel demineralization layer than in the experimental groups, and the Exp. 2 group showed the thinnest demineralization layer. 2. In SEM analysis, there was greater enamel demineralization in the control group. The Exp. 2 group was more resistant to demineralization compared to the Exp. 1 group. 3. The bonding strength was found to be in the increasing order of control, Exp. 1, and Exp. 2 group (p < 0.05). 4. Observing the fractured surfaces under SEM after the bonding strength test was performed, there were bone-like apatite particles formed in HA-added experimental groups, and a greater number of bone-like apatite particles were formed in the Exp. 2 group compared to the Exp. 1 group.
Key Words: Light-cured glassionomer cement, Nano-sized hydroxyapatite, Demineralization resistance, Bonding strength


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