Physical properties of resin-reinforced glass ionomer cement modified with micro and nano-hydroxyapatite.
Hydroxyapatite is a biologically compatible material and a major component of dental enamel and bone tissue. Because of its biocompatibility and structural similarity to human teeth and the skeletal system, a number of dental studies have evaluated its application as a bone substitute or dental restorative material. This study was to evaluate the differences in bonding strength and resistance to demineralization between micro-hydroxyapatite and nano-hydroxyapatite added to self-cured resin-reinforced/modified glass ionomer cement. RelyX was used as the base glass ionomer cement material and for the control group. 10% micro-hydroxyapatite added glass ionomer cement was named experimental group 1, and 10% nano-hydroxyapatite added glass ionomer cement was named experimental group 2. Physical tests for ISO9917-1:2007 in each group was acceptable, except the setting time of nano-hydroxyapatite added glass ionomer cement, which exceeded maximum setting time. Bonding strength was greatest in nano-hydroxyapatite glass ionomer cement, and cohesive failure was common in all specimens. When fractured surface was observed under SEM, spherical particles were observed in experimental groups containing hydroxyapatite particles, and they were more prevalent in nano-HA added glass ionomer cement group than in micro-hydroxyapatite added group. Both experimental groups exhibited greater resistance to demineralization compared to the control group, and there was no significant difference between the experimental groups. Under SEM, nano-hydroxyapatite added glass ionomer cement exhibited increased resistance to demineralization compared to micro-hydroxyapatite added glass ionomer cement.
Department of Pediatric Dentistry, College of Dentistry, Yonsei University, 250 Seongsan-no, Seodaemun-gu, Seoul 120-752, South Korea.
Jong-Jin
JJ
Lee
Yong-Keun
YK
Lee
Byung-Jai
BJ
Choi
Jae-Ho
JH
Lee
Hyung-Jun
HJ
Choi
Heung-Kyu
HK
Son
Ji-Won
JW
Hwang
Seong-Oh
SO
Kim
D000704:Analysis of Variance; D003743:Dental Enamel / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006882:Hydroxyapatites / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry*; D019279:Resin Cements / Q000737:chemistry*; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013718:Tensile Strength
D005899:Glass Ionomer Cements; D006882:Hydroxyapatites; D019279:Resin Cements