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KMID : 1035320160430010043
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Korean Society for Dental Materials
2016 Volume.43 No. 1 p.43 ~ p.50
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Effects of Carbon Nanotube Addition on the Mechanical Properties of Dental Glassionomer Cement
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Kim Dong-Ae
Kim Han-Sem
Shin Won-Sang
Lee Hae-Hyoung
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Abstract
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The aim of this study was to investigate the effect of multiwall carbon nanotube functionalized with carboxyl group (MWCNT-COOH) on the mechanical properties of dental glassionomer cement (GIC). MWCNT-COOH was prepared by the acid oxidative method. The MWCNT-COOH was incorporated into a commercial GIC powder or liquid at 0.5 wt% or 1.0 wt%. The net setting time of the cements was measured in accordance with ISO 9917 (Dental water-based cement). Specimens for compressive strength (4 mmφ × 6 mm), diametral tensile strength (6 mmφ × 4 mm) and flexure strength with modulus (2 mm × 2 mm × 25 mm) were prepared by mixing with the cement liquid and kept in water bath of (37±1)℃. Mechanical tests were conducted in 1 d, 7 d, and 14 days at a cross-head speed of 1 mm/min. Compressive strength of GIC mixed with 0.5 wt% MWCNT-COOH increased significantly at 7 d. However, overall mechanical properties of GIC modified with MWCNT were not significantly increased with a delayed setting time, in comparison with control cement. Overall results indicated that the MWCNT/GIC composite cements showed a limited strengthening effect for dental glassionomer cement.
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KEYWORD
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Compressive Strength, Diametral Tensile Strength, Flexural Strength, Glassionomer Cement, Multi-walled Carbon Nanotube(MWCNT), Net Setting Time
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