탄소나노튜브 첨가에 의한 치과용 글라스아이오노머 시멘트의 기계적 특성
Effects of Carbon Nanotube Addition on the Mechanical Properties of Dental Glassionomer Cement
김동애, 김한샘, 신원상, 이해형,
소속 상세정보
김동애 ( Kim Dong-Ae ) - 단국대학교 치과대학 생체재료학교실
김한샘 ( Kim Han-Sem ) - 단국대학교 대학원 나노바이오의과학과
신원상 ( Shin Won-Sang ) - 대한장애인체육회
이해형 ( Lee Hae-Hyoung ) - 단국대학교 치과대학 생체재료학교실
KMID : 1035320160430010043
Abstract
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.
키워드
Compressive Strength; Diametral Tensile Strength; Flexural Strength; Glassionomer Cement; Multi-walled Carbon Nanotube(MWCNT); Net Setting Time
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