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EFFECT OF CORE-SHELL PARTICLES ON PHYSICAL PROPERTIES OF DENTAL COMPOSITES
최경규,
소속 상세정보
최경규 ( ) - 경희대학교 치과대학 보존학교실
KMID : 0362319980230020690
Abstract
Rubber-toughened particles which are used in the field of chemical engineering are used to increase the fracture toughness of thermoset resin. The applicatibn, of Core-Shell particles, one of rubber-toughened particles, as a filler for dental composite or restoration have not been examined.
The purpose of this study was to evaluate possible use of Core-Shell particles for dental composite, and the hypothesis was that additional toughening mechanisms are activated by the addition of Core-Shell particles. After blending 50vol% quartz with Bis-GMA/TEGDMA resin matrix, the experimental resins were made by the addition of Core-Shell particles with varied content level as 0, 2.5, 5, 7.5, 10, 12.5, 15, and 20wt%. Fracture toughness was determined on three-point bending specimen with single-edge notch according to ASTM-E 399. Also, flexural properties, that is, strength and modulus were measured by three-point bending testing. Fractogragh of fracture toughness specimen was observed using SEM (JEOL 6400 SEM, MA).
The following results from this study were obtained ;
1. Fracture toughness of composite resin added 2.5wt% Core-Shell particles was significantly higher than control group (p≤0.05).
2. Flexural properties were decreased with increasing Core-Shell particle content, which showed a correlation statistically (p≤0.05).
3. A toughening mechanism such as lamination and microcrack was observed in specimen determined high fracture toughness.
4. The dispersion of Core-Shell itself and quartz filler particles was limited present high con-tent of Core-Shell particles, which decreased a resulting mechanical properties of composites.
These results suggest that adequate Core-Shell particles can be used to enhance mechanical properties included toughening for dental composites.
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