필러의 실란처리농도가 복합레진의 특성에 미치는 영향
Influences of silane concentration for filler silanization on the properties of composites
소속 상세정보
조태희
박상진
KMID : 0362320010260010023
Abstract
The purpose of this study was to search the optimal silane concentrations for filler- silanization of seven experimental composites.
Silica filler was a 25 micron crushed type. 0.0%, 0.5%, 1.0%, 1.5%, 2.0%, and 3.0% silane(r-methacrylooxypropyltrimethoxysilane) were added into silica-filler with weight percentage(wt%). Mixtures (silica filler/silane)were reacted at 60℃ for 72hours, and crushed into fine particles those were used as fillers for 7 experimental composites. Monomer was a 3:1 mixture of Bis-GMA and TEGDMA containing 0.2% tertiary amine and 0.4% camphoroquinone for light curability. A ratio for mixing the monomer and filler was 75% and 25% respectively. Seven experimental composites was classified with the concentration of silane treated, and the specimen number for each test was 10. Specimens with 6mm diameter and 3mm height dimension for measuring the diametral tensile strength were destroyed with 1mm/min cross-head speed on Instron universal testing machine (No. 4467, USA). Shear bond strength was measured on the specimens bonded to bovine enamel etched with 37% phosphoric acid solution for 1 minute. Fractured surfaces were observed by SEM (Hitachi S-3200, Japan) among that of the highest values measured from each groups.
Following results were obtained:
1.Experimental compositeds containing silanized filler showed the significantly higher diametral tensile strength and shear bond strength than the composites containing un-silanized fillers(Group1) (p<0.05).
2.In silanized filler composite resins(Group 2~7), Diametral tensile strength of Group 3 showed the significantly higher than that of Group 2 and Group 6(p<0.05).
3.Shear bond strength was higher in Group 3 than that of Group 7 (p<0.05)in silanized fillers composite resins.
4.Fracture surface was formed in resin matrixes on the specimens from composites containing the fillers treated with 0.5%, 1.0%, and 1.5% silane.
These results mean that the optimal silane concentrations are exist for each filler with its size and surface area, and that 1.0% is a optimal value for concentration to coat the 25㎛ filler with silane.
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