| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
The aim of this study was to evaluate regional shrinkage within a light-cured composite during polymerization by microcomputed tomography. Zirconium oxide spherical fillers (30 μ diameter) were added as markers to a composite resin, filled into a box-shaped class I cavity. The marker fillers were traced in 3D scans obtained by micro-CT before and after polymerization using a software (TRI/3D-BON). The filler particles at the top region moved toward the bottom of
cavity, but at deeper depths, the direction of vertical movement changed toward the top of cavity (irradiated surface). The magnitude and direction of regional polymerization shrinkage depends on boundary conditions. Polymerization shrinkage effect is most significant at the deepest part of the cavity. The application of micro-CT combined with sophisticated image analysis is a novel approach to investigate shrinkage mechanisms of dental composites.
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