Evaluation of resin composite polymerization by micro-CT imaging.

2014 Fiscal Year Final Research Report

• Project/Area Number: 23792164
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Conservative dentistry
• Research Institution: Tokyo Medical and Dental University
• Principal Investigator: CHO Eitetsu 東京医科歯科大学, 歯学部, 非常勤講師 (50431929)
• Project Period (FY): 2011-04-28 – 2015-03-31
• Keywords: 光重合型コンポジットレジン / 重合収縮 / マイクロＣＴ

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.

Free Research Field

保存修復学