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http://dx.doi.org/10.7234/composres.2017.30.6.393

Polymerization Shrinkage Distribution of a Dental Composite during Dental Restoration Observed by Digital Image Correlation Method  

Park, Jung-Hoon (Department of Mechanical Engineering, Graduate School, Hanyang University)
Choi, Nak-Sam (Department of Mechanical Engineering, Hanyang University)
Publication Information
Composites Research / v.30, no.6, 2017 , pp. 393-398 More about this Journal
Abstract
The shrinkage distribution of a dental composite (Clearfil AP-X, Kuraray, Japan) used for dental restoration was observed using a digital image correlation method. In order to analyze the shrinkage distribution formed during and after light irradiation, digital images were taken with different photographing conditions for each period. Optimal photographing conditions during LED irradiation were obtained through a preliminary experiment in which the exposure time was applied from 0.15 ms to 0.55 ms in 0.05 ms intervals. The DIC analysis results showed that the strain was non-uniform. For the initial 20 s of light irradiation the composite resin shrank to the level of 50~60% of the final curing shrinkage. Such large shrinkage amount of the composite resin lump affected the tensile stress concentration near the adhesive region between the composite resin and the substrate.
Keywords
Dental composite resin; Digital image correlation; Polymerization shrinkage; Shrinkage distribution; Methacrylate-based composite resin; Dental restoration;
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Times Cited By KSCI : 1  (Citation Analysis)
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