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http://dx.doi.org/10.7234/kscm.2012.25.6.236

Evaluation of Delamination of Dental Composite Restoration using Infrared Lock-in Thermography  

Gu, Ja-Uk (한양대학교 대학원 기계공학과)
Choi, Nak-Sam (한양대학교 기계공학과)
Publication Information
Composites Research / v.25, no.6, 2012 , pp. 236-240 More about this Journal
Abstract
The purpose of this study was to investigate the feasibility on the detection of dental composite delamination using a lock-in thermography method. Amplitude and phase images of detected thermal signals were analyzed according to the lock-in frequencies. At a lock-in frequency of 0.05 Hz, the ligament thickness of 0.5 mm in the specimen exhibited the highest amplitude contrast between defective area and sound area. For ligament thicknesses of 1 mm and 1.5 mm, delamination detection was possible at 0.025 Hz and 0.01 Hz through the amplitude differences. At lock-in frequencies of 0.006 Hz and 0.01 Hz, ligament thickness 0.5 mm exhibited the highest phase contrast. For ligament thicknesses of 1 mm and 1.5 mm, the phase contrast exhibited possible detection of delamination at 0.006-0.1 Hz.
Keywords
lock-in thermography; dental composite restoration; non-destructive inspection; internal delamination;
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