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Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation
Published on: July 21, 2014
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Assessments of polymerization shrinkage by optical coherence tomography-based digital image correlation analysis-Part
Wei-Chi Chen1, Shu-Fen Chuang2, Po-Chun Tseng3
1School of Dentistry and Institute of Oral Medicine, National Cheng Kung University, Tainan, Taiwan; Department of Dentistry, Sin-Lau Hospital, Tainan, Taiwan.
Summary
Optical coherence tomography (OCT)-based digital image correlation (DIC) is feasible for measuring dental material polymerization shrinkage. Blank materials yield the best results, avoiding reflective particles for accurate analysis.
Area of Science:
- Biomaterials Science
- Dental Materials
- Optical Metrology
Background:
- Polymerization shrinkage of resin-based dental composites is a significant clinical concern.
- Accurate measurement of this shrinkage is crucial for material development and clinical success.
- Existing measurement techniques may have limitations in precision or applicability.
Purpose of the Study:
- To evaluate the feasibility of using optical coherence tomography (OCT) combined with digital image correlation (DIC) for measuring polymerization shrinkage.
- To identify optimal experimental parameters for OCT-based DIC analysis.
- To assess the impact of material composition on analysis quality.
Main Methods:
- Class I cavities in bovine incisors were filled with a flowable resin (Filtek Z350XT Flowable).
- OCT imaging was performed on polymerized restorations, with virtual and physical displacement methods used for DIC analysis.
- The effect of subset sizes on DIC accuracy and the influence of added particles (glass beads, zirconia) were investigated.
Main Results:
- OCT-based DIC analysis demonstrated high correlation (>99.99%) for virtual movements and low errors (<5.21%) for physical movements.
- An optimal subset size of 51x51 pixels was identified for balancing accuracy and computation time.
- Adding reflective particles (glass beads, zirconia) interfered with OCT imaging, compromising DIC analysis; blank material provided the best results.
Conclusions:
- OCT-based DIC analysis is a feasible method for measuring polymerization shrinkage in resin-based dental restorations.
- Careful selection of subset size is essential for optimizing DIC analysis parameters.
- The use of hyper- or hypo-reflective particles is not recommended for this OCT-DIC methodology.
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