Abstract
The purpose of this study was to investigate cross-polarization-optical coherence tomography (CP-OCT) signal attenuation through different resin material compositions. Four distinct composite systems were used: Filtek supreme ultra (FSU) (3M ESPE), IPS empress direct (EMD) (Ivoclar Vivadent), estelite sigma quick (SQK) (Tokuyama Dental), and Z100 (3M ESPE). Cross-sectional images of different composite-demineralized phantoms (n = 108) were collected using a 1310-nm intraoral cross-polarization swept source OCT (CP-OCT) imaging system. %T quantified the CP-OCT signal attenuation. Scanning electron microscopy, transmission electron microscopy, and energy-dispersive x-ray spectrometer chemical analysis was utilized to determine how different matrix/filler compositions affected attenuation of the near infrared (NIR) signal. CP-OCT imaging of dental resin composites showed enormous variation in signal attenuation. For each of our composite systems, there was not a consistent attenuation difference in the NIR signal for A to D shades. The four composites had similar measured backscattering values but attenuated the overall signal to different degrees. When comparing the A2 shades between the four different composite systems, the order of highest to lowest of %T was EMD > Z100, FSU > SQK (ANOVA, Tukey, p < 0.0001). As a result, we demonstrate the importance of understanding how the constituents of composite materials affect CP-OCT signal attenuation.
Original language | English (US) |
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Article number | 106002 |
Journal | Journal of biomedical optics |
Volume | 17 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2012 |
Bibliographical note
Funding Information:This work was supported by NIH Grant 1R01DE021366-01, 3M Foundation Nontenured Faculty Award, and the University of Minnesota. Parts of this work were carried out in the University of Minnesota I.T. Characterization Facility, which receives partial support from NSF through the NNIN program. The study would like to thank Conrado Aparicio and Ruoqiong Chen for their contributions. The study would also like to thank Tokuyama Dental and 3M ESPE for partial material donations and Rich Russin at 3M for his assistant in interpreting published technical reports.
Keywords
- Materials
- Medical imaging
- Medicine
- Optical properties
- Particle sizing
- Polarization