Optical coherence tomography of glass reinforced polymer composites

Dunkers, Joy P.; Parnas, Richard S.; Zimba, Carl G.; Peterson, Richard; Flynn, Kathleen M.; Fujimoto, James G.; Bouma, Brett E.

doi:10.1016/s1359-835x(98)00084-0

Cited by 102 publications

(41 citation statements)

References 10 publications

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“…16,17 The intensity of the light reaching a particular depth for any position across the sample is affected by how strongly features directly above that position reflect or randomly scatter the light. 25 Our preliminary experiments found that the reflection could be reduced by covering the tooth surface with a thin layer of water (n = 1.33), which will decrease the refractive index contrast at the air-sample interface, minimizing the effects of strong surface reflections on calculations of R and improving the quality of OCT image. However, it is difficult to control the thickness of plain water layer, and the variable water thickness may distort the OCT images.…”

Section: Discussionmentioning

confidence: 96%

Estimation of lesion progress in artificial root caries by swept source optical coherence tomography in comparison to transverse microradiography

et al. 2011

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Abstract. This study aimed to investigate whether swept source optical coherence tomography (SS-OCT) could estimate the lesion depth and mineral loss quantitatively without the use of polarization sensitivity, and to examine a relationship between OCT data and transverse microradiography (TMR) lesion parameters. Twenty-four bovine root dentin specimens were allocated to three groups of 4-, 7-, and 14-day demineralization. Cross-sectional images of the specimens before and after the demineralization were captured by OCT at 1319 nm center wavelength. Following the demineralization, these specimens were cut into sections for TMR analysis. Correlations between the OCT data and TMR lesion parameters were examined. TMR images of the specimens showed cavitated lesions (lesion depth or LD TMR : 200 to 500 μm, Z or mineral loss: 10,000 to 30,000 vol % μm). The OCT images showed "boundaries," suggesting the lesion front. Integrated dB values before and after the demineralization and their difference (R D , R S , and R, respectively) were calculated from the lesion surface to the corrected depth of boundary (LD OCT ). A statistically significant correlation was found between LD OCT and LD TMR (p < 0.05, r = 0.68). Similarly, statistically significant correlations were found between Z and R D or R. The OCT showed a potential for quantitative estimation of lesion depth and mineral loss with cavitated dentin lesions in vitro. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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Section: Discussionmentioning

confidence: 96%

Estimation of lesion progress in artificial root caries by swept source optical coherence tomography in comparison to transverse microradiography

et al. 2011

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“…In cross-polarization-optical coherence tomography (CP-OCT), the output beam is linearly polarized and the system design isolates the returning perpendicular axis signal, thus reducing the overall specular reflection when imaging the high refractive index enamel 15 and enhancing image contrast between dental enamel and resin composite material. 13 OCT imaging of dental resin composites has been shown to be strongly influenced by the refractive index differences between the resin and the reinforcement material (filler) 16,17 ; however, the effect of nanoparticles within the resin matrix and the influence of colorants need to be further examined. This will be important in determining both the optimal resin composition and shade selection for diagnostic OCT imaging.…”

Section: Introductionmentioning

confidence: 99%

Influence of dental resin material composition on cross-polarization-optical coherence tomography imaging

Lammeier

Lunos

et al. 2012

J. Biomed. Opt

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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 ¼ 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.

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“…9 While OCT is ideally suited to imaging biological tissues, it is also appropriate for other translucent materials. Examples include imaging the fiber architecture of glass-reinforced polymer composites, 10 analyzing dentures, 11 and imaging ceramic glazes. 12 Negrutiu et al 11 used OCT to noninvasively examine dentures made with different molding techniques for defects.…”

Section: Introductionmentioning

confidence: 99%

Application of optical coherence tomography to automated contact lens metrology

Davidson

Barton

2010

J. Biomed. Opt.

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Abstract. Optical coherence tomography ͑OCT͒ is a nondestructive imaging modality with the potential to make quantitative spatial measurements. OCT's noncontact nature, sensitivity to small refractive index mismatches, and micron-scale resolution make it attractive for contact lens metrology, specifically, measuring prism. Prism is defined as the maximum difference in thickness of the contact lens, measured over a full 360 deg of rotation, at a fixed distance from the contact lens edge. We develop and test a novel algorithm that automatically analyzes OCT images and calculates prism. Images are obtained using a Thorlabs OCT930SR OCT system. The OCT probe is fastened to an automated rotation stage that rotates 360 deg in small increments ͑typically 10 deg͒ to acquire OCT images of the edge of the contact lens around the entire circumference. The images are 1.6 mm in optical depth ͑512 pixels͒ and 2 mm wide ͑1000 pixels͒. Several sets of images are successfully analyzed. The prism measured for a toric lens is 42 m, which is in line with design parameters. Thickness measurements are repeatable with a standard deviation of 0.5 m and maximum range of 1.8 m over ten image sets. This work demonstrates the possibility of using OCT to perform nondestructive contact lens metrology.

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Optical coherence tomography of glass reinforced polymer composites

Cited by 102 publications

References 10 publications

Estimation of lesion progress in artificial root caries by swept source optical coherence tomography in comparison to transverse microradiography

Estimation of lesion progress in artificial root caries by swept source optical coherence tomography in comparison to transverse microradiography

Influence of dental resin material composition on cross-polarization-optical coherence tomography imaging

Application of optical coherence tomography to automated contact lens metrology

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