Transillumination and reflectance probes for<i>in vivo</i>near-IR imaging of dental caries

Simon, Jacob C.; Lucas, Seth A.; Staninec, Michal; Tom, Henry; Chan, Kenneth H.; Darling, Cynthia L.; Fried, Daniel

doi:10.1117/12.2045630

Cited by 18 publications

(22 citation statements)

References 15 publications

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“…Occlusal transillumination images utilized light from a tungsten halogen source and bifurcated fiber optic bundle equipped with two linear arrays to impart light angled apically at the cementoenamel junction from both sides of the tooth and collect transmitted signal through a band pass 1300-nm optical filter and lens system. Detailed schematics covering the geometry of each modality and theory of the resulting image contrast can be found in previous publications [28]. NIR images were analyzed using the image analysis package provided by IgorPRO software (Wavemetrics, Lake Oswego, OR).…”

Section: Methodsmentioning

confidence: 99%

“…When sound enamel becomes demineralized by caries, pores within the lesion grow to a similar size of the wavelength of light and act as Mie scatters increasing the scattering coefficient 2–3 orders of magnitude [27]. Differences in light scattering between sound and demineralized enamel can be detected by imaging light transmitted through or reflected back from the tooth [28]. Imaging with longer wavelength (λ≥1300-nm) NIR light also avoids the absorption bands of organic molecules responsible for pigmentation allowing direct imaging of decay beneath stained surfaces such as the occlusal grooves [29].…”

Section: Introductionmentioning

confidence: 99%

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Near-infrared imaging of secondary caries lesions around composite restorations at wavelengths from 1300–1700-nm

et al. 2016

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Background and Objectives Current clinical methods for diagnosing secondary caries are unreliable for identifying the early stages of decay around restorative materials. The objective of this study was to access the integrity of restoration margins in natural teeth using near-infrared (NIR) reflectance and transillumination images at wavelengths between 1300–1700-nm and to determine the optimal NIR wavelengths for discriminating composite materials from dental hard tissues. Materials and Methods Twelve composite margins (n=12) consisting of class I, II & V restorations were chosen from ten extracted teeth. The samples were imaged in vitro using NIR transillumination and reflectance, polarization sensitive optical coherence tomography (PS-OCT) and a high-magnification digital microscope. Samples were serially sectioned into 200–μm slices for histological analysis using polarized light microscopy (PLM) and transverse microradiography (TMR). Two independent examiners evaluated the presence of demineralization at the sample margin using visible detection with 10× magnification and NIR images presented digitally. Composite restorations were placed in sixteen sound teeth (n=16) and imaged at multiple NIR wavelengths ranging from λ=1300–1700-nm using NIR transillumination. The image contrast was calculated between the composite and sound tooth structure. Results Intensity changes in NIR images at wavelengths ranging from 1300–1700-nm correlate with increased mineral loss measured using TMR. NIR reflectance and transillumination at wavelengths coincident with increased water absorption yielded significantly higher (P<0.001) contrast between sound enamel and adjacent demineralized enamel. In addition, NIR reflectance exhibited significantly higher (P<0.01) contrast between sound enamel and adjacent composite restorations than visible reflectance. Significance This study shows that NIR imaging is well suited for the rapid screening of secondary caries lesions.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Near-infrared imaging of secondary caries lesions around composite restorations at wavelengths from 1300–1700-nm

et al. 2016

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Section: Methodsmentioning

confidence: 99%

In-vitronear-infrared imaging of natural secondary caries

et al. 2015

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Secondary caries stands as the leading reason for the failure of composite restorations and dentists spend more time replacing existing restorations than placing new ones. Current clinical strategies, and even modern visible light methods designed to detect decay, lack the sensitivity to distinguish incipient lesions, are confounded by staining on the surface and within the tooth, or are limited to detecting decay on the tooth surface. Near-IR (NIR) imaging methods, such as NIR reflectance and transillumination imaging, and optical coherence tomography are promising strategies for imaging secondary caries. Wavelengths longer than 1300-nm avoid interference from stain and exploit the greater transparency of sound enamel and dental composites, to provide increased contrast with demineralized tissues and improved imaging depth. The purpose of this study was to determine whether NIR transillumination (λ=1300-nm) and NIR cross-polarized reflectance (λ=1500–1700-nm) images can serve as reliable indicators of demineralization surrounding composite restorations. Twelve composite margins (n=12) consisting of class I, II & V restorations were chosen from ten extracted teeth. The samples were imaged in vitro using NIR transillumination and reflectance, polarization sensitive optical coherence tomography (PS-OCT) and a high-magnification digital visible light microscope. Samples were serially sectioned into 200–μm slices for histological analysis using polarized light microscopy (PLM) and transverse microradiography (TMR). The results presented demonstrate the utility of NIR light for detecting recurrent decay and suggest that NIR images could be a reliable screening tool used in conjunction with PS-OCT for the detection and diagnosis of secondary caries.

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“…In addition, near-infrared (NIR) imaging is currently being a new technology for trans-illumination and reflectance imaging of dental caries due to the high transparency of the enamel in the NIR light. 11 12 Usenik et al 13 showed that a near-infrared hyperspectral imaging system could distinguish the demineralization lesions from sound enamel within 156 seconds by imaging water evaporation dynamics.…”

Section: Introductionmentioning

confidence: 98%

Simultaneous Measurement of Multiple Scattering Coefficient and Scattering Anisotropy Factor in Dental Demineralization

Kao¹,

Kung²,

Lin³

et al. 2015

j med imaging hlth inform

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We developed an intraoral swept source optical coherence tomography (SSOCT) and combined a simultaneous measurement of optical quantitative parameters (i.e., multiple scattering coefficient, m , and scattering anisotropy factor, g eff ) for nondestructive assessment of dental hard tissues. Two-dimensional (2D) circumferential images were constructed by rotating the mini-probe (1.8 mm in diameter) while acquiring image lines, and the adjacent lines in each rotation could be stacked to generate a three-dimensional (3D) volume. In OCT images, areas of demineralization show statistically significant differences (p < 0 01) in optical parameters compared with the parameters from sound enamel.

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Transillumination and reflectance probes forin vivonear-IR imaging of dental caries

Cited by 18 publications

References 15 publications

Near-infrared imaging of secondary caries lesions around composite restorations at wavelengths from 1300–1700-nm

Near-infrared imaging of secondary caries lesions around composite restorations at wavelengths from 1300–1700-nm

In-vitronear-infrared imaging of natural secondary caries

Simultaneous Measurement of Multiple Scattering Coefficient and Scattering Anisotropy Factor in Dental Demineralization

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