Changes in the optical properties of dental enamel at 1310 nm after demineralization

Huynh, Gigi D.; Darling, Cynthia L.; Fried, Daniel

doi:10.1117/12.539290

Cited by 19 publications

(21 citation statements)

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“…This finding is probably the result of the number of pores within the demineralized enamel remaining fairly constant at the higher mineral densities, creating a similar intensity of light scattering. 16,20 The increased HIS200 at the enamel with low mineral loss appears to agree with a previous report of excellent SS-OCT detectability of early enamel demineralization. 32 It is well evidenced that because of the formation of numerous micro porosity created by mineral loss, 14 the scattering coefficient of demineralized enamel shows a 2 -3 fold increase over that of sound enamel.…”

Section: Discussionsupporting

confidence: 79%

“…32 It is well evidenced that because of the formation of numerous micro porosity created by mineral loss, 14 the scattering coefficient of demineralized enamel shows a 2 -3 fold increase over that of sound enamel. 16 Although the size of the demineralized pores was not measured in this experiment, Darling et al 30 demonstrated that the pores in demineralized lesions highly scattered light suggesting Mielike scatters. Since Mie scattering is the phenomenon where the size of the scattering particles is comparable to the wavelength of the light, the size of the pores or demineralized enamel crystals appears roughly close to the SS-OCT wavelength 1310 nm or more.…”

Section: Discussionmentioning

confidence: 99%

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Optical analysis of enamel and dentin caries in relation to mineral density using swept-source optical coherence tomography

et al. 2016

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, "Optical analysis of enamel and dentin caries in relation to mineral density using swept-source optical coherence tomography," J. Med. Imag. 3(3), 035507 (2016), doi: 10.1117/1.JMI.3.3.035507.Optical analysis of enamel and dentin caries in relation to mineral density using swept-source optical coherence tomography Abstract. The aim of this study was to evaluate the signal intensity and signal attenuation of swept source optical coherence tomography (SS-OCT) for dental caries in relation to the variation of mineral density. SS-OCT observation was performed on the enamel and dentin artificial demineralization and on natural caries. The artificial caries model on enamel and dentin surfaces was created using Streptococcus mutans biofilms incubated in an oral biofilm reactor. The lesions were centrally cross sectioned and SS-OCT scans were obtained in two directions to construct a three-dimensional data set, from the lesion surface (sagittal scan) and parallel to the lesion surface (horizontal scan). The integrated signal up to 200 μm in depth (IS200) and the attenuation coefficient (μ) of the enamel and dentin lesions were calculated from the SS-OCT signal in horizontal scans at five locations of lesion depth. The values were compared with the mineral density obtained from transverse microradiography. Both enamel and dentin demineralization showed significantly higher IS200 and μ than the sound tooth substrate from the sagittal scan. Enamel demineralization showed significantly higher IS200 than sound enamel, even with low levels of demineralization. In demineralized dentin, the μ from the horizontal scan consistently trended downward compared to the sound dentin.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Optical analysis of enamel and dentin caries in relation to mineral density using swept-source optical coherence tomography

et al. 2016

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“…We are careful to point out that the strong correlation between lesion severity and depth is only intrinsic to the particular artifi cial caries model employed in this study [Arends et al, 1997]. Optical attenuation measurements in our laboratory show that the magnitude of the scattering coeffi cient at 1,310 nm increases by 2-3 orders of magnitude after demineralization providing high contrast [Huynh et al, 2004;Darling and Fried, 2005]; however, the degree of depolarization with scattering has yet to be established along with the precise relationship with volume percent mineral loss. Therefore, the linear correlation observed for the model employed in this study may not apply to other artifi cial caries models or natural occlusal caries, since the optical properties may differ between the lesion types.…”

Section: Discussionmentioning

confidence: 99%

“…PS-OCT images by Baumgartner et al [2000] resolved enamel demineralization through an increase in backscattered intensity and changes in the enamel birefringence. Later studies have demonstrated that there is a 2-3 order of magnitude increase in the scattering coeffi cient of dental enamel upon demineralization [Huynh et al, 2004]. If the incident-illuminating light is linearly polarized, the light scattered from the demineralized lesion area will rapidly depolarize [Everett et al, 1999].…”

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confidence: 99%

Imaging Artificial Caries on the Occlusal Surfaces with Polarization-Sensitive Optical Coherence Tomography

et al. 2006

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Polarization-sensitive optical coherence tomography (PS-OCT) is a nondestructive imaging system that can utilize near-infrared (IR) light to produce depth-resolved images of dental enamel and has the potential to monitor early enamel occlusal caries. The objective of this study was to investigate the relationship between the magnitude of backscattered light and depolarization recorded by PS-OCT with changes in the enamel mineral volume in an artificial caries model. Artificial lesions were created on a selected region on the occlusal surfaces of sound posterior teeth (n = 10) using a well-characterized 14-day pH cycling model. An all-fiber-based PS-OCT system operating at 1,310 nm was used to collect serial images at day 0 and day 14 prior to tooth sectioning. The quantitative mineral content profile and relative mineral loss, ΔZ (%vol × µm), of the carious enamel samples were obtained from transverse sections using high-resolution digital microradiography (DM). Line profiles of PS-OCT and DM images were used to evaluate the artificial caries severity and depth. The integrated reflectivity of the perpendicular-axis PS-OCT image, quantifying lesion severity, was correlated to the ΔZ of the caries lesions. There was also a strong correlation between the lesion depth calculated from both imaging modalities. PS-OCT can image and quantify artificial occlusal caries by measuring the increase in backscattering and depolarization of near-IR light. This optical method has promising applications for in vivo detection and monitoring of early enamel occlusal caries.

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“…3 Optical coherence tomography (OCT) is a nondestructive imaging technique using low-coherence interferometry to determine the time delay and magnitude of backscattered light reflected off a transparent and semitransparent structure. 9 By using the optical properties of reflection and scattering into sound and carious mineralized tissues, it is possible to evaluate and characterize morphological structures as the CEJ and DEJ. 10 The aim of this ex vivo study was to analyze the morphological properties of RRC using OCT, which has the advantage of being noninvasive and nondestructive -therefore having potential clinical use -and to further match such results with the PLM findings.…”

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confidence: 99%

Optical Coherence Tomography as an Auxiliary Tool for the Screening of Radiation-Related Caries

Mota

Gueiros

Maia

et al. 2013

Photomedicine and Laser Surgery

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Objective: The aim of this study was to evaluate the morphological alterations of radiation-related caries using optical coherence tomography. Methods: Thirty-six extracted teeth from 11 patients who had undergone radiotherapy were sectioned in the sagittal axis in the center of the carious lesion, and 100 lm thick sections were obtained from each specimen. One sample from each tooth was investigated by an optical coherence tomography (OCT) system, and the results were compared with histological images from polarized light microscopy. Results: In OCT dentin caries images, the demineralized area appeared as a white region, whereas the translucent zone appeared as a dark area, a similar pattern also seen in coronal caries. In noncavitated enamel lesions clinically observed as brown discoloration, the area of high porosity, and also the dark color, absorbs part of the light, resulting in a dark pattern. Finally, the involvement of dentin-enamel junction (DEJ) or cement-enamel junction (CEJ) could be clearly observed, when present and marked alterations along the CEJ could be noted, as junction continuity loss, gap formation, and mineral loss tissue. Conclusions: The OCT technique was able to characterize radiation-related caries, from a morphological point of view. Also demonstrated was its potential benefit for use in the clinical monitoring of radiation-related carious process.

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Changes in the optical properties of dental enamel at 1310 nm after demineralization

Cited by 19 publications

References 0 publications

Optical analysis of enamel and dentin caries in relation to mineral density using swept-source optical coherence tomography

Optical analysis of enamel and dentin caries in relation to mineral density using swept-source optical coherence tomography

Imaging Artificial Caries on the Occlusal Surfaces with Polarization-Sensitive Optical Coherence Tomography

Optical Coherence Tomography as an Auxiliary Tool for the Screening of Radiation-Related Caries

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