High contrast reflectance imaging of simulated lesions on tooth occlusal surfaces at near‐IR wavelengths

Fried, William; Fried, Daniel; Chan, Kenneth H.; Darling, Cynthia L.

doi:10.1002/lsm.22159

Cited by 59 publications

(51 citation statements)

References 33 publications

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“…As a result analysis of images has been based on the increased signal intensity values to quantify parameters such as depth and mineral loss. Unlike the other optical techniques OCT produced images of the microstructure of tooth tissues assessed from the outer surface towers the pulp [17][18][19].…”

Section: Polarization -Sensitive Optical Coherence Tomography (Oct)mentioning

confidence: 99%

Contemporary Advanced Methods for Early Caries Detection and Diagnosis

2017

IJSR

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Nowadays it is apparent that the conventional methods for early caries detection do not fulfill the criteria for the ideal clinical methods (and also to be used in scientific studies). In this regard they are subjective and insensitive. In this point it is of paramount importance to develop novel detecting techniques, which will be promising quantitative detecting methods of early caries lesions. In this assumption there are new technologies and devices for detection and diagnosis of dental lesions at their early stages of formation, evaluating their activity with higher sensitivity and specificity. Some of these devices are developed and commercially available, others are still under development. Consequently, there some creative contemporary methods and devices with great theoretical impact and exceptional practical preferences as diagnostic techniques and methods are presented: i/ the technique of optical coherence tomography (OCT), ii/ polarized Raman spectroscopy (PRS).

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Section: Polarization -Sensitive Optical Coherence Tomography (Oct)mentioning

confidence: 99%

Contemporary Advanced Methods for Early Caries Detection and Diagnosis

2017

IJSR

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“…Hyperspectral reflectance measurements by Zakian et al show that the tooth appears darker with increasing wavelength. 7 Recent studies by Chung et al 15 and Fried et al 20 on natural and simulated occlusal lesions indicated that other NIR wavelengths coincident with higher water absorption provide significantly higher contrast than at 1300 nm or at visible wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Near-infrared imaging of demineralization under sealants

et al. 2014

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Abstract. Previous studies have shown that near-infrared (NIR) reflectance and transillumination imaging can be used to acquire high contrast images of early caries lesions and composite restorative materials. The aim of the study was to determine the optimum NIR wavelengths for imaging demineralized areas under dental sealants. Fifteen natural human premolars and molars with occlusal lesions were used in this in vitro study. Images before and after application of sealants were acquired using NIR reflectance and NIR transillumination at wavelengths of 1300, 1460, and 1500 to 1700 nm. Images were also acquired using polarization sensitive optical coherence tomography (OCT) for comparison. The highest contrast for NIR reflectance was at 1460 nm and 1500 to 1700 nm. These NIR wavelengths are coincident with higher water absorption. The clear Delton sealant investigated was not visible in either copolarization or cross-polarization OCT images. The wavelength region between 1500 and 1700 nm yielded the highest contrast of lesions under sealants for NIR reflectance measurements.

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“…Studies have shown that near-IR reflectance imaging beyond 1200-nm is well-suited for imaging carious lesions without the interference of stains [1, 2]. Conventional visible reflectance and quantitative light fluorescence techniques for carious lesion detection yield low lesion contrast and are plagued with poor sensitivity due to stains masking demineralization [3, 4].…”

Section: Introductionmentioning

confidence: 99%

Selective ablation of carious lesions using an integrated multispectral near-IR imaging system and a novel 9.3-µm CO2 laser

Chan

Fried

2018

Lasers in Dentistry XXIV

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Previous studies have shown that reflectance imaging at wavelengths greater than 1200-nm can be used to image demineralization on tooth occlusal surfaces with high contrast and without the interference of stains. In addition, these near-IR imaging systems can be integrated with laser ablation systems for the selective removal of carious lesions. Higher wavelengths, such as 1950-nm, yield higher lesion contrast due to higher water absorption and lower scattering. In this study, a point-to-point scanning system employing diode and fiber lasers operating at 1450, 1860, 1880, and 1950-nm was used to acquire reflected light images of the tooth surface. Artificial lesions were imaged at these wavelengths to determine the highest lesion contrast. Near-IR images at 1880-nm were used to demarcate lesion areas for subsequent selective carious lesion removal using a new compact air-cooled CO2 laser prototype operating at 9.3-µm. The highest lesion contrast was at 1950-nm and the dual NIR/CO2 laser system selectively removed the simulated lesions with a mean loss of only 12-µm of sound enamel.

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High contrast reflectance imaging of simulated lesions on tooth occlusal surfaces at near‐IR wavelengths

Cited by 59 publications

References 33 publications

Contemporary Advanced Methods for Early Caries Detection and Diagnosis

Contemporary Advanced Methods for Early Caries Detection and Diagnosis

Near-infrared imaging of demineralization under sealants

Selective ablation of carious lesions using an integrated multispectral near-IR imaging system and a novel 9.3-µm CO2 laser

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