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Organizations in the News
(17 articles) Victor Babes University of Medicine and Pharmacy
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People in the News
(16 articles) Cynthia L. Darling
(16 articles) Adrian G. Podoleanu
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Morphological characterization of dental prostheses interfaces using optical coherence tomography
Explore Article SPIE Digital Library (Mar 9 2010) Dentistry
Fixed partial prostheses as integral ceramic, polymers, metal-ceramic or metal-polymers bridges are mainly used in the frontal part of the dental arch (especially the integral bridges). They have to satisfy high stress as well as esthetic requirements. The masticatory stress may induce fractures of the bridges. These may be triggered by initial materials defects or by alterations of the technological process. The fractures of these bridges lead to functional, esthetic and phonetic disturbances which finally render the prosthetic treatment inefficient. Dental interfaces represent one of the most significant aspects in the strength of the dental prostheses under the masticatory load. ...
Comment on Article Mentions: Adrian Bradu Cosmin Sinescu Adrian G. Podoleanu
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Adhesive improvement in optical coherence tomography combined with confocal microscopy for class V cavities investigations
Explore Article SPIE Digital Library (Mar 9 2010) Dentistry
The purpose of this study is to present a non invasive method for the marginal adaptation evaluation in class V composite restorations. Standardized class V cavities prepared in human extracted teeth were filled with composite resin (Premise, Kerr). The specimens were thermocycled. The interfaces were examined by Optical Coherence Tomography (OCT) combined with confocal microscopy and fluorescence. The optical configuration uses two single mode directional couplers with a superluminiscent diode as the source at 1300 nm. The scanning procedure is similar to that used in any confocal microscope, where the fast scanning is en-face (line rate) and the depth scanning ...
Comment on Article Mentions: Cosmin Sinescu George M. Dobre Adrian G. Podoleanu
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Imaging natural occlusal caries lesions with optical coherence tomography
Explore Article SPIE Digital Library (Mar 5 2010) Dentistry
Several studies have demonstrated that polarization-sensitive optical coherence tomography (PS-OCT) can be used to nondestructively measure the severity of demineralization in the important occlusal surfaces. The purpose of this study was to assess the potential of PS-OCT and OCT methods for the measurement of the depth of natural occlusal carious lesions. Teeth were screened for potential occlusal lesions using near infrared imaging (NIR). A PS-OCT system operating at 1310-nm was used to acquire polarization resolved images of the area of interest on the occlusal surface. The teeth were serial sectioned to 200 µm thickness and examined with polarized light microscopy ...
Comment on Article Mentions: Daniel S. Fried Cynthia L. Darling UCSF
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Imaging early demineralization with PS-OCT
Explore Article SPIE Digital Library (Mar 5 2010) Dentistry
New methods are needed for the nondestructive measurement of tooth demineralization and remineralization to monitor the progression of incipient caries lesions (tooth decay) for effective nonsurgical intervention and to evaluate the performance of anti-caries treatments such as chemical treatments or laser irradiation. Studies have shown that optical coherence tomography (OCT) has great potential to fulfill this role since it can be used to measure the depth and severity of early lesions with an axial resolution exceeding 10-µm, it is easy to apply in vivo and it can be used to image the convoluted topography of tooth occlusal surfaces. In this ...
Comment on Article Mentions: Daniel S. Fried Cynthia L. Darling UCSF
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Imaging simulated secondary caries lesions with cross polarization OCT
Explore Article SPIE Digital Library (Mar 5 2010) Dentistry
The clinical diagnosis of secondary caries has been found to account for the replacement of the majority of intra-coronal restorations. Current methods to diagnose the presence of these lesions at early stages are considered insufficient due to their low sensitivity. Polarization-sensitive optical coherence tomography (PS-OCT) imaging studies have confirmed its effectiveness for imaging carious subsurface lesions in enamel and dentin. The objective of this study was to determine if PS-OCT can be used to nondestructively image demineralization through resin restorations on extracted teeth with both simulated and natural lesions. Simulated secondary caries lesions were created by exposing cavity preparations made ...
Comment on Article Mentions: Daniel S. Fried UCSF
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Near-IR polarization imaging of sound and carious dental enamel
Explore Article SPIE Digital Library (Mar 4 2010) Dentistry
A thorough understanding of how polarized near-IR light propagates through sound and carious dental hard tissues is important for the development of dental optical imaging systems. New optical imaging tools for the detection and assessment of dental caries (dental decay) such as near-IR imaging and optical coherence tomography can exploit the enhanced contrast provided by polarization sensitivity. In this investigation, an automated system was developed to collect images for the full 16-element Mueller Matrix. The polarized light was controlled by linear polarizers and liquid crystal retarders and the 36 images were acquired as the polarized near-IR light propagates through the ...
Comment on Article Mentions: Daniel S. Fried Cynthia L. Darling UCSF
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Analysis of dental abfractions by optical coherence tomography
Explore Article SPIE Digital Library (Mar 4 2010) Dentistry
im and objectives. Abfraction is the pathological loss of cervical hard tooth substance caused by biomechanical overload. High horizontal occlusal forces result in large stress concentrations in the cervical region of the teeth. These stresses may be high enough to cause microfractures in the dental hard tissues, eventually resulting in the loss of cervical enamel and dentin. The present study proposes the microstructural characterization of these cervical lesions by en face optical coherence tomography (eFOCT). Material and methods: 31 extracted bicuspids were investigated using eFOCT. 24 teeth derived from patients with active bruxism and occlusal interferences; they presented deep buccal ...
Comment on Article Mentions: Adrian G. Podoleanu Adrian Bradu State University of New York at Buffalo
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OCT monitoring of diffusion of water and glycerol through tooth dentine in different geometry of wetting
Explore Article SPIE Digital Library (Feb 25 2010) Dentistry
In our previous work optical coherence tomography (OCT) has been proved to be a useful tool for monitoring of diffusion of chemical agents (water, glycerol) within human tooth dentine. Such diffusion studies are interesting for tooth therapy (diffusion of medicinal preparations) and cosmetics (chemical whitening agents). Here we compare different wetting schemes in which the sample is either merged in the liquid agent so that the probe beam is to pass through a layer of liquid, or subjected to wetting through a special window from the back side. In spite of certain difference revealed, the order of magnitude of the ...
Comment on Article Mentions: Valery V. Tuchin Saratov State University
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Highly nonlinear photonic crystal fiber with high refractive index core for dental OCT applications
Explore Article SPIE Digital Library (Feb 23 2010) Dentistry , Broadband Sources
Optical coherence tomography is a technology which supplies the tomographic image using the optical interference. It uses the 1.31 µm wavelength for dental applications. Resolution problems of such a technology can be improved by using supercontinuum light sources as low coherent broadband light is achievable from optical supercontinuum. Photonic crystal fibers have the ability to generate the supercontinuum light even with moderate input power levels. Only thing to consider is to ensure zero or nearly zero dispersion of such fibers at the target 1.31µm wavelength. This paper presents design of a high nonlinear photonic crystal fiber with near-zero dispersion around ...
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An Update on Novel Non-Invasive Approaches for Periodontal Diagnosis
Explore Article Journal of Periodontology Online (Feb 16 2010) Dentistry
For decades there has been an ongoing search for clinically acceptable methods for the accurate, non-invasive diagnosis and prognosis of periodontitis. There are several well-known inherent drawbacks with current clinical procedures. The purpose of this review is to summarize some of the newly emerging diagnostic approaches, namely, infrared spectroscopy, optical coherence tomography (OCT), and ultrasound. The history and attractive features of these new approaches are briefly illustrated, and the interesting and significant inventions related to dental applications are discussed. The particularly attractive aspects for the dental community are that some of these methods are totally non-invasive, do not impose any ...
Comment on Article Mentions: Michael G. Sowa Mark D. Hewko National Research Council Canada
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Automated analysis of lesion depth and integrated reflectivity in PS-OCT scans of tooth demineralization
Explore Article www3.interscience.wiley.com (Jan 16 2010) Dentistry
Background and Objectives Several studies have demonstrated that polarization sensitive optical coherence tomography (PS-OCT) can be used to nondestructively measure the severity of subsurface demineralization in enamel and dentin, track lesion progression over time and measure remineralization. The purpose of this study was to develop methods for the automated assessment of the depth and severity of demineralization in PS-OCT scans. Materials and Methods Subsurface caries-like lesions of increasing depth and severity were produced in adjoining windows on 10 bovine enamel samples via exposure to demineralization for periods of 1-4 days. PS-OCT scans were acquired for each sample and analyzed using ...Comment on Article Mentions: Cynthia L. Darling Daniel S. Fried Michael H. Le
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Determination of ablation threshold for composite resins and amalgam irradiated with femtosecond laser pulses
Explore Article www3.interscience.wiley.com (Jan 12 2010) Dentistry
The use of laser for caries removal and cavity preparation is already a reality in the dental clinic. The objective of the present study was to consider the viability of ultrashort laser pulses for restorative material selective removal, by determining the ablation threshold fluence for composite resins and amalgam irradiated with femtosecond laser pulses. Lasers pulses centered at 830 nm with 50 fs of duration and 1 kHz of repetition rate, with energies in the range of 300 to 770 J were used to irradiate the samples. The samples were irradiated using two different geometrical methods for ablation threshold fluence ... -
Availability of Optical Coherence Tomography
Explore Article jada.ada.org (Jan 4 2010) Dentistry
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Caries detection in the 21st century -- sharpening our diagnostic abilities
Explore Article dentistryiq.com (Dec 11 2009) Dentistry
“A sharp explorer should be used with some pressure and if a very slight pull is required to remove it, the pit should be marked for restoration even if there are no signs of decay.” This is a quote from G.V. Black in 1924.1 Caries is not as simple to diagnose today as it was decades ago when there were large, bombed out teeth. With the increased use of fluoride, the detection of caries is not as simple as it used to be. Yet in 2009 many of us are still diagnosing caries the same way as G.V. Black did ...
Comment on Article Mentions: Lantis Laser
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Clinical diagnosis of oral submucous fibrosis with optical coherence tomography
Explore Article SPIE Digital Library (Nov 25 2009) Dentistry , Probes
A swept-source optical coherence tomography (SS-OCT) system with a specially designed probe is built for clinical scanning of oral submucous fibrosis (OSF) patients. By analysing 44 OSF cases of SS-OCT scanning results, two indicators, including epithelium (EP) thickness and standard deviation (SD) of A-mode scan intensity in the laminar propria (LP) layer, are found useful for real-time OSF diagnosis. Statistics show that sensitivity and specificity of LP SD can reach 84.1 and 95.5 %, respectively. Also, both sensitivity and specificity of EP thickness can reach 100 %.Comment on Article Mentions: Chih-Chung Yang National Taiwan University
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Great video Jim!
dariemihaela » Gary S. Mintz
Dear Prof. Dr. Gary S. Mintz, You are an extraordinary expert in imaging, an intelligence ...
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