1. Articles from michael hughes

    1-19 of 19
    1. Analysis of dental abfractions by optical coherence tomography

      Analysis of dental abfractions by optical coherence tomography
      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 ...
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    2. Speckle noise reduction in optical coherence tomography of paint layers

      We present and characterize a sequential angular compounding method for reducing speckle contrast in optical coherence tomography images of paint layers. The results are compared with postprocessing methods, and we show that the compounding technique can improve the speckle contrast ratio in B-scans by better than a factor of 2 in exchange for a negligible loss of resolution. As a result, image aesthetics are improved, thin layers become more distinct, and edge-detection algorithms work more efficiently. The effect of varying the angular scan size and number of averages is investigated, and it is found that a degree of statistical correlation ...
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    3. Marginal adaptation of ceramic veneers investigated with en face optical coherence tomography

      The aim of this study was to analyze the quality of marginal adaptation and gap width of Empress veneers using en-face optical coherence tomography. The results prove the necessity of investigating the marginal adaptation after each veneer bonding process
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    4. Optical coherence tomography combined with confocal microscopy for investigation of interfaces in class V cavities

      Standardized class V cavities, prepared in human extracted teeth, were filled with Premise (Kerr) composite. The specimens were thermo cycled. The interfaces were examined using a system employing two simultaneous imaging channels, an en-face Optical Coherence Tomography channel and a confocal microscopy channel.
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    5. Occlusal overload investigations by noninvasive technology: fluorescence microscopy and en-face optical coherence tomography

      The aim of this study is the early detection and monitoring of occlusal overload in bruxing patients. En-Face Optical coherence tomography (eF-OCT) and fluorescence microscopy (FM) were used for the imaging of several anterior teeth extracted from patients with light active bruxism. We found a characteristic pattern of enamel cracks, that reached the tooth surface. We concluded that the combination of the en-Face OCT and FM is a promising non-invasive alternative technique for reliable monitoring of occlusal overload.
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    6. En face optical coherence tomography investigation of apical microleakage after laser-assisted endodontic treatment

      The aim of our study was to evaluate the potential of en face optical coherence tomography (OCT) for the detection of apical microleakage after 980 nm and 1,064 nm laser-assisted endodontic treatment. Ninety, human, single-rooted teeth with one straight root canal and closed apices were used. All roots were prepared biomechanically to the working length at an apical size 30 and 0.06 taper. The teeth were divided into three equal groups of 30 samples each, according to the treatment to be applied to the root canal. Group I received 980 nm diode laser (3 W, 0.01 s ...
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    7. Optical coherence tomography and confocal microscopy investigations of dental structures and restoration materials

      Nowadays, optical tomographic techniques are of particular importance in the medical imaging field, because these techniques can provide non-invasive diagnostic images. The present study evaluates the potential of en-face optical coherence tomography (OCT) as a possible non-invasive high resolution imaging method in supplying the necessary information on the quality of dental hard tissues and defects of dental restorative materials. Teeth after several treatment methods are imaged in order to asses the material defects and micro-leakage of tooth-filling interface as well as to evaluate the quality of dental hard tissue. C-scan and B-scan OCT images as well as confocal images are ...
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    8. Effect of masticatory load on cracks deflection/penetration investigated with en-face optical coherence tomography in ceramic fixed partial dentures

      Optical Coherence Tomography (OCT) allows a better characterization of dental prostheses. The detection of substance defects within the ceramic layers for metal-ceramic prostheses was demonstrated. The detected defects have a large volume and therefore there is a high likelihood for fracture lines to be generated in the proximal areas of the ceramic fixed partial dentures. If the detection of such defects is feasible before inserting the prosthesis into the oral cavity, then timely corrective measures are possible in order to avoid the fracture of the ceramic component later on. After noninvasive localization of cracks in ceramic fixed partial dentures, the ...

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    9. Marginal adaptation analysis performed with en-face optical coherence tomography in fixed partial dentures

      Frameworks for fixed partial denture made out of dental alloys thought classic techniques currently involve many errors like marginal and internal gaps. The aim of this study is to present alternative technologies in making frameworks from dental alloys using selective laser sintering/ selective las ... [Proc. SPIE 7258, 72584H (2009)] published Fri Mar 13, 2009.

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    10. Optical Coherence Tomography in archaeological and conservation science - a new emerging field

      There has been a long tradition of applying biomedical imaging techniques to the examination of historical artefacts, owing to similar demands for non-invasive methods in both fields. Optical Coherence Tomography (OCT) is no exception. We review the achievements on OCT applications to art conservati ... [Proc. SPIE 7139, 713915 (2008)] published Tue Dec 30, 2008.
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    11. Quality assessment of dental treatments using en-face optical coherence tomography

      Quality assessment of dental treatments using en-face optical coherence tomography

      The present study evaluates the potential of en-face optical coherence tomography (OCT) as a possible noninvasive high resolution method for supplying necessary information on the material defects of dental prostheses and microleakage at prosthetic interfaces. Teeth are also imaged after several treatment methods to asses material defects and microleakage at the tooth-filling interface, and the presence or absence of apical microleakage, as well as to evaluate the quality of bracket bonding on dental hard tissue. C-scan and B-scan OCT images as well as confocal images are acquired from a large range of samples. Gaps between the dental interfaces and material ...

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    12. Quasi-simultaneous optical coherence tomography and confocal imaging

      Irina Trifanov, Michael Hughes, Adrian Gh. Podoleanu et al. A new approach of acquiring quasi-simultaneous optical coherence tomography (OCT) and confocal images is presented. The two images are generated using different principles, OCT and confocal microscopy. When the system is used to image the retina, the two images have depth resolutions, at present, of ... [J. Biomed. Opt. 13, 044015 (2008)] published Fri Jul 18, 2008.
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    13. Fibres reinforced dentures investigated with en-face optical coherence tomography

      Meda L. Negrutiu, Cosmin Sinescu, Michael Hughes et al. The complete dentures are currently made using different technologies. In order to avoid deficiencies of the prostheses made using the classical technique, several alternative procedures have been devised. In order to enhance the mechanical strength, complete denture bases are reinforced with fibres ... [Proc. SPIE Int. Soc. Opt. Eng. 6991, 69911U (2008)] published Fri May 2, 2008.
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    14. Root canal filling evaluation using optical coherence tomography

      Meda L. Negrutiu, Cosmin Sinescu, Michael Hughes et al. The root canal fillings are destined to seal the root canal especially in the apical areea. Invasive techniques are known which are used to assess the quality of the seal. These lead to the destruction of the probes and often no conclusion could be drawn in respect to the existence of any microleaka ... [Proc. SPIE Int. Soc. Opt. Eng. 6991, 69911T (2008)] published Fri May 2, 2008.
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    15. Investigation of bracket bonding for orthodontic treatments using en-face optical coherence tomography

      Cosmin Sinescu, Meda L. Negrutiu, Michael Hughes et al. Despite good diagnosis and treatment planning, orthodontic treatment can fail if bonding fails. It is now common practice to address the aesthetic appearance of patients using aesthetic brackets instead of metal ones. Therefore, bonding aesthetic brackets has become an issue for orthodontists today. ... [Proc. SPIE Int. Soc. Opt. Eng. 6991, 69911M (2008)] published Fri May 2, 2008.
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    16. Implant bone interface investigated with a non-invasive method: optical coherence tomography

      Cosmin Sinescu, Michael Hughes, Adrian Bradu et al. Bone implants insertion implies the necessity of a important primary stability. The quality of the implant insertion could be investigated by implant bone interface analysis. In this study, we demonstrate that en-face optical coherence tomography can be used to evaluate these interfaces. We have col ... [Proc. SPIE Int. Soc. Opt. Eng. 6991, 69911L (2008)] published Fri May 2, 2008.
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    17. Quasi-simultaneous OCT and confocal imaging

      Irina Trifanov, Michael Hughes, Richard B. Rosen et al. A new approach of acquiring quasi-simultaneous OCT and confocal images is presented. The two images are generated using different principles, optical coherence tomography (OCT) and confocal microscopy (CM). When the system is used to image the retina, the two images have depth resolutions, at presen ... [Proc. SPIE Int. Soc. Opt. Eng. 6991, 69911C (2008)] published Fri May 2, 2008.
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    18. An optical coherence tomography investigation of materials defects in ceramic fixed partial dental prostheses

      Cosmin Sinescu, Meda Negrutiu, Michael Hughes et al. Metal ceramic and integral ceramic fixed partial prostheses are mainly used in the frontal part of the dental arch because for esthetics reasons. The masticatory stress may induce fractures of the bridges. There are several factors that are associated with the stress state created in ceramic restora ... [Proc. SPIE Int. Soc. Opt. Eng. 6991, 69910O (2008)] published Fri May 2, 2008.
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    19. Optical coherence tomography for art conservation and archaeology

      Haida Liang, Borislava Peric, Michael Hughes et al. Optical coherence tomography (OCT) is a fast scanning Michelson interferometer originally designed for in vivo imaging of the eye. In 2004, our group along with two other groups first reported the application of OCT to art conservation and archaeology. Since that time we have been conducting a proje ... [Proc. SPIE Int. Soc. Opt. Eng. 6618, 661805 (2007)] published Mon Jul 16, 2007.
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    1-19 of 19
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  2. Topics in the News

    1. (19 articles) University of Kent
    2. (18 articles) Adrian G. Podoleanu
    3. (14 articles) Victor Babes University of Medicine and Pharmacy
    4. (14 articles) Cosmin Sinescu
    5. (13 articles) Adrian Bradu
    6. (6 articles) George M. Dobre
    7. (3 articles) Meda-Lavinia Negrutiu
    8. (2 articles) New York Eye and Ear Infirmary
    9. (2 articles) Haida Liang
    10. (2 articles) Richard B. Rosen
    11. (1 articles) Sungkyunkwan University
    12. (1 articles) Texas A&M University
    13. (1 articles) FDA
    14. (1 articles) University of Southern California
    15. (1 articles) Joon Mo Kim
    16. (1 articles) Brian E. Applegate
    17. (1 articles) Wihan Kim
    18. (1 articles) Javier A. Jo
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    Quality assessment of dental treatments using en-face optical coherence tomography Analysis of dental abfractions by optical coherence tomography Medical treatment of inflammatory punctual stenosis monitored by anterior segment optical coherence tomography Development and Validation of a Deep Learning System for Diagnosing Glaucoma Using Optical Coherence Tomography Methylene blue-filled biodegradable polymer particles as a contrast agent for optical coherence tomography Optical coherence tomography for thyroid pathology: 3D analysis of tissue microstructure Mathematical Analysis of Texture Indicators for the Segmentation of Optical Coherence Tomography Images Comparison of Current Optical Coherence Tomography Angiography Methods in Imaging Retinal Hemangioblastomas New findings useful for clinical practice using swept-source optical coherence tomography angiography in the follow-up of active ocular toxoplasmosis Ultrafast-laser ablation of polymer multicore fibers enhances biomedical sensing Optical Coherence Tomography Angiography Findings in Optic Nerve Sheath Meningioma Massachusetts General Hospital Receives NIH Grant for Less Invasive Assessment of Inflammation and Subepithelial Remodeling in Eosinophlic Esophagitis Patients