1. Virgil-Florin Duma

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    1. Mentioned In 35 Articles

    2. Effects of Temperature Variations during Sintering of Metal Ceramic Tooth Prostheses Investigated Non-Destructively with Optical Coherence Tomography

      Effects of Temperature Variations during Sintering of Metal Ceramic Tooth Prostheses Investigated Non-Destructively with Optical Coherence Tomography
      Calibration loss of ovens used in sintering metal ceramic prostheses leads to stress and cracks in the material of the prostheses fabricated, and ultimately to failure of the dental treatment. Periodic calibration may not be sufficient to prevent such consequences. Evaluation methods based on firing supplemental control samples are subjective, time-consuming, and rely entirely on the technicians skills. The aim of this study was to propose an alternative procedure for ...
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    3. Analysis of polygonal scanning heads: from industrial to high-end applications in swept sources for OCT

      Analysis of polygonal scanning heads: from industrial to high-end applications in swept sources for OCT
      An analysis of polygonal mirror (PM) scanning heads has been performed, in order to provide a tool for their optimal design. The theory developed brings under the same umbrella applications that range from industrial dimensional measurements to high-end biomedical imaging, for example for broadband laser sources swept in frequency for Swept Source Optical Coherence Tomography (SS-OCT). The different characteristic parameters of the PM scanning heads were considered in order to ...
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    4. 7th International Conference on Lasers in Medicine: Advanced Laser Technologies in the Hands of Medicine July 2017 Timisoara, Romania

      7th International Conference on Lasers in Medicine: Advanced Laser Technologies in the Hands of Medicine July 2017 Timisoara, Romania
      7th international conference on lasers in medicine in connection with international congress of lasers in dentistry. Advanced laser technologies in the hands of medicine. July 13015 Timisoara, Romania. For more information click here .
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    5. Geometric & radiometric vignetting associated with a 72-facet, off-axis, polygon mirror for swept source optical coherence tomography (SS-OCT)

      Geometric & radiometric vignetting associated with a 72-facet, off-axis, polygon mirror for swept source optical coherence tomography (SS-OCT)
      Optical Coherence Tomography (OCT) has a broad range of applications in 2D and volumetric imaging of micron scale structures typically used on inaccessible objects such as the retina of the eye. This report focuses on Swept Source OCT (SS-OCT), favoured for its faster scanning speeds and therefore faster data acquisition (highly favourable when imaging live patients). SS-OCT relies on the scanning of a narrow laser line at speeds typically in ...
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    6. Galvanometer Laser Scanning: Custom-Made Input Signals for Maximum Duty Cycles in High-End Imaging Applications

      Galvanometer Laser Scanning: Custom-Made Input Signals for Maximum Duty Cycles in High-End Imaging Applications
      The paper presents some of the contributions achieved in the study of galvanometer-based scanners (GSs) utilized for high-end applications. The optomechatronic aspects of this most used type of laser scanners are presented, in relationship with the high requirements of biomedical imaging, for example. The use of GSs with common input signals, such as triangular, sawtooth, and sinusoidal for domains like Optical Coherence Tomography (OCT) for example are discussedas studied in ...
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    7. MEMS-based handheld scanning probe with pre-shaped input signals for distortion-free images in Gabor-domain optical coherence microscopy

      MEMS-based handheld scanning probe with pre-shaped input signals for distortion-free images in Gabor-domain optical coherence microscopy
      High-speed scanning in optical coherence tomography (OCT) often comes with either compromises in image quality, the requirement for post-processing of the acquired images, or both. We report on distortion-free OCT volumetric imaging with a dual-axis micro-electro-mechanical system (MEMS)-based handheld imaging probe. In the context of an imaging probe with optics located between the 2D MEMS and the sample, we report in this paper on how pre-shaped open-loop input signals ...
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    8. Assessment of dental plaque by optoelectronic methods

      Assessment of dental plaque by optoelectronic methods
      The formation of dental biofilm follows specific mechanisms of initial colonization on the surface, microcolony formation, development of organized three dimensional community structures, and detachment from the surface. The structure of the plaque biofilm might restrict the penetration of antimicrobial agents, while bacteria on a surface grow slowly and display a novel phenotype; the consequence of the latter is a reduced sensitivity to inhibitors. The aim of this study was ...
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    9. OCT and shear-force evaluations of zirconia Fixed Partial Prosthesis processed with a conventional CAD/CAM technology

      OCT and shear-force evaluations of zirconia Fixed Partial Prosthesis processed with a conventional CAD/CAM technology
      Introduction. Dental ceramics show better biocompatibility and aesthetic properties in dental constructs with regard to metals. However, they also have an insufficient mechanical stability, as well as low resistance limits due to their fragility. Taking into account these aspects, glass infiltrated with ceramic materials such as alumina (i.e., zirconiareinforced ceramics) is being nowadays considered a better material for full fixed partial prostheses (FPPs) than ceramics: the former has a ...
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    10. OCT evaluation of single ceramic crowns: comparison between conventional and chair-side CAD/CAM technologies

      OCT evaluation of single ceramic crowns: comparison between conventional and chair-side CAD/CAM technologies
      Digital impressions were introduced to overcome some of the obstacles due to traditional impression materials and techniques. The aim of this in vitro study is to compare the accuracy of all ceramic crowns obtained with digital impression and CAD-CAM technology with the accuracy of those obtained with conventional impression techniques. Two groups of 10 crowns each have been considered. The digital data obtained from Group 1 have been processed and ...
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    11. Handheld scanning probes for optical coherence tomography: developments, applications, and perspectives

      Handheld scanning probes for optical coherence tomography: developments, applications, and perspectives
      We present the handheld scanning probes that we have recently developed in our current project for biomedical imaging in general and for Optical Coherence Tomography (OCT) in particular. OCT is an established, but dynamic imagistic technique based on laser interferometry, which offers micrometer resolutions and millimeters penetration depths. With regard to existing devices, the newly developed handheld probes are simple, light and relatively low cost. Their design is described in ...
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    12. Noninvasive Quantitative Evaluation of the Dentin Layer during Dental Procedures Using Optical Coherence Tomography

      Noninvasive Quantitative Evaluation of the Dentin Layer during Dental Procedures Using Optical Coherence Tomography
      A routine cavity preparation of a tooth may lead to opening the pulp chamber. The present study evaluates quantitatively, in real time, for the first time to the best of our knowledge, the drilled cavities during dental procedures. An established noninvasive imaging technique, Optical Coherence Tomography (OCT), is used. The main scope is to prevent accidental openings of the dental pulp chamber. Six teeth with dental cavities have been used ...
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    13. 1-15 of 35 1 2 3 »
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  2. About Virgil-Florin Duma

    Virgil-Florin Duma

    Virgil-Florin Duma is Professor of Engineering at the Aurel Vlaicu University of Arad (UAVA) Romania, where he founded and leads the 3OM Optomechatronics Group. He received his PhD cum laude in Fine Mechanics & Optics in 2001, from the Polytechnics University of Timisoara (UPT), Romania, where he graduated in 1991, summa cum laude. In 1991-2001 he worked at UPT; in 1999-2001 he had joint appointments at UPT and at UAVA. In 2001 he became Associate Professor and in 2006 Professor at UAVA. He is author of over 170 publications in journals and conferences, 15 books & book chapters, and has 3 patents requests. He was a Fulbright Senior Research Fellow at The Institute of Optics, University of Rochester, NY, USA (2009-2010), where he holds a Visiting Scientist position, is since 2009 a Visiting Senior Research Fellow at the University of Kent, Canterbury, UK, and since 2014 an Adjunct Professor at the School of Physics, West University of Timisoara, Romania and at UPT (at the latter, as PhD supervisor). Prof. Duma is since 2009 Vice-president of EUROP RO (Romanian branch of EUropean RObotics Platform) and since 2013 President of the Arad branch of the Romanian Robotics Society. He has participated in 16 research projects (in 5 of them as PI) and is currently PI of a Partnership Grant of the Romanian National Authority for Scientific Research ( http://3om-group-optomechatronics.ro/ ). His research interests are in Measuring Systems, Optomechatronics, and Biomedical Imaging. He is a member of OSA and IFToMM, and a Senior Member of SPIE.