Dentistry -Optical Coherence Tomography News

Articles in category: Dentistry

1-24 of 485 1 2 3 4 ... 19 20 21 »
1. Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns
  
  Explore MDPI Open Access Journals Platform Mar 21 2019 Dentistry
  
  Dental prostheses are sintered in ovens that sometimes suffer from a loss of calibration. This can lead to variations of the sintering temperature outside the range recommended by the manufacturer. Stress and even fractures in dental ceramics may occur, and this leads to the necessity to rebuild the dental construct. The aim of this work is to monitor the quality of sintering processes using an established biomedical imaging technique—optical coherence tomography (OCT). Conventional current procedures imply the fabrication of supplemental samples that add to the expenses and are only evaluated visually. To our knowledge, we were the first to ...
  Read Full Article
  
  Comment
  
  Mentions: Adrian G. Podoleanu University of Kent Cosmin Sinescu
2. Fried Illuminates the Future of Dentistry
  
  Explore NIH Record Newsletter Feb 25 2019 Dentistry
  
  For anyone who dreads going to the dentist, there may be light at the end of the tunnel. Advances in laser and light-based imaging technologies may soon change the face of modern dentistry. Dr. Daniel Fried Tooth enamel is almost transparent at longer wavelengths, making it possible to shine near-infrared light on a tooth to detect dental decay. “You can see right into the tooth,” said Dr. Daniel Fried, professor, University of California, San Francisco School of Dentistry. “The enamel looks almost like an ice cube.” Light-based imaging is minimally invasive, providing a safer alternative to an X-ray’s ionizing ...
  Read Full Article
  
  Comment
  
  Mentions: Daniel S. Fried UCSF
3. Remineralizing Potential of Nano-Silver-Fluoride for Tooth Enamel: An Optical Coherence Tomography Analysis
  
  Explore Sistema Eletrônico de Revistas Feb 21 2019 Dentistry
  
  Objective: To evaluate the use of nanosilver fluoride in the enamel remineralization process through optical coherence tomography . Material and Methods: All samples were submitted to demineralization process by pH cycling during 14 days and randomly distributed into three groups (n = 11): Nanosilver Fluoride (NSF), Sodium fluoride (NaF), and negative control. Optical coherence tomography images were acquired at three different moments: initial stage (T0), post caries formation (T1), and post pH cycling (T2). The integrity of the enamel surface and the measurement of the volume loss for the tissue after pH cycling in comparison to initial images were obtained from optical ...
  Read Full Article
  
  Comment
  
  Mentions: Anderson S. L. Gomes Federal University of Pernambuco Cláudia Cristina Brainer Oliveira Mota
4. Three-dimensional assessment of proximal contact enamel using optical coherence tomography
  
  Explore ScienceDirect Feb 19 2019 Dentistry
  
  Objective The purpose of this study was to detect and investigate the association of enamel microcracks with demineralization at proximal contact areas of premolars, using 3D swept-source optical coherence tomography (SS-OCT). Methods Extracted maxillary and mandibular premolars (n = 50 each), without any visible tooth cracks, were examined for demineralization of interproximal contact areas, using the International Caries Detection and Assessment System (ICDAS). SS-OCT was used to evaluate demineralization and detect microcracks. Demineralization progression was divided into 4 types by depth: 0 for sound enamel and Type I, II, and III for enamel demineralization penetrating into the outer third, the middle ...
  Read Full Article
  
  Comment
  
  Mentions: University of Washington Yasunori Sumi Tokyo Medical & Dental University
5. Detection of enamel subsurface lesions by swept-source optical coherence tomography
  
  Explore jstage.jst.go.jp Feb 5 2019 Dentistry
  
  This study aimed to non-destructively analyze the progression of subsurface enamel caries using swept-source optical coherence tomography (SS-OCT), a recently developed imaging analysis modality. Artificial enamel caries at various stages of demineralization were created in bovine tooth enamel using a modified lactic acid gel system. Untreated enamel served as a control. OCT images from cross-sections of enamel were collected. Mineral density, distribution, and histological changes were analyzed using an electron probe microanalyzer, scanning electron microscopy, and contact microradiography. The Raman spectrum and X-ray structural analysis of the enamel surfaces were determined. SS-OCT detected significant differences in mineral loss among the ...
  Read Full Article
  
  Comment
  
  Mentions: Tohoku University
6. Evaluation of calculus imaging on root surfaces by spectral-domain optical coherence tomography
  
  Explore ScienceDirect Jan 28 2019 Dentistry
  
  Objective The aim of this in vitro study was to evaluate the ability of optical coherence tomography (OCT) to display calculus on root surfaces. Material and methods Ten teeth with calculus on the root surface were embedded in resin, omitting the root surface. A region of interest (ROI) was marked by small drill holes coronally and apically of the calculus and imaged by spectral-domain optical coherence tomography ([SD OCT], Telesto SP5, centre wavelength 1310 nm) and light microscopy (LM). To evaluate the impact of different fluids on calculus visualisation, using OCT, root surfaces were covered by a layer of NaCl ...
  Read Full Article
  
  Comment
  
  Mentions: University of Leipzig Thorlabs OCT Imaging Systems
7. Non-ionized, High-resolution Measurement of Internal and Marginal Discrepancies of Dental Prosthesis Using Optical Coherence Tomography
  
  Explore IEEE Xplore Dec 25 2018 Dentistry
  
  An internal and marginal fit between prosthesis and abutment are important factors of the durability of dental prosthesis. In this study we have proposed the use of swept-source optical coherence tomography (SS-OCT) as a novel application for non-ionized and high-resolution measurements of internal and marginal discrepancies at anatomically critical four points, such as occlusal, angle, axial, and margin during prosthesis attachment. A tooth model was fabricated by 3D printing technique and the dental prosthesis was designed using dental CAD software. The cross-sectional images along with intensity peak profile analysis of the sample were acquired using OCT system for measurements of ...
  Read Full Article
  
  Comment
  
  Mentions: Kyungpook National University Ruchire Eranga Wijesinghe
8. Polymerization shrinkage of bulk fill composite through optical coherence tomography
  
  Explore Dental Materials Dec 3 2018 Dentistry
  
  No abstract provided
  Read Full Article
  
  Comment
9. Automated Segmentation of Dental Calculus in Optical Coherence Tomography Images
  
  Explore Sensors and Materials Nov 27 2018 Dentistry
  
  The presence of dental calculus is highly correlated with the formation and advancement of periodontal disease. The occurrence and relapse of periodontal disease can be prevented only if dental calculus is completely removed. In this study, optical coherence tomography (OCT) is used to obtain two-dimensional cross-sectional images of tooth samples, in conjunction with a segmentation technique that enables automatic identification of dental calculus. We propose the vertical intensity transform function to correct the nonuniform instrument signal intensity caused by OCT. Afterwards, the detection ranges are defined by K-means or the Markov random field (MRF), and the candidate range is selected ...
  Read Full Article
  
  Comment
10. Evaluation of Optical Coherence Tomography in Dentistry
  
  Explore Home - ClinicalTrials.gov Nov 26 2018 Dentistry , Clinical Trials
  
  Optical coherence tomography (OCT) is a medical diagnostic tool, providing non-invasive, non-radiative and high resolution imaging. OCT has been established since many years in ophthalmology. In dentistry the diagnostic potential of OCT is currently increasingly being noticed. This clinical study includes two individual trials: (i) Longitudinal assessment of surface sealant thickness using optical coherence tomography and (ii) comparison of crevicular fluid levels of inflammatory cytokines after the application of surface sealants.
  Read Full Article
  
  Comment
  
  Mentions: University of Heidelberg
11. Visualization of the pulp chamber roof and residual dentin thickness by spectral-domain optical coherence tomography in vitro
  
  Explore Home - Springer Nov 17 2018 Dentistry
  
  The aim of this study was to evaluate the ability of spectral-domain optical coherence tomography (SD-OCT) to display the roof of the pulp chamber and to estimate the residual dentin thickness (RDT) of the pulp complex. The roots of 20 extracted human molars were embedded in epoxy resin, and crowns were longitudinally sectioned in the mesial-distal direction, exposing the pulp chamber. The coronal part of the crown was removed up to an RDT to the pulp chamber roof of 2 mm. Samples were imaged by SD-OCT from coronal view and by light microscopy (LM) in the sagittal plane. Using a ...
  Read Full Article
  
  Comment
  
  Mentions: University of Leipzig
12. Optical coherence tomography imaging system
  
  Explore uspto.gov Nov 13 2018 Dentistry , Patents
  
  An imaging system, a method for imaging an object of interest, and an image of the object of interest. In one embodiment, an imaging system includes a channel configured to receive information from an object of interest, a 3DSS sub-system configured to capture information from the object of interest and generate at least one of 3D surface data or 3D position data based on the information captured by the 3DSS sub-system, and an OCT sub-system configured to perform a line scan of light reflected from the object of interest, generate OCT image data from the line scan, receive the at ...
  Read Full Article
  
  Comment
13. Dental Innovations Award 2018 is awarded to project group Dental-OCT
  
  Explore mll-luebeck.com Nov 6 2018 Dentistry
  
  The Foundation for “Innovative Zahnmedizin” awards the “Dental Innovation Award 2018” in the category “Innovative Idea / Invention” to the Dental-OCT project group. Within a project funded by the AiF (Arbeitsgemeinschaft innovative Forschung), the project group consisting of the Medical Laser Center Lübeck, the Poliklinik für Zahnerhaltung und Parodontologie des Universitätsklinikum Leipzig AöR and Orange Dental GmbH realized an intraoral OCT probe to improve the restorative caries treatment. The prize was awarded to the winners at the annual meeting of the “Deutsche Gesellschaft zur Zahnerhaltung”. The award of € 3,500 will be split to the project team ...
  Read Full Article
  
  Comment
14. Histologic validation of ICDAS‐II and polarization sensitive optical coherence tomography to detect smooth surface early carious lesions
  
  Explore Wiley Online Library Nov 6 2018 Dentistry
  
  Aim This in vitro study aimed to histologically validate and compare the methods for detection of smooth surface early carious lesions (ECLs) that is , International caries detection and assessment system for the smooth surface (ICDAS‐II‐SSC), Polarization sensitive optical coherence tomography (PS‐OCT), and radiography. Methodology PS‐OCT images for scores 0‐3 of ICDAS‐II‐SSC were standardized according to ECLs’ depth. Preliminary PS‐OCT images for ICDAS‐II‐SSC score‐2 of pigmented ECLs showed reduced lesion depth and therefore were dichotomized into scores 2 and 2p for white and pigmented lesions (ICDAS‐II‐SSCm). ECLs on ...
  Read Full Article
  
  Comment
15. Is Optical Coherence Tomography a Potential Tool to Evaluate Marginal Adaptation of Class III/IV Composite Restorations In Vivo?
  
  Explore Operative Dentistry Oct 16 2018 Dentistry
  
  Objective: Margin analysis of Class III and IV composite restorations in vitro and in vivo occurred by scanning electron microscopy (SEM) and optical coherence tomography (OCT). The results were compared and related to clinical evaluation. Methods and Materials: Eight Class III composite restorations were imaged in vitro using OCT and SEM. The margins were analyzed quantitatively. OCT signals were verified by assignment to the criteria perfect margin, gap, and positive/negative ledge. In vivo quantitative margin analysis of Class III/IV composite restorations made of the micro-hybrid composite Venus combined with the self-etch adhesive iBond Gluma inside (1-SE) or etch-and-rinse ...
  Read Full Article
  
  Comment
  
  Mentions: University of Leipzig
16. Assessing surface characteristics of eroded dentine with optical coherence tomography: a preliminary in vitro validation study
  
  Explore OSA | OSA Publishing Oct 4 2018 Dentistry
  
  We conducted the first pilot study to investigate the use of the attenuation coefficient from an optical coherence tomography (OCT) backscattered signal as a measure of surface roughness changes in eroded dentine at an early stage of the erosion process. Ten human premolar root samples were subjected to citric acid treatment before scanning by OCT. The extracted relative attenuation coefficient (
  Read Full Article
  
  Comment
17. Visualization of interfacial adhesive defects at dental restorations with spectral domain and polarization sensitive optical coherence tomography
  
  Explore Home Oct 2 2018 Dentistry
  
  Restoration loss based on interfacial adhesive defects and associated caries at the restoration margin are the main causes for invasive replacement of dental restorations. Assessment of the interfacial quality based on clinical inspection and radiographic examination is often difficult and not reliable. In this work, we present spectral domain optical coherence tomography (SDOCT) and polarization sensitive optical coherence tomography (PSOCT) for the evaluation of tooth-composite bond failure. Imaging of two composite restorations at the occlusal surface are presented using intensity-based images obtained by SDOCT and PSOCT based degree of polarization uniformity (DOPU). Both modalities revealed several defects beneath the surface ...
  Read Full Article
  
  Comment
  
  Mentions: Julia Walther Dresden University of Technology Edmund Koch
18. Optical coherence tomography follow‐up of patients treated from periodontal disease
  
  Explore Wiley Online Library Sep 27 2018 Dentistry
  
  Optical coherence tomography (OCT) is one of the most important imaging modalities for biophotonics applications. In this work, an important step towards the clinical use of OCT in dental practice is reported, by following‐up patients treated from periodontal disease (PD). 147 vestibular dental sites from 14 patients diagnosed with PD were evaluated prior and after treatment, using a swept‐source OCT and two periodontal probes (Florida probe and North Carolina) for comparison. The evaluation was performed at four stages: day 0, day 30, day 60 and day 90. Exceptionally one patient was evaluated 1‐year after treatment. It was ...
  Read Full Article
  
  Comment
  
  Mentions: Anderson S. L. Gomes Federal University of Pernambuco Luana Osório Fernandes
19. A non‐invasive imaging and measurement using optical coherence tomography angiography for the assessment of gingiva: An in vivo study
  
  Explore Wiley Online Library Aug 16 2018 Dentistry
  
  Gingiva is the soft tissue that surrounds and protects the teeth. Healthy gingiva provides an effective barrier to periodontal insults to deeper tissue, thus is an important indicator to a patient’s periodontal health. Current methods in assessing gingival tissue health, including visual observation and physical examination with probing on the gingiva, are qualitative and subjective. They may become cumbersome when more complex cases are involved, such as variations in gingival biotypes where feature and thickness of the gingiva are considered. A non‐invasive imaging technique providing depth‐resolved structural and vascular information is necessary for an improved assessment of ...
  Read Full Article
  
  Comment
  
  Mentions: Oregon Health & Science University University of Washington Ruikang K. Wang
20. Comparative study on the detection of early dental caries using thermo-photonic lock-in imaging and optical coherence tomography
  
  Explore OSA | OSA Publishing Aug 3 2018 Dentistry
  
  Early detection of dental caries is known to be the key to the effectiveness of therapeutic and preventive approaches in dentistry. However, existing clinical detection techniques, such as radiographs, are not sufficiently sensitive to detect and monitor the progression of caries at early stages. As such, in recent years, several optics-based imaging modalities have been proposed for the early detection of caries. The majority of these techniques rely on the enhancement of light scattering in early carious lesions, while a few of them are based on the enhancement of light absorption at early caries sites. In this paper, we report ...
  Read Full Article
  
  Comment
21. Optical coherence tomography as a non-invasive method of enamel thickness diagnosis after orthodontic treatment by 3 different types of brackets
  
  Explore advances.umed.wroc.pl Jul 31 2018 Dentistry
  
  Background. Medical digital imaging isthe basis ofeffective medical diagnosis and isnow inthe mainstream ofadynamically developing branch ofscience. Optical coherence tomography (OCT) enables real-time insitu imaging of tissues without the need for biopsy, histological procedures or X-rays. Objectives. The aim of the study was to evaluate the application of OCT in orthodontic diagnostics and clinical practice byassessing the thickness of the enamel before and after orthodontic treatment. Material and methods. A hundred and eighty teeth in this in vitro study were divided into 3 groups of60 teeth each. Ineach group (Group1 –metal brackets, Group2 – ceramic brackets and Group3 – composite brackets), the ...
  Read Full Article
  
  Comment
  
  Mentions: Robert Koprowski
22. Wide field of view optical coherence tomography for structural and functional diagnoses in dentistry
  
  Explore SPIE Digital Library Jul 18 2018 Dentistry
  
  We report herein the fabrication and performance response of a three-dimensional (3-D) intraoral scan probe based on optical coherence tomography (OCT) that enables 3-D structural and functional diagnoses of the human teeth. The OCT system was configured using a swept-source OCT (SS-OCT) with a center wavelength of 1310 nm. The scan probe was built using an MEMS mirror and an optical collimator. The implemented SS-OCT equipped with the MEMS-based scan probe yielded an axial resolution of 10 μm and a scan range of 8 × 8 mm 2 . Two-dimensional (2-D) cross-sectional images of the teeth were acquired by the scan probe ...
  Read Full Article
  
  Comment
  
  Mentions: Jonghyun Eom
23. Effect of a coating material containing surface reaction-type pre-reacted glass-ionomer filler on prevention of primary enamel demineralization detected by optical coherence tomography
  
  Explore jstage.jst.go.jp Jul 14 2018 Dentistry
  
  We used optical coherence tomography to examine the effect of a coating material containing surface reaction-type pre-reacted glass-ionomer (S-PRG) filler on primary enamel demineralization in 18 extracted human primary teeth. The pulp was removed, and each tooth was ultrasonically cleaned with distilled water. Six teeth were treated with 0.1-M lactic acid buffer solution (De group). In the second group (n = 6), a thin film of coating material was applied before demineralization (PRG group). A third group (Control group; n = 6) was maintained in artificial saliva. Using optical coherence tomography, we measured peak signal intensity (dB) and width at 1 ...
  Read Full Article
  
  Comment
24. Assessment of root caries under wet and dry conditions using swept-source optical coherence tomography (SS-OCT)
  
  Explore jstage.jst.go.jp Jul 7 2018 Dentistry
  
  The purpose of this study was to compare optical properties of root caries under two observing conditions using swept-source optical coherence tomography (SS-OCT). In vitro and natural root caries were observed by SS-OCT under wet and dry conditions, followed by confocal laser scanning microscope (CLSM) and transverse microradiography (TMR). Signal intensity (SI), distance between SI peaks (SI-distance) and optical lesion depth were obtained from OCT. Lesion depth was measured from CLSM; lesion depth (LD TMR ) and mineral loss (ML) were obtained from TMR. In vitro root caries under wet and dry conditions showed different OCT images and SI patterns. Lesion ...
  Read Full Article
  
  Comment
  
  Mentions: University of Washington Yasunori Sumi Tokyo Medical & Dental University
1-24 of 485 1 2 3 4 ... 19 20 21 »