Dentistry -Optical Coherence Tomography News

Articles in category: Dentistry

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1. 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 ...
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  Mentions: Kyungpook National University Ruchire Eranga Wijesinghe
2. Polymerization shrinkage of bulk fill composite through optical coherence tomography
  
  Explore Dental Materials Dec 3 2018 Dentistry
  
  No abstract provided
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3. 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 ...
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4. 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.
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  Mentions: University of Heidelberg
5. 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 ...
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  Mentions: University of Leipzig
6. 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 ...
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7. 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 ...
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8. 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 ...
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9. 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 ...
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  Mentions: University of Leipzig
10. 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 (
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11. 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 ...
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  Mentions: Julia Walther Dresden University of Technology Edmund Koch
12. 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 ...
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  Mentions: Anderson S. L. Gomes Federal University of Pernambuco Luana Osório Fernandes
13. 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 ...
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  Mentions: Oregon Health & Science University University of Washington Ruikang K. Wang
14. 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 ...
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15. 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 ...
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  Mentions: Robert Koprowski
16. 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 ...
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  Mentions: Jonghyun Eom
17. 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 ...
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18. 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 ...
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  Mentions: University of Washington Yasunori Sumi Tokyo Medical & Dental University
19. Optical Evaluation of Enamel Microleakage with One-Step Self-Etch Adhesives
  
  Explore Mary Ann Liebert, Inc. Jun 25 2018 Dentistry
  
  Objective: In this in vitro study, cross-polarization optical coherence tomography (CP-OCT) was used to evaluate microleakage in dental composite restorations bonded to enamel with two types of one-step self-etching (SE) adhesives. Background data: One-step SE adhesives were proposed to simplify bonding of composite restorations. However, bonding of these simplified adhesive to dental enamel is still questionable. OCT is a promising diagnostic tool that allows micron-scale imaging of biological tissues and structures. Methods: Class-V cavities (4-mm diameter × 1-mm depth) were prepared on the labial surfaces of extracted human anterior teeth with margins and floor located in enamel. The cavities were then ...
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  Mentions: Turki Bakhsh
20. Optical Quantification of Microgaps at Dentin-Composite Interface
  
  Explore IOPscience Jun 25 2018 Dentistry
  
  Objective . Microgap formation between polymer-based resin system and teeth surfaces is undetectable by conventional x-rays. Therefore, this in vitro study was designed to assess the adaptation of polymeric dental fillings and microgap formation at the tooth floor using cross-polymerization optical coherence tomography (CP-OCT). Materials and Methods . Class-I cavities (4 mm diameter × 1.5 mm depth) were prepared in twenty extracted molar teeth and divided into two groups: ESQ and DI (n = 10). All groups were bonded with Tetric-N Bond universal (Ivoclar/Vivadent) in selective etching mode. Then, each group was restored with either Estelite ∑ Quick dental composite (ESQ; Tokuyama Dental ...
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  Mentions: Turki Bakhsh
21. OCT for early quality evaluation of tooth–composite bond in clinical trials
  
  Explore ScienceDirect Jun 23 2018 Dentistry
  
  Objectives To evaluate early quality of composite restorations with a universal adhesive in different application modes clinically and with optical coherence tomography (OCT). Methods 22 patients with four non-carious cervical lesions each received composite restorations (Filtek Supreme TM XTE, 3 M). The universal adhesive Scotchbond Universal TM (SBU, 3 M) was applied with three etching protocols: self-etch (SE), selective-enamel-etch (SEE) and etch-and-rinse (ER). The etch-and-rinse adhesive OptiBond TM FL (OFL, Kerr) served as a control. Restorations were imaged by OCT (Thorlabs) directly after application (t 0 ). After 14 days (t 1 ) and 6 month (t 2 ) OCT imaging (interfacial adhesive ...
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  Mentions: Thorlabs University of Leipzig
22. Use of Optical Clearing Agents for Imaging Root Surfaces With Optical Coherence Tomography
  
  Explore IEEE Xplore Jun 23 2018 Dentistry
  
  The diagnosis of root caries and root fractures is of increasing importance due to our aging population. The objective of this study is to show that optical clearing agents can be used to increase the visibility of subsurface structures in tooth roots to aid in the diagnosis of root caries depth and extension and to differentiate from subsurface defects. Previous studies have shown that high refractive index fluids can increase the depth penetration of optical coherence tomography (OCT) for imaging caries lesions on tooth enamel. Extracted teeth with suspected root caries were imaged with (OCT) with and without the addition ...
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  Mentions: Daniel S. Fried UCSF
23. Optical Coherence Tomography in Dentistry
  
  Explore Dental Clinics of North America Jun 16 2018 Dentistry
  
  Optical coherence tomography (OCT) is a noninvasive diagnostic technique providing cross-sectional imagines of biological structure based on differences in tissue optical properties. It was first reported by Fujimoto and colleagues in 1991.
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  Mentions: Daniel S. Fried University of Texas Health Science Center UCSF
24. In vitro and clinical evaluation of optical coherence tomography for the detection of subgingival calculus and root cementum
  
  Explore jstage.jst.go.jp Jun 3 2018 Dentistry
  
  This study evaluated the effectiveness of swept-source optical coherence tomography (ss-OCT) for detecting calculus and root cementum during periodontal therapy. Optical coherence tomography (OCT) images were taken before and after removal of subgingival calculus from extracted teeth and compared with non-decalcified histological sections. Porcine gingival sheets of various thicknesses were applied to the root surfaces of extracted teeth with calculus and OCT images were taken. OCT images were also taken before and after scaling and root planing (SRP) in human patients. In vitro , calculus was clearly detected as a white-gray amorphous structure on the root surface, which disappeared after removal ...
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  Mentions: Santec Yasunori Sumi Tokyo Medical & Dental University
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