Dentistry -Optical Coherence Tomography News

Articles in category: Dentistry

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1. 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
2. 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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3. 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
4. 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
5. 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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6. 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
7. 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
8. 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
9. 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
10. 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
11. 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
12. 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
13. Emerging Imaging Technologies in the Dentomaxillofacial Region
  
  Explore ScienceDirect May 8 2018 Dentistry
  
  No abstract provided.
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  Mentions: University of Texas Health Science Center
14. Quantitative measurement of peri-implant bone defects using optical coherence tomography
  
  Explore jpis.org May 8 2018 Dentistry
  
  Purpose The purpose of this study was to visualize and identify peri-implant bone defects in optical coherence tomography (OCT) images and to obtain quantitative measurements of the defect depth. Methods Dehiscence defects were intentionally formed in porcine mandibles and implants were simultaneously placed without flap elevation. Only the threads of the fixture could be seen at the bone defect site in the OCT images, so the depth of the peri-implant bone defect could be measured through the length of the visible threads. To analyze the reliability of the OCT measurements, the flaps were elevated and the depth of the dehiscence ...
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  Mentions: Seoul National University
15. Optical coherence tomography to evaluate variance in the extent of carious lesions in depth
  
  Explore Home - Springer May 7 2018 Dentistry
  
  Evaluation of variance in the extent of carious lesions in depth at smooth surfaces within the same ICDAS code group using optical coherence tomography (OCT) in vitro and in vivo. (1) Verification/validation of OCT to assess non-cavitated caries: 13 human molars with ICDAS code 2 at smooth surfaces were imaged using OCT and light microscopy. Regions of interest (ROI) were categorized according to the depth of carious lesions. Agreement between histology and OCT was determined by unweighted Cohen’s Kappa and Wilcoxon test. (2) Assessment of 133 smooth surfaces using ICDAS and OCT in vitro, 49 surfaces in vivo ...
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  Mentions: University of Leipzig
16. Evaluation of marginal gap of lithium disilicate glass ceramic crowns with optical coherence tomography
  
  Explore SPIE Digital Library Mar 4 2018 Dentistry
  
  arginal gap (MG) was the most important factor to evaluate the success of crowns. The study was to assess the MG of lithium disilicate glass ceramic crowns with spectral domain optical coherence tomography (OCT) and stereomicroscopy in vitro , and to provide evidence to measure the MG with OCT. Consistency was observed between OCT and stereomicroscopy to measure the MG after cementation. There was no significant difference between the MG of lithium disilicate glass ceramic crowns using OCT and stereomicroscopy (OCT 59.55 ± 7.22 μ m, stereomicroscope 59.48 ± 6.53 μ m, P = 0.736) after cementation. OCT was a noninvasive ...
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  Mentions: Capital Medical University Chinese Academy of Sciences Peking University
17. Evaluation of the polymerization shrinkage of experimental flowable composite resins through optical coherence tomography
  
  Explore SPIE Digital Library Feb 27 2018 Dentistry , NDE/NDT
  
  This study evaluated the polymerization shrinkage of two experimental flowable composite resins (CR) with different proportions of Urethane dimethacrylate (UDMA)/triethylene glycol dimethacrylate (TEGDMA) monomers in the organic matrix (50:50 and 60:40, respectively). A commercially available flowable CR, Tetric N-Flow (Ivoclair Vivadent, Liechtenstein, Germany), was employed as the control group. The resins were inserted in a cylindrical teflon mold (7 mm diameter, 0.6 mm height) and scanned with OCT before photoactivation, immediately after and 15 minutes after light-curing (Radii-Cal, SDI, Australia, 1,200 mW/cm 2 ) exposure. A Callisto SD-OCT system (Thorlabs Inc, USA), operating at 930 ...
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  Mentions: Thorlabs Anderson S. L. Gomes Federal University of Pernambuco
18. Silver nanoparticles as optical clearing agent enhancers to improve caries diagnostic by optical coherence tomography
  
  Explore SPIE Digital Library Feb 27 2018 Dentistry
  
  The use of silver nanoparticles as optical clearing agent (OCA) enhancers to improve caries diagnostic by optical coherence tomography (OCT) is demonstrated here. Five molars with no evident cavitation were selected. The OCAs were based on aqueous solution of silver nanoparticles (AgNP, 1.18x 10 14 particles/mL, ø ≈ 10nm) and its dilution at 10% in glycerol. Teeth were placed on a platform with a micrometric screw, and after applying the OCAs, they were scanned with a Callisto SD-OCT system operating ate 930nm central wavelength. The occlusal surfaces were scanned by OCT, capturing crosssectional images with 8 mm transversal scanning, generating ...
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  Mentions: Anderson S. L. Gomes Federal University of Pernambuco
19. Effect of bioglass on artificially induced enamel lesion around orthodontic brackets: OCT study
  
  Explore SPIE Digital Library Feb 13 2018 Dentistry
  
  Background and Objective: White spot lesions (WSLs) are commonly seen after completing orthodontic treatment. Different approaches have been suggested to avoid such a complication. Recently, 45S5 bioglass (BG) was introduced as remineralizing agent. Therefore, the objective of this in-vitro study was to assess the effect of BG in remineralizing WSLs using Optical coherence tomography (OCT). Methods: Fifteen human premolar teeth were sectioned and bonded to orthodontic brackets with Transbond XT primer followed by Transbond PLUS color change adhesive (3M Unitek, USA) on their smooth surfaces according to the manufacturer’s instructions. Then, all specimens were varnished excluding the area of ...
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  Mentions: Turki Bakhsh
20. Lesion dehydration rate changes with the surface layer thickness during enamel remineralization
  
  Explore SPIE Digital Library Feb 13 2018 Dentistry
  
  A transparent highly mineralized outer surface zone is formed on caries lesions during remineralization that reduces the permeability to water and plaque generated acids. However, it has not been established how thick the surface zone should be to inhibit the penetration of these fluids. Near-IR (NIR) reflectance coupled with dehydration can be used to measure changes in the fluid permeability of lesions in enamel and dentin. Based on our previous studies, we postulate that there is a strong correlation between the surface layer thickness and the rate of dehydration. In this study, the rates of dehydration for simulated lesions in ...
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  Mentions: Daniel S. Fried UCSF
21. Deep learning classifier with optical coherence tomography images for early dental caries detection
  
  Explore SPIE Digital Library Feb 13 2018 Dentistry
  
  Dental caries is a microbial disease that results in localized dissolution of the mineral content of dental tissue. Despite considerable decline in the incidence of dental caries, it remains a major health problem in many societies. Early detection of incipient lesions at initial stages of demineralization can result in the implementation of non-surgical preventive approaches to reverse the demineralization process. In this paper, we present a novel approach combining deep convolutional neural networks (CNN) and optical coherence tomography (OCT) imaging modality for classification of human oral tissues to detect early dental caries. OCT images of oral tissues with various densities ...
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  Mentions: University of Connecticut SUNY at Stony Brook
22. Influence of the Loci of Non-Cavitated Fissure Caries on Its Detection with Optical Coherence Tomography
  
  Explore ScienceDirect Feb 1 2018 Dentistry
  
  Objective The main objective of this study was to evaluate the accuracy of optical coherence tomography (OCT) in detecting naturally occurring non-cavitated fissure caries (NCFC) in totality and at different loci by visually assessing cross-sectional OCT scans (B-scan) with an interpretation criterion. The secondary objective was to evaluate the agreement between dimensions of NCFC measured with OCT and polarized light microscopy (PLM). Methods 71 investigation sites of sound fissure and naturally occurring NCFC on human extracted premolars were identified and scanned with a swept-source OCT. The teeth were then sectioned bucco-lingually at the investigation sites and imaged using PLM. Two ...
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  Mentions: University of Malaya
23. Evaluation of adaptation of ceramic inlays using optical coherence tomography and replica technique
  
  Explore scielo.br Feb 1 2018 Dentistry
  
  Optical coherence tomography (OCT) has generally been used as a nondestructive technique to evaluate integrities of composite restorations. We investigated marginal and internal adaptations of ceramic inlay restorations with OCT and compared them to results with the silicone replica technique. Round-shaped class I cavities were prepared on 16 human maxillary first premolar teeth. Ceramic inlays were fabricated. Silicone replicas from inlays were obtained and sectioned to measure marginal and internal adaptations with a stereomicroscope (Leica Dfc 295, Bensheim, Germany). Inlays were cemented on respective teeth. Marginal and internal adaptations were then measured with the OCT system (Thorlabs, New Jersey, USA ...
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  Mentions: Thorlabs Leica
24. Detection of carious lesions utilizing depolarization imaging by polarization sensitive optical coherence tomography
  
  Explore SPIE Digital Library Feb 1 2018 Dentistry
  
  As dental caries is one of the most common diseases, the early and noninvasive detection of carious lesions plays an important role in public health care. Optical coherence tomography (OCT) with its ability of depth-resolved, high-resolution, noninvasive, fast imaging has been previously recognized as a promising tool in dentistry. Additionally, polarization sensitive imaging provides quantitative measures on the birefringent tissue properties and can be utilized for imaging dental tissue, especially enamel and dentin. By imaging three exemplary tooth samples ex vivo with proximal white spot, brown spot, and cavity, we show that the combination of polarization sensitive OCT and the ...
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  Mentions: Julia Walther Dresden University of Technology Edmund Koch
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