1. Articles in category: Dentistry

    1-24 of 513 1 2 3 4 ... 20 21 22 »

    1. Evaluation of Crack Formation and Propagation with Ultrasonic Root-End Preparation and Obturation Using a Digital Microscope and Optical Coherence Tomography

      Explore Hindawi Publishing Corporation Dentistry
      Evaluation of Crack Formation and Propagation with Ultrasonic Root-End Preparation and Obturation Using a Digital Microscope and Optical Coherence Tomography

      Objective . This study is aimed at determining (1) the effect of root-end resection, ultrasonic root-end preparation, and root-end filling on the incidence of crack formation and propagation by using a digital microscope (DM) and optical coherence tomography (OCT) and (2) the performance of OCT on the detection of cracks by comparing with microcomputed tomography (micro-CT) as a reference standard. Methodology . Thirty extracted lower incisors were endodontically treated and subjected to root-end resection and ultrasonic root-end cavity preparation. Then, the teeth were divided into three groups ( , each), and the root-end cavity was either left unfilled or filled with mineral trioxide aggregate ...

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      Mentions: Tokyo Medical & Dental University Arata Ebihara

    2. Optical coherence tomography for orthodontic aligners

      Explore uspto.gov Dentistry , Patents
      Optical coherence tomography for orthodontic aligners

      Methods and apparatuses for 3D imaging (including 3D optical coherence tomography imaging) to measure the shape of orthodontic aligners, teeth, and other oral structures simultaneously, in-vivo or in-vitro. These methods and apparatuses may be used to determine contact locations of aligners with teeth and/or teeth with other teeth with very high precision, including determining the size of gaps where they are not in contact. These measurements may be used design, modify or replace an aligner and/or to verify aligner fit. 3D models of the whole aligner and teeth may be generated.

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    3. Demineralization detection in orthodontics using an ophthalmic optical coherence tomography device equipped with a multicolor fluorescence module

      Explore Home - Springer Dentistry
      Demineralization detection in orthodontics using an ophthalmic optical coherence tomography device equipped with a multicolor fluorescence module

      Objectives Demineralizations such as white spot lesions are among the most prevalent side effects during orthodontic treatment. Fluorescence devices, including quantitative light-induced fluorescence (QLF), exploiting the intrinsic fluorescence of enamel and teeth and most recently optical coherence tomography (OCT) were introduced for early demineralization detection. In addition to near-infrared OCT scanning, multicolor modules allow for imaging with different laser wavelengths and the detection of reflective- and fluorescent light. The aim of this study was to evaluate a modified multicolor ophthalmic OCT device for the detection of early carious lesions in vitro and in vivo. Materials and methods Twenty-seven extracted lesion ...

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      Mentions: University of Heidelberg

    4. EVALUATION OF POROSITY AND BIOFILM FORMATION IN RELINE RESINS THROUGH OPTICAL COHERENCE TOMOGRAPHY

      Explore ScienceDirect Dentistry
      EVALUATION OF POROSITY AND BIOFILM FORMATION IN RELINE RESINS THROUGH OPTICAL COHERENCE TOMOGRAPHY

      Objective To evaluate the porosity and adhesion of mixed colony microorganisms in reline resins by means of optical coherence tomography (OCT). Study Design Two commercial brands of reline resins (Soft-Comfort and Coe-Comfort) were used, divided into 2 groups, and 10 samples were made for each group. Samples were submitted to OCT scanning before and after 96 hours inoculation with Candida albicans . The OCT images were composed of 2000 columns and 512 lines, obtained from a commercial model, Callisto SD-OCT (Thorlabs, USA), operating at 930 nm of central wavelength and 7 μm of axial resolution in the air. After the images ...

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      Mentions: Anderson S. L. Gomes

    5. The Use of Optical Coherence Tomography as a Diagnostic Tool for Dental Caries (Thesis)

      Explore UCL Discovery Dentistry , Student Theses
      The Use of Optical Coherence Tomography as a Diagnostic Tool for Dental Caries (Thesis)

      Dental caries is one of the most common human diseases, 60-90% of school children worldwide have dental cavities. Severity can vary, from early demineralisation, which preventive measures can improve, to cavitation, leading to fillings. Different diagnostic tools are available, such as clinical examination, radiographic investigation and Enhanced Visual examination/International Caries Detection and Assessment System (ICDAS). To date, there is no universal diagnostic tool that can be used to detect carious lesions at the very early stages. Optical Coherence Tomography (OCT) is a non-invasive and ionising radiation free technique that has been used in dentistry, but not to diagnose caries ...

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      Mentions: University College London

    6. OCT-Based Periodontal Inspection Framework

      Explore MDPI Open Access Journals Platform Dentistry
      OCT-Based Periodontal Inspection Framework

      Periodontal diagnosis requires discovery of the relations among teeth, gingiva (i.e., gums), and alveolar bones, but alveolar bones are inside gingiva and not visible for inspection. Traditional probe examination causes pain, and X-ray based examination is not suited for frequent inspection. This work develops an automatic non-invasive periodontal inspection framework based on gum penetrative Optical Coherence Tomography (OCT), which can be frequently applied without high radiation. We sum up interference responses of all penetration depths for all shooting directions respectively to form the shooting amplitude projection. Because the reaching interference strength decays exponentially with tissues’ penetration depth, this projection ...

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      Mentions: National Yang-Ming University

    7. Use of Optical Coherence Tomography in a Patient with Erosive Oral Lichen Planus Treated with Low-Level Laser Therapy. Preliminary Findings

      Explore MDPI Open Access Journals Platform Dentistry
      Use of Optical Coherence Tomography in a Patient with Erosive Oral Lichen Planus Treated with Low-Level Laser Therapy. Preliminary Findings

      Clinical studies have demonstrated the effectiveness of low-level laser therapy (LLLT) in patients with unresponsive oral lichen planus (OLP). OCT can reveal, in real time, the architecture of epithelial and sub-epithelial tissues and surrounding structures [1]. Aim of the present work was to assess the in-vivo changes of oral mucosa before and after LLLT treatment in a patient affected by erosive OLP.

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    8. Oral Diagnosis Minimally Invasive Imaging Approaches (Textbook)

      Explore Home - Springer Dentistry , Textbooks
      Oral Diagnosis Minimally Invasive Imaging Approaches (Textbook)

      The overall goal of this book is to provide the reader with an understanding of the new minimally invasive techniques that are available for the purpose of diagnostic imaging in dentistry and to explain their impact on clinical practice. The book concentrates very much on those techniques that are clinically applicable and useful to dentists NOW, although it also provides a fascinating view to the future. The chapters are divided according to the major clinical topics in dentistry. Each chapter provides considerable visual content, including flow charts, schematics, and photographs. The principles of the technologies presented are discussed in an ...

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    9. Identification of multi-dimensional thread geometry using depth-resolved swept-source optical coherence tomography for assessment of dental implant fabrication

      Explore ScienceDirect Dentistry
      Identification of multi-dimensional thread geometry using depth-resolved swept-source optical coherence tomography for assessment of dental implant fabrication

      The geometrical characteristics of dental implants, such as thread depth and width, facing angle, pitch, and surface roughness, are important to assess their stability and osseointegration after implant surgery. Herein, we demonstrate the potential use of depth-resolved swept-source optical coherence tomography (SS-OCT) to assess the structural quality of widely used dental implants. The implemented SS-OCT system was centered at a wavelength of 1300 nm with a 100 nm full-width at half-maximum. Four dental implants with different structural formations fabricated using either titanium or ceramic were visualized. Qualitative assessments were performed using boundary flattening with an amplitude-profiling algorithm to emphasize and ...

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      Mentions: Jeehyun Kim Kyungpook National University Ruchire Eranga Wijesinghe

    10. Early detection of enamel demineralization by optical coherence tomography

      Explore Nature Publishing Group Dentistry
      Early detection of enamel demineralization by optical coherence tomography

      Enamel is the outermost layer of the tooth that protects it from invasion. In general, an acidic environment accelerates tooth demineralization, leading to the formation of cavities. Scanning electron microscopy (SEM) is conventionally used as an in vitro tool for the observation of tooth morphology changes with acid attacks. Yet, SEM has intrinsic limitations for the potential application of in vivo detection in the early demineralization process. In this study, a high-resolution optical coherence tomography (OCT) system with the axial and transverse resolutions of 2.0 and 2.7 μm in teeth has been utilized for characterizing the effect of ...

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      Mentions: National Taiwan University Meng-Tsan Tsai Chang Gung University

    11. An Experimental Review of Optical Coherence Tomography Systems for Noninvasive Assessment of Hard Dental Tissues

      Explore Karger Publishers Dentistry
      An Experimental Review of Optical Coherence Tomography Systems for Noninvasive Assessment of Hard Dental Tissues

      Optical coherence tomography (OCT) is a noninvasive, high-resolution, cross-sectional imaging technique. To date, OCT has been demonstrated in several areas of dentistry, primarily using wavelengths around 1,300 nm, low numerical aperture (NA) imaging lenses, and detectors insensitive to the polarization of light. The objective of this study is to compare the performance of three commercially available OCT systems operating with alternative wavelengths, imaging lenses, and detectors for OCT imaging of dental enamel. Spectral-domain (SD) OCT systems with (i) 840 nm (Lumedica, OQ LabScope 1.0), (ii) 1,300 nm (Thorlabs, Tel320) center wavelengths, and (iii) a swept-source (SS) OCT ...

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      Mentions: Hrebesh M. Subhash

    12. Optical Coherence Tomography for Imaging Dental Caries (Book Chapter)

      Explore Home - Springer Dentistry , Textbooks
      Optical Coherence Tomography for Imaging Dental Caries (Book Chapter)

      Optical Coherence tomography (OCT) is a noninvasive technique that can be used to measure reflectivity within dental hard tissues. Due to the strong reflection at the tooth surfaces, the contrast between sound and demineralized tissues can be enhanced by use of polarization. Polarized sensitive OCT (PS-OCT) can monitor demineralization and remineralization. Clinical studies have indicated that OCT was able to demonstrated penetration into DEJ more reliably that radiographs in questionable occlusal caries. In root caries, the system was able to discriminate sound dentin from demineralized dentin, assess cementum thickness and determine lesion severity by using shrinkage of dentin as a ...

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      Mentions: Daniel S. Fried UCLA

    13. Does lining class-II cavities with flowable composite improve the interfacial adaptation?

      Explore Taylor & Francis Online Dentistry
      Does lining class-II cavities with flowable composite improve the interfacial adaptation?

      The objective of this study was to assess in-vitro interfacial cavity adaptation of different adhesive/composites systems in class-II restoration using SS-OCT and to confirm the findings with a confocal laser scanning microscope (CLSM). Standardized rectangular-shaped class-II cavities were prepared on 24 extracted human molar teeth, bonded with adhesive and lined with flowable composite. Cavities were further restored by bulk filling using packable composite. Specimens were divided into four groups ( n  = 7) according to restorative materials used; PrimeFil with Estelite Posterior composites (PF; Tokuyama Dental), Clearfil Tri-S Bond Plus with Majesty LV flowable and Majesty Posterior composites (TS; Kuraray Noritake ...

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      Mentions: University of Washington Alireza Sadr Junji Tagami

    14. Measurement of the Shrinkage of Natural and Simulated Lesions on Root Surfaces using CP-OCT

      Explore ScienceDirect Dentistry
      Measurement of the Shrinkage of Natural and Simulated Lesions on Root Surfaces using CP-OCT

      Objectives Demineralized root dentin and cementum is made up of mostly collagen that shrinks significantly upon dehydration or drying with air. During remineralization mineral is deposited on the outside of the lesion creating a highly mineralized surface layer that inhibits diffusion, arrests the lesion and prevents shrinkage. Previous studies suggest that active root caries lesions manifest shrinkage, while arrested lesions no longer manifest shrinkage upon dehydration. The purpose of this study was to demonstrate that the shrinkage of root caries lesions can be monitored during dehydration using an optical coherence tomography probe suitable for clinical use. Methods In this in ...

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      Mentions: Daniel S. Fried UCLA

    15. OCT-Based Tooth Scan and Reconstruction

      Explore MDPI Open Access Journals Platform Dentistry
      OCT-Based Tooth Scan and Reconstruction

      Digital dental reconstruction can be a more efficient and effective mechanism for artificial crown construction and period inspection. However, optical methods cannot reconstruct those portions under gums, and X-ray-based methods have high radiation to limit their applied frequency. Optical coherence tomography (OCT) can harmlessly penetrate gums using low-coherence infrared rays, and thus, this work designs an OCT-based framework for dental reconstruction using optical rectification, fast Fourier transform, volumetric boundary detection, and Poisson surface reconstruction to overcome noisy imaging. Additionally, in order to operate in a patient’s mouth, the caliber of the injector is small along with its short penetration ...

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      Mentions: National Taiwan University National Yang-Ming University

    16. An Experimental Review of Optical Coherence Tomography Systems for Noninvasive Assessment of Hard Dental Tissues

      Explore Karger Publishers Dentistry
      An Experimental Review of Optical Coherence Tomography Systems for Noninvasive Assessment of Hard Dental Tissues

      Optical coherence tomography (OCT) is a noninvasive, high-resolution, cross-sectional imaging technique. To date, OCT has been demonstrated in several areas of dentistry, primarily using wavelengths around 1,300 nm, low numerical aperture (NA) imaging lenses, and detectors insensitive to the polarization of light. The objective of this study is to compare the performance of three commercially available OCT systems operating with alternative wavelengths, imaging lenses, and detectors for OCT imaging of dental enamel. Spectral-domain (SD) OCT systems with (i) 840 nm (Lumedica, OQ LabScope 1.0), (ii) 1,300 nm (Thorlabs, Tel320) center wavelengths, and (iii) a swept-source (SS) OCT ...

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      Mentions: Mark C. Pierce Hrebesh M. Subhash

    17. In vitro longitudinal evaluation of enamel wear by cross-polarization optical coherence tomography

      Explore ScienceDirect Dentistry
      In vitro longitudinal evaluation of enamel wear by cross-polarization optical coherence tomography

      Objectives Enamel thickness determination by Cross-Polarization Optical Coherence Tomography (CP-OCT) is a promising approach for quantitative monitoring of tooth wear progression. This study evaluated the ability of CP-OCT to quantify the thickness of natural enamel before, during and after tooth wear simulation. Materials and Methods Natural, unpolished human dental enamel slabs were submitted to five wear stages (Wear 1: to level the surfaces; Wear 2 to Wear 5: 0.05 ± 0.02 mm reduction each) simulated by an automatic grinding/polishing machine. Enamel thickness was evaluated with CP-OCT and a gold-standard method (micro-CT) at baseline and after every wear stage ...

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      Mentions: Indiana University Daniel S. Fried UCSF

    18. Indiana University Receives NIH Grant for Objective Outcome Measure for clinical Assessment of Erosive Tooth Wear

      Explore Optical Coherence Tomography News Dentistry , Funding
      Indiana University Receives NIH Grant for Objective Outcome Measure for clinical Assessment of Erosive Tooth Wear

      Indiana University Receives a 2019 NIH Grant for $198,747 for Objective Outcome Measure for clinical Assessment of Erosive Tooth Wear. The principal investigator is Anderson Hara. Below is a summary of the proposed work. Erosive tooth wear (ETW) is a multifactorial and cumulative condition of growing prevalence that leads to substantial loss of dental structure, resulting in pain and harm to dental function and esthetics. Specifically in the USA, it affects approximately 46% of teenagers and 80% of adults. Despite these alarming numbers, USA dental professionals are largely unaware of this condition, and specific diagnostic set rules and management ...

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      Mentions: Indiana University

    19. Treatment of Periodontal Disease in Systemic Lupus Erythematosus

      Explore Home - ClinicalTrials.gov Dentistry , Clinical Trials
      Treatment of Periodontal Disease in Systemic Lupus Erythematosus

      Many studies have conducted to evaluate the relationship of systemic inflammatory diseases with periodontal disease. Previous evaluations suggest that there is no significant association between patients with Systemic lupus erythematosus (SLE) and Periodontitis (PD). However, some of the studies have shown relevancy between these two inflammatory diseases and have suggested to explore more for further knowledge. The aim of the study is to establish and investigate a relationship between SLE and PD. The study which will take place in two centers and will recruit 30 patients which will enter a pilot randomized controlled trial. Individuals enrolled into the study will ...

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    20. Swept-source optical coherence tomographic observation on prevalence and variations of cemento-enamel junction morphology

      Explore Home - Springer Dentistry
      Swept-source optical coherence tomographic observation on prevalence and variations of cemento-enamel junction morphology

      To investigate the prevalence of different patterns of cemento-enamel junction (CEJ) morphology under swept-source optical coherence tomography (SS-OCT). One hundred extracted human teeth were used consisting of incisors, premolars, and molars. Each sample was observed for every 500 μm circumferentially along CEJ and OCT images of the pattern were noted. Microscopic observations were done for the representative sample using confocal laser scanning microscope (CLSM) and transmission electron microscope (TEM). The OCT images exhibited four CEJ patterns: edge-to-edge (type I), exposed dentin (type II), cementum overlapping enamel (type III), and enamel overlapping cementum (type IV). The prevalence of CEJ patterns was ...

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      Mentions: Yasunori Sumi Tokyo Medical & Dental University University of Hong Kong

    21. Characterization and Comparative Analysis of Voids in Class II Composite Resin Restorations by Optical Coherence Tomography

      Explore Operative Dentistry Dentistry
      Characterization and Comparative Analysis of Voids in Class II Composite Resin Restorations by Optical Coherence Tomography

      Purpose This study aimed to characterize and analyze the number of voids and the percentage of void volume within and between the layers of class II composite restorations made using the bulk fill technique or the incremental technique by optical coherence tomography (OCT). Methods and Materials Class II cavities (4×4×2 mm) were prepared in 48 human third molars (n=24 restorations per group, two class II cavities per tooth). Teeth were divided into four groups and restored as follows: group 1 (FOB), bulk filled in a single increment using Filtek One Bulk Fill (3M Oral Care); group 2 ...

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      Mentions: University of São Paulo Anderson Z. Freitas

    22. Detection of Simulated Periradicular Lesions in Porcine Bone by Optical Coherence Tomography

      Explore Journal of Endodontics Dentistry
      Detection of Simulated Periradicular Lesions in Porcine Bone by Optical Coherence Tomography

      Introduction The accurate detection of periradicular lesions located under a nonperforated cortical plate poses a challenge in endodontic microsurgery. Optical coherence tomography (OCT) is a noninvasive imaging method that has been successfully used in many dental applications. In this study, we investigated if spectral-domain OCT (SD-OCT) could be used to determine simulated periradicular lesions. Methods Twenty-eight cavities with different depths were prepared on bone plates obtained from 5 porcine mandibles. Both 3-dimensional SD-OCT imaging and micro–computed tomographic (micro-CT) imaging were used to image the bottom of the air-filled cavity and the cavity filled with soft tissue for comparison. The ...

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      Mentions: Tokyo Medical & Dental University Alireza Sadr Yonghong He

    23. A Comparison Study of Marginal and Internal Fit Assessment Methods for Fixed Dental Prostheses

      Explore MDPI Open Access Journals Platform Dentistry
      A Comparison Study of Marginal and Internal Fit Assessment Methods for Fixed Dental Prostheses

      Numerous studies have previously evaluated the marginal and internal fit of fixed prostheses; however, few reports have performed an objective comparison of the various methods used for their assessment. The purpose of this study was to compare five marginal and internal fit assessment methods for fixed prostheses. A specially designed sample was used to measure the marginal and internal fit of the prosthesis according to the cross-sectional method (CSM), silicone replica technique (SRT), triple scan method (TSM), micro-computed tomography (MCT), and optical coherence tomography (OCT). The five methods showed significant differences in the four regions that were assessed ( p < 0 ...

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      Mentions: Kyungpook National University Mansik Jeon

    24. Research Scientist for Optical Diagnostic at Carestream Dental

      Explore Optical Coherence Tomography News Dentistry , Jobs & Studentships
      Research Scientist for Optical Diagnostic at Carestream Dental

      We are seeking a Research Scientist for Optical Diagnostics to be part of an innovative research team (based in Rochester, New York) that develops new optical devices for improving measurements and diagnoses in dentistry. Position Description: Research Scientist who will research and develop new optical technologies for dental measurements and diagnostics Conceptualize and demonstrate new applications of optics and photonics in solving problems in modern dentistry and advancing the field Design, implement, and develop experimental and prototype systems and perform clinical evaluation Collaborate with a multi-disciplinary team to translate technology solution into commercial product H-1B Candidates are welcome to apply ...

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      Mentions: Carestream Dental
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