1. Articles in category: Dentistry

    1-24 of 499 1 2 3 4 ... 19 20 21 »
    1. OCT-Based Tooth Scan and Reconstruction

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

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

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

      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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    5. Treatment of Periodontal Disease in Systemic Lupus Erythematosus

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

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

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

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

      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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    10. Research Scientist for Optical Diagnostic at Carestream Dental

      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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    11. Physical Sciences Receives NIH Grant for Optical Prove for Real-Time Assessment of Periodontal Health Status

      Physical Sciences Receives NIH Grant for Optical Prove for Real-Time Assessment of Periodontal Health Status

      Physical Sciences Incorporated Received a 2019 NIH Grant for $641,715 for Optical Prove for Real-Time Assessment of Periodontal Health Status. The principal investigator is Nicusor Iftimia. The program began in 2013 and ends in 2020. Below is a summary of the proposed work. Physical Sciences, Inc. (PSI), in collaboration with The Forsyth Institute, Cambridge, MA is proposing to develop a technology that will address a major unmet medical need in periodontology: the lack of tools to quantitatively and objectively assess the health/disease status of the gingival soft tissues. The proposed technology will combine high resolution micro-Optical Coherence Tomography ...

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    12. Analysis of Enamel Loss by Prophylaxis and Etching Treatment in Human Tooth Using Optical Coherence Tomography: An In Vitro Study

      Analysis of Enamel Loss by Prophylaxis and Etching Treatment in Human Tooth Using Optical Coherence Tomography: An In Vitro Study

      Bonding of braces is an essential part in contemporary orthodontic treatment. For the proper strength of bracket bonding, enamel conditioning or surface treatment on tooth surface is required. Treatment on the tooth surface such as prophylaxis smoothing with pumice and enamel etching results in considerable damages to the enamel surface of the tooth. In this study, we have proposed optical coherence tomography as a noninvasive imaging technique for the evaluation of damage induced during such treatment procedures. Using depth intensity analysis of the obtained cross-sectional images, the damage resulting to the enamel surface was studied after prophylaxis smoothening and etching ...

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    13. Method and apparatus for measuring and displaying dental plaque, gingiva, and alveolar bone

      Method and apparatus for measuring and displaying dental plaque, gingiva, and alveolar bone

      A method and an apparatus for measuring and displaying dental plaque are provided, and the method includes the steps of dividing near infrared light output from a light source into measurement light and reference light, applying the measurement light toward a tooth in an oral cavity and scanning the tooth with the measurement light, producing interference light from reflected light and back-scattered light from the tooth and the reference light, generating an optical coherence tomographic image based on a scattering intensity value of the interference light, extracting a dental plaque region having a specific scattering intensity value from the optical ...

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    14. MODERN APPROACHES OF ANALYSIS AND TREATMENT OF ENDODONTIC LESIONS USING THE ENDOSCOPE AND THE OPTICAL COHERENCE TOMOGRAPHY

      MODERN APPROACHES OF ANALYSIS AND TREATMENT OF ENDODONTIC LESIONS USING THE ENDOSCOPE AND THE OPTICAL COHERENCE TOMOGRAPHY

      Aim of the study: The main reason of the present study is to analyze and record the evolution of two revolutionary methods in dental medicine with which endodontic treatments can be performed as well as the evaluation of their quality that appeared in the last twenty years. Materials and Methods: An electronic search was done on Research Gate, Science Direct and PubMed using terms about modern endodontic treatments between 1990 and 2019. Every article containing the terms of interest has been read carefully and selected according to its importance in this article. Terms used for search included: Endoscopy; Tooth Anatomy ...

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    15. Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns

      Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns

      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 ...

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    16. Fried Illuminates the Future of Dentistry

      Fried Illuminates the Future of 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 ...

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    17. Remineralizing Potential of Nano-Silver-Fluoride for Tooth Enamel: An Optical Coherence Tomography Analysis

      Remineralizing Potential of Nano-Silver-Fluoride for Tooth Enamel: An Optical Coherence Tomography Analysis

      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 ...

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    18. Three-dimensional assessment of proximal contact enamel using optical coherence tomography

      Three-dimensional assessment of proximal contact enamel using optical coherence tomography

      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 ...

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    19. Detection of enamel subsurface lesions by swept-source optical coherence tomography

      Detection of enamel subsurface lesions by swept-source optical coherence tomography

      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 ...

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    20. Evaluation of calculus imaging on root surfaces by spectral-domain optical coherence tomography

      Evaluation of calculus imaging on root surfaces by spectral-domain optical coherence tomography

      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 ...

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    21. Non-ionized, High-resolution Measurement of Internal and Marginal Discrepancies of Dental Prosthesis Using Optical Coherence Tomography

      Non-ionized, High-resolution Measurement of Internal and Marginal Discrepancies of Dental Prosthesis Using Optical Coherence Tomography

      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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    22. Automated Segmentation of Dental Calculus in Optical Coherence Tomography Images

      Automated Segmentation of Dental Calculus in Optical Coherence Tomography Images

      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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    23. Evaluation of Optical Coherence Tomography in Dentistry

      Evaluation of Optical Coherence Tomography in Dentistry

      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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    1-24 of 499 1 2 3 4 ... 19 20 21 »
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