1. Articles in category: Dentistry

    1-24 of 521 1 2 3 4 ... 20 21 22 »
    1. IDENTIFICATION OF CARIOUS LESIONS IN ENAMEL USING OPTICAL COHERENCE TOMOGRAPHY

      IDENTIFICATION OF CARIOUS LESIONS IN ENAMEL USING OPTICAL COHERENCE TOMOGRAPHY

      The aim of this research was to asses wether OCT could be used for early detection of carious/ demineralised lesions in enamel. If application of Optical coherence tomography (OCT) could be used in early, chair-side detection of caries and therefore initiate the prompt treatment strategies required. 10 extracted teeth were selected with no visible carious lesion. All teeth were scanned using Xray Microtomography (XMT). Four teeth were found with areas of demineralisation which were not visible to the naked eye. The same lesions were then scanned using OCT. SAM software was used to analyse the depth of penetration. OCTview software ...

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    2. Detection of Artificial Tooth Cracks based on Optical Coherence Tomography

      Detection of Artificial Tooth Cracks based on Optical Coherence Tomography

      Due to the hidden symptoms of the tooth cracks, the existing imaging technologies have problems of insufficient resolution and inaccurate detection. In this paper, a swept-source OCT system is designed, which is suitable for the full crown scanning of different kinds of teeth. And the artificial tooth-cracked model is prepared by the temperature difference method, the tooth cracks tomographic images of incisors, premolars and molars under different preparation conditions were obtained by the swept-source OCT. The experimental results show that the swept-source OCT system can image different grades of tooth cracks and monitor the progress of cracks. At the same ...

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    3. Effect of Pretreatment and Activation Mode on the Interfacial Adaptation of Nanoceramic Resin Inlay and Self-adhesive Resin Cementv

      Effect of Pretreatment and Activation Mode on the Interfacial Adaptation of Nanoceramic Resin Inlay and Self-adhesive Resin Cementv

      Objectives The first objective of this study was to determine if the luting material used for resin nanoceramic inlay affects interfacial adaptation. The second was to investigate whether pretreatment and the adhesive curing method before cementation affects interfacial adaptation. The final objective was to compare activation modes of luting material. Methods Class I cavities were prepared on extracted human third molars. Resin nanoceramic inlays were fabricated using Lava Ultimate CAD/CAM block (3 M). For the control groups, inlays were cemented using Panavia V5 (Kuraray Noritake). For the experimental groups, teeth were randomly divided into five experimental groups with four ...

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    4. Evaluation of Neurodegenerative and Inflammatory Processes in Temporomandibular Joint Disorders Using Optical Coherence Tomography

      Evaluation of Neurodegenerative and Inflammatory Processes in Temporomandibular Joint Disorders Using Optical Coherence Tomography

      Introduction: Temporomandibular joint disorders (TMD) is a process with systemic effects rather than local effects. The purpose of this study is to examine the retinal layer structure using optical coherence tomography (OCT) method in order to detect possible degenerative and inflammatory process in patients with TMD. Material and Methods: 35 healthy controls and 34 TMD patients were evaluated bilaterally in this study. The retinal nerve fiber layer (RNFL), ganglion cell layer (GCL), inner plexiform layer (IPL) and choroidal thickness were analyzed using OCT. Results: When TMD patients were compared with healthy controls, GCL and IPL volumes and RNFL thickness decreased ...

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    5. Correlation between Lesion Progression and Depolarization Assessed by Polarization-Sensitive Optical Coherence Tomography

      Correlation between Lesion Progression and Depolarization Assessed by Polarization-Sensitive Optical Coherence Tomography

      The detection of early stages of caries is still one of the major challenges in preservative dentistry. Since it is known from polarized light microscopy (PLM) that intrinsic enamel birefringence is affected by demineralization, polarization-sensitive optical coherence tomography (PSOCT) could facilitate the noninvasive detection and assessment of early carious lesions. The present study aims to correlate enamel lesion progression and depolarization measurements based on PSOCT in an artificial demineralization model. A total of 18 enamel slabs were prepared from bovine incisor teeth and demineralized in an acetic buffer solution for up to 49 days. The degree of polarization (DOP)—indicating ...

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    6. Non‐invasive multimodal imaging by integrating optical coherence tomography with autofluorescence imaging for dental applications

      Non‐invasive multimodal imaging by integrating optical coherence tomography with autofluorescence imaging for dental applications

      We report the development of an integrated multi‐functional imaging system capable of providing anatomical (optical coherence tomography, OCT), functional (OCT angiography, OCTA) and molecular imaging (light‐induced autofluorescence, LIAF) for in vivo dental applications. Blue excitation light (405 nm) was used for LIAF imaging, while the OCT was powered by a 1310 nm swept laser source. A red‐green‐blue (RGB) digital camera, with a 450 nm cut‐on broad‐band optical filter, was used for LIAF detection. The exciting light source and camera were integrated directly with the OCT scanning probe. The integrated system used two non‐invasive ...

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    7. Diagnosis of Occlusal Caries with Dynamic Slicing of 3D Optical Coherence Tomography Images

      Diagnosis of Occlusal Caries with Dynamic Slicing of 3D Optical Coherence Tomography Images

      Detecting the extent of occlusal caries is a clinically important but challenging task required for treatment decision making. The aim of this study was to assess the diagnostic power of 3D swept-source optical coherence tomography (OCT) for evaluation of occlusal caries in comparison with X-ray radiography. Extracted human molars not exhibiting American Dental Association (ADA) criteria advanced caries were mounted in a silicone block and digital dental radiographs were captured from the buccal side. Subsequently, occlusal surfaces were scanned with a prototype Yoshida Dental OCT. Thirteen examiners evaluated the presence and extent of caries on radiographs and dynamically sliced 3D ...

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    8. Effect of Light Irradiation Condition on Gap Formation Under Polymeric Dental Restoration; OCT study

      Effect of Light Irradiation Condition on Gap Formation Under Polymeric Dental Restoration; OCT study

      Objective To investigate the effect of two light-curing systems; quartz tungsten-halogen (QTH) and light-emitting diode (LED), and irradiation time on interfacial gap formation of dental composite resin restorations bonded with an adhesive resin using optical coherence tomography (OCT). Materials and Methods Forty cavities were prepared in extracted human molar teeth and divided into four groups (n = 10) based on the type of light curing system QTH (LITEX 680A) and LED (Demi Plus) and curing duration (10 s or 40 s). A single-step self-etching dental adhesive (Tetric® N-Bond; Ivoclar Vivadent AG, Schaan, FL, Liechtenstein) was applied and polymerized with QTH for ...

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

      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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    10. Optical coherence tomography for orthodontic aligners

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

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

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

      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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    14. OCT-Based Periodontal Inspection Framework

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

      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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    16. Oral Diagnosis Minimally Invasive Imaging Approaches (Textbook)

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

      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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    18. Early detection of enamel demineralization by optical coherence tomography

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

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

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

      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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    23. 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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    24. 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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