1. Articles in category: Dentistry

    1-24 of 322 1 2 3 4 ... 12 13 14 »
    1. Viewing Dentistry in a New Light

      Viewing Dentistry in a New Light

      Dental X-rays expose patients to radiation, require time to process, and can only “see” a limited amount inside the mouth. Now new optical techniques developed by UC San Francisco’s Daniel Fried , PhD, use light to take instantaneous digital images that can provide a better picture of our teeth and could one day zap cavities with pinpoint precision. Daniel Fried, PhD, speaks with Leon Chung, a dental research fellow in his lab. Photo by Susan Merrell Fried, a professor in the School of Dentistry’s Division of Biomaterials and Bioengineering in the Department of Preventive and Restorative Dental Sciences, is ...

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    2. Optical Coherence Tomography & Dentistry

      Optical Coherence Tomography & Dentistry

      In dentistry, optical coherence tomography (OCT), a type of digital imaging, is used to support patient diagnosis, treatment planning, and education. Providing a localized image in a real-time setting, this technique can be used to detect caries, support the diagnosis of periodontal diseases, indicate tooth fractures, evaluate the margins of oral lesions, and measure cavity preparations for restorations created by computer-aided design/computer-aided manufacturing (CAD/CAM) technology. OCT was developed into a cross-sectional imaging modality in medicine by Huang et al 1 in 1991. The imaging technique was first applied in ophthalmology with a focus on the retina, optic nerve ...

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    3. Effectiveness of varnish with CPP–ACP in prevention of caries lesions around orthodontic brackets: an OCT evaluation

      Effectiveness of varnish with CPP–ACP in prevention of caries lesions around orthodontic brackets: an OCT evaluation

      Objective: To evaluate the in vitro efficiency of applying varnish containing casein phosphopeptide (CPP) and amorphous calcium phosphate (ACP) in prevention of caries lesions around orthodontic brackets. Materials and methods: For this purpose, brackets were bonded to the vestibular surface of bovine incisors, and eight groups were formed ( n = 15) according to exposure of oral hygiene substances and enamel varnish: 1 (control) brushing only performed, 2 (control) brushing + use of mouth wash with fluoride, 3 Duraphat varnish application only (Colgate-Palmolive Ind. E Com. Ltda, São Paulo, SP, Brazil), 4 Duraphat + brushing, 5 Duraphat + brushing + mouth wash, 6 MI Varnish ...

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    4. PhD position in Dental Optical Coherence Tomography Department of Odontology at University of Copenhagen.

      PhD position in Dental Optical Coherence Tomography Department of Odontology at University of Copenhagen.

      PhD fellowship in dental optical coherence tomography - Department of Odontology Applications are invited for a PhD Fellowship at the Department of Odontology, Faculty of Health and Medical Sciences, University of Copenhagen. The candidate will work in the area of digital dental scanning with focus on optical coherence tomography (OCT). The position is for a 3-year period and will commence on 1 September 2014 or as soon as possible thereafter. Project description The project is part of a research programme between industry, Technical University of Denmark (DTU) and Department of Odontology, University of Copenhagen. The objective of the project is to ...

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    5. Material Defects in Ceramic Crowns Identification by Optical Coherence Tomography and MicroCT

      Material Defects in Ceramic Crowns Identification by Optical Coherence Tomography and MicroCT

      Full ceramic crowns are considered revolutionary in developing the concept of aesthetic dentistry. Appreciate their aesthetic appearance particularly raise the cost prices, they do not ensure the risk of fractures and cracks which sometimes face the clinician after their insertion directly into the mouth. As a result of the fracture may occur between disputes team dentist-dental technician. The purpose of this study was to identify flaws of material included in the pottery table analyzing the full ceramic crowns using non-invasive technologies. As materials we use 25 full ceramic crowns (e. max, IVOCLAR) obtained through the technology of pressing were used ...

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    6. Examination of ceramic/enamel interfacial debonding using acoustic emission and optical coherence tomography

      Examination of ceramic/enamel interfacial debonding using acoustic emission and optical coherence tomography

      Objective This study investigates monitored micro-crack growth and damage in the ceramic/enamel adhesive interface using the acoustic emission (AE) technique with optical coherence tomography (OCT) under fatigue shear testing. Methods Shear bond strength (SBS) was measured first with eight prepared ceramic/enamel adhesive specimens under static loads. The fatigue shear testing was performed with three specimens at each cyclic load according to a modified ISO14801 method, applying at 80%, 75%, 70%, and 65% of the SBS to monitor interface debonding. The number of cycles at each load was recorded until ceramic/enamel adhesive interface debonding occurred. The AE technique ...

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    7. Sealing performance of resin cements before and after thermal cycling: Evaluation by optical coherence tomography

      Sealing performance of resin cements before and after thermal cycling: Evaluation by optical coherence tomography

      Objectives Self-adhesive resin cements have been recently introduced; however, there is little data available on their long-term performance. In this in vitro study, swept-source optical coherence tomography (OCT) at 1310 nm center wavelength was used for monitoring adaptation of indirect resin restorations after thermal cycling. Methods Resin inlays were luted to class-I cavities of extracted human teeth using three resin cements; Clearfil SA Luting (SA; Kuraray), Bistite II DC or Multibond II (Tokuyama Dental). Each cement was applied with or without pre-coating of dentin by a self-etch adhesive (Clearfil SE Bond) and a low-viscosity microfilled resin. OCT imaging was performed ...

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    8. Application of Optical Coherence Tomography to Identify Pulp Exposure During Access Cavity Preparation Using an Er:YAG Laser

      Application of Optical Coherence Tomography to Identify Pulp Exposure During Access Cavity Preparation Using an Er:YAG Laser

      Objective : The study aimed to evaluate the ability of optical coherence tomography (OCT) to guide and identify pulp exposure using an erbium: yttrium–aluminum–garnet (Er:YAG) laser. Background data: The Er:YAG laser has been proven to be effective in ablating dental hard tissue and offers advantages, as there is none of the vibration and noise you get with conventional methods, but it has limitations in relation to the tactile feedback that would aid in identification of entry into the pulp chamber. Based on depth-resolved optical reflectivity, OCT technology has been developed to provide high-resolution, cross-sectional images of the ...

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    9. Attenuation of near-IR light through dentin at wavelengths from 1300-1650-nm

      Attenuation of near-IR light through dentin at wavelengths from 1300-1650-nm

      Light scattering in dental enamel decreases markedly from the UV to the near-IR and recent studies employing near-IR transillumination and reflectance imaging including optical coherence tomography indicate that this wavelength region is ideally suited for imaging dental caries due to the high transparency of enamel. The opacity of dentin is an important factor in optimizing the contrast of demineralization in reflectance measurements. It also influences the contrast of occlusal lesions in transillumination. Light scattering in dentin is an order of magnitude larger than in enamel, it is highly anisotropic and has a different spectral light scattering dependence than enamel. The ...

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    10. Clinical cross-polarization optical coherence tomography assessment of subsurface enamel below dental resin composite restorations

      Clinical cross-polarization optical coherence tomography assessment of subsurface enamel below dental resin composite restorations

      A newly designed intraoral swept source cross-polarization optical coherence tomography (CP-OCT) imaging system was used to examine the integrity of the subsurface enamel below resin composite restorations placed in primary teeth. CP-OCT analysis was performed using images obtained from resin composite restoration in 62 ( n = 62 ) pediatric subjects. Clinical examination was performed by a single examiner prior to CP-OCT imaging and analysis. CP-OCT images are presented using a unique combined intensity image, where a false color scale is overlaid on the grayscale intensity image. There was a clear difference in the distribution of the mean-backscattered intensity (mR) between restorations recently ...

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    11. Near-IR imaging of demineralization under sealants

      Near-IR imaging of demineralization under sealants

      Previous studies have shown that near-IR reflectance and transillumination imaging can be used to acquire high contrast images of early caries lesions and composite restorative materials. The aim of the study was to determine the optimum near-IR wavelengths for imaging demineralized areas under dental sealants. Fifteen natural human premolars and molars with occlusal lesions were used in this in vitro study. Images before and after application of sealants were acquired using near-IR reflectance and near-IR transillumination at wavelengths of 1300 nm, 1460 nm, and 1500 - 1700 nm. Images were also acquired using polarization sensitive optical coherence tomography for comparison. The ...

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    12. Near-IR imaging of cracks in teeth

      Near-IR imaging of cracks in teeth

      Dental enamel is highly transparent at near-IR wavelengths and several studies have shown that these wavelengths are well suited for optical transillumination for the detection and imaging of tooth decay. We hypothesize that these wavelengths are also well suited for imaging cracks in teeth. Extracted teeth with suspected cracks were imaged at several wavelengths in the near-IR from 1300-1700-nm. Extracted teeth were also examined with optical coherence tomography to confirm the existence of suspected cracks. Several teeth of volunteers were also imaged in vivo at 1300-nm to demonstrate clinical potential. In addition we induced cracks in teeth using a carbon ...

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    13. Evaluation of the marginal fit at implant–abutment interface by optical coherence tomography

      Evaluation of the marginal fit at implant–abutment interface by optical coherence tomography

      Vertical misfit of implant–abutment interface can affect the success of implant treatment; however, currently available modalities have limitations to detect these gaps. This study aimed to evaluate implant–abutment gaps in vitro using optical coherence tomography (OCT). Vertical misfit gaps sized 50, 100, 150, or 200 μ m were created between external hexagonal implants and titanium abutments (Nobel Biocare, Göteborg, Sweden). A porcine gingival tissue slice, 0.5, 1.0, 1.5, or 2.0 mm in thickness, was placed on each implant–abutment interface. The gaps were evaluated by swept-source OCT at a center wavelength of 1330 nm ...

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    14. An Update on Optical Coherence Tomography in Dentistry

      An Update on Optical Coherence Tomography in Dentistry

      An update and overview of the use of optical coherence tomography (OCT) in dentistry is described. Specific aspects discussed include the evolution of the technology and the basic process of light beam interference used to obtain OCT images. In addition, aspects of the optical properties of dentine and enamel and the range of current diagnostic applications of OCT in dentistry are reviewed. Clinical Relevance: The technique of optical coherence tomography is considered to be significant since the technology involved allows imaging using light to around 2-3 mm in teeth and can, for example, allow the extent and progression of carious ...

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    15. Detection of early changes in caries lesion using QLF-D and OCT

      Detection of early changes in caries lesion using QLF-D and OCT

      Objectives We aimed to compare the differences in caries lesion changes when measured by QLF-D as fluorescence loss and by SS-OCT as lesion depth with respect to demineralized time, during formation of artificial early caries lesion. We also demonstrated that QLF-D and SS-OCT can be used effectively in monitoring the longitudinal progression of simulated caries lesions. Methods Ten bovine incisors were sectioned (5×4 mm) and embedded in epoxy resin. An acid-resistant nail varnish was applied to a part of the tooth surfaces to protect sound enamel (2×4 mm). To generate lesions, each specimen was immersed in 40 ml ...

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    16. Assessment of early occlusal caries pre- and post- sealant application—An imaging approach

      Assessment of early occlusal caries pre- and post- sealant application—An imaging approach

      Background and Objective Clinicians have difficulty assessing and monitoring early occlusal caries. Traditional clinical exam and radiographs are unable to detect the subtle alterations in enamel indicative of de- or re-mineralization, particularly under dental sealants. Although clinicians have used laser fluorescence (LF) to address this gap, this modality has demonstrated weak correlation with histology. The International Caries Detection and Assessment System (ICDAS-II) has demonstrated high sensitivity and specificity for caries detection, but since it is based on visual assessment, it is of no use in areas beneath the most commonly used dental sealants which are opaque. Optical coherence tomography (OCT ...

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    17. UCSF Receives NIH Grant for Selective Ablation of Dental Caries and Composites

      UCSF Receives NIH Grant for Selective Ablation of Dental Caries and Composites

      The University of California at San Francisco received a 2014 NIH Grant for $394,375 for Selective Ablation of Dental Caries and Composites. The principal investigator is Daniel Fried. The program began in 2009 and ends in 2018. below is a summary of the proposed work. The overall objective of this proposed research is to increase our fundamental understanding of the interaction of high intensity laser radiation with dental hard tissues and apply that knowledge to the development of laser based methods that selectively remove dental caries and composite restorative materials using an integrated approach of computer-controlled laser beam scanning ...

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    18. Nondestructive observation of teeth post core space using optical coherence tomography: a pilot study

      Nondestructive observation of teeth post core space using optical coherence tomography: a pilot study

      Coronal tooth lesions, such as caries, enamel cracking, and composite resin restoration cavities, have been observed by optical coherence tomography (OCT). This pilot study was performed to verify whether OCT could reveal details of root canals filled with resin core build-up. A dual-cure, one-step, self-etch adhesive system-bonding agent (Clearfil Bond SE ONE, Kuraray Noritake Dental) and dual-cure resin composite core material (Clearfil DC Core Automix ONE, Kuraray Noritake Dental) were used according to the manufacturer’s instructions in root canals. OCT was performed at three stages of the core build-up: after the post space preparation, after bonding application, and after ...

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      Mentions: Osaka University
    19. Dental imaging using laminar optical tomography and micro CT

      Dental imaging using laminar optical tomography and micro CT

      Dental lesions located in the pulp are quite difficult to identify based on anatomical contrast, and, hence, to diagnose using traditional imaging methods such as dental CT. However, such lesions could lead to functional and/or molecular optical contrast. Herein, we report on the preliminary investigation of using Laminar Optical Tomography (LOT) to image the pulp and root canals in teeth. LOT is a non-contact, high resolution, molecular and functional mesoscopic optical imaging modality. To investigate the potential of LOT for dental imaging, we injected an optical dye into ex vivo teeth samples and imaged them using LOT and micro-CT ...

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    20. High contrast optical imaging methods for image guided laser ablation of dental caries lesions

      High contrast optical imaging methods for image guided laser ablation of dental caries lesions

      Laser based methods are well suited for automation and can be used to selectively remove dental caries to minimize the loss of healthy tissues and render the underlying enamel more resistant to acid dissolution. The purpose of this study was to determine which imaging methods are best suited for image-guided ablation of natural non-cavitated carious lesions on occlusal surfaces. Multiple caries imaging methods were compared including near-IR and visible reflectance and quantitative light fluorescence (QLF). In order for image-guided laser ablation to be feasible, chemical and physical modification of tooth surfaces due to laser irradiation cannot greatly reduce the contrast ...

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    21. Monitoring the inhibition of erosion by a CO2 laser with OCT

      Monitoring the inhibition of erosion by a CO2 laser with OCT

      Since optical coherence tomography (OCT) is well suited for measuring small dimensional changes on tooth surfaces, OCT has great potential for monitoring tooth erosion. Previous studies have shown that enamel areas ablated by a carbon dioxide laser manifested lower rates of erosion compared to the nonablated areas. The purpose of this study was to develop a model to monitor erosion in vitro that could potentially be used in vivo. Teeth surfaces were irradiated with a carbon dioxide laser at low sub-ablative fluence to create an acid-resistant reference layer without damaging the enamel. The laser treated areas were compared with the ...

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    22. Integral ceramic superstructure evaluation using time domain optical coherence tomography

      Integral ceramic superstructure evaluation using time domain optical coherence tomography

      Optical Coherence Tomography (OCT) is a non-invasive low coherence interferometry technique that includes several technologies (and the corresponding devices and components), such as illumination and detection, interferometry, scanning, adaptive optics, microscopy and endoscopy. From its large area of applications, we consider in this paper a critical aspect in dentistry - to be investigated with a Time Domain (TD) OCT system. The clinical situation of an edentulous mandible is considered; it can be solved by inserting 2 to 6 implants. On these implants a mesostructure will be manufactured and on it a superstructure is needed. This superstructure can be integral ceramic; in ...

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    23. Automated detection of remineralization in simulated enamel lesions with PS-OCT

      Automated detection of remineralization in simulated enamel lesions with PS-OCT

      Previous in vitro and in vivo studies have demonstrated that polarization-sensitive optical coherence tomography (PS-OCT) can be used to nondestructively image the subsurface structure and measure the thickness of the highly mineralized transparent surface zone of caries lesions. There are structural differences between active lesions and arrested lesions, and the surface layer thickness may correlate with activity of the lesion. The purpose of this study was to develop a method that can be used to automatically detect and measure the thickness of the transparent surface layer in PS-OCT images. Automated methods of analysis were used to measure the thickness of ...

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    24. Enhancing the detection of hidden occlusal caries lesions with OCT using high index liquids

      Enhancing the detection of hidden occlusal caries lesions with OCT using high index liquids

      In a previous study, we investigated the influence of several high refractive index fluids on the performance of polarization sensitive optical coherence tomography (PS-OCT). That study showed that these liquids can increase the effective imaging depth and lesion contrast. Other in vitro and in vivo studies have shown that OCT can be used to show whether occlusal lesions have penetrated to the dentinal-enamel junction (DEJ) and spread laterally under the enamel. The purpose of this study was to determine if high index fluids can enhance the ability of OCT to detect hidden occlusal lesions and show if these lesions have ...

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    1-24 of 322 1 2 3 4 ... 12 13 14 »
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