1. Articles from Robert S. Jones

    1-8 of 8
    1. Real-time imaging of anti-biofilm effects using CP-OCT

      Real-time imaging of anti-biofilm effects using CP-OCT

      The objective of this study was to develop a method to reliably and reproducibly assess the physical properties of in vitro multi-species plaque derived biofilms. A custom flow cell (FC) was designed to model oral cavity shear stresses on biofilms grown on hydroxyapatite (HA) discs. A finite-element program (ANSYS 13) modeled flow velocities and wall shear stresses on the interior 3D dimensions. For the experiment, 1% chlorhexidine (CHX), 5 M urea, and a 1× phosphate-buffered saline (PBS) were flown through the FC simulating oral rinsing. Near infrared cross-polarization optical coherence tomography (CP-OCT) non-destructively imaged the fluid immersed biofilms in real ...

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    2. 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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    3. Evaluating a novel fissure caries model using swept source optical coherence tomography

      Evaluating a novel fissure caries model using swept source optical coherence tomography

      The objective of this study was to determine the efficacy of Swept Source Optical Coherence Tomography (SS-OCT) imaging in assessing a novel fissure caries model. Samples were imaged by both near infrared based SS-OCT and high resolution x-ray tomography imaging to non-destructively quantify artificial lesions. The mean relative reflectivities of the demineralized fissures were at least 6 times higher than the corresponding sound fissures ( p <0.02). Importantly, this study demonstrated that SS-OCT reflectivity images can be used to predict the depth of fissure demineralization. Despite correctly evaluating the depth, this work showed that the lesion width calculated from SS-OCT ...

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    4. Assessing near infrared optical properties of ceramic orthodontic brackets using cross‐polarization optical coherence tomography

      Assessing near infrared optical properties of ceramic orthodontic brackets using cross‐polarization optical coherence tomography

      Secondary decay (caries) under ceramic orthodontic brackets remains a significant dental problem and near infrared cross-polarization optical coherence tomography (CP-OCT) has the potential to detect underlying demineralization. The purpose of this study was to determine the effect of crystalline structure and chemical composition of ceramic brackets on CP-OCT imaging. Four ceramic brackets types, which were divided into monocrystalline and polycrystalline, were examined using CP-OCT. The results of this study demonstrated that the crystallinity of the ceramic brackets affected the 1310 nm CP-OCT imaging with the greatest attenuation seen in polycrystalline alumina brackets. The alumina polycrystalline bracket materials had significantly higher ...

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    5. Comparing potential early caries assessment methods for teledentistry

      Comparing potential early caries assessment methods for teledentistry

      BACKGROUND: Optical caries detection has the potential to be incorporated in telehealth medicine for preventive dental screening. The objective of this study was to evaluate and compare visible and near infrared detection methods for identifying early non-cavitated ex vivo occlusal demineralization. METHODS: Six blinded examiners were used to compare the accuracy of the following three examinations in detecting occlusal demineralization: Midwest Caries IDTM (MID), visual photographic examination (CAM) and Cross Polarization Optical Coherence Tomography (CP-OCT). For each diagnostic method, two examiners assessed the extracted tooth samples 1--2 weeks apart. Teeth were then sectioned and lesion depth was confirmed (n = 42 ...

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    6. Influence of dental resin material composition on cross-polarization-optical coherence tomography imaging

      Influence of dental resin material composition on cross-polarization-optical coherence tomography imaging
      The purpose of this study was to investigate cross-polarization-optical coherence tomography (CP-OCT) signal attenuation through different resin material compositions. Four distinct composite systems were used: Filtek supreme ultra (FSU) (3M ESPE), IPS empress direct (EMD) (Ivoclar Vivadent), estelite sigma quick (SQK) (Tokuyama Dental), and Z100 (3M ESPE). Cross-sectional images of different composite-demineralized phantoms ( n = 108 ) were collected using a 1310-nm intraoral cross-polarization swept source OCT (CP-OCT) imaging system. % T quantified the CP-OCT signal attenuation. Scanning electron microscopy, transmission electron microscopy, and energy-dispersive x-ray spectrometer chemical analysis was utilized to determine how different matrix/filler compositions affected attenuation of the near ...
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    7. Imaging in vivo secondary caries and ex vivo dental biofilms using cross-polarization optical coherence tomography

      Imaging in vivo secondary caries and ex vivo dental biofilms using cross-polarization optical coherence tomography

      Objective Conventional diagnostic methods frequently detect only late stage enamel demineralization under composite resin restorations. The objective of this study is to examine the subsurface tooth–composite interface and to assess for the presence of secondary caries in pediatric patients using a novel Optical Coherence Tomography System with an intraoral probe. Methods A newly designed intraoral cross polarization swept source optical coherence tomography (CP-OCT) imaging system was used to examine the integrity of the enamel–composite interfaces in vivo. Twenty-two pediatric subjects were recruited with either recently placed or long standing composite restorations in their primary teeth. To better understand ...

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    8. Feature Of The Week 4/15/12: Assessing Ex Vivo Dental Biofilms with Cross-Polarization Optical Coherence Tomography

      Feature Of The Week 4/15/12: Assessing Ex Vivo Dental Biofilms with Cross-Polarization Optical Coherence Tomography

      A cross-polarization 1310-nm optical coherence tomography system (CP-OCT), using a beam splitter based design, was used to assess ex vivo growth of complex multi-species dental biofilms. These biofilm microcosms were derived from plaque samples along the interface of composite or amalgam restoration in children with a history of early childhood caries. This paper presents a method of measuring the mean biofilm height of mature biofilms using CP-OCT. For our in vivo application, the novel swept source based CP-OCT intraoral probe (Santec Co. Komaki, Japan) dimensions and system image acquisition speed (20 image frames/second) allowed imaging pediatric subjects as young ...

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    1-8 of 8
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    1. (7 articles) University of Minnesota
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    Feature Of The Week 4/15/12: Assessing Ex Vivo Dental Biofilms with Cross-Polarization Optical Coherence Tomography Imaging in vivo secondary caries and ex vivo dental biofilms using cross-polarization optical coherence tomography Influence of dental resin material composition on cross-polarization-optical coherence tomography imaging Comparing potential early caries assessment methods for teledentistry Assessing near infrared optical properties of ceramic orthodontic brackets using cross‐polarization optical coherence tomography Evaluating a novel fissure caries model using swept source optical coherence tomography Clinical cross-polarization optical coherence tomography assessment of subsurface enamel below dental resin composite restorations Real-time imaging of anti-biofilm effects using CP-OCT Macular and choroidal perfusion using optical coherence tomography angiography in type-2 diabetic patients without diabetic retinopathy Short-term evaluation of clear corneal incision after phacoemulsification using anterior segment optical coherence tomography Evaluation of the central vault following implantable phakic contact lens and its correlation to horizontal white to white corneal diameter by anterior segment optical coherence tomography Automatic bifurcation detection utilizing pullback characteristics of bifurcation in intravascular optical coherence tomography