Dentistry -Optical Coherence Tomography News

Articles in category: Dentistry

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1. Detection of early changes in caries lesion using QLF-D and OCT
  
  Explore KoreaMed Synapse Apr 22 2014 Dentistry
  
  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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  Mentions: Yonsei University
2. Assessment of early occlusal caries pre- and post- sealant application—An imaging approach
  
  Explore Wiley Online Library Apr 15 2014 Dentistry
  
  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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  Mentions: University of Michigan Zhongping Chen UC Irvine
3. UCSF Receives NIH Grant for Selective Ablation of Dental Caries and Composites
  
  Explore Optical Coherence Tomography News Apr 10 2014 Dentistry , Funding
  
  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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  Mentions: National Institutes of Health Daniel S. Fried UCSF
4. Nondestructive observation of teeth post core space using optical coherence tomography: a pilot study
  
  Explore SPIE | Journal Apr 10 2014 Dentistry
  
  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
5. Dental imaging using laminar optical tomography and micro CT
  
  Explore Conference Proceedings Mar 2 2014 Dentistry
  
  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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6. High contrast optical imaging methods for image guided laser ablation of dental caries lesions
  
  Explore Conference Proceedings Feb 25 2014 Dentistry
  
  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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  Mentions: Cynthia L. Darling Daniel S. Fried UCSF
7. Monitoring the inhibition of erosion by a CO2 laser with OCT
  
  Explore Conference Proceedings Feb 25 2014 Dentistry
  
  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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  Mentions: Daniel S. Fried UCSF Kenneth H. Chan
8. Integral ceramic superstructure evaluation using time domain optical coherence tomography
  
  Explore Conference Proceedings Feb 25 2014 Dentistry
  
  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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  Mentions: Adrian G. Podoleanu University of Kent Cosmin Sinescu
9. Automated detection of remineralization in simulated enamel lesions with PS-OCT
  
  Explore Conference Proceedings Feb 22 2014 Dentistry
  
  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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  Mentions: Cynthia L. Darling Daniel S. Fried Peter Rechmann
10. Enhancing the detection of hidden occlusal caries lesions with OCT using high index liquids
  
  Explore Conference Proceedings Feb 22 2014 Dentistry
  
  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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  Mentions: Cynthia L. Darling Daniel S. Fried Peter Rechmann
11. Longitudinal monitoring of demineralization peripheral to orthodontic brackets using cross polarization optical coherence tomography
  
  Explore ScienceDirect Feb 20 2014 Dentistry
  
  Objectives The aim of this study was to test the hypothesis that cross-polarization optical coherence tomography (CP-OCT) can be used to longitudinally monitor demineralization peripheral to orthodontic brackets in an extended clinical study. Methods A high-speed CP-OCT system was used to acquire 3D volumetric images of the area at the base of orthodontic brackets over a period of 12-months after placement. The reflectivity was measured at 3-month intervals for 12-months to determine if there was increased demineralization. Two teeth were monitored on twenty test subjects and the brackets were bonded using two types of adhesives This was a randomized controlled ...
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  Mentions: Cynthia L. Darling Daniel S. Fried UCSF
12. Characterization of transparent dentin in attrited teeth using optical coherence tomography
  
  Explore Home - Springer Feb 18 2014 Dentistry
  
  Attrition and wear of tooth surface occur with aging and result in loss of enamel, with exposure and histological changes in dentin. Dealing with attrited teeth and restoration of the lost tissue are clinically challenging. The main objective of this study is to characterize the exposed transparent dentin in the occlusal surface of attrited teeth by optical coherence tomography (OCT). Naturally attrited, extracted human teeth with occlusal-transparent dentin were investigated in comparison to sound and carious teeth. The teeth were subjected to OCT imaging and then cross-sectioned and polished. OCT B-scans were compared to light microscopy images of the same ...
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  Mentions: Yasunori Sumi Tokyo Medical & Dental University National Center for Geriatrics and Gerontology in Japan
13. Zirconia enriched dental adhesive: A solution for OCT contrast enhancement. Demonstrative study by synchrotron radiation microtomography
  
  Explore ScienceDirect Feb 18 2014 Dentistry
  
  Objective The major aim of this study was to prove the capability of the optical coherence tomography (OCT) method in visualizing the integrity of the adhesive fillings and of the interfaces between the adhesive, tooth structures and composite resin. As zirconium dioxide was added to the composition of the adhesive layer in order to strengthen the backscattered light in the OCT investigation, for a better visualization of the interfaces, the determination of a proper zirconia concentration was another aim of our study. Method Several class II cavities were prepared in human premolars and were filled with dental adhesive containing different ...
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  Mentions: Adrian G. Podoleanu University of Kent Cosmin Sinescu
14. Optical coherence tomography examination of the effect of S-PRG filler extraction solution on the demineralization of bovine ename
  
  Explore jstage.jst.go.jp Feb 6 2014 Dentistry
  
  The purpose of this study was to determine the effect of PRG filler extraction solution on the demineralization of enamel using optical coherence tomography (OCT). Bovine enamel was treated with lactic acid buffer solution and then placed in artificial saliva (De group). In the second group, specimens were stored in PRG filler extraction solution followed by immersion in lactic acid buffer solution (PRG group). In the control group, specimens were simply stored in artificial saliva. From the OCT image, the peak intensity (dB) and width at (1/e 2 ) were obtained, and the integrated value was calculated. The data were ...
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15. The Role of Novel Biophotonic Technique in Characterization of the Newly Developed Nanotechnology based Dental Composites (Thesis)
  
  Explore Optical Coherence Tomography News Feb 3 2014 Dentistry , Student Theses
  
  [Background and Objective]: Polymerization shrinkage and the associated contraction stresses are the major shortcoming of dental composites in dentistry, which may affect the bonding performance and result in gap formation at the tooth-restoration interface. Non-destructive assessment and monitoring of these defects are critically important. The aim of this study is to assess the toothrestoration interface and composite adaptation using swept source optical coherence tomography (SS-OCT) in combination of microtensile bond strength (MTBS) and to confirm the findings with confocal laser scanning microscope (CLSM) and scanning electron microscopy (SEM). [Materials and Methods]: Standard round class-I cavities were prepared in human premolar ...
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  Mentions: Turki Bakhsh
16. Measuring Initial Enamel Erosion with Quantitative Light-Induced Fluorescence and Optical Coherence Tomography: An in vitro Validation Study
  
  Explore Karger Publishers Feb 2 2014 Dentistry
  
  Background: Measurement of initial enamel erosion is currently limited to in vitro methods. Optical coherence tomography (OCT) and quantitative light-induced fluorescence (QLF) have been used clinically to study advanced erosion. Little is known about their potential on initial enamel erosion. Objectives: To evaluate the sensitivity of QLF and OCT in detecting initial dental erosion in vitro. Methods: 12 human incisors were embedded in resin except for a window on the buccal surface. Bonding agent was applied to half of the window, creating an exposed and non-exposed area. Baseline measurements were taken with QLF, OCT and surface microhardness. Samples were immersed ...
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  Mentions: Thorlabs Thorlabs OCT Imaging Systems
17. Detection of occlusal caries in primary teeth using swept source optical coherence tomography
  
  Explore SPIE | Journal Jan 30 2014 Dentistry
  
  This study aimed to investigate swept source optical coherence tomography (SS-OCT) as a detecting tool for occlusal caries in primary teeth. At the in vitro part of the study, 38 investigation sites of occlusal fissures (noncavitated and cavitated) were selected from 26 extracted primary teeth and inspected visually using conventional dental equipment by six examiners without any magnification. SS-OCT cross-sectional images at 1330-nm center wavelength were acquired on the same locations. The teeth were then sectioned at the investigation site and directly viewed under a confocal laser scanning microscope (CLSM) by two experienced examiners. The presence and extent of caries ...
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  Mentions: Yasunori Sumi Tokyo Medical & Dental University National Center for Geriatrics and Gerontology in Japan
18. Driving OCT into Dentistry
  
  Explore BioOptics World Jan 22 2014 Dentistry
  
  The first international symposium on optical coherence tomography (OCT) in dentistry highlighted the many advantages of optical diagnostics over current "gold standard" technologies, including improved safety and earlier detection of decay. Stakeholders are now taking steps that will help this modality take root—and eventually improve patient outcomes. Considering the safety concerns associated with x-rays, newer optical diagnostics are particularly valuable in cases where frequent monitoring improves patient outcomes. Dentistry is one such case, and attendees at the first international Symposium on Optical Coherence Tomography (OCT) in Dentistry (June 20–21, 2013; Tokyo, Japan) came away with substantive evidence of ...
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  Mentions: Thorlabs Axsun Technologies Santec
19. Temperature variation in metal ceramic technology analyzed using time domain optical coherence tomography
  
  Explore Conference Proceedings Jan 15 2014 Dentistry
  
  The quality of dental prostheses is essential in providing good quality medical services. The metal ceramic technology applied in dentistry implies ceramic sintering inside the dental oven. Every ceramic material requires a special sintering chart which is recommended by the producer. For a regular dental technician it is very difficult to evaluate if the temperature inside the oven remains the same as it is programmed on the sintering chart. Also, maintaining the calibration in time is an issue for the practitioners. Metal ceramic crowns develop a very accurate pattern for the ceramic layers depending on the temperature variation inside the ...
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  Mentions: Adrian G. Podoleanu University of Kent Cosmin Sinescu
20. Imaging of noncarious cervical lesions by means of a fast swept source optical coherence tomography system
  
  Explore Conference Proceedings Jan 15 2014 Dentistry , Oncology , Otolaryngology
  
  Non-carious cervical lesions (NCCL) are defined as the loss of tooth substance at the cemento-enamel junction and are caused by abrasion, erosion and/or occlusal overload. In this paper we proved that our fast swept source OCT system is a valuable tool to track the evolution of NCCL lesions in time. On several extracted bicuspids, four levels of NCCL were artificially created. After every level of induced lesion, OCT scanning was performed. B scans were acquired and 3D reconstructions were generated. The swept source OCT instrument used in this study has a central wavelength of 1050 nm, a sweeping range ...
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  Mentions: Adrian G. Podoleanu University of Kent Cosmin Sinescu
21. The advantages of a swept source optical coherence tomography system in the evaluation of occlusal disorders
  
  Explore Conference Proceedings Jan 15 2014 Dentistry
  
  Occlusal disorders are characterized by multiple dental and periodontal signs. Some of these are reversible (such as excessive tooth mobility, fremitus, tooth pain, migration of teeth in the absence of periodontitis), some are not (pathological occlusal/incisal wear, abfractions, enamel cracks, tooth fractures, gingival recessions). In this paper we prove the advantages of a fast swept source OCT system in the diagnosis of pathological incisal wear, a key sign of the occlusal disorders. On 15 extracted frontal teeth four levels of pathological incisal wear facets were artificially created. After every level of induced defect, OCT scanning was performed. B scans ...
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  Mentions: Adrian G. Podoleanu University of Kent Cosmin Sinescu
22. Monitoring the remineralization of early simulated lesions using a pH cycling model with CP-OCT
  
  Explore Conference Proceedings Dec 20 2013 Dentistry
  
  If caries lesions are detected early enough they can be arrested by chemical intervention and dietary changes without the need for chemical intervention. Optical coherence tomography is ideally suited to monitor the changes that occur in caries lesions as a result of nonsurgical intervention, since OCT can nondestructively image the internal structure of the lesion. One of the most important changes that occurs in a lesion is preferential deposition of mineral in the outer surface zone. The deposition creates a highly mineralized and weakly scattering surface zone that is clearly visible in OCT images. Since this zone is near the ...
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  Mentions: Cynthia L. Darling Daniel S. Fried Peter Rechmann
23. Use of 2D images of depth and integrated reflectivity to represent the severity of demineralization in cross-polarization optical coherence tomography
  
  Explore Wiley Online Library Dec 7 2013 Dentistry
  
  Several studies have demonstrated the potential of cross-polarization optical coherence tomography (CP-OCT) to quantify the severity of early caries lesions (tooth decay) on tooth surfaces. The purpose of this study is to show that 2D images of the lesion depth and the integrated reflectivity can be used to accurately represent the severity of early lesions. Simulated early lesions of varying severity were produced on tooth samples using simulated lesion models. Methods were developed to convert the 3D CP-OCT images of the samples to 2D images of the lesion depth and lesion integrated reflectivity. Calculated lesion depths from OCT were compared ...
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  Mentions: Cynthia L. Darling Daniel S. Fried UCSF
24. Towards a bimodal proximity sensor for in situ neurovascular bundle detection during dental implant surgery
  
  Explore opticsinfobase.org Dec 2 2013 Dentistry
  
  Proof of concept results are presented towards an in situ bimodal proximity sensor for neurovascular bundle detection during dental implant surgery using combined near infrared absorption (NIR) and optical coherence tomography (OCT) techniques. These modalities are shown to have different sensitivity to the proximity of optical contrast from neurovascular bundles. NIR AC and DC signals from the pulsing of an artery enable qualitative ranging of the bundle in the millimeter range, with best sensitivity around 0.5-3mm distance in a custom phantom setup. OCT provides structural mapping of the neurovascular bundle at sub-millimeter distances in an ex vivo human jaw ...
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