1. Articles in category: Dentistry

    1-24 of 574 1 2 3 4 ... 22 23 24 »
    1. Dependency of hydration and growth conditions on the mechanical properties of oral biofilms

      Dependency of hydration and growth conditions on the mechanical properties of oral biofilms

      Within the oral cavity, dental biofilms experience dynamic environments, in part due to changes in dietary content, frequency of intake and health conditions. This can impact bacterial diversity and morpho-mechanical properties. While phenotypic properties of oral biofilms are closely related to their composition, these can readily change according to dynamic variations in the growth environment and nutrient availability. Understanding the interlink between phenotypic properties, variable growth conditions, and community characterization is an essential requirement to develop structure–property relationships in oral-biofilms. In this study, the impact of two distinct growth media types with increasing richness on the properties of oral ...

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    2. OPTICAL COHERENCE TOMOGRAPHY FOR THE DETECTION AND CHARACTERIZATION OF SUBGINGIVAL ROOT CARIES LESIONS AND NONCARIOUS CERVICAL LESIONS: A QUANTITATIVE ANALYSIS

      OPTICAL COHERENCE TOMOGRAPHY FOR THE DETECTION AND CHARACTERIZATION OF SUBGINGIVAL ROOT CARIES LESIONS AND NONCARIOUS CERVICAL LESIONS: A QUANTITATIVE ANALYSIS

      OBJECTIVE(S) To evaluate the potential of spectral domain optical coherence tomography (SD-OCT) as a tool for detecting subgingival cervical lesions and to characterize 2 different types of cervical lesions—noncarious cervical lesion (NCCL) and root caries lesion (RC)—based on tissue properties using signal intensity (SI). STUDY DESIGN A total of 30 human extracted teeth were collected: teeth with no cervical lesion (n = 10), RC (n = 10), and NCCL (n = 10). Micro-CT imaging was performed as the gold standard to confirm the status of the teeth in each group. In order to examine the efficacy of SD-OCT in the ...

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    3. Dentin anti-demineralization potential of surface reaction-type pre-reacted glass-ionomer filler containing self-adhesive resin cement

      Dentin anti-demineralization potential of surface reaction-type pre-reacted glass-ionomer filler containing self-adhesive resin cement

      Objective To investigate the anti-demineralization potential of a newly developed surface reaction-type pre-reacted glass-ionomer (S-PRG) filler containing self-adhesive resin cement against acidic attacks on the dentin surface. Materials and methods A total of 32 bovine teeth were used. Cavities were prepared on crown dentin slaps and filled with three self-adhesive resin cement: (1) S-PRG-based cement, (2) Si-based cement, and (3) RelyX cement. Specimens were then subjected to pH cycling for 28 days, and the depth of demineralization was assessed using swept-source optical coherence tomography (SS-OCT) after 7, 14, 21, and 28 days. Sixty-four root dentin blocks were divided into four ...

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    4. Advanced imaging of dentin microstructure

      Advanced imaging of dentin microstructure

      This study aimed to demonstrate the feasibility of using optical coherence tomography (OCT) for locating the sectioning site of a specimen before characterizing the ultrastructural features of dentin surfaces as well as the inner wall of the dentinal tubules (DT) using a field emission scanning electron microscope (FESEM). Eight sound human molar teeth were extracted, examined via cross-polarization optical coherence tomography (CP-OCT), embedded, and hemisectioned using a low-speed diamond sawing machine. Next, each sectioned surface was further trimmed, polished, and examined under a confocal laser scanning microscope (CLSM) to locate the target area on the superficial dentin. Subsequently, each section ...

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    5. Non-Invasive Optical Coherence Tomography Data-Based Quantitative Algorithm for the Assessment of Residual Adhesive on Bracket-Removed Dental Surface

      Non-Invasive Optical Coherence Tomography Data-Based Quantitative Algorithm for the Assessment of Residual Adhesive on Bracket-Removed Dental Surface

      The aim of this study was to quantitatively assess the residual adhesive on orthodontic ceramic bracket-removed dental surface. In orthodontic process, ceramic bracket was repeated debonding physically, then the adhesive remained on the dental surface. The residual adhesive caused a lack of adhesive strength between dental and ceramic bracket. Since commonly used adhesive in orthodontics is translucent, residual adhesive is hard to be detected with conventional microscopes. Therefore, 1310 nm center wavelength swept-source OCT system based on laboratory customized image processing algorithm was used for the precise detection of residual adhesive on tooth surface. The algorithm separates residual adhesive from ...

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    6. Optimization of X-ray Investigations in Dentistry Using Optical Coherence Tomography

      Optimization of X-ray Investigations in Dentistry Using Optical Coherence Tomography

      The most common imaging technique for dental diagnoses and treatment monitoring is X-ray imaging, which evolved from the first intraoral radiographs to high-quality three-dimensional (3D) Cone Beam Computed Tomography (CBCT). Other imaging techniques have shown potential, such as Optical Coherence Tomography (OCT). We have recently reported on the boundaries of these two types of techniques, regarding. the dental fields where each one is more appropriate or where they should be both used. The aim of the present study is to explore the unique capabilities of the OCT technique to optimize X-ray units imaging (i.e., in terms of image resolution ...

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    7. En‑face optical coherence tomography analysis of gold and silver nanoparticles in endodontic irrigating solutions: An in vitro study

      En‑face optical coherence tomography analysis of gold and silver nanoparticles in endodontic irrigating solutions: An in vitro study

      Optical coherence tomography (OCT) is a non‑invasive, non‑radioactive optical diagnostic method based on low‑coherence interferometry, which achieves images with different orientation. In dentistry, its major advantage is represented by the localization and characterization of the smallest defects in hard dental tissues, dental materials and of the smallest details in dental anatomy (supplementary canals, recesses, isthmuses, or intra‑radicular connections). The aim of the present in vitro study was to evaluate using c‑scan en‑face optical coherence tomography, the optical opacity, and the distribution inside the root canal lumen of several extracted human teeth of silver and ...

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    8. Assessment of the preventive effects of Nd:YAG laser associated with fluoride on enamel caries using optical coherence tomography and FTIR spectroscopy

      Assessment of the preventive effects of Nd:YAG laser associated with fluoride on enamel caries using optical coherence tomography and FTIR spectroscopy

      Objective This in vitro study characterized and monitored, by Optical Coherence Tomography (OCT) and Fourier Transformed Infrared Spectroscopy (FTIR), the effects of the association of acidulated phosphate fluoride gel (APF-gel) and Nd:YAG (neodymiun:yttrium-aluminum-garnet) laser, as sequencial treatments, in the prevention of incipient enamel caries lesions. Methods 120 human enamel samples were randomized into 3 groups (n = 40): APF-gel (1.23% F - , 4 min.); Laser+APF (Nd:YAG laser irradiation—0.6W, 84.9J/cm 2 , 10Hz, followed by APF-gel); and APF+Laser (APF-gel followed by laser irradiation). The samples were subjected to a 15-day pH-cycling, evaluated by OCT ...

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      Mentions: Thorlabs
    9. Prevention of acidic attack on tooth enamel surfaces using polishing paste containing ion-releasing filler

      Prevention of acidic attack on tooth enamel surfaces using polishing paste containing ion-releasing filler

      The purpose of this study was to investigate the ability of polishing paste containing surface pre-reacted glass-ionomer (S-PRG) filler to prevent acidic attack on tooth enamel surfaces. Resin composites were filled in the standardized cavities and finished with silicon carbide paper. These specimens were divided into three groups: the unpolished “control” group, the “PRG” group polished with S-PRG paste, and the “DDP” group polished with diamond-containing polishing paste. Following polishing, the specimens were immersed in a lactic acid buffer solution for 28 days. Optical coherence tomography (OCT) signals were measured to obtain the signal intensity and width at 1/e ...

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    10. Unsaturated fatty acid salts remove biofilms on dentures

      Unsaturated fatty acid salts remove biofilms on dentures

      Candidiasis-causing Candida sp. forms biofilms with various oral bacteria in the dentures of the elderly, making it harder to kill and remove the microorganism due to the extracellular polymeric substances. We found that biofilms on dentures can effectively be removed by immersion in an unsaturated fatty acid salt solution. Using optical coherence tomography to observe the progression of biofilm removal by the fatty acid salt solution, we were able to determine that the removal was accompanied by the production of gaps at the interface between the biofilm and denture resin. Furthermore, microstructural electron microscopy observations and time-of-flight secondary ion mass ...

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    11. Nondestructive evaluation of microleakage in restored primary teeth using CP-OCT

      Nondestructive evaluation of microleakage in restored primary teeth using CP-OCT

      Background: Although the demand for esthetic filling of primary teeth with resin composite is increasing, there is no enough data on the adhesive performance of composite restorations in primary teeth. Despite the improvements in resin composites, interfacial gap is still a disadvantage as it may cause marginal staining, secondary caries, and restoration failure. Previous studies have validated the efficiency of optical coherence tomography (OCT) in the evaluation of adhesive interface in permanent teeth, but not in primary teeth. Aims: The aim of this study was to assess microleakage upon composite restorations in primary teeth using cross-polarization OCT (CP-OCT). Methodology: Cylindrical ...

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    12. Cross-Polarization Optical Coherence Tomographic Assessment of In situ Simulated Erosive Tooth Wear

      Cross-Polarization Optical Coherence Tomographic Assessment of In situ Simulated Erosive Tooth Wear

      This clinical study tested cross-polarization optical coherence tomography (CP-OCT) monitoring of erosive tooth wear (ETW). Twenty participants completed a 14-day/arm, 3-arm crossover study simulating different ETW severities. Participants received two enamel specimens (per arm) and were randomized to: severe (s-ETW, lemon juice/pH:2.5/4.25%w/v citric acid), moderate (m-ETW, grapefruit juice/pH:3.5/1.03%w/v citric acid), and non-ETW (water). Enamel thickness was measured with CP-OCT (day(D) 0, 7, 14) and micro-computed tomography (μ-CT; D14). Enamel surface loss was determined with CP-OCT and optical profilometry (OP; D7, D14). CP-OCT showed higher ...

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    13. Design of a HNL Index Guiding Silica PCF for SCG: Applications in Dental Optical Coherence Tomography System

      Design of a HNL Index Guiding Silica PCF for SCG: Applications in Dental Optical Coherence Tomography System

      In this manuscript, we present the planning and numerical investigation of SCG (Supercontinuum Generation) on a microstructure HNL-PCF (Highly nonlinear Photonic Crystal Fiber). SiO 2 is the background material for our proposed HNL-PCF where air holes are embedded within the cladding contour to supervise light confinement. The fiber has shown prospective application on dental optical coherence tomography (OCT) by possessing one near-zero dispersion point at operating wavelength 1300 nm. Authors come to the conclusion that wavelengths ranging from 1.3 to 1.5 μm have a better purpose of use in OCT systems. we have used the FEM for numerical ...

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    14. Micron-scale human enamel layer characterization after orthodontic bracket debonding by intensity-based layer segmentation in optical coherence tomography images

      Micron-scale human enamel layer characterization after orthodontic bracket debonding by intensity-based layer segmentation in optical coherence tomography images

      In clinical orthodontic practice, fixed brackets are widely used for tooth movement and adjustments. Although years of research and development have improved the workability of fixed orthodontic brackets, there are still controversies regarding its plausible destructive influence on the enamel surface of tooth. This, in turn, makes the quantitative assessment of the enamel surface after specific orthodontic treatment procedures important in order to opt for the most effective treatment procedure. Through this study, we show the practical applicability of optical coherence tomography (OCT) as a non-ionizing and nondestructive assessment tool for measuring enamel loss after each step of orthodontic bracket ...

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    15. Disease activation maps for subgingival dental calculus identification based on intelligent dental optical coherence tomography

      Disease activation maps for subgingival dental calculus identification based on intelligent dental optical coherence tomography

      During the treatment of periodontitis, removal of dental calculus is essential but still tricky despite developments of several imaging modalities. In this research, we propose a novel approach to provide an intuitive guidance, to automatically detect the present of subgingival calculus, and to identify the site of the lesion in optical coherence tomography images based on convolutional neural network model and the class activation maps technique. Our result shows good visualizations of dental calculus both in B‐scan and in volumetric view. We believe the improvement can break down the technical barrier and finally facilitate the prevalence of dental optical ...

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    16. Comparative evaluation of the spectral-domain optical coherence tomography and microhardness for remineralization of enamel caries lesions

      Comparative evaluation of the spectral-domain optical coherence tomography and microhardness for remineralization of enamel caries lesions

      This study aimed to evaluate the Cirrus high-definition (HD) spectral-domain optical coherence tomography (SD-OCT) for the remineralization of artificial enamel caries and to compare it with the comparison surface microhardness (SMH) analysis. Artificial caries lesions were produced on forty human enamel samples. Then, three different remineralization agents containing casein phosphopeptide amorphous calcium phosphate; casein phosphopeptide amorphous calcium fluoride phosphate; calcium glycerophosphate, magnesium chloride, and xylitol; and remineralization solution (control) were applied with pH cycling for six days. The optical depth of backscattered light and microhardness of enamel were measured using SD-OCT and SMH. All remineralization agents were significantly efficient in ...

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    17. Minimally-invasive diagnostic approaches in periodontics: laser Doppler imaging and optical coherence tomography

      Minimally-invasive diagnostic approaches in periodontics: laser Doppler imaging and optical coherence tomography

      Evaluating the health status of the gingival tissue represents an important objective in the dental daily practice. Inflammation changes the microcirculatory and micromorphological dynamics of human gingiva which cannot always be determined only by current clinical examination methods and which may lead to unpleasant complications if not diagnosed and treated at the right moment. Laser Doppler Flowmetry and Laser Doppler Imaging could be a useful, noninvasive, sensitive, reproducible, and harmless methods for measuring gingival blood flow in humans. Optical Coherence Tomography is a non-invasive method of imaging the dental microstructure and can potentially be used to evaluate periodontal tissues. It ...

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    18. Detection and analyzing plane of non-cavitated approximal caries by cross-polarized optical coherence tomography (CP-OCT)

      Detection and analyzing plane of non-cavitated approximal caries by cross-polarized optical coherence tomography (CP-OCT)

      Objective: The objective was to assess the detection ability and the effect of analyzing plane of CP-OCT for non-cavitated approximal caries. Methods: Thirty human extracted premolars were selected based on micro-computed tomography [μ-CT: μ- CT = 0: sound (n = 12), μ-CT = 1/2: caries into outer-/inner-half of enamel (n = 6 each), μ-CT = 3: caries into outer one-third of dentine (n = 6)]. Teeth were mounted in a custommade device to simulate approximal contact, and scanned from the marginal ridge above the contact area. CP-OCT images were analyzed by deepest caries extension from horizontal and coronal planes, and repeated 48-hrs later. Sensitivity, specificity ...

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    19. Assessment of Demineralization Inhibition Effects of Dentin Desensitizers Using Swept-Source Optical Coherence Tomography

      Assessment of Demineralization Inhibition Effects of Dentin Desensitizers Using Swept-Source Optical Coherence Tomography

      The purpose of this study was to evaluate the mechanism of action and the inhibiting effects of two types of desensitizers against dentin demineralization using pre-demineralized hypersensitivity tooth model in vitro. In this study, we confirmed that a hypersensitivity tooth model from our preliminary experiment could be prepared by immersing dentin discs in an acetic acid-based solution with pH 5.0 for three days. Dentin discs with three days of demineralization were prepared and applied by one of the desensitizers containing calcium fluoro-alumino-silicate glass (Nanoseal, NS) or fluoro-zinc-silicate glass (Caredyne Shield, CS), followed by an additional three days of demineralization ...

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    20. Light-based diagnostic methods for the in vivo assessment of initial caries lesions: Laser fluorescence, QLF and OCT

      Light-based diagnostic methods for the in vivo assessment of initial caries lesions: Laser fluorescence, QLF and OCT

      Objectives To evaluate different light-based caries diagnostic methods for assessment of non-cavitated initial carious lesions on smooth surfaces. Methods 39 participants were included. For each participant, three regions of interest (ROI) with ICDAS codes 0, 1 or 2 were defined. All ROIs (n = 117) were investigated/imaged with laser fluorescence (LF, DIAGNOdent 2095; KaVo dental GmbH), quantitative light-induced fluorescence (QLF; Biluminator 2+, Inspektor Research Systems B.V.) and spectral-domain optical coherence tomography (SD-OCT; Telesto II, Thorlabs GmbH). The values of LF, ΔF of QLF, and the lesion extent assessed by OCT were categorized. Frequency distribution of LF-/QLF- and OCT-scores ...

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      Mentions: Thorlabs
    21. TO STUDY THE EFFECT OF DEMINERALISATION OF ENAMEL ON DEPTH OF LIGHT PENETRATION USING OPTICAL COHERENCE TOMOGRAPHY

      TO STUDY THE EFFECT OF DEMINERALISATION OF ENAMEL ON DEPTH OF LIGHT PENETRATION USING OPTICAL COHERENCE TOMOGRAPHY

      The aim of this research was to study the application of Optical coherence tomography (OCT) which could provide the early, chair-side detection of caries and therefore initiate the prompt treatment strategies required. Six extracted teeth were selected with no visible carious lesion. All teeth were scanned using X-ray Microtomography (XMT). Short term demineralization was performed in acetic acid (pH) to determine whether Optical Coherence Tomography (OCT) could differentiate between light penetration in mineralized and non-mineralized enamel. Scattering Attenuation Microscopy (SAM) software was used to analyze the depth of penetration.

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    22. A Novel Evaluation Method for Detecting Defects of the Bonded Orthodontic Bracket-Tooth Interface

      A Novel Evaluation Method for Detecting Defects of the Bonded Orthodontic Bracket-Tooth Interface

      Background . Orthodontic patients are at high risk to develop caries. This study is introducing a clinical method detecting interfacial defects between ceramic brackets and enamel utilizing optical coherent tomography in addition to using the nanoleakage expression in vitro test. Methods . Transbond XT primer and moisture insensitive primer (MIP) were bonded to 75 human premolar enamel surfaces and divided into (XTD), (MIPD), and (MIPW) groups. The (XTD) and (MIPD) groups had ceramic brackets bonded to dry enamel surfaces using TransBond and moisture insensitive primers, respectively, while the (MIPW) samples were bonded to moist enamel using moisture insensitive primer. All specimens were ...

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      Mentions: Santec
    23. Assessment of composite leakage using optical coherence tomography: A systematic review

      Assessment of composite leakage using optical coherence tomography: A systematic review

      Background Leakage under dental restorations is problematic because it allows bacterial percolation and can cause a failure of dental restorations. Assessing microleakage and nanoleakage is one of the main topics of research regarding operative dentistry. Objective This review compares the assessment methods of composite leakage using optical coherence tomography. Results Optical coherence tomography (OCT) is useful in evaluating the internal adaptation of composite resin restoration and in quantifying resin–dentin interfacial gaps. The sealing performance of resin cementation before and after thermal cycling and monitoring of cariogenic demineralization at the enamel–composite interface was also attempted. OCT is still uncommon ...

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    24. https://doi.org/10.1002/14651858.CD013855

      https://doi.org/10.1002/14651858.CD013855

      Background: Caries is one of the most prevalent and preventable conditions worldwide. If identified early enough then non-invasive techniques can be applied, and therefore this review focusses on early caries involving the enamel surface of the tooth. The cornerstone of caries detection and diagnosis is a visual and tactile dental examination, although alternative approaches are available. These include illumination-based devices that could potentially support the dental examination. There are three categories of illumination devices that exploit various methods of application and interpretation, each primarily defined by different wavelengths, optical coherence tomography (OCT), near-infrared (NIR), and fibre-optic technology, which incorporates more ...

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