1. Articles in category: Dentistry

    1-24 of 552 1 2 3 4 ... 21 22 23 »
    1. 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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    2. 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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    3. Evaluation of microleakage in class-II bulk-fill composite restorations

      Evaluation of microleakage in class-II bulk-fill composite restorations

      Background/purpose Despite the clinical appeal of restoring deep class II cavities in single increment using bulk-fill resin composite, sealing of bulk-filled composite restorations is a concern. This study evaluated interfacial adaptation of bulk-fill composite restoration to axial wall and gingival floor of class II cavities using cross-polarization optical coherence tomography (CP-OCT). Materials and methods Box-shaped class II cavities were prepared in extracted molars and divided into three groups ( n = 7) according to adhesive used; Clearfil SE Bond 2 (SE2), Tetric-N Bond Self-Etch (TSE) or Tetric-N Bond Universal (TNU). All adhesives were applied in self-etch mode and according to manufacturers ...

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    4. Impact of early biofilm on the assessment of initial enamel erosion with swept-source optical coherence tomography

      Impact of early biofilm on the assessment of initial enamel erosion with swept-source optical coherence tomography

      Objective: This study examined the impact of early biofilm on the tooth surface, during the assessment of initial enamel erosion using swept-source optical coherence tomography (SS-OCT). Method and materials: Forty-five enamel windows of 2 × 4 mm2 were prepared on 23 extracted human teeth. The specimens were exposed to citric acid (pH 3.2) for 30 minutes and randomly divided into three groups (n = 15): Group 1, no biofilm; Group 2, 1-day-old biofilm; and Group 3, 3-day-old biofilm. Specimens in Groups 2 and 3 were inoculated with oral bacteria (Streptococcus sanguinis, Streptococcus mitis, and Actinomyces naeslundii) to produce early laboratory-cultivated biofilms ...

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    5. SenEvaluation of Internal Fit and Marginal Adaptation of Provisional Crowns Fabricated with Three Different Techniques

      SenEvaluation of Internal Fit and Marginal Adaptation of Provisional Crowns Fabricated with Three Different Techniques

      Different techniques have been used to construct provisional crowns to protect prepared teeth. The purpose of this in vitro study was to assess the internal fit and marginal discrepancy of provisional crowns made by different methods. A total of 48 provisional crowns were constructed and divided into three groups ( n = 16) according to the fabrication methods: fabricated manually-group MAN; computer-aided design/computer aided manufacturing technology-group CAM; and 3-dimensional (3D)-printed technology-group 3DP. The same standard tessellation language (STL) file was used for both CAD/CAM and 3D-printed group. The silicone-checked method was used to measure the internal gap distance. The ...

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    6. Detection and analysis of early degradation at resin-dentin interface by optical coherence tomography (OCT) and confocal laser scanning microscope (CLSM)

      Detection and analysis of early degradation at resin-dentin interface by optical coherence tomography (OCT) and confocal laser scanning microscope (CLSM)

      Objective To evaluate early degradation at resin-dentin interface using non-invasive swept-source optical coherence tomography (SS-OCT) and confocal laser scanning microscope (CLSM). Methods Self-etch adhesives and resin-composites containing bisphenol-glycidyl-dimethacrylate (Bis-GMA), which is one of the most widely used monomers in restorative materials, were investigated in this study. Forty cervical cavities were prepared in bovine incisors and applied by the adhesive with/without Bis-GMA (AdhesiveBG/Adhesive), filled by the resin with/without Bis-GMA (ResinBG/Resin) and then challenged by cariogenic biofilm (37 °C, 24 h). Gap Formation and dentin demineralization around resin-composites were observed by SS-OCT and CLSM. Results Three types of ...

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    7. Use of spectral domain optical coherence tomography to detect internal defects of resin composites in carious teeth after restorations

      Use of spectral domain optical coherence tomography to detect internal defects of resin composites in carious teeth after restorations

      Postoperative testing plays an important role in evaluating clinical effect of treatment of caries by filling the decayed teeth with resin composites, which mainly depends on the detection of defects at the interface between resin composites and cavity to date, without considering the internal defects of resin composites. Here, we report, for the first time, the measurement of the morphologies within resin composites by using spectral domain optical coherence tomography. Experiments were performed on the ex vivo human carious teeth after restorations, and the results showed that the tiny cracks and air bubbles within resin composites can be clearly distinguished ...

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    8. Automatic intraoral 3D scanner with low coherence ranging

      Automatic intraoral 3D scanner with low coherence ranging

      An intraoral scanning apparatus has a source of low coherence light. An interferometer directs the low coherence light to a reference path and a sample path and generates image data according to interference from combined light returned along the reference and sample paths. A fixture is optically coupled to the sample path and has a bite portion featured for clamping between the jaws of a patient, a track that defines a curved scan path for scanning, one or more scanners configured to direct the sample path light to and from the teeth, and an actuator and translation apparatus that urges ...

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    9. Infrared Imaging Detects Dental Caries in Posterior Teeth

      Infrared Imaging Detects Dental Caries in Posterior Teeth

      Optical coherence tomography (OCT), an imaging method based on infrared radiation, can be used to detect dental caries on the surfaces of posterior teeth, according to Okayama University. As infrared light is non-ionizing, the method is safer than radiography, which involves X-rays, researchers at the university said. Dental caries affects more than 90% of the world’s adult population, the researchers noted, adding that it often is detected too late, requiring invasive treatment. Visual examination and radiography are the main tools for diagnosing caries, though they aren’t completely efficient for detecting caries in posterior teeth, the researchers said. Also ...

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    10. 3D imaging of proximal caries in posterior teeth using optical coherence tomography

      3D imaging of proximal caries in posterior teeth using optical coherence tomography

      Researchers at Okayama University report in Scientific Reports that optical coherence tomography, an imaging method based on infrared radiation, can be used for detecting dental caries on the surface of rear teeth. As infrared light is non-ionizing, the method is safer than radiography, which involves X-rays. Dental caries affects more than 90% of the world’s adult population. And often, dental caries is detected ‘too late’, requiring invasive teeth treatment. Visual examination (by a dentist) and radiography are currently the main tools for diagnosing caries. However, they are not completely efficient for detecting caries in rear teeth (so-called posterior teeth ...

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    11. OCT evaluation of the internal adaptation of ceramic veneers depending on preparation design and ceramic thickness

      OCT evaluation of the internal adaptation of ceramic veneers depending on preparation design and ceramic thickness

      Objectives In-vitro evaluation of the influence of preparation design and thickness of ceramic veneers on the interfacial bond using optical coherence tomography (OCT). Methods Sixty-four central incisors were randomly assigned to four preparation designs differing from no to complete dentine exposure (n = 16 each): non-prep (NP), minimal-invasive (MI, no dentine exposure), semi-invasive (SI, 50% dentine) and invasive (I, 100% dentine). Ceramic veneers (IPS InLine Veneer) of two thicknesses (0.2−0.5 mm (T1) and > 0.5–1.2 mm (T2)) were etched, silanized, and adhesively luted (Optibond FL, Variolink Veneer). After water storage (37 °C, 21d), thermocycling (2000 cycles ...

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    12. Handheld optical coherence tomography for clinical assessment of dental plaque and gingiva

      Handheld optical coherence tomography for clinical assessment of dental plaque and gingiva

      Significance: Optical coherence tomography (OCT) offers high spatial resolution and contrast for imaging intraoral structures, yet few studies have investigated its clinical feasibility for dental plaque and gingiva imaging in vivo. Furthermore, the accessibility is often limited to anterior teeth due to bulky imaging systems and probes. Aim: A custom-designed, handheld probe-based, spectral-domain OCT system with an interchangeable attachment was developed to assess dental plaque and gingival health in a clinical setting. Approach: Healthy volunteers and subjects with gingivitis and sufficient plaque were recruited. The handheld OCT system was operated by trained dental hygienists to acquire images of dental plaque ...

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    13. Dental Diagnosis and Treatment Assessments: Between X-rays Radiography and Optical Coherence Tomography

      Dental Diagnosis and Treatment Assessments: Between X-rays Radiography and Optical Coherence Tomography

      A correct diagnosis in dental medicine is typically provided only after clinical and radiological evaluations. They are also required for treatment assessments. The aim of this study is to establish the boundaries from which a modern, although established, imaging technique, Optical Coherence Tomography (OCT), is more suitable than the common X-ray radiography to assess dental issues and treatments. The most common methods for daily-basis clinical imaging are utilized in this study for extracted teeth (but also for other dental samples and materials), i.e., panoramic, intraoral radiography, and three-dimensional (3D) cone beam computed tomography (CBCT). The advantages of using OCT ...

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    14. Diagnosis of Occlusal Tooth Wear Using 3D Imaging of Optical Coherence Tomography Ex Vivo

      Diagnosis of Occlusal Tooth Wear Using 3D Imaging of Optical Coherence Tomography Ex Vivo

      The aim of this study was to assess the utility of 3D imaging of optical coherence tomography (OCT) for the diagnosis of occlusal tooth wear ex vivo. Sixty-three extracted human molars with or without visible tooth wear were collected to take digital intraoral radiography and 3D OCT images. The degree of tooth wear was evaluated by 12 examiners and scored using 4-rank scale: 1—slight enamel wear; 2—distinct enamel wear; 3—tooth wear with slight dentin exposure; 4—tooth wear with distinct involvement of dentin. The degree of tooth wear was validated by the histological view of confocal laser ...

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    15. An Intraoral OCT Probe to Enhanced Detection of Approximal Carious Lesions and Assessment of Restorations

      An Intraoral OCT Probe to Enhanced Detection of Approximal Carious Lesions and Assessment of Restorations

      Caries, the world’s most common chronic disease, remains a major cause of invasive restorative dental treatment. To take advantage of the diagnostic potential of optical coherence tomography (OCT) in contemporary dental prevention and treatment, an intraorally applicable spectral-domain OCT probe has been developed based on an OCT hand-held scanner equipped with a rigid 90°-optics endoscope. The probe was verified in vitro. In vivo, all tooth surfaces could be imaged with the OCT probe, except the vestibular surfaces of third molars and the proximal surface sections of molars within a "blind spot" at a distance greater than 2.5 ...

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    16. Optical interference tomographic image generating apparatus and method for using same

      Optical interference tomographic image generating apparatus and method for using same

      Provided are an optical interference tomographic image generating apparatus and a method for using the same, whereby an image can be acquired in which the effect of unnecessary matter near a sample is reduced. An optical interference tomographic image generating apparatus is provided with an OCT control device for performing image processing for vertically inverting an image generated from a detection signal in the case of a setting whereby a reference mirror is disposed so that the optical path length of a reference optical path matches the optical path length of a sample optical path having as a reference position ...

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    17. Evaluation of dental caries, tooth crack, and age-related changes in tooth structure using optical coherence tomography

      Evaluation of dental caries, tooth crack, and age-related changes in tooth structure using optical coherence tomography

      Optical coherence tomography (OCT) is an imaging technique that can visualize the internal biological structure without X-ray exposure. Swept-source OCT (SS-OCT) is one of the latest version of OCT, wherein the light source is a tunable laser that sweeps near-infrared wavelength light to achieve real-time imaging. The imaging depth of OCT is highly influenced by the translucency of the medium. The medium that does not transmit light and the deeper structure beyond the range of light penetration depth are not relevant for OCT imaging. In OCT, sound enamel is almost transparent at the OCT wavelength range, and enamel and dentin ...

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    18. Interfacial Evaluation of CAD/CAM Resin Inlays on the Cavity Floor Using Swept-source Optical Coherence Tomography

      Interfacial Evaluation of CAD/CAM Resin Inlays on the Cavity Floor Using Swept-source Optical Coherence Tomography

      Purpose: The first objective of this study was to determine whether the luting material used for computer-aided design and computer-aided manufacture resin nanoceramic inlays affected interfacial adaptation. The second objective was to investigate whether application of a universal dentin adhesive before cementation affected interfacial adaptation. The final objective was to compare the inlay-side and dentin-side interfaces in the cement space. Methods and Materials: Seventy-four class I cavities were prepared on extracted human third molars. Cavities were optically scanned, and resin nanoceramic inlays were milled using Lava Ultimate blocks (3M ESPE). For the control groups, the fabricated inlays were cemented using ...

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    19. Biomimetic remineralization of artificial caries dentin lesion using Ca/P-PILP

      Biomimetic remineralization of artificial caries dentin lesion using Ca/P-PILP

      Objective To assess the ultrastructural change of demineralized dentin collagen during calcium phosphate polymer-induced liquid precursor (Ca/P-PILP) mediated remineralization process and to evaluate the biomimetic remineralization potential of high concentration Ca/P-PILP at demineralized artificial caries dentin lesion, additionally to investigate the bond interfacial integrity as well as the bonding strength of the biomimetic remineralized artificial caries dentin lesion. Methods Demineralized dentin collagen of 5 μm thick was biomimetically remineralized with low, medium concentration Ca/P-PILP for 10 days and high concentration Ca/P-PILP for 10, 15, 20 days. Artificial caries dentin lesion at a thickness of 150 ± 50 ...

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    20. Morphological, optical, and elemental analysis of dental enamel after debonding laminate veneer with Er,Cr:YSGG laser: A pilot study

      Morphological, optical, and elemental analysis of dental enamel after debonding laminate veneer with Er,Cr:YSGG laser: A pilot study

      Laminate veneer removal is becoming a routine procedure at the dental clinic and the use of laser can facilitate its removal. This work aimed to evaluate the morphological, elemental, and optical changes in the remaining enamel after veneer removal using Er,Cr:YSGG laser. Forty‐four enamel slabs were prepared and randomly distributed into nine experimental groups, for bonding using lithium disilicate laminates with three different luting agents (Variolink Veneer, RelyX U200, and RelyX Veneer). Then each agent was debonded using Er,Cr:YSGG laser (2.78 μm) using two different protocols:3.5 W, 48.14 J/cm 2 ...

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    21. 3D imaging of proximal caries in posterior teeth using optical coherence tomography

      3D imaging of proximal caries in posterior teeth using optical coherence tomography

      Optical coherence tomography (OCT) can create cross-sectional images of tooth without X-ray exposure. This study aimed to investigate the diagnostic accuracy of 3D imaging of OCT for proximal caries in posterior teeth. Thirty-six human molar teeth with 51 proximal surfaces visibly 6 intact, 16 slightly demineralized, and 29 distinct carious changes were mounted to take digital radiographs and 3D OCT images. The sensitivity, specificity and area under the receiver operating characteristic curve (AUC) for the diagnosis of enamel caries and dentin caries were calculated to quantify the diagnostic ability of 3D OCT in comparison with digital radiography. Diagnostic accuracy was ...

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    22. Monitoring fatigue damage in different CAD/CAM materials: A new approach with optical coherence tomography.

      Monitoring fatigue damage in different CAD/CAM materials: A new approach with optical coherence tomography.

      Purpose: To investigate fatigue damage over time, monolithic posterior computer-aided-designed/computer-aided-manufactured (CAD/CAM) crowns were artificially aged in a mouth-motion-simulator, and damage was monitored with optical coherence tomography (OCT). Methods: Forty-eight crowns were milled of six different CAD/CAM-materials (n=8), including 3Y-TZP (Lava Plus,‘3Y’), 4Y-PSZ (Pritidentamultidisc,‘4Y’), 5Y-PSZ (Prettauanterior,‘5Y’), zirconia-reinforced lithium silicate (CeltraDuo,‘ZLS’), hybrid ceramic (Vita Enamic,‘VE’),and resin composite (BrilliantCrios,‘COM’), and were adhesively luted on CAD/CAM-milled human molars. Specimens were artificially aged in a mouth-motion-simulator (50-500N, 2Hz, 37°C) for a period of 1 million cycles. Before loading and every 250,000 ...

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    23. Influence of tissue fixation on depth-resolved birefringence of oral cavity tissue samples

      Influence of tissue fixation on depth-resolved birefringence of oral cavity tissue samples

      Significance: To advance our understanding of the contrast observed when imaging with polarization-sensitive optical coherence tomography (PS-OCT) and its correlation with oral cancerous pathologies, a detailed comparison with histology provided via ex vivo fixed tissue is required. The effects of tissue fixation, however, on such polarization-based contrast have not yet been investigated. Aim: A study was performed to assess the impact of tissue fixation on depth-resolved (i.e., local) birefringence measured with PS-OCT. Approach: A PS-OCT system based on depth-encoded polarization multiplexing and polarization-diverse detection was used to measure the Jones matrix of a sample. A wide variety of ex ...

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    24. Sorptivity of water in enamel for categorizing caries lesions

      Sorptivity of water in enamel for categorizing caries lesions

      Objective The aim of this research was to determine the association between sorptivity of water and the state of mineralization in carious enamel of different stages of severity. Methods As a preliminary work, water droplets of 1.5 μL were placed on the surfaces of hydroxyapatite (HA) discs of different densities. The water droplet profile was dynamically recorded every second over a period of 10 s using a contact angle meter to determine the relationship between sorptivity and density. To measure and calculate sorptivity on enamel surfaces, varnish was painted on the labial surface of 96 extracted caries-free human teeth ...

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