1. Articles from Rainer Haak

    1-13 of 13
    1. 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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    2. 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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    3. Evaluation of calculus imaging on root surfaces by spectral-domain optical coherence tomography

      Evaluation of calculus imaging on root surfaces by spectral-domain optical coherence tomography

      Objective The aim of this in vitro study was to evaluate the ability of optical coherence tomography (OCT) to display calculus on root surfaces. Material and methods Ten teeth with calculus on the root surface were embedded in resin, omitting the root surface. A region of interest (ROI) was marked by small drill holes coronally and apically of the calculus and imaged by spectral-domain optical coherence tomography ([SD OCT], Telesto SP5, centre wavelength 1310 nm) and light microscopy (LM). To evaluate the impact of different fluids on calculus visualisation, using OCT, root surfaces were covered by a layer of NaCl ...

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    4. Visualization of the pulp chamber roof and residual dentin thickness by spectral-domain optical coherence tomography in vitro

      Visualization of the pulp chamber roof and residual dentin thickness by spectral-domain optical coherence tomography in vitro

      The aim of this study was to evaluate the ability of spectral-domain optical coherence tomography (SD-OCT) to display the roof of the pulp chamber and to estimate the residual dentin thickness (RDT) of the pulp complex. The roots of 20 extracted human molars were embedded in epoxy resin, and crowns were longitudinally sectioned in the mesial-distal direction, exposing the pulp chamber. The coronal part of the crown was removed up to an RDT to the pulp chamber roof of 2 mm. Samples were imaged by SD-OCT from coronal view and by light microscopy (LM) in the sagittal plane. Using a ...

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    5. Is Optical Coherence Tomography a Potential Tool to Evaluate Marginal Adaptation of Class III/IV Composite Restorations In Vivo?

      Is Optical Coherence Tomography a Potential Tool to Evaluate Marginal Adaptation of Class III/IV Composite Restorations In Vivo?

      Objective: Margin analysis of Class III and IV composite restorations in vitro and in vivo occurred by scanning electron microscopy (SEM) and optical coherence tomography (OCT). The results were compared and related to clinical evaluation. Methods and Materials: Eight Class III composite restorations were imaged in vitro using OCT and SEM. The margins were analyzed quantitatively. OCT signals were verified by assignment to the criteria perfect margin, gap, and positive/negative ledge. In vivo quantitative margin analysis of Class III/IV composite restorations made of the micro-hybrid composite Venus combined with the self-etch adhesive iBond Gluma inside (1-SE) or etch-and-rinse ...

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    6. Visualization of interfacial adhesive defects at dental restorations with spectral domain and polarization sensitive optical coherence tomography

      Visualization of interfacial adhesive defects at dental restorations with spectral domain and polarization sensitive optical coherence tomography

      Restoration loss based on interfacial adhesive defects and associated caries at the restoration margin are the main causes for invasive replacement of dental restorations. Assessment of the interfacial quality based on clinical inspection and radiographic examination is often difficult and not reliable. In this work, we present spectral domain optical coherence tomography (SDOCT) and polarization sensitive optical coherence tomography (PSOCT) for the evaluation of tooth-composite bond failure. Imaging of two composite restorations at the occlusal surface are presented using intensity-based images obtained by SDOCT and PSOCT based degree of polarization uniformity (DOPU). Both modalities revealed several defects beneath the surface ...

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    7. OCT for early quality evaluation of tooth–composite bond in clinical trials

      OCT for early quality evaluation of tooth–composite bond in clinical trials

      Objectives To evaluate early quality of composite restorations with a universal adhesive in different application modes clinically and with optical coherence tomography (OCT). Methods 22 patients with four non-carious cervical lesions each received composite restorations (Filtek Supreme TM XTE, 3 M). The universal adhesive Scotchbond Universal TM (SBU, 3 M) was applied with three etching protocols: self-etch (SE), selective-enamel-etch (SEE) and etch-and-rinse (ER). The etch-and-rinse adhesive OptiBond TM FL (OFL, Kerr) served as a control. Restorations were imaged by OCT (Thorlabs) directly after application (t 0 ). After 14 days (t 1 ) and 6 month (t 2 ) OCT imaging (interfacial adhesive ...

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    8. Optical coherence tomography to evaluate variance in the extent of carious lesions in depth

      Optical coherence tomography to evaluate variance in the extent of carious lesions in depth

      Evaluation of variance in the extent of carious lesions in depth at smooth surfaces within the same ICDAS code group using optical coherence tomography (OCT) in vitro and in vivo. (1) Verification/validation of OCT to assess non-cavitated caries: 13 human molars with ICDAS code 2 at smooth surfaces were imaged using OCT and light microscopy. Regions of interest (ROI) were categorized according to the depth of carious lesions. Agreement between histology and OCT was determined by unweighted Cohen’s Kappa and Wilcoxon test. (2) Assessment of 133 smooth surfaces using ICDAS and OCT in vitro, 49 surfaces in vivo ...

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    9. OCT assessment of non-cavitated occlusal carious lesions by variation of incidence angle of probe light and refractive index matching

      OCT assessment of non-cavitated occlusal carious lesions by variation of incidence angle of probe light and refractive index matching

      Objectives This study evaluated (1) the detection and assessment of non-cavitated occlusal carious lesions by spectral domain optical coherence tomography (SD-OCT) and (2) the impact of varying angle of incidence (AI) of probe light and refractive index matching (RIM). Methods Nine extracted human molars with 18 occlusal lesions (ICDAS code 2) were visually selected. 18 regions of interest (ROI) were imaged with SD-OCT under varying AI (0°, ±5°, ±10°, ±15°) and with/without application of glycerine at 0°. X-ray micro computed tomography (μCT) was used as a validation standard. μCT and OCT signals were categorized according to the lesion extent ...

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    10. Dental Applications of Optical Coherence Tomography (OCT) in Cariology

      Dental Applications of Optical Coherence Tomography (OCT) in Cariology

      Across all medical disciplines, therapeutic interventions are based on previously acquired diagnostic information. In cariology, which includes the detection and assessment of the disease “caries” and its lesions, as well as non-invasive to invasive treatment and caries prevention, visual inspection and radiology are routinely used as diagnostic tools. However, the specificity and sensitivity of these standard methods are still unsatisfactory and the detection of defects is often afflicted with a time delay. Numerous novel methods have been developed to improve the unsatisfactory diagnostic possibilities in this specialized medical field. These newer techniques have not yet found widespread acceptance in clinical ...

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    11. Imaging Resin Infiltration into Non-Cavitated Carious Lesions by Optical Coherence Tomography

      Imaging Resin Infiltration into Non-Cavitated Carious Lesions by Optical Coherence Tomography

      Objectives Visualisation of the etching process and resin penetration at white spot carious lesions by spectral domain optical coherence tomography (SD-OCT). Materials and methods The non-cavitated carious lesions (ICDAS code 2) of four visually preselected extracted human molars and premolars were verified as enamel lesions by micro computed tomography (μCT). One region of interest (ROI) per tooth was marked by two drill-holes in occlusal-cervical direction. The lesions were imaged by SD-OCT. Lesions were infiltrated (Icon, DMG) according to the manufacturer’s instructions. During each treatment step and after light curing of the infiltrant, the ROIs were imaged again by SD-OCT ...

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    12. Assessment of defects at tooth/self-adhering flowable composite interface using swept-source optical coherence tomography (SS-OCT)

      Assessment of defects at tooth/self-adhering flowable composite interface using swept-source optical coherence tomography (SS-OCT)

      Abstract Objectives Assessment of adhesive defects of a self-etch adhesive and a self-adhering flowable composite at the tooth/composite interface before and after water storage by optical coherence tomography (OCT). Methods 16 extracted human molars ( n = 8 each) with box-shaped, class-V cavities were restored either with an experimental self-adhering flowable composite (EF, DMG) or with the filling system Adper™ Prompt™ L-Pop™/Filtek™ Supreme XT Flowable composite (PLP, 3M ESPE). Restorations of both groups were non-invasively imaged using swept-source OCT before and after storage in water. The OCT signal for adhesive defects at the tooth/composite interface was quantified. Results At ...

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    13. Assessment of interfacial defects at composite restorations by swept source optical coherence tomography

      Assessment of interfacial defects at composite restorations by swept source optical coherence tomography

      In clinical dental practice, it is often difficult or even impossible to detect and assess interfacial adhesive defects at adhesive restorations by means of visual inspection or other established diagnostic methods. However, nondestructive optical coherence tomography (OCT) may provide a better picture in this diagnostic scenario. The aim of this study was to evaluate the suitability of swept source OCT (SS-OCT) for the nondestructive assessment of interfacial deficiencies at composite restorations and the evaluation of cohesive defects within composite material. Ten class V composite restorations that were not adhesively luted were taken as validation objects and examined for frequency of ...

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    1-13 of 13
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  2. Topics in the News

    1. (10 articles) University of Leipzig
    2. (3 articles) Thorlabs
    3. (1 articles) University of Lübeck
    4. (1 articles) Dresden University of Technology
    5. (1 articles) Julia Walther
    6. (1 articles) Gereon Hüttmann
    7. (1 articles) Edmund Koch
    8. (1 articles) Lars Kirsten
    9. (1 articles) Thomas Jefferson University
    10. (1 articles) Massachusetts General Hospital
    11. (1 articles) Polytechnique Montreal
    12. (1 articles) Wakayama Medical University
    13. (1 articles) Masamichi Takano
    14. (1 articles) Carol L. Shields
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    16. (1 articles) Theo Lasser
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    Assessment of interfacial defects at composite restorations by swept source optical coherence tomography Assessment of defects at tooth/self-adhering flowable composite interface using swept-source optical coherence tomography (SS-OCT) Imaging Resin Infiltration into Non-Cavitated Carious Lesions by Optical Coherence Tomography Dental Applications of Optical Coherence Tomography (OCT) in Cariology OCT assessment of non-cavitated occlusal carious lesions by variation of incidence angle of probe light and refractive index matching Optical coherence tomography to evaluate variance in the extent of carious lesions in depth OCT for early quality evaluation of tooth–composite bond in clinical trials Visualization of interfacial adhesive defects at dental restorations with spectral domain and polarization sensitive optical coherence tomography Is Optical Coherence Tomography a Potential Tool to Evaluate Marginal Adaptation of Class III/IV Composite Restorations In Vivo? Visualization of the pulp chamber roof and residual dentin thickness by spectral-domain optical coherence tomography in vitro Residual thrombus following plaque disruption contributes to rapid plaque progression: in-vivo serial optical coherence tomography imaging Pigmented Iris Lesion on Anterior-Segment Swept-Source Optical Coherence Tomography