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

2018 ◽  
Vol 4 (1) ◽  
pp. 559-562
Author(s):  
Florian Tetschke ◽  
Jonas Golde ◽  
Julia Walther ◽  
Lars Kirsten ◽  
Edmund Koch ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Spectral Domain ◽  
Structural Defects ◽  
Degree Of Polarization ◽  
Radiographic Examination ◽  
Optical Coherence ◽  
Bond Failure ◽  
Adhesive Layers ◽  
Dental Restorations ◽  
Polarization Characteristics

AbstractRestoration 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 such as inhomogeneous adhesive layers, marginal gaps and bubbles. In addition, DOPU representation showed an inhomogeneous structure within the composite material. OCT based imaging of dental restorations could add a valuable diagnostic tool for the evaluation of structural defects in clinical practice. The representation of polarization characteristics with the DOPU algorithm provides further information on the homogeneity of the restoration.

Is high-resolution spectral domain optical coherence tomography reliable in nystagmus?

2011 ◽  
Vol 97 (4) ◽  
pp. 534.1-536 ◽  
Author(s):  
Mervyn G Thomas ◽  
Anil Kumar ◽  
John R Thompson ◽  
Frank A Proudlock ◽  
Kees Straatman ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
High Resolution ◽  
Spectral Domain ◽  
Optical Coherence

Repeatability of Spectral Domain Optical Coherence Tomography Measurements in High Myopia

2016 ◽  
Vol 25 (5) ◽  
pp. e526-e530 ◽  
Author(s):  
Harsha L. Rao ◽  
Addepalli U. Kumar ◽  
Sampath R. Bonala ◽  
Kadam Yogesh ◽  
Bodduluri Lakshmi
Keyword(s):  
Optical Coherence Tomography ◽  
High Myopia ◽  
Spectral Domain ◽  
Optical Coherence

scholarly journals Comparison of swept-source versus spectral-domain optical coherence tomography angiography for detection of macular neovascularization

2021 ◽  
Author(s):  
Anna Lentzsch ◽  
Laura Schöllhorn ◽  
Christel Schnorr ◽  
Robert Siggel ◽  
Sandra Liakopoulos
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Spectral Domain ◽  
Optical Coherence ◽  
Cross Sectional ◽  
Swept Source ◽  
En Face ◽  
Increased Sensitivity ◽  
Sensitivity Specificity ◽  
Subretinal Hyperreflective Material

Abstract Purpose To compare swept-source (SS) versus spectral-domain (SD) optical coherence tomography angiography (OCTA) for the detection of macular neovascularization (MNV). Methods In this prospective cohort study, 72 eyes of 54 patients with subretinal hyperreflective material (SHRM) and/or pigment epithelial detachment (PED) on OCT possibly corresponding to MNV in at least one eye were included. OCTA scans were acquired using two devices, the PLEX Elite 9000 SS-OCTA and the Spectralis SD-OCTA. Fluorescein angiography (FA) was used as reference. Two graders independently evaluated en face OCTA images using a preset slab as well as a manually modified slab, followed by a combination of en face and cross-sectional OCTA. Results Sensitivity (specificity) for the automated slabs was 51.7% (93.0%) for SS-OCTA versus 58.6% (95.3%) for SD-OCTA. Manual modification of segmentation increased sensitivity to 79.3% for SS-OCTA but not for SD-OCTA (58.6%). The combination of en face OCTA with cross-sectional OCTA reached highest sensitivity values (SS-OCTA: 82.8%, SD-OCTA: 86.2%), and lowest number of cases with discrepancies between SS-OCTA and SD-OCTA (4.2%). Fleiss kappa as measure of concordance between FA, SS-OCTA, and SD-OCTA was 0.56 for the automated slabs, 0.60 for the manual slabs, and 0.73 (good agreement) for the combination of en face OCTA with cross-sectional OCTA. Concordance to FA was moderate for the automated slabs and good for manual slabs and combination with cross-sectional OCTA of both devices. Conclusion Both devices reached comparable results regarding the detection of MNV on OCTA. Sensitivity for MNV detection and agreement between devices was best when evaluating a combination of en face and cross-sectional OCTA.

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