Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"angulation"”.
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A Study of Crown and Root Angulation on Maxillary First and Second Bicuspids
… was to examine the normal variations in crown angulation of individual maxillary bicuspids, in a simulated flat plane of occlusion, and how this relates to marginal ridge discrepancies. A second purpose of this study was to examine these same teeth for the angulations of the roots. Fifty …
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Evaluation of image receptor angulation during mediolateral oblique positioning for optimised pressure and area distribution in mammography
BackgroundMammography is the gold standard diagnostic tool for the screening and diagnosis of breast cancer; however, it is associated with pain and discomfort. The pain and discomfort are mostly due to positioning and the compression applied during the procedure. Currently there are variations in …
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Angular limb deformities affecting the canine radius and ulna : classification using the center of rotation of angulation method
… plane, and the presence of sagittal plane angulation, torsion, and adjacent joint radiographic disease were determined and compared. Thirty-five uniapical, 70 biapical, and 1 multiapical deformities in the frontal plane were identified. The incidence of biapical deformities was …
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Femoral angles and their correlates
… focuses on the ontogeny and development of the angulation of the hip and knee, and specifically how variation in angulation relates to variation in body form, mobility patterns, postural behaviors, and gait-related disorders. The primary data for this study are femoral angels and cross-sectional …
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An in vitro comparison of working length accuracy between a digital system and conventional film when vertical angulation of the object is variable
… determination of working lengths when vertical angulation of the object is variable. Twelve teeth with #15 K-flex files at varying known lengths from the anatomical apex were mounted in a resin-plaster mix to simulate bone density. A mounting jig for the standardization of projection geometries …
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The impact alteration of X-ray source subject projection geometry has on the ability to detect demineralisation in occlusal cavities using digital subtraction radiography: an in-vitro study
… degree horizontal, and 10 and 15 degree vertical angulation variations in X-ray source subject projection geometry in addition to 0 degrees. Following placement of demineralising solution in 19 cavities, 0 degree radiographs were taken after 12, 18 and 24 hours. Digital subtraction images were …
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Effect of Build Angle and Model Body Type (Solid vs Shell) on Accuracy of 3D-Printed Orthodontic Models Using a DLP Printer
This study examined the effect that print angulation and model body type (solid vs. shell) have on the accuracy of orthodontic models printed with a digital light processing (DLP) 3D printer. The following six configuration of models were printed: 0° Solid, 0° Shell, 70° solid, 70° shell, 90° …
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An investigation of the influence of radiographic malpositioning and image processing algorithm selection on ICU/CCU chest radiographs
… phantom experiment to estimate the degree of angulation have a large effect upon the appearance of anatomical structures, but it does not have a particularly large effect upon the apparent changes of tube/line position central venous catheter and endotracheal tube (CVC, ETT). The study also …
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An investigation of the influence of radiographic malpositioning and image processing algorithm selection on ICU/CCU chest radiographs
… phantom experiment to estimate the degree of angulation have a large effect upon the appearance of anatomical structures, but it does not have a particularly large effect upon the apparent changes of tube/line position central venous catheter and endotracheal tube (CVC, ETT). The study also …
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Keimreduzierende Tiefenwirkung des ErCr:YSGG-Lasers auf Enterococcus faecalis innerhalb des Wurzelkanalwanddentins : ein In-vitro-Versuch
… and its dependence of the working tip angulation. Also the morphologic changes of the lasered areas are valued with scanning electron microscopy. After cleansing and shaping extracted single root human teeth to ISO 40, longitudinal section dentin slices of different thicknesses (0,1mm, …
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Evaluation of printing orientation, layer thickness and auxilary cross-arch bar in 3-dimensional dental printing on the trueness and precision of full arch polymeric fixed dental prostheses
… by examining the effects of different printing angulations, layer thicknesses, and the inclusion of a horizontal cross-arch bar. MATERIALS AND METHODS: Two 3D-printed dental resin materials for full-arch fixed dental prostheses were used in this study; Lucitone Digital IPN™ and OnX Tough 2. A …
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Evaluation of Tensile Bond Strength of Glass Ionomer Cements for Orthodontic Bonding
… the bracket/adhesive/enamel complex with varying angulation of force application at debonding. The mean tensile bond strength value of 0.82 ± 0.36 MPa for SHOFU® Glasionomer Type I was significantly less (p<0.05) than the values of 1.13 ± 0.33 MPa for Ketac®-cem and 1.26 ± 0.40 MPa for Fuji I™. …
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Novel Smart Actuation Systems for Single-port Laparoscopic Surgical Instruments
… it is difficult to achieve the required angulation during these procedures. This problem was worsened by the limited functionality of the current surgical instruments, which are rigid and slender, resulting in their inability to provide the optimum articulation required to complete …
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Spatial Resolution Analysis of a Variable Resolution X-ray Cone-beam Computed Tomography System
… (<em>v</em>) axis independently. The detector angulation improves the spatial resolution of the CT images by changing the effective size of each detector cell. Two components of spatial resolution of the system, namely the transverse and axial modulation transfer functions (MTF), are analyzed …
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Premolar Extraction Cases Treated with Aligners: Are Contemporary Results Comparable to Fixed Appliances?
… treated in the past 5 years. However, incisor angulation, overbite, and root parallelism were not managed as well with aligners.
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Optical accuracy assessment of fully guided Yomi implant surgery in partially edentulous cases
… versus actual position, the global position and angulation of the implant were referenced indirectly with the use of a scan body. Twelve (12) fully guided implant samples were evaluated from eight (8) patients. The mean positional deviation at the top of the scan bodies was 1.3389 mm. The mean …
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Magnetische versus manuelle Navigation in der interventionellen Neuroradiologie : In-vitro-Ergebnisse
… investigators. One aneurysm with an acute angulation from the carrier vessel could be navigated only with the MG while the SG failed, even after multiple reshaping manoeuvres. Conclusion: Our findings suggest that magnetic navigation seems to be easier, more accurate and faster in the hands …
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Evaluation of Alveolar and Soft Tissue Changes after Muscular Release Surgery in Patients Undergoing Fixed Orthodontic Therapy
… Likewise, the changes in age and lower incisor angulation from pre-treatment to post-treatment did not significantly impact the amount of changes seen in inner area, S4 to B point, and keratinized gingiva. Overall, the patients in this study benefited mostly from the repositioning of peri-oral …
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