View clinical trials related to Cone-Beam Computed Tomography.
Filter by:COD lesions effect a wide range of different anatomical areas, show different volume and morphometric characteristics.
The aim of this study was to investigate the correlation between the measurements of the specific points of the face (lower face height, midface height, the distance between zygomatic, pupillary distance,interalar distance, epicanthus distance, the distance between commissar) and the dimensions of the maxillary sixth molar tooth (mesiodistal distance, buccal palatal distance, root length, pulp volume).
accuracy of CBCT in measuring soft tissue thickness by using a radiopaque material as the real finding and measurements on pig jaws
measurements performed directly on dry mandibles will be compared with measurements obtained from CBCT( ultra-low dose) scans and Digital panoramic radiography.
To evaluate dimensional bone alterations following horizontal ridge augmentation using guided bone regeneration (GBR) with or without autogenous block graft (ABG) for the rehabilitation of atrophic jaws with dental implants.
study target is assessment of the accuracy of linear measurement obtained from CBCT images on 3D volumetric rendering and multiplanar slices with different voxel sizes
One of the contributing factors to the variability in outcomes amongst Cochlear Implant (CI) recipients was reported to be the placement of the electrode array in the scala tympani. It seems that the correct placement of the electrode initially into the scala tympani and subsequent avoidance of dislocation into the scala vestibuli as the insertion progresses, is a key factor in achieving good speech perception outcomes. Another important aspect related to the performance is the achievement of consistent electrical coverage with the electrode. Data reported for electrodes of different manufacturers give depths ranging from 240 - 600 degrees showing the considerable variation across subjects. The HiFocus mid scala electrode was developed to cover one and a quarter turn and with the pre-curved design to be less susceptible to variations in individual cochlea dimensions and insertion techniques. A further mechanical feature of the pre-curved design is the avoidance of forces against the cochlear lateral wall and associated lower susceptibility of the electrode for moving out of the cochlea following insertion. Recently, a cone beam CT (CBCT) technique is being explored in the field of ENT with the potential to overcome some of the issues associated with the conventional CT techniques such as scattering, radiation and low isometric resolution. Images with comparable details to those of e.g. micro CTs are possible with much lower radiation dose. Modern imaging software i.e. 3D Slicer (www.slicer.org) may be used for 3D reconstruction, post processing and Brainsfit for registration. Registration is the alignment of two scans in the same coordinate system. This enables the identification of differences between two images recorded at time x and y. Once accurately superimposed any difference between the two images may be identified with an accuracy of 0.2 mm. Using these methods, one can assess the stability and the position of the electrode in the cochlea. Objective: The primary objectives of this study are to evaluate the feasibility of using cone beam CT technique in combination with (high resolution) MRI to identify electrode movements following cochlear implant surgery and identify the inter-scalar position of the HFms electrode. The secondary objective is to quantify the average insertion depth and variations of the HFms electrode
Research questions: 1. Will the panoramic images derived from cone beam CT data give better diagnostic ability than conventional panoramic radiographs? 2. Will 3D cephalometric analysis offer the orthodontists and surgeons better information for treatment planning? 3. Will the 3D cephalometric analysis give more accurate treatment plan and better treatment outcome? General hypothesis and special aims Overall aims: - To compare 2D versus 3D cephalometric analysis: treatment planning and therapeutic outcome. - To determine the accuracy and diagnostic ability and usability of the 3D cephalometric analysis. - To evaluate the diagnostic ability and usability of the panoramic image derived from cone beam CT data as compared to 2D panoramic images. - To evaluate the value of the cone beam CT data in cephalometric analysing process for orthodontic and maxillofacial surgery treatment. Hypotheses: 1. The availability of the 3D cephalometric analysis influences the orthodontic and maxillofacial treatment plan and decision, and might change the treatment outcome. 2. Panoramic images derived from cone beam CT data may provide equal information for diagnosis as conventional panoramic images. 3. Cone beam CT will be able to replace "classic orthodontic imaging" being more time and dose efficient and having a beneficial effect on treatment outcome.