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The Effective Dose Of Different Scanning Protocols Using The Sirona Galileos® Comfort Cbct Scanner, David R. Chambers

Electronic Thesis and Dissertation Repository

Introduction: Cone Beam CT imaging is prevalent in dentistry yet much is unknown with regard to how radiation dose to the patient varies between different CBCT scanners and imaging protocols. Scanner and protocol specific effective dose calculations will aid in optimizing individualized protocols for clinical applications.

Purpose: To determine the effective dose for a range of imaging protocols using the Sirona GALILEOS Comfort CBCT scanner.

Materials and Methods: Calibrated InLight nanoDot OSL dosimeters (Landauer, Glenwood, Ill) were placed at 26 select sites in the head and neck of a modified, human tissue-equivalent RANDO phantom. Effective dose was calculated using …

Comparison Between Ceph Analysis On Lateral Cephs, Cbct Scans, And Mri Scans, Jeffrey W. Lam

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: Most current methods of obtaining images for orthodontic diagnosis and treatment planning involve the use of ionizing radiation. Given that patients often need records taken several times during treatment, an alternative should be found that does not involve ionizing radiation. Magnetic resonance imaging (MRI) exists as a possible alternative. Purpose: The purpose of this study is to compare cephalometric measurements obtained from lateral cephs, cone beam computed tomography (CBCT) scans, and MR scans. Methods: Lateral cephs, CBCTs, and MRIs were taken on 22 patients. 3 separate readers traced the images and the data was analyzed using Bland-Altman plots. Results: …

Accuracy Of Limited Field Cone Beam Computed Tomography In The Detection Of Buccal Cortical Plate Perforations Due To Periapical Lesions, Dan-Linh Ha

Theses and Dissertations

Pre-surgical planning for endodontic microsurgery is facilitated by the use of cone beam computed tomography (CBCT). The purpose of this study was to determine whether limited field CBCT accurately predicts buccal cortical plate perforations due to endodontic lesions. Thirty-five roots that underwent microsurgical root end resection were included in this study. Prior to the surgery, 90 voxel CBCTs were taken with a Carestream 9300. The scans were analyzed by an endodontic resident and oral radiologist to determine the presence of a perforation in the buccal plate. These findings were compared to the clinical appearance of the bone. There was a …

Radiographic Evaluation Of Marginal Bone Levels Around Platform-Switched Implants And Non-Platform-Switched Implants Immediately Loaded To Support Mandibular Overdenture, Fardos N. Rizk, Eatmad Elrekaby

Dentistry

Objective: This clinical study was conducted to assess the marginal bone level around two different types of implant abutment junctions which are the platform-switched connection and non-platform- switched connection used in cases of implants supporting mandibular overdentures following the immediate loading protocol. Materials and Methods: Twelve completely edentulous male patients were randomly divided into two equal groups: Group I: Each patient received two Legacy I Implants designed with internal bevel having 3.5mm implant platform diameter to which 3.5mm neck diameter healing collars were threaded creating a matching or non-platform switching mechanism at the implant abutment junction. Group II: Each patient …