Digital Commons Network^™

In-Vitro Comparison Of Retention Among Contemporary And Conventional Post-And- Cores, Hatem Alqarni

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: Computer-aided design/computer-aided manufacturing (CAD/CAM) technology is gaining popularity in dentistry, and more recently, used to fabricate custom post-andcores (PC) for endodontically treated teeth. The purpose of this study was 1) to evaluate the overall retention of conventional cast gold post-and-cores compared to CAD/CAM fabricated printed, milled titanium post-and-core and milled zirconia post-and-cores based on load, time of dislodgement and 2) to evaluate the mode of failure of the post-and-cores.

Materials and Methods: A maxillary central incisor was selected. Root canal treatment was performed, and acrylic resin pattern was used to fabricate post-and-core. A total of 80 post-and-cores (20 …

Ratio Of Rme Appliance Expansion To Increase In Arch Perimeter Using Cbct Imaging, Evan Agnetta

Loma Linda University Electronic Theses, Dissertations & Projects

Objective: This study measured CBCT images to determine if a consistent ratio exists between the quantifiable number of millimeters a cemented rapid palatal expansion appliance is opened and the subsequent increase in the arch perimeter obtained due to lateral expansion of the arch.

Methods: The following measurements: arch perimeter, arch width at first molars, first bicuspids, appliance length, as well as arch depth; were taken from CBCT images of patients who had completed RME therapy. These were obtained both before and after maxillary palatal expansion therapy using a fixed rapid palatal expander. Correlations were calculated for each of …

Measurements Of The Pharyngeal Airway Using Whole Head 3t Mri And Cbct, Victoria Geren

Loma Linda University Electronic Theses, Dissertations & Projects

Objective: This study compared pharyngeal airway measurements (volume, linear, area) made using whole head Cone-Beam Computed Tomography (CBCT) and 3T Magnetic Resonance Imaging (MRI) methods.

Methods: Eleven subjects (mean age 15y11m) received whole head CBCT (NewTom5G, AFP Imaging, USA) and 3T MRI (Siemens Medical Solutions, DE). Each subject received both scans within a one-month period of time. CBCT images were made with an 18x16 inch field of view, exposure time of 5.4s, and resolution of 0.3x0.3x0.3mm. 3T MR images were captured as contiguous sagittal images of the whole head with a T1- weighted 3D imaging sequence (Magnetization Prepared …

Clinical Effects Of Oral Hygiene Instruction Via Texting In Orthodontic Patients, Jessica Liu

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: This randomized controlled study quantitatively investigated whether providing oral hygiene instruction (OHI), through texting images and videos, affected oral hygiene status in orthodontic patients.

Materials and Methods: Sixty patients between 13-21 years of age, with visible plaque and used a smart phone, were recruited from the Graduate Orthodontic Clinic at Loma Linda University. Once recruited (T1), an initial survey was completed, MBI and OPI were recorded, and OHI was given. Subjects were randomly distributed into either a control or experimental group. The experimental group received OHI texts weekly, whereas the control group did not. After 3 months …

Accuracy Of Surface Area And Volume Measurements Of Teeth Determined From Cbct, Joseph Hourany

Loma Linda University Electronic Theses, Dissertations & Projects

Objective: This study compared surface area and volume measurements made from 3D scans of physical teeth and segmented teeth taken from Cone-Beam Computed Tomography (CBCT) scans of a cadaver. Methods: A cadaver specimen was imaged by CBCT and all the teeth were subsequently extracted and cleaned of any tissue. Of all the extracted teeth, sixteen single-rooted teeth were included in this study. The extracted teeth were scanned with a 3M True Definition 3rd Generation intraoral scanner (3M, ESPE) to generate a stereolithography (STL) file to serve as the control for this study and their surface area and volume measurements as …

Comparison Of Maxillary Sinus Dimensions And Volumes On Cbct And 3t Mr Images, Cara Hodgson

Loma Linda University Electronic Theses, Dissertations & Projects

Objective: This study compared the height, width, length, and volume of the maxillary sinus in Magnetic Resonance Imaging (MRI) and Cone-Beam Computed Tomography (CBCT).

Methods: Eleven human subjects participated in the study (mean age of 14y7m). One CBCT scan and one MRI scan were performed on each patient. CBCT images were captured with an 18 x16 inch field of view that covered the whole head. Contiguous sagittal MR images of the whole head were produced using a 3.0T imaging system with a T1-weighted 3D imaging sequence and isotropic resolution of 1.0 x1.0 x1.0 mm. Images were imported as …

Does Self-Evaluation And Education In Students Change Attitudes And Beliefs Towards Weight Stigma?, Henry A. Garcia

Loma Linda University Electronic Theses, Dissertations & Projects

The current state of global ensures physical therapists will encounter patients that are overweight/obese in all clinical settings, which makes them exceptionally positioned to promote lifestyle modifications to their patients. Unfortunately, weight stigma is highly prevalent among health care providers. Weight stigma has been shown to have adverse effects on patients. The purpose of this study is to measure weight bias in the doctor of physical therapy (DPT) students. Elicit change in obesity stigma in DPT students by way of self-evaluation while enrolled in a course Aspects of Health Promotion (AHP). Methods: Sixty students enrolled in AHP course participated in …

Accuracy Of Intraoral Scanners With Different Total Occlusal Convergence Angles: An In-Vitro Study, Brittany M. Pang

Loma Linda University Electronic Theses, Dissertations & Projects

Digital intraoral imaging has become more utilized in contemporary dental practice. This is performed using an intraoral scanner and it can be used as an alternative to making conventional impressions when indicated. This technology has many advantages, such as decreasing the number of appointments by eliminating traditional techniques, along with a reduction of laboratory time and improved patient comfort. The accuracy of intraoral scanners is currently being assessed in various aspects. To our knowledge, no study has yet addressed the accuracy of intraoral scanners in regards to total occlusal convergence (TOC) of complete coverage of anterior and posterior preparations in …

Complications Associated With Mandibular Fixed Complete Arch Prostheses Based On Implant Distribution, Shivani Karre

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: The objective of this study is to compare incidence and type of complications associated with mandibular implant supported fixed complete arch prostheses based on implant distribution. Material and Methods: Patient Selection: The retrospective study included data collected from axiUm CE Version 6.05.01.2007 from year July 2007 to July 2018 for all patients treated with mandibular implant supported fixed complete arch prostheses (MISFCPs) at Loma Linda University School of Dentistry (LLUSD). One hundred and twenty seven patient’s charts were reviewed to document implant distribution and incidences of complications associated with each implant distribution groups on MISFCPs. Complications like screw …

Comparison Of Antimicrobial Agents Ozonated Olive Oil And Chlorhexidine Gluconate - An In Vitro Study, Amelia David

Loma Linda University Electronic Theses, Dissertations & Projects

Aim: This study was aimed to compare the antibacterial effect of a commercially available OzOO with CHX 0.12% oral rinse solution against periodontal pathogens F. alocis, Aa, S. mitis, and S. mutans using a disk diffusion method.

Materials and Methods:

The antimicrobial agents OzOO and 0.12% CHX were impregnated onto sterile discs and placed onto bacterial cultures of F.alocis, Aa, S.mutans, and S.mitis to evaluate their antimicrobial activity by the disk diffusion susceptibility method. The bacterial growth inhibition zone surrounding each disc was measured in millimeters of diameter with calipers to assess the antimicrobial activity of each agent. …