Medicine and Health Sciences Commons^™

Effect Of Centric Interference On Canine Tooth Wear, Andrey Gaiduchik

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: The aim of this study was to determine the long term effect of a centric interference on canine tooth wear (CTW) and on centric occlusion (CO) and maximal intercuspation (MIP) variance. Materials and Methods: Thirty subjects, 11 males and 19 females, were selected based on inclusion and exclusion criteria. Changes in enamel volume were studied between the end of orthodontic treatment (T2) and at least seven years post treatment (T4). All models were scanned using a high resolution desktop scanner, (OrthoInsight 3D Scanner™, MotionView LLC). T4 models were articulated using a Panadent® Articulator and evaluated for dental interferences and …

Estimating Root Volumes By Limited Segmentation: A Volumetric Analysis Of Cbct And Micro-Ct Data, Theresa C. Baldwin

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: The increased dimensional accuracy of images provided by cone beam computed tomography (CBCT) scans allows for more in-depth diagnosis and treatment planning. Expedient interpolation of segmented data that provides clinically acceptable results will encourage clinicians to frequently use CBCT images for clinical/radiographic evaluation. Some of these applications include, quantification of root resorption, determination of force required for specific tooth movements, and customized appliances. Purpose: The study had two purposes. The first was to compare the accuracy of digital tooth volumes acquired from CBCT to the gold standard, micro-computed tomography (micro-CT). The second was to determine the effect of axial …

In-Vitro Evaluation Of Accuracy Of Conventional And Cad/Cam Removable Partial Denture Frameworks, Pooya Soltanzadeh

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, to fabricate removable partial dentures (RPD). The purpose of this study was 1) to evaluate the overall accuracy and fit of conventional versus CAD/CAM fabricated printed RPD frameworks based on STL data analysis, and 2) to evaluate the accuracy and fit of each component of the RPD framework. Materials and Methods: A maxillary metal framework was designed for a Kennedy class III modification I situation. The master model was scanned and used to compare the fit and accuracy of the RPD frameworks. A total of 40 …

Reliability And Accuracy Of A Novel Photogrammetric Orthodontic Monitoring System, Vahe Ohanesian

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: This study quantitatively investigated the reliability and accuracy of Dental Monitoring’sTM proprietary orthodontic tracking system in comparison to an established reference. Materials and Methods: Intraoral scans (True Definition Scanner, 3MTM) and video scans (iPhone 7, AppleTM) were taken of 30 subjects undergoing comprehensive orthodontic treatment at Loma Linda University’s Graduate Orthodontic Clinic at T1 (initial) and T2 (3 months later). At each time point, an intraoral scan was taken by the operator followed by three video scans- two taken by the patient and one by the operator. Three linear and three angular measurements were analyzed using Dental Monitoring’sTM tracking …

Accuracy Of Cephalometric Analyses And Tooth Movements Of Conventional Vs Cbct-Generated Cephalograms, Thanh Khong Ng

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: The aim of this study was to compare Ricketts and American Board of Orthodontics (ABO) cephalometric measurements and tooth movements from tracings between conventional lateral cephalograms (Sirona Orthophos XG Plus, Charlotte, NC) and CBCT-generated cephalograms (NewTom 5G; QR srl, Verona, Italy). Materials and Methods: Patients who had bilateral Angle’s class II molar were evaluated. Pre-treatment (T1) and post-treatment (T2) conventional lateral cephalograms (CLCs) and CBCT-generated lateral cephalograms (CBLCs) were traced in Quick Ceph Studio using Ricketts and ABO cephalometric analyses. Linear and angular cephalometric measurements from tracings were compared between the two radiographic modalities using one-sample Wilcoxon signed rank …

The Wear Of Acrylic Resin And Composite Resin Teeth Against Polished And Glazed Zirconia, Abdulkareem Alshehri

Loma Linda University Electronic Theses, Dissertations & Projects

Background: Excessive wear for the occlusal surfaces of teeth results in decreased masticatory efficiency, poor esthetics and leads to reduced the occlusal vertical dimension which could lead to the development of temporomandibular disorders, consequently, further compromise function. Very few studies have been performed on the wear resistance of zirconia against artificial denture teeth and human enamel. Aim: The purpose of this study was to investigate the influence of polished zirconia (PZ) and glazed zirconia (GZ) on the 2-body wear resistance (vertical substance loss) of seven commercially available denture teeth made of different resins. Material and Method: Eight groups (n=10) of …

A Retrospective Cephalometric Growth Study Of Sagittal Airway In Skeletal Class Ii Patients, Sue V. Kim

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: The study retrospectively determined the average sagittal pharyngeal airway widths in Class II males and females between 7 to 16 years of age and changes in sagittal airway with increasing age. Additionally, this study determined whether average airway differs between gender at each age and compared the average airway widths in relation to increasing age between Class I and II patients. Materials and Methods: Longitudinal cephalograms were digitally traced for 38 untreated subjects (23 males, 15 females) from age 7 to 16 with skeletal and dental Class II patterns. These records were previously taken through growth studies conducted between …

Measuring A Sample Of Orthodontic Models/Panographs At Llusd Using The Cr-Eval, Jonathan Michael Drew

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: An index must be used to quantify the improvement in the position of teeth treated by orthodontics. The Cast-Radiograph Evaluation is the index used by the American Board of Orthodontics. The purpose of this study is to use this index to evaluate treatment outcomes in the graduate orthodontic clinic at Loma Linda University from 2012-2016. Materials and Methods: Patients included were comprehensively treated, debonded between 1/1/2012 and 12/31/2016, and under age 30. A total of 80 patients were randomly selected, with 16 coming from each year. The ABO DI was used to score the T1 models, and the CR-Eval …

A Digitized Comparison Using Cone Beam Computed Tomography And Intraoral Scanning, Yvette Carrillo

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: The purpose of this study was to evaluate the accuracy of digital workflow by evaluating the absolute technical differences in various scanning methods on jaw models with scanning bodies.

Material and Methods: Twenty identical 3-dimensionally printed mandibular quadrant jaw models with a single implant and scanning body replacing a missing tooth in area #19 were examined. Cone beam computed tomography .STL files were used as the first test group. Intraoral scans were used as the second test group. Desktop scans of each model and the .STL file was used as a control. The .STL files were then …