Medicine and Health Sciences Commons^™

Cbct Panoramic Images Vs. Traditional Panoramic Radiographs, Sunny Young Hutchinson

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this research was to compare the accuracy of angular measurements of the panoramic image of the Newtom 9000™ Cone Beam Computed Tomography (CBCT) with the Sirona™ Orthophos panoramic unit. The study was separated into three parts: phantom study, patient study, and archform study. The phantom study used fabricated phantom typodonts to compare angular measurements between the Newtom 9000™ panoramic image and the Sirona™ panoramic radiograph. Accuracies of the measurements were then determined by comparing the values to the actual phantom typodont. No marked differences in angular measurements were recorded for the phantom typodont using either of the …

Prevalence Of Degenerative Joint Disease In A Pre-Orthodontic Adolescent Sample, Marie Mansour

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this research was to determine a prevalence of degenerative joint disease in our pre-orthodontic adolescent patients age ten through seventeen. The prevalence was assessed according to gender. Severity of DJD was established for each patient and a "red flag" for diagnosis was identified. The purpose was also to establish norms for joint space for patients with and without degenerative joint disease. Correlations to distal condyle position and angle classification were described. 123 consecutive patients, 77 female and 46 male T1 NewTom records were reviewed. Severity of DJD was classified according to none, mild, moderate, and severe. Sagittal …

Cone Beam Ct And Digital Radiography. A Comparative Study Of P/A Cephalometrics., Michael John Erickson

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this study was to determine if Rickett's posterio-anterior (P/A) cephalogram measurements could be obtained from Cone Beam Computerized Tomographic (CBCT) images taken on the NewTom QR-DVT 9000™.

Fifteen frontal cephalometric radiographs were chosen for good image quality, with no regard for patient age or gender. Each cephalogram was traced three times by the same operator using ZeroBase™ software. Landmarks were located and measured according to the Rickett's frontal analysis technique. Methods were devised for obtaining analogous measurements using CBCT images on the same group of patients.

Measurements obtained using CBCT correlated well with those obtained using the …

Condylar Remodeling After Distraction Osteogenesis And Bilateral Sagittal Split Osteotomy, Robert Barker Hoffman

Loma Linda University Electronic Theses, Dissertations & Projects

The present pilot study is a histological evaluation of mandibular condyles taken from minipigs that underwent either traditional mandibular advancement (bilateral sagittal split osteotomy), or a distraction osteogenesis procedure to advance the mandible. One pig received a bilateral sagittal split osteotomy with an immediate mandibular advancement of 14 mm, while another pig underwent distraction osteogenesis consisting of a gradual advancement of 2 mm per day to advance the mandible the same distance. The control animal received no surgery.

In the present study, the mandibular condyles of the three pigs (2 control, 2 bilateral sagittal split osteotomy, and 2 distraction osteogenesis) …

Factors Influencing Applicant Ranking Of Orthodontic Programs, Michael D. Payne

Theses and Dissertations

Orthodontic programs spend considerable amounts of time and energy to attract, recruit, and interview the best and brightest applicants. Applicants and programs submit ranked preferences, and resident positions are filled by a computerized matching system (Match). The specific aims of this study were to determine the relative importance of certain factors in applicants' Match ranking of orthodontic programs and to determine differences between orthodontic Program Directors perceptions and actual factors cited by applicants influencing their ranking of orthodontic programs.Surveys were mailed to 55 orthodontic Program Directors and 478 applicants participating in the 2002 orthodontic Match. Forty-nine Program Director (89%) and …

Bonding Properties Of Newly Erupted And Mature Human Premolars, Diana Marie-Skinner Almy

Theses and Dissertations

Following eruption of a tooth into the oral cavity, enamel is thought to continue to calcify. The continued calcification and maturation of enamel is described as "post-eruptive enamel maturation." It is believed that an observed decrease in enamel pore size and increase in the calcification of enamel matrix over time can be attributed to this process. In recent years, there has been a significant increase in the number of adult patients seeking orthodontic treatment. Since orthodontic attachments are bonded directly to the etched enamel using composite resin, post-eruptive enamel maturation may affect the bonding process. The purpose of this study …

Appointment Keeping Behavior Of Medicaid Vs. Non-Medicaid Orthodontic Patients, Bryan P. Horsley

Theses and Dissertations

State Medicaid programs were established to care for the poor by eliminating financial barriers and increasing their ability to be treated within the mainstream of the heath care system. The number of children eligible for Medicaid services is increasing, yet the number of Medicaid providers remains low. Health care providers cite failed appointments as being a major problem with Medicaid patients and one of the largest deterrents to participating. The purpose of this study was to determine whether a difference in appointment keeping behavior exists between Medicaid and non-Medicaid orthodontic patients. During a twelve-month period, a tally of appointments was …

Overbite Correction And Smile Esthetics, Shannon Michelle Lewis

Theses and Dissertations

Achievement of optimum smile esthetics during orthodontic treatment has recently been the focus of several published articles in the orthodontic literature. Authors speculate that overbite correction, specifically maxillary incisor intrusion, will lead to flattening of the smile arc and consequently reduce smile attractiveness. The purpose of this prospective clinical study was to investigate differences in outcomes from two common treatment modalities used to reduce deep overbite: maxillary incisor intrusion using an intrusion arch and posterior tooth eruption using an anterior bite plate. Pre-treatment and post-overbite correction records were gathered from 20 patients who presented with deep overbite malocclusions to the …