Orthodontics and Orthodontology Commons^™

Variability In Selecting Lateral Cephalometric Landmarks In Two Cbct Image Modes, Dana Nguyen

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: The purpose of this study was to determine the variability of lateral cephalometric landmark selection in two cone beam computed tomography (CBCT) lateral cephalometric simulations: 1) a mean projection image (MPI) and 2) a serial sagittal slice image (SSSI).

Methods: A MPI is a two-dimensional (2D) image obtained from the NewTom 3G^TM CBCT that resembles the conventional lateral cephalogram. A SSSI is a 2D image also obtained from CBCT data, but is created by superimposing a series of selected thin sagittal slices containing the required cephalometric landmarks. This study compared the Ricketts and Steiner analysis of the MPI …

Influence Of Common Orthodontic Appliances On Magnetic Resonance Imaging, Joseph Matthew Elison

Loma Linda University Electronic Theses, Dissertations & Projects

Magnetic resonance imaging (MRI) is an essential diagnostic tool in modern medicine. Conditions such as cerebral vascular accidents, epilepsy and other seizure disorders, autism, cancer, migraine and cluster headaches benefit from its use. It has been discovered that 4-10% of all children and adolescents will experience a seizure at some point (Hauser, 1994) and MRI is one of the most common imaging modalities for seizure and epilepsy diagnosis. Unfortunately, some orthodontic materials cause distortion on MR images. Radiologists would probably require the removal of any distortion-causing orthodontic appliance prior to MR imaging. It is questionable whether radiologists would be comfortable …

Dental Maturation In Children Treated For Acute Lymphocytic Leukemia, Michael Grey Weathersby

Theses and Dissertations (ETD)

Acute lymphocytic leukemia (ALL) is a life-threatening disease primarily affecting children. Treatment currently consists of chemotherapy sometimes in combination with head irradiation. The literature documents the damage of treatment to the teeth (e.g., congenital absence, microdontia, abnormal crown- root ratios). The present study assessed the effects of treatment for ALL on the tempos of dental maturation (i.e., dental age) in a mixed longitudinal sample of 72 children treated for ALL at St Jude's Children's' Research Hospital, Memphis, Tennessee. Panoramic radiographs had been taken as indicated to assess and maintain dental health in this retrospective study. Dental age was quantified both …

Dependence Of Craniofacial Growth On Stages Of Cervical Vertebral Maturation And Stages Of Mandibular Canine Mineralization, Charles Allen Chance

Theses and Dissertations (ETD)

When an individual presents for orthodontic treatment, orthodontic records are made that also include demographic information. The orthodontic treatment plan is determined not only from the diagnostic records but also from the relative amounts of growth the orthodontist perceives will take place during treatment. The purpose of this study was to determine if pretreatment biological age, as assessed from cervical vertebral (CV) maturity and/or mandibular canine mineralization, are statistically tied to the amount of growth occurring during treatment, and if so, then if biological age has any predictive merit in anticipating the amounts of growth occurring during treatment. The sample …

Changes In Integumental Dimensions Of The Face Following Orthodontic Treatment: A Long-Term Study, Jack Hou

Theses and Dissertations (ETD)

Most studies of facial growth in adults have relied on cross-sectional data. Longitudinal studies in this area are scarce because it is difficult to collect data on adults across time and because the changes are less dramatic than during childhood or adolescence. An interesting sample exists in the Charles H. Tweed collection, where orthodontic patients were recalled 10 or more years after treatment with an average time out of treatment of about 15 years. The availability of frontal facial photographs from this collection provided us with an uncommon opportunity to longitudinally quantify the changes in facial dimensions from adolescence into …

A New Appliance For Forced Eruption, Monira Uddin Dds, Natia Mosheshvili Dds, Stuart Segelnick

Individual Scholarship

The purpose of these case reports is to introduce an innovative orthodontic appliance to effect forced eruption. This device is useful when attempting to erupt teeth in the esthetic zone with minimal effect on adjacent teeth. It is especially indicated for adjacent teeth with esthetic restorations. The appliance is easy to fabricate, cost-effective and very useful in forced eruption efforts for the “nonrestorable” tooth.

Calpain 10: Mitochondrial Localization, Function, And Substrates, David Darrell Arrington

MUSC Theses and Dissertations

The calpain family of cysteine proteases has undergone intense study since its discovery in 1976. Although numerous functions and proteolytic substrates have been linked to this 14-member family, little is known about the five atypical calpain isoforms. Over the past 25 years, investigators have identified ‘calpain-like’ activities in mitochondrial fractions isolated from various tissues. The studies undertaken in this dissertation were designed to positively identify the mitochondrial calpain present in renal cortical mitochondria (RCM) and to elucidate its function and proteolytic targets under both basal and CA2- -challenged conditions. We identified the RCM calpain as calpain 10 by both immunoblot …

The Anti-Plaque Efficacy Of Listerine® Used In Combination With Toothbrushing In Orthodontic Patients, Zachary A. Casagrande

Theses and Dissertations

The bactericidal efficacy of Listerine®, the essential oil-containing mouthrinse, has long been recognized. The purpose of this study was to determine whether Listerine® mouthrinse, when added to the standard oral hygiene regimen, had an added benefit in reducing plaque and gingivitis development in orthodontic patients over a six-month period. 50 orthodontic patients from the Virginia Commonwealth University Department of Orthodontics were assigned either to the brushing + flossing (N= 25) or brushing + flossing + Listerine® (N = 25) group. At baseline (TI), measurements for the Ramfjord teeth were recorded for the gingival index, plaque index and bleeding index. Subsequent …

Use Of A Synthetic Substrate For Orthodontic Bond Strength Testing, Elijah B. Saikaly

Theses and Dissertations

In vitro bond strength studies are of great importance and interest since they allow the prediction of clinical success of orthodontic adhesives. There are many studies that have investigated bond strength values of bonding systems. However, due to the variation in the materials and methods employed, it is very difficult and often impossible to make comparisons among data. The use of a substrate as an alternate to enamel for mechanical tests would minimize these variables and reduce the challenges faced with in vitro bond strength tests. The purpose of this study was to investigate the suitability of Macor as a …

The Effect Of Media Advertising On Consumer Perception Of Orthodontic Treatment Quality, Daenya T. Edwards

Theses and Dissertations

A survey instrument was designed to evaluate factors influencing consumer selection of an orthodontist and consumer perception of different forms of media advertising (radio, television, newspaper, magazine, direct mail, and billboard) by orthodontic practices. The surveys were distributed by 8 orthodontic offices in and around the Richmond, Virginia area. Out of 676 surveys, 655 (97%) were returned. Respondents most often cited dentist and patient referrals as how they learned of the orthodontic practices they visited (50%- 57%). However, a caring attitude and good practitioner reputation were cited as the top reasons influencing selection of an orthodontist (53% and 49% respectively). …

Treatment Effects Of Incisor Positioning On Anterior Tooth Display, Scott J. Eberle

Theses and Dissertations

The purpose of this study was to determine the effect of changes in maxillary incisor position on anterior tooth display (ATD) in adult (n = 21) and adolescent (n = 38) orthodontic patients. The effects of anterior-posterior, vertical, and angular changes of the maxillary central incisor position during orthodontic treatment were evaluated relative to changes in the amount of ATD measured from pretreatment (TI) and posttreatment (T2) lateral cephalometric radiographs of existing patient records.Results showed a significant relationship between starting ATD and ATD change during treatment for both adults (P = ,006) and adolescents (P