Orthodontics and Orthodontology Commons^™

Three-Dimensional Force Systems Produced By Vertical V-Bends In An Arch Wire, Raja Shah

Master's Theses

No abstract provided.

The Effect Of Corticision On The Rate Of Orthodontic Tooth Movement In Rats, Hamed Vaziri

Master's Theses

Minimal treatment time is a primary goal for orthodontic therapy. Reducing treatment time decreases risk of caries, periodontal disease, root resorption, and increases patient satisfaction. Orthodontic tooth movement (OTM) is a result of bone resorption and apposition; factors influencing the rate at which these processes take place may affect OTM. Various attempts have been made to shorten treatment time. The regional acceleratory phenomenon (RAP) has been used to modify the balance between resorption and apposition of bone through selectively injuring the cortical plate of the alveolus to accelerate tooth movement. This approach is limited due to the need of flap …

Skeletal And Dental Components Of Class Ii Division 1 Correction With The Mara Compared To The Standard Edgewise Appliance, Zachary Paul Pitcher

Theses and Dissertations (ETD)

Many tools are available to correct Class II dental relationships. A functional orthopedic appliance is a popular type of Class II corrector that is thought to correct Class II dental relationships both dentally and skeletally by enhancing mandibular growth. The purpose of the study was to quantify differences in the amounts of skeletodental change based on treatment (MARA and Standard Edgewise) in Class II Division 1 patients. The sample consisted of 2 groups of Class II Division 1 patients: 51 patients treated with the MARA followed by an Edgewise appliance and another group of 51 patients treated with the Standard …

Rankl And Osteoprotegerin Levels In Response To Orthodontic Forces, Katherine Ann Hart D.D.S.

Theses and Dissertations (ETD)

Orthodontic tooth movement is mediated by interactions between PDL cells and those of the alveolus. One protein—the receptor activator nuclear factor kappa B ligand (RANKL)—is critical for osteoclastogenesis, and osteoprotegerin (OPG) is a decoy ligand that competitively inhibits RANKL. A higher RANKL/OPG ratio is associated with areas of bone resorption, while a lower ratio occurs in areas of bone deposition and homeostasis. There have been almost no clinical studies of RANKL and OPG expression in human subjects undergoing orthodontic tooth movement. The purpose of this study was to quantify changes in the levels of RANKL and of OPG expression in …

A Secular Increase In The Tempos Of Tooth Formation: 1980-2010, Kevan Michael O'Neill

Theses and Dissertations (ETD)

Introduction: Improved environments in the U.S. have resulted in taller, larger, and heavier children and adults compared to past generations. Studies of other skeletal-dental dimensions have shown increases across generations, and our perception is that teeth now are forming faster. The purpose of this study is to test for a secular trend towards faster tempos of tooth mineralization in a sample of U.S. white adolescents over the past quarter century (1980-85 to 2005-10).

Materials: Two cohorts of 200 children each were identified, each with an age range of 10-to- 15 years, one group from 1980-85 and the more recent group …

Oropharyngeal Airway Volume Following Orthodontic Treatment: Premolar Extraction Versus Non-Extraction, Thomas Patrick Shannon

Theses and Dissertations (ETD)

Orthodontic correction of tooth size versus arch size discrepancy (TSASD) can be achieved with two distinct methods of treatment. The first involves the extraction of teeth to gain the space needed for tooth alignment. The second relies on arch expansion to gain the space needed for correction. In recent decades, arguments for and against the extraction of teeth for orthodontic purposes have become increasingly important, particularly in regards to oropharyngeal airway size. Purpose: The purpose of this study is to determine whether there is a decrease in oropharyngeal dimensions following the extraction of four premolars and subsequent orthodontic therapy. Methods: …

Oropharyngeal Airway Volume Following Orthodontic Treatment: Premolar Extraction Versus Non-Extraction, Thomas Patrick Shannon

Theses and Dissertations (ETD)

Orthodontic correction of tooth size versus arch size discrepancy (TSASD) can be achieved with two distinct methods of treatment. The first involves the extraction of teeth to gain the space needed for tooth alignment. The second relies on arch expansion to gain the space needed for correction. In recent decades, arguments for and against the extraction of teeth for orthodontic purposes have become increasingly important, particularly in regards to oropharyngeal airway size. Purpose: The purpose of this study is to determine whether there is a decrease in oropharyngeal dimensions following the extraction of four premolars and subsequent orthodontic therapy. Methods: …

Comparison Of The Efficacy Of Various Ibuprofen And Acetaminophen Regimens On The Treatment Of Post-Endodontic Pain, Erik Deyoung

Master's Theses (2009 -)

The purpose of this study was to determine the efficacy of taking ibuprofen and acetaminophen at the same time versus alternating the same medications in patients with a diagnosis of symptomatic irreversible pulpitis.

Materials and Methods: Ten patients who presented for root canal therapy with a diagnosis of symptomatic irreversible pulpitis were included in this study. The patients were randomly assigned to 2 groups. Following root canal therapy, the patients in group A were instructed to take ibuprofen 600 mg and acetaminophen 1000 mg every six hours. Patients in group B were instructed to take ibuprofen 600 mg, wait three …

Fluoride Release, Recharge, And Re-Release From Four Orthodontic Bonding Systems, Amy Bouvier

Student Theses, Dissertations and Capstones

A thesis submitted to the College of Dental Medicine of Nova Southeastern University of the degree of Master of Science in Dentistry.

Objectives: To determine the amount of initial fluoride release from four orthodontic bonding systems over a period of four weeks, and then to subject these materials to an external source of fluoride for recharge in order to measure the amount of fluoride re-release over another four-week interval. Additionally the surface morphology of these materials was analyzed under the scanning electron microscope in order to identify microscopic changes in the materials that may have occurred during the experiment. Methods: …

New High Intensity Light-Emitting Diode (Led) Curing Lights: An In Vitro Evaluation Of Increased Power Density At Reduced Curing Times, Jeff Mirrielees

MUSC Theses and Dissertations

Introduction: The purpose of this study was to evaluate two new light-emitting diode (LED) curing lights with increased power densities at reduced curing times. Methods: Ninety extracted bovine incisors were examined in vitro. The incisors were divided into six test groups and metallic adhesive pre-coated brackets were bonded using either the Valo Otho (Opal Orthodontics, Ultradent) @ 3200 mW/ cm 2 or the Ortholux Luminous {3M Unitek)@ 1600 mW/ cm 2 at curing intervals of 3-, 6-, or 12-seconds. The samples were stored for 24 hours in 37 degree Celsius water and debonded. Brackets were tested using an MTS Mini-Bionix …

Effects Of Synthetic Cortical Bone Thickness And Force Vector Application On Temporary Anchorage Device Pull-Out Strength As Related To Clinical Perspectives Of Practicing Orthodontists, Ira Rothstein

Student Theses, Dissertations and Capstones

December 2011.

A thesis submitted to the College of Dental Medicine of Nova Southeastern University of the degree of Master of Science in Dentistry.

Background: Temporary anchorage devices (TADs) provide a versatile means by which orthodontic anchorage can be established without the need for patient compliance and complex force systems. Their use is predicated on their ability to remain stable throughout the course of treatment in which they are needed. This has been shown to be the result of "primary stability" which is achieved through mechanical interlocking of the screw threads with the surrounding bone immediately upon placement. Therefore, evaluating …

Gingival Crevicular Fluid (Gcf) Levels Of Interleukin-6 (Il-6), Soluble Glycoprotein 130 (Sgp130), And Soluble Interleukin-6 Receptor (Sil-6r) During Orthodontic Tooth Movement, Mathue Gene Faulkner

UNLV Theses, Dissertations, Professional Papers, and Capstones

Introduction: Orthodontic tooth movement requires the precise coordination of a multitude of biological factors in order for proper bone remodeling to occur. Cytokines, such as Interleukin-6 (IL-6), play a critical role in the communication necessary for both bone resorption and bone apposition. IL-6 reacts with receptor proteins, such as soluble IL-6 receptor (sIL-6R), on target cells in order to transmit signals important to both osteoclast and osteoblast activities. Soluble glycoprotein 130 (sgp130), on the other hand, acts as a natural inhibitor to IL-6 activity. The purpose of this investigation was to evaluate the levels of IL-6, sIL-6R, and sgp130 …

Bacterial Adherence Of Streptococcus Mutans And Lactobacillus Acidophilus On Poly-Methyl Methacrylate And Thermoplastic Polypropene Used In Orthodontic Retention, Lindsay Ann Pfepper

UNLV Theses, Dissertations, Professional Papers, and Capstones

Retention is required in the majority of orthodontic patients throughout the remainder of their life. The two primary removable appliances are known as the traditional Hawley retainer or the vacuum formed retainer. These appliances were developed to maintain the position of the dentition without sacrificing oral health. The orthodontic population is at a higher risk for caries due to plaque accumulation from poor diet, suboptimal oral hygiene and often lack of motivation. These two retainers occupy different niches and are comprised of different materials; therefore the retainers' effect on oral health could be very different. An understanding of which bacteria …

Effect Of Toothbrush Abrasion On Frictional Resistance Of Aesthetic Orthodontic Archwires, Stephen Alexander Yamodis

UNLV Theses, Dissertations, Professional Papers, and Capstones

Fixed orthodontic appliances (braces) are one of the most widely used appliances to correct malocclusion, however many patients prefer less metal display. To meet this demand more esthetically pleasing brackets and archwires have been developed. These esthetic components are often clear, white or tooth colored. Coatings of various types are commonly used to produce an esthetic archwire. However, these coating materials tend to wear and degrade, which may cause binding and increased resistance to friction, thereby potentially reducing the efficiency of tooth movement. Therefore, in vitro testing of tooth brush abrasion on frictional resistance of various aesthetic archwires was tested. …

Practicing Orthodontists' Use And Perceived Efficacy Of Self-Ligating Brackets, John-David Beuhler

UNLV Theses, Dissertations, Professional Papers, and Capstones

Introduction.

The purpose of this study was to compare perceptions of efficacy and efficiency of Self-Ligating Brackets vs. conventional brackets between practicing Orthodontists and Orthodontic Residents.

Methods.

Cross-sectional survey research using a three-wave emailing of addresses from the current American Association of Orthodontists directory. The directors of all orthodontic residency programs in the US were asked to also distribute to all residents. The survey included five sections: (1) respondents' experience, (2) factors that influence, (3) positive or negative factors, (4) the perceived efficiency/efficacy, and (5) demographics. A 39% response rate (N=707) was obtained.

Results.

Over half (51.8%) …

Profile Attractiveness In Borderline Class Iii Surgical/Orthodontic Cases, Melina Adamian

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: This study evaluated differences between laypersons and orthodontists in rating facial attractiveness in borderline class III surgical/orthodontic cases. The purpose was to determine whether orthognathic surgery or camouflage is a better alternative for observable esthetic improvement in borderline Class III surgical/orthodontic patients. This study will aid the orthodontist in recommending treatment options to enhance profile attractiveness of borderline Class III surgical/orthodontic patients. Materials and Methods: Thirty profile images of treated borderline class III surgical/orthodontic cases were selected. Fifteen of the profile images were of cases that had been treated by orthodontics alone, and fifteen images were of cases that …

Cone-Beam Computed Tomography And Orthodontics: Awareness Assessment, Warren D. Libby

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: The purpose of this study was to evaluate a specific orthodontic community's knowledge and understanding of Cone-Beam Computed Tomography (CBCT) technology as well as awareness of the implications of CBCT use, including risk assessment, radiation dose estimation, diagnostic utility, and issues of informed consent. It is incumbent on the profession to understand how practitioners view this technology as it gains popularity and ease of use. Materials and Methods: A 21-question survey with 13 additional demographic questions was distributed to several different populations affiliated with Loma Linda University School of Dentistry: 1) undergraduate dental students, 2) students in specialty programs …

Sleeping Tongue Posture And Its Relationship To Craniofacial Morphology, Brent J. Tingey

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: There exists good consensus in the literature supporting the notion that resting tongue posture is an important factor in dental arch development and maintenance as well as airway control. What has yet to be quantitatively measured is the duration of time that a subconscious, resting tongue posture is maintained and whether such posture differs among various craniofacial morphologies. Quantifiable measurements might allow for prediction of tongue-posture-related problems specific to certain facial types. Purpose: The objective of this study was to record sleeping tongue posture over time in 27 subjects and to compare findings with craniofacial morphology determined by cephalometric …

Accuracy Of Unsegmented Cbct In Mesial-Distal Tooth Measurements, Todd Wesslen

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: Cone-beam computed tomography (CBCT) scans may be used to measure mesial-distal (MD) tooth width for orthodontic diagnosis and treatment planning. Purpose: The objective of this study was to determine if MD tooth measurements from unsegemented CBCT scans in the axial, sagittal, and coronal planes or from a panoramic reconstruction correlate and agree with respective measurements made on study models. Material and Methods: Using stone models of 30 subjects, reference MD tooth measurements were made using digital calipers. From CBCT scans, five different methods of measuring MD width were used and compared to the reference: (1) points chosen from orthogonal …

Civic Attitude And Activity Of Loma Linda University Dental Graduates, Gregory W. Olson

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: Dentistry is regarded as a profession and granted certain privileges, such as self-regulation. Associated with this status are stated and implied responsibilities which are widely debated. In recent years, dental professionalism seems to be on the decline. Evidence cited includes access-to-care issues and decreased public trust in dentists. In response, academia and professional organizations have developed curricula and statements intended to bolster professionalism. Meanwhile little is known about practicing dentists’ attitudes or participation in health-related civic matters. Objectives: This study seeks to examine the importance Loma Linda University (LLU) dental graduates place on public roles, their reported participation in …