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Orthodontics and Orthodontology Commons™
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Articles 1 - 11 of 11
Full-Text Articles in Orthodontics and Orthodontology
Distraction Of Heterotopic Bone Formed With Bmp-2 In A Rat Model: The Technique, Stacie Dawn Fenderson
Distraction Of Heterotopic Bone Formed With Bmp-2 In A Rat Model: The Technique, Stacie Dawn Fenderson
Loma Linda University Electronic Theses, Dissertations & Projects
Multiple studies have shown that ectopic bone forms when bone morphogenic proteins (for example BMP-2 and BMP-7) and a collagen matrix are surgically placed in a rat model either orthotopically or heterotopically. Bone begins to form by the 14 day, and is at it maximum calcified state by the 21st day. The purpose of this study is to observe and quantify the effect of distraction osteogenesis on the ectopic bone. First, a preliminary procedure was performed by surgically placing a titanium cage into the back of a rat just caudal to the thoracic vertebrae. The anterior corners were sutured to …
Detection Of Simulated Apical Root Resorption Using Three Cone Beam Ct Machines, Marcus Paulson
Detection Of Simulated Apical Root Resorption Using Three Cone Beam Ct Machines, Marcus Paulson
Loma Linda University Electronic Theses, Dissertations & Projects
The purpose of this study was to determine orthodontists' ability to discriminate small differences of simulated apical root resorption (SARR) on extracted teeth, using the output from three cone beam computed tomography (CBCT) machines. Twenty-four unrestored maxillary anterior teeth exhibiting normal morphology, were collected. The teeth were scanned by three CBCT machines: 1) the NewTom 3G (AFP imaging, USA), 2) the iCAT (Imaging Sciences, USA) 3) and the MicroCAT II (Siemens Medical, USA). Using a sandblaster the apical portion of each tooth was reduced in 0.5 mm increments up to a total reduction of 1.5 mm. Each root modification was …
Tooth Size Discrepancies In An Orthodontic Population, Othman S. A., Harradine N.
Tooth Size Discrepancies In An Orthodontic Population, Othman S. A., Harradine N.
Siti Adibah Othman
Objective: To explore how many millimeters of tooth size discrepancy (TSD) are clinically significant, to determine what percentage of a representative orthodontic population has such a tooth size discrepancy, and to determine the ability of simple visual inspection to detect such a discrepancy. Materials and Methods: The sample comprised 150 pretreatment study casts with fully erupted and complete permanent dentitions from first molar to first molar, which were selected randomly from 1100 consecutively treated white orthodontic patients. The mesiodistal diameter tooth sizes were measured using digital calipers, and the Bolton analysis and the tooth size corrections were calculated by the …
Quantitative Analysis Of First- Versus Second-Premolar Extraction Effects In Orthodontic Treatment, Robert A. Turner
Quantitative Analysis Of First- Versus Second-Premolar Extraction Effects In Orthodontic Treatment, Robert A. Turner
Theses and Dissertations (ETD)
Malocclusions can involve arch-size tooth-size discrepancies that have to be resolved by premolar extractions. Treatment planning in such cases usually involves removing first (P1) or second premolars (P2). Choosing an extraction pattern is a learned skill that incorporates many diagnostic factors. This study compared the amounts of in-treatment tooth movement in two common extraction patterns (4/4 and 5/5) in order to gain insight into the criteria used for differential diagnosis and treatment planning. Objective: A method of cast analysis was developed to measure the anteroposterior and transverse changes in tooth positions during orthodontic treatment. Data were used (1) to …
Cephalometric Evaluation Of One-Phase And Two-Phase Treatment Alternatives In Matched Class Ii Subjects, Fredrick Jerome Burr
Cephalometric Evaluation Of One-Phase And Two-Phase Treatment Alternatives In Matched Class Ii Subjects, Fredrick Jerome Burr
Theses and Dissertations (ETD)
“Early” or two-phase orthodontic treatment of Class II malocclusions is a highly debated topic in the orthodontic literature. We report here on a retrospective cephalometric study of patients with Class II, division 1 malocclusions. One group consisted of 32 consecutively treated patients who received “early” treatment with a Fränkel II appliance followed by treatment with full fixed appliance. These subjects were “matched” by sex and cephalometric value, to a subject treated with standard edgewise appliances in a single phase. Matching criteria focused on the bony facial characteristics, notably ANB, NAP, Y Axis, AOBO, FMA, overjet, and overbite. The question was …
Root Morphology And Sexual Dimorphism : Size Standards For Crown And Root Dimensions In Adolescents, William Max Couch
Root Morphology And Sexual Dimorphism : Size Standards For Crown And Root Dimensions In Adolescents, William Max Couch
Theses and Dissertations (ETD)
“Early” or two-phase orthodontic treatment of Class II malocclusions is a highly debated topic in the orthodontic literature. We report here on a retrospective cephalometric study of patients with Class II, division 1 malocclusions. One group consisted of 32 consecutively treated patients who received “early” treatment with a Fränkel II appliance followed by treatment with full fixed appliance. These subjects were “matched” by sex and cephalometric value, to a subject treated with standard edgewise appliances in a single phase. Matching criteria focused on the bony facial characteristics, notably ANB, NAP, Y Axis, AOBO, FMA, overjet, and overbite. The question was …
Tooth-Size Discrepancy And Bolton's Ratios: The Reproducibility And Speed Of Two Methods Of Measurement, Othman S. A., Harradine N. W.
Tooth-Size Discrepancy And Bolton's Ratios: The Reproducibility And Speed Of Two Methods Of Measurement, Othman S. A., Harradine N. W.
Siti Adibah Othman
OBJECTIVE: To determine and compare the reproducibility and speed of two methods of performing Bolton's tooth-size analysis. DESIGN: Analysis of randomly selected clinical sample. SETTING: Bristol Dental Hospital, University of Bristol, United Kingdom. MATERIALS AND METHODS: Pre-treatment study casts of 150 patients were selected randomly from 1100 consecutively treated Caucasian orthodontic patients. Bolton tooth-size discrepancies and ratios were measured using two methods; one method employed entirely manual measurement and the Odontorule slide rule, while the other employed digital calipers and the HATS analysis software. Twenty study casts were measured twice, a week apart with both methods. Another three investigators also …
Concurrent Whitening And Orthodontic Treatment, Jason Thomas Gladwell
Concurrent Whitening And Orthodontic Treatment, Jason Thomas Gladwell
Theses and Dissertations
The aim was to evaluate whether a whitening system, when used during the final stages of orthodontics, would yield results comparable to whitening alone. Patients were assigned to either the control (n=20) or experimental (n=26) groups. At T1, patients were given a ten day supply of Trèswhite⢠by Opalescence®, instructions on use, and initial shade determination was made and photographs were taken. At T2 and T3, shade determination was accomplished and updated photographs were taken. Whitening of the teeth occurred in both groups on average, but significantly more whitening was experienced in the experimental group (p < 0.004). An average of 87% of teeth whitened during orthodontic treatment compared to 97% of control teeth (p < 0.01) were judged to be uniform in appearance. In conclusion, the data do not contraindicate the concurrent accomplishment of teeth whitening during orthodontic treatment.
The Effect Of Pre-Cure Bracket Movement On The Shear Bond Strength Of Metal Brackets, Thomas Luther Roberts Iv
The Effect Of Pre-Cure Bracket Movement On The Shear Bond Strength Of Metal Brackets, Thomas Luther Roberts Iv
Theses and Dissertations
The effect on shear bond strength of bracket movement after seating the brackets and before light curing has not been reported. The purpose of this study was to determine the effect of linear and rotational pre-cure bracket movement on the shear bond strength of orthodontic brackets. 100 extracted human maxillary premolars were divided into 5 groups of 20 teeth each. The control group was bonded with no pre-cure bracket movement, and test groups were bonded with pre-cure bracket movement of 2 mm, 4 mm, 45¢ª or 180¢ª. Debonding force was measured with an Instron universal testing machine. Results were analyzed …
Overbite Correction And Smile Esthetics, Kevin Erick Kelleher
Overbite Correction And Smile Esthetics, Kevin Erick Kelleher
Theses and Dissertations
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, post-overbite correction and post-treatment records were gathered from 32 patients who presented with deep overbite malocclusions to the Virginia Commonwealth University orthodontic clinic. Both groups of patients experienced reductions in overbite and maxillary incisor display as well as maxillary and mandibular incisor proclination and mandibular incisor occlusal movement during treatment. In the intrusion arch group, the center of resistance of …
Relationship Between Facial Attractiveness And Occlusal Treatment Outcomes: A Retrospective Study, Chad Eric Fowler
Relationship Between Facial Attractiveness And Occlusal Treatment Outcomes: A Retrospective Study, Chad Eric Fowler
Theses and Dissertations
The goal of this study was to determine if a relationship exists between pretreatment facial attractiveness and posttreatment occlusal outcome in orthodontic patients. A randomized sample of forty-seven patients (26 males, 21 females) was selected for inclusion in this study. Orthodontic evaluators rated pretreatment patient photographs (frontal smile, frontal, profile) using a 100 mm visual analog scale (VAS). Occlusal outomes were evaluated using percentage reduction in weighted Peer Assessment Rating (PAR) index scores and the American Board of Orthodontics objective grading system (ABO-OGS). Spearman correlation coefficients were calculated to assess the relationship between pretreatment VAS attractiveness ratings and posttreatment occlusal …