Orthodontics and Orthodontology Commons^™

Effect Of Pad Design And Bracket Manufacturing Method On Bracket Bond Strength, Dustin Osborne

Graduate Theses, Dissertations, and Problem Reports (ETD)

Objective: The objective is to determine if there is a significant difference in shear bond strength and debonding characteristics between one-piece metal brackets made by metal injection molding (MIM) and multi-piece metal brackets made by machining then soldering/brazing with differing pad designs. Methods: A total of thirteen metal orthodontic brackets manufactured by 8 different companies were divided into two groups: one-piece MIM and multi-piece brackets. Each group consisted of 10 brackets for a total of 130 brackets. Brackets were bonded to stainless steel tubes with a universal bonding technique. Samples were tested on the universal Instron testing machine to measure …

Perceived Efficacy Of Extrusion Of Maxillary Lateral Incisors With Aligners, Mason T. Bates

Theses and Dissertations

Purpose: To assess the perceived efficacy of aligners (Invisalign, Align Technology Inc) at performing extrusive movements of maxillary lateral incisors, determine a general threshold of when a maxillary lateral incisor is not extruding as predicted and requiring intervention, evaluate the frequency and methods of intervention to achieve the predicted extrusion, and to evaluate any related differences between orthodontists and general dentists, and between clinicians having treated various numbers of patients with Invisalign in the past 12 months.

Methods: An original 18-question survey was sent by mail to a randomized and geographically proportionate selection of orthodontic specialists (N = …

Patient Perspectives On Teledentistry And Face-To-Face Doctor Interaction During Orthodontic Treatment, Jackson K. Griffeth D.M.D.

Theses and Dissertations

Purpose: Orthodontic patients were surveyed to determine the perceived value of doctor-to-patient face-to-face interaction, the desire for convenience and attitudes toward specific uses of teledentistry.

Methods: Participating private practice orthodontists emailed the survey to active patients. 75 self-pay patients from VCU Orthodontic clinic were also invited to complete the survey. Patients 18 years or older were asked to complete the survey regarding their own treatment. Parents of patients under age 18 were asked to complete a separate survey regarding their child’s treatment. Questions asked patients about the importance of face-to-face interaction with their orthodontist and their preferences for the inclusion …

Effects Of Local Versus Systemic Administration Of Cxcr4 Inhibitor Amd3100 On Orthodontic Tooth Movement In Rats, Narubhorn Ongprakobkul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Chemokines play pivotal roles in orthodontic tooth movement (OTM) through osteoclast-mediated bone resorption, but the underlying mechanism remains unclear. We aimed to elucidate the effects of serial local vs systemic administration of the chemokine receptor CXCR4 antagonist AMD3100 on OTM. The maxillary right first molar (M1) of rats was moved mesially using a 10 g of force nickel-titanium coil spring. The injections were performed every other day with phosphate-buffered saline as a control, whereas local and systemic animals were injected with AMD3100 at the buccal palatal mucosa adjacent to M1 and subcutaneously, respectively. OTM distance and alveolar bone were examined …

Differences Of Sound And Morphology In Skeletal Class Iii Patients, Natthaporn Pravitharangul

Chulalongkorn University Theses and Dissertations (Chula ETD)

[Background] This study aimed to explore differences in vowel production using acoustic analysis in skeletal Class III and Class I Japanese participants, and to investigate the correlation between vowel sounds and cephalometric variables in skeletal Class III subjects. [Materials and Methods] Japanese males with skeletal Class III (ANB<0°) and Class I skeletal relationships (0.62°

The Designs Of Miniscrew-Assisted Transpalatal Arch Affect Molar Intrusion, Ornnicha Pooktuantong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Abstract: An anterior open bite is one of the most difficult malocclusions in orthodontic treatment. For such malocclusion, orthodontic miniscrews insertion into both buccal and palatal alveolar regions has been indicated for molar intrusion, but it involves a risk of tooth root injury. To solve the problem, midpalatal miniscrew-attached extension arm (MMEA) is adopted. However, this method causes palatal tipping of the molar because intrusive loads were applied only from palatal side. Currently, transpalatal arch is added to avoid tipping movement, but it induces patient's discomfort. Hence, the objective of this study was to evaluate the loading conditions for maxillary …

Effects Of Intrauterine Intermittent Hypoxia On Skeletal Muscle In Offspring Rats, Wirongrong Wongkitikamjorn

Chulalongkorn University Theses and Dissertations (Chula ETD)

Gestational intermittent hypoxia (IH), a hallmark of OSA, alters the offspring's respiratory neural control and diaphragm contractile function. Thus, we aimed to investigate the effects of gestational IH on the muscle development and metabolism of geniohyoid (GH), which is innervated by the respiratory-related hypoglossal nerve and plays a role in tongue traction and suckling, in male offspring rats compared with masseter (MAS), the largest masticatory muscle. Pregnant Sprague-Dawley rats were exposed to IH (3-min periods of 4–21% O2) compared to Normoxia for 8 hours/day during gestational days 7–20. GH and MAS from 35-day-old male offspring (n = 6 /group) were …

Validation Of A Screening Tool For Pediatric Obstructive Sleep Apnea: A Pilot Study, Julia A. Giardina

Theses and Dissertations

Purpose: The purpose of this study was to evaluate the Pediatric-Modified-STOP-Bang (PM-STOP-Bang) as a screening tool to assess sleep related breathing disorders (SRBD) within a pediatric population. The specific aims of this study were: 1) compare the PM-STOP-Bang scores with those from the validated Pediatric Sleep Questionnaire (PSQ), 2) determine the ability of the PM-STOP-Bang and the PSQ screening tools to accurately detect children of high risk for SRBD from a one-night home sleep apnea test (HSAT).

Methods: Orthodontic patients were screened using the PM-STOP-Bang at VCU Graduate Clinic. Patients (n=10) who were recruited and enrolled. Five were determined to …

Reproducibility And Accuracy Of The Virtual Occlusal Record, Anne M. Harper

Theses and Dissertations

Purpose: To evaluate the reproducibility and accuracy of the virtual occlusal record compared to the gold standard physical bite record

Methods: Two physical bite records of PVS and two virtual bites using an iTero Element scanner were obtained from 22 participants. Intraoral scans were exported as STL files, and virtual occlusal records were created. CBCT images were taken of physical occlusal records and converted to STL files. STL files were superimposed using Geomagic Control X™ Software. Root mean square (RMS) and percent similarity within 0.25 mm tolerance were compared at a significance level of 0.05.

Results: Average …

An In Vitro Comparison Of Shear Bond Strength Between Two Orthodontic Light-Curable Adhesive Pastes, Stephanie Becker

Graduate Theses, Dissertations, and Problem Reports (ETD)

Background and Objectives: A relatively new light-cure orthodontic adhesive BracePaste^® can fluoresce under UV light to assist in cleaning up excess flash after bonding. Complete removal of excess resins around the bonded brackets may minimize excessive loss of enamel upon debonding. The objective of this study was to determine the shear bond strength of BracePaste compared to that of the conventional “Transbond XT” adhesive. Additionally, enamel and bracket interfaces were examined to determine the location of bond failure and the tooth surfaces were visually examined to assess severity of enamel marks and the presence of remaining adhesives on the …

Evaluation Of Dental And Skeletal Changes With Sequential Distalization Of Maxillary Molars Using Clear Aligners: A Preliminary Study, Minh Phi Nguyen

Graduate Theses, Dissertations, and Problem Reports (ETD)

Introduction: Class II malocclusions can be treated with appliances such as the pendulum appliance or distal jets to distalize maxillary molars to achieve a Class I molar relationships. It is not clear in the literature whether these clear aligners can distalize maxillary molars, dental tipping, or translation. The objective was to evaluate the dental and skeletal changes in three planes spaces using CBCT scans and compare the treatment changes with a control group of subjects. Methods: Eight Class II division 1 malocclusions patients treated with maxillary molar distalization using clear aligners. Twelve molars were evaluated for tooth movement in three …

Trimming And Ph Effects On Nickel Ion Release From Stainless Steel Crowns Of Primary Teeth, Milad Arab-Nozari, Mohammad Shokrzadeh, Nastaran Zamehran, Jamshid Yazdani Charati, Azam Nahvi

Journal of Dentistry Indonesia

Objective: Stainless steel crowns (SSCs) are preformed metal crowns used to restore severely decayed primary teeth. The aim of this study is to evaluate the effects of pH changes and SSC margin trimming on nickel release in artificial saliva solution. Methods: A total of 90 SSCs were divided into three groups and placed in 35 ml of artificial saliva of pH 6.8, 5, and 3.5. Another group consisting 30 SSCs with trimmed margins was placed in saliva of pH 6.8. All SSCs were incubated at 37°C. The concentration of released nickel was assessed on days 1, 7, 14, 21, and …

Evaluation Of Maxillary Impacted Teeth And Their Relationship With Adjacent Teeth And Anatomic Structures With Cone Beam Computed Tomography, Emre Köse, Emin Murat Canger

Journal of Dentistry Indonesia

Objective: This study aimed to examine the cone beam computed tomography (CBCT) images of impacted maxillary canines and mesiodentes. Methods: This retrospective radiographic study was performed on 177 patients with 200 impacted maxillary canines and 12 mesiodentes. Using CBCT images, the unilateral/bilateral occurrence, presence of root dilaceration, mesio-distal and buccopalatal location, impaction condition, contact region of adjacent teeth, presence and degree of root resorption of adjacent teeth, dental follicle width, closest distance to the nasal cavity, nasopalatinal canal, and maxillary sinus were assessed. For mesiodentes, the types, follicle width, direction, and relationship with anatomical structures were evaluated. Results: No statistical …

Effect Of Craniofacial Growth Pattern On Head Posture, Burak Kale, Muhammed Hilmi Buyukcavus

Journal of Dentistry Indonesia

Head posture refers to the upright position of the head of a standing or sitting subject. The literature reports that head posture is affected by many factors. Objective: To evaluate differences in head posture according to craniofacial growth pattern. Methods: A total of 163 individuals (83 females and 80 males) were included in this study. Patients were divided into three groups according to ANB angle as Class I, Class II, and Class III, and each group was divided further into three subgroups according to SN/GoGn angle as hyperdivergent, normodivergent, and hypodivergent. The patients were compared in terms of head posture …

Comparative Evaluation Of Apical Extrusion Debris And Irrigant During Calcium Hydroxide Removal And Endodontic Instrumentation Using Three Types Of Instrumentation Systems, Selen İnce Yusufoğlu, Esma Saricam

Journal of Dentistry Indonesia

Many root canal preparation techniques and instruments produce apically extruded materials to a certain extent depending on the preparation system adopted. The extrusion of debris from the apical foramen during chemomechanical preparation may cause postoperative pain and failure of endodontic treatment. Objective: This study evaluates the differences in the apical extrusion of debris and calcium hydroxide (CH) during endodontic instrumentation by using Reciproc Blue (RB), WaveOne Gold (WOG), and F6 Skytaper (F6). Methods: Six experimental study groups (n = 13) were established. The root canal procedures for all groups were prepared with different methods: Group I: One Shape (OS) instrumentation, …

Reliability Of Panoramic Radiography For Vertical Facial Pattern Assessment, Waqar Jeelani, Maheen Ahmed, Shakeel Ahmed

Journal of Dentistry Indonesia

The orthopantomogram (OPG) is a common dental screening radiograph that has multiple implications. However, lateral cephalogram is the investigation of choice for the assessment of vertical facial pattern. Objective: The aim of the current study was to investigate the validity of an OPG parameter i.e. panoramic gonial angle (PGoA) for the assessment of the vertical facial pattern. Methods: A cross-sectional study was conducted on the pretreatment OPG and lateral cephalograms of 200 orthodontic patients aged 15-40 years. The PGoA was measured on both sides and an average was used for statistical analysis. The Pearson’s correlations of PGoA were measured with …

Effect Of Salivary Ph On Water Absorption And Solubility Of Enhanced Resin- Modified Glass Ionomer, Yosi Kusuma Eriwati, Muhammad Dhiaulfikri, Ellyza Herda

Journal of Dentistry Indonesia

The influence of immersion period and liquid pH on water absorption capacity and solubility of the resin-modified glass ionomer cement (RMGIC) raises the question of whether the critical pH of hydroxyapatite and fluoroapatite influences the water absorption capacity and solubility of enhanced resin-modified glass ionomer (ERMGI). Objective: This study was designed to investigate the effects of immersion periods and various pH levels of artificial saliva on the water absorption and solubility of RMGIC and ERMGI. Methods: Fifty-four disc-shaped specimens (15 mm x 1 mm) of enhanced RMGI (ACTIVATM BioACTIVE-RESTORATIVE, Pulpdent, Watertown, MA, USA) and 54 disc-shaped specimens (15 mm x …

Inflammatory Cytokine Expression Of Immune Cells On Exposure To Invisalign® Material: An In Vitro Pilot Study, Alaina M. Allen

Theses & Dissertations

The purpose of this study is to characterize the inflammatory cytokines that are expressed in peripheral blood mononuclear cells (PBMCs) and THP-1 monocytes exposed to Invisalign^® aligner material in vitro. Invisalign^® material was ground into particles, soaked in artificial saliva, and the eluate was collected. Commercially available cryopreserved pooled and individual human PBMCs and THP-1 monocytes were cultured with Invisalign^® material eluate and positive (lipopolysaccharide) and negative controls. The supernatants were collected and used with a BioLegend LEGENDplex^™ multi-analyte flow assay, a sandwich enzyme-linked immunosorbent assay (ELISA), to identify the expression of TNF-α, IL-6, IL-8, IL-10, …

Stress Relaxation In Orthodontic Aligner Plastics; An In Vitro Comparison Study, Kristopher J. Keller

Theses & Dissertations

The purpose of this study was to ascertain if repeated stresses from extension cycling would result in accumulated damage in aligner materials and affect force delivery. A secondary goal was to identify potential differences in mechanical behavior present among orthodontic aligner polymers. Four thermoplastic polymers (Essix ACE, Taglus, Zendura, and Zendura FLX) were thermoformed, cut into strips, and extension cycled to 0.4 millimeters in a 37C water bath. Force decay, maximum and minimum force, and elastic modulus were measured during cycling. Additional samples were subjected to controlled tension until failure, allowing the measurement of yield strength, ultimate strength, and elastic …

Outcomes Of Unilateral Alveolar Clefts Grafted Using Recombinant Human Bone Morphogenetic Protein-2: A Retrospective Volumetric Analysis Using Cbct, Landon Robert Peterson

Theses & Dissertations

Purpose of this study is to evaluate the success rates of secondary alveolar grafts using recombinant human bone morphogenetic protein with CBCT and to evaluate the effects of several variables on these outcomes. After our inclusion/exclusion criteria, records of 24 patients receiving secondary alveolar grafts at the University of Nebraska Medical Center were evaluated. Pre-graft and 6-month post-graft cleft volumes were measured using ITK-SNAP 3.8.0 software to determine a percent residual defect following surgery. Of the 24 patients, one was excluded as the graft surgery was deemed a failure. The patients’ gender, age, side of cleft, cleft side canine root …