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1
Miller, Kevin Blaine. "A comparison of treatment impacts between invisalign and fixed appliance therapy during the first seven days of treatment." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010291.
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Thesis (Ph.D.)--University of Florida, 2005.Typescript. Title from title page of source document. Document formatted into pages; contains 36 pages. Includes Vita. Includes bibliographical references.
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Durrett, Sharon Jeane. "Efficacy of composite tooth attachments in conjunction with the invisalign tm system using three-dimensional digital technology." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0004566.
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Thesis (M.S.)--University of Florida, 2004.Typescript. Title from title page of source document. Document formatted into pages; contains 35 pages. Includes Vita. Includes bibliographical references.
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Terrana, Nicholas Ralph. "Orthodontist and General Practitioner Perceptions of Invisalign Treatment Outcomes." Master's thesis, Temple University Libraries, 2019. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/578670.
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Oral BiologyM.S.
Objectives: Little is known about the treatment standards and expectations of Invisalign treatment outcomes between orthodontists and general practitioners (GP). The objective of this qualitative research project was to explore how orthodontists and GPs perceive Invisalign treatment outcomes, and to determine which criteria they use to judge successful treatment. Methods: Open-ended interviews were conducted with three orthodontists and two GPs. These interviews were recorded, transcribed, coded and analyzed by the conventional phenomenological qualitative research protocol. Each clinician selected four Invisalign cases that they treated and perceived as successful outcomes. To augment qualitative methods, quantitative data were generated to determine pre-treatment Discrepancy Index (DI) and post-treatment Objective Grading System (OGS) scores as calculated by OrthoCAD software. Results: Independent sample T-tests showed no significant difference in total DI score (p=0.287) and total OGS score (p=0.840) between the orthodontist (n=12) and GP (n=7) cases. Orthodontists perceive incisor torque and smile esthetics as important criteria for successful Invisalign outcomes. In contrast, GPs do not. Orthodontists and GPs unanimously perceive that Class I occlusion is an important criterion for successful treatment. GPs perceive extraction cases as a challenge to obtain successful outcome with Invisalign whereas, orthodontists do not. Conclusions: Differences exist between orthodontist and GP perceptions of what constitutes successful Invisalign treatment. Currently employed standards of excellence can be found in a wide spectrum of finishes; however, they are incapable of defining the excellence of finish. Selective standards differentiate the GPs from orthodontists, but agreement exists for ambition to finish in Class I occlusion. Esthetics and torque are valued higher by the orthodontists than are by the GPs. The utility of current standards- of-care need to be questioned and redefined.
Temple University--Theses
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Minor, Valerie Jean Vonnoh. "Effects of preoperative ibuprofen, anxiety, and gender on post-separator placement pain." [Gainesville, Fla.] : University of Florida, 2004. http://etd.fcla.edu/UF/UFE0014296/minor_v.pdf.
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Thesis (M.S.)--University of Florida, 2006.Typescript. Title from title page of source document. Document formatted into pages; contains 34 pages. Includes Vita. Includes bibliographical references.
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Marris, Curtice Kary. "Effects of preoperative ibuprofen, anxiety and gender on post separator placement pain." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0004879.
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Thesis (M.S.)--University of Florida, 2004.Typescript. Title from title page of source document. Document formatted into pages; contains 31 pages. Includes Vita. Includes bibliographical references.
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Albert, Jeremy M. "Clinical evaluation of the Prophy-Jet in routine plaque debridement of orthodontic patients." [Gainesville, Fla.]: University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000627.
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Montini, Reid W. "Perceptions of orthognathic surgery patients' change in profile a five year follow-up /." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010492.
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Thesis (M.S.)--University of Florida, 2005.Typescript. Title from title page of source document. Document formatted into pages; contains 30 pages. Includes Vita. Includes bibliographical references.
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Weltman, Belinda Jessica. "Root resorption associated with orthodontic tooth movement a systematic review /." Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1236022079.
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Brazeau, Lisamarie O. "Cephalometric analysis of posttreatment changes in class ii division 1 patients treated in either one or two phases." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0004880.
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Thesis (M.S.)--University of Florida, 2004.Typescript. Title from title page of source document. Document formatted into pages; contains 31 pages. Includes Vita. Includes bibliographical references.
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Vakani, Arvind Kenneth. "Effect of nitric oxide (NO) on orthodontic tooth movement in rats." [Gainesville, Fla.]: University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000811.
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Pavlow, Sarah Stanley. "Effect of early treatment on stability of occlusion in patients with a class ii malocclusion." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010440.
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Thesis (M.S.)--University of Florida, 2005.Typescript. Title from title page of source document. Document formatted into pages; contains 30 pages. Includes Vita. Includes bibliographical references.
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Lee, Paul Chong Chan. "A QUALITATIVE AND QUANTITATIVE ANALYSIS OF SOFT TISSUE CHANGE EVALUATION BY ORTHODONTISTS IN CLASS II NON EXTRACTION ORTHODONTIC TREATMENT USING THE 3dMD SYSTEM." Master's thesis, Temple University Libraries, 2013. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/217032.
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Oral BiologyM.S.
With the advent of cephalometrics in the 1930s, numerous studies have focused on the profile of a face to achieve a more esthetic orthodontic treatment outcome. With such heavy emphasis on facial esthetics, a shift in focus from the profile view to the oblique view has become necessary as the smile in the oblique view is what the general public evaluates. The purpose of this pilot study was to determine whether the current tools for diagnosis and treatment evaluation are sufficient. Currently, 2-dimensional composite photographs are utilized in evaluating the soft tissue. At Temple University, 3-dimensional images, which show all sides of the patient's face, are used adjunctively to 2-dimensional composite photographs. In this study, faculty members at the Temple University Department of Orthodontics were asked to complete surveys after viewing two different image modalities, 2-dimensional images and a 3-dimensional video of the same patient. They were asked to fill out the soft tissue goals for specific facial landmarks. Patient photos were in the smiling view as current literature lacks studies on this view. Faculty members' responses from analyzing the 2-dimensional images and 3-dimensional video for each patient were compared to determine which areas had frequent discrepancies from using two different image modalities. During the survey, a voice recorder captured any comments regarding the images. The ultimate goal of this qualitative pilot study was to identify when 3-dimensional imaging is necessary in treatment planning and evaluation, with an added hope to further advance research in 3-dimensional imaging and its vast possibilities to advance the field of orthodontics. Based on the data collected, the following conclusions were made: 1. The qualitative data highlighted that 3-dimensional imaging would be necessary in cases with skeletal deformities. 2. In the oblique view, 3-dimensional imaging is superior than 2-dimensional imaging by showing more accurate shadow, contour, and depth of the soft tissue. 3. Further improvement is necessary to create a virtual patient with treatment simulation abilities. 4. The comfort level among orthodontists of 2-dimensional imaging was higher than 3-dimensional imaging. With more widespread use of 3-dimensional imaging, more orthodontists may gradually reach a higher comfort level in using this relatively new technology. 5. Faculty members expressed high willingness to use 3-dimensional imaging if improvement in new technology could allow for more manipulation and accurate soft tissue prediction. 6. 3-dimensional imaging is superior in its efficiency, quick capture time, and lack of need for multiple images. Implementation of 3-dimensional imaging could streamline the records process and help with practice efficiency without compromising the image quality. 7. Both patients and orthodontists may benefit from using 3-dimensional imaging. Patients can see an accurate representation of themselves and possibly view their own treatment simulation upon further improvement in current technology. Orthodontists would benefit with much more accurate images that may serve as the virtual patient. 8. Besides the exorbitantly high cost, faculty members thought that more advances were needed and the current benefit was not great enough to justify the investment. The results were consistent with other studies that used the oblique view in that the 2-dimensional oblique view lacks depth and does not provide adequate information. With further improvement in current 3-dimensional imaging, this technology can benefit orthodontists in visualizing their patients. In addition, patients can benefit by hopefully seeing a live and accurate simulation of themselves instantly as a virtual patient. With these benefits of 3-dimensional imaging, it may one day be the new standard in patient records in the field of orthodontics.
Temple University--Theses
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Hasanat, Watraat Unmona. "Utilization of a new web-based application for case difficulty assessment as a predictor for procedural errors in nonsurgical root canal treatment." Scholarly Commons, 2021. https://scholarlycommons.pacific.edu/dugoni_etd/15.
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Introduction: There are currently no established guidelines to determine which cases general practitioners should refer to an endodontist for root canal treatment. The American Association of Endodontists (AAE) has developed the EndoCase mobile application (ECA), which utilizes either a full or abridged rubric to assign case difficulty level and provide referral guidelines to general practitioners and dental students. Objective: The objective of this study was to determine whether the abridged criteria of the EndoCase application can help predict the incidence of procedural errors in nonsurgical root canal treatment of mandibular molars in an undergraduate dental clinic based on the difficulty level. Methods: A list of patients who received primary root canal treatment on mandibular first molars in the undergraduate dental clinic from 2015-2020 was obtained. Ninety patients qualified for inclusion. Case difficulty level was assessed using the ECA by three providers with differing levels of experience. Incidence of procedural errors was determined from post-operative radiographs by two calibrated independent observers. Results: The most common endodontic mishaps were errors during access cavity preparation followed by the presence of voids in the root filling, with an incidence of 54.4% and 45.6%, respectively. There were no significant differences regarding case difficulty level and the incidence of total procedural errors nor number of treatment visits. Of the individual error types, the presence of obturation >2mm short of the radiographic apex was weakly correlated with case difficulty level (r = 0.226, pConclusion: There is minimal correlation between the difficulty level of mandibular molars determined by the ECA and the number of treatment visits or overall incidence of procedural errors.
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Pua, Shih Chia. "A review of multiple hypothesis testing in relation to the use of lateral cephalometric variables as the outcome measure in orthodontic research." Thesis, University of Liverpool, 2018. http://livrepository.liverpool.ac.uk/3028585/.
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Aim: To examine the extent of the multiple hypothesis testing and its correction in orthodontic research in relation to the use of lateral cephalometric variables as the outcome measure. Study design: A retrospective, observational study looking at a sample of published orthodontic articles (n=1688) over a two-year period from 1st January 2014 to 31st December 2015. Data sources: Four major electronic databases namely PubMed, Ovid Medline, Scopus and EBSCO Dentistry & Oral Sciences Source were electronically searched using Medical Subject Heading (MeSH) terms. Additionally, all issues of American Journal of Orthodontics and Dentofacial Orthopedics (AJODO), The Angle Orthodontist (AO), European Journal of Orthodontics (EJO) and Journal of Orthodontics (JO) were also hand-searched systematically. Both searches were carried out independently by first author (SCP). Review methods: Eligible articles were identified and reviewed independently by first author (SCP) to determine whether the articles tested greater than five hypotheses in at least one family of inferences with respect to the predetermined criteria. For articles meeting the criterion for multiple testing, type I error rates were calculated. Additionally, a statistical correction experiment using Bonferroni's method was applied to the reported results of the included studies. Additional information was collected on: study type (prospective/retrospective), journal classification (main/non-main orthodontic journal were classified based on 2015 SCImago Journal and Country Rank), region of authorship (Americas, Europe and Asia/others), number of researcher in the publication (1-4, 5-7 and 8 or more) and involvement of a statistician to examine whether these factors were associated with multiple testing correction. Results: Of the 139 studies associated with multiple testing, there was approximately 3 families of tests (per article) with an average of 20 hypothesis tests (range 5-47) using lateral cephalometric variables as the outcome measure (per family of tests). Only 40 publications (29%) considered the effect of multiple testing that these studies in some way have corrected or accounted for multiple testing. Within the studies that have not accounted for multiple hypothesis testing, there was a mean 58% chance of committing a type I error and, on average, 13% of the significant results were likely to be false positives. After the application of the Bonferroni's method in the correction experiment, only 47% of the significant results reported within the articles that remained significant. Studies published in the main orthodontic journals (AJODO, EJO, JO and KJO) were more likely to account for multiple testing (p=0.002). Handsearching was superior than electronic searching with 10% of papers (n=5) which were missed from electronic searching. Conclusions: Multiple testing is common in the orthodontic research especially in relation to the use of multiple cephalometric variables as the outcome measure. This study demonstrates that the risk of false positive findings is considerably high and only a minority of the articles that have in some way corrected or accounted for multiple testing. Therefore, this multiplicity issue in relation to the use of multiple cephalometric variables in a cephalometric study deserves a closer attention from researchers, reviewers and readers.
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Li, Shuning. "Three-dimensional image analysis for quantification of tooth movements and landmark changes." 2013. http://hdl.handle.net/1805/3754.
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Indiana University-Purdue University Indianapolis (IUPUI)Quantification of treatment outcomes (tooth displacement and bony changes) is the key to advance orthodontic research and improve clinical practices. Traditionally, treatment outcome were quantified by using two-dimensional (2D) cephalometric analysis. However, there are problems inherent in 2D analysis, such as tracing errors and inability to detect side-effects. Thus, a reliable three-dimensional (3D) image analysis method for treatment outcome quantification is of high interest. Systematic 3D image analysis methods were developed for digital dental cast models and Cone-Beam Computed Tomography (CBCT) models. A typical analysis procedure includes image reconstruction, landmarks identification, coordinate system setup, superimposition, and displacement or change calculation. The specified procedures for maxillary teeth displacements and anatomical landmarks movements were presented and validated. The validation results showed that these procedures were accurate and reliable enough for clinical applications. The 3D methods were first applied to a human canine retraction clinical study. The purposes of this study were to quantify canines and anchorage tooth movements, and to compare two commonly used canine retraction strategies, controlled tipping and translation. The canine results showed that (1) canine movements were linear with time; (2) the initial load system was not the only factor that controlled the canine movement pattern; and (3) control tipping was significantly faster than translation. The anchorage tooth results showed that (1) anchorage losses occurred even with transpalatal arch (TPA); (2) there was no significant difference in anchorage loss between the two treatment strategies; and (3) compared with removable TPA, fixed TPA appliance can significantly reduce the amount of anchorage loss in the mesial-distal direction. The second clinical application for the 3D methods was a mandibular growth clinical trial. The purposes of this study were to quantify skeletal landmark movements, and compare two widely used appliances, Herbst and MARA. The results showed that (1) the Herbst appliance caused mandibular forward movement with backward rotation; and (2) the treatment effects had no significant differences by using either Herbst or MARA appliances. The two clinical applications validated the methods developed in this study to quantify orthodontic treatment outcomes. They also demonstrated the benefits of using the 3D methods to quantify orthodontic treatment outcomes and to test fundamental hypotheses. These 3D methods can easily be extended to other clinical cases. This study will benefit orthodontic patients, clinicians and researchers.
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Lin, Jian-Cheng, and 林建誠. "The Research on Spatial Motion of Orthodontics Digital Data." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/02571721375674815006.
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碩士崑山科技大學
機械工程研究所
100
First procedure in the the traditional dentures production process making dentures is completed and has been translated into a plaster mold of the model obtained from the patient''s mouth, then after manually processing this plaster model into a compliant base size, shape andimplanted with a plaster model of the nail, and then continue to follow-up the procedures.As a lot of manpower and time spent in this program. Occlusal dental clinic crown, dental bridge making is a very important tool, as well as the orthodontic physician can calculate the size of the teeth on the model, the space requirements of the analysis, and simulation of the upper and lower jaw occlusion, and then set the best the treatment plan. As has become the trend of the development of computer-aided design, the use of digitized information for treatment planning physicians and patients a bridge. The purpose of this study is to construct a set of digital technology tooth mold occlusion and treatment planning software in this paper to assist physicians 3D digital tooth mold bite and correction planning to meet the clinical demand.
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Favor, Trevor. "Validation of an artificial tooth-periodontal ligament-bone complex for in-vitro orthodontic research." Thesis, 2015. http://hdl.handle.net/1805/7967.
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Indiana University-Purdue University Indianapolis (IUPUI)Orthodontics research investigates the methods in which tooth displacement may be directed in the tooth-periodontal ligament-bone-complex. In the biological environment, the periodontal ligament is the soft tissue responsible for the absorption of forces on teeth and has a direct connection to tooth mobility. Current research is limited in that it must be conducted in an in-vivo capacity. A major advancement in orthodontics research would be a testing method that allows for the development and analysis of orthodontic devices without a patient present. This study outlines the development and testing methods for the validation of an artificial periodontal ligament to be used in conjunction with an artificial-tooth-periodontal ligament-bone-complex. The study focused on finding the criteria in which consistent results were produced, the mixture that best simulated the human periodontal ligament’s mechanical behavior, and the robustness of the artificial-periodontal ligament-bone-complex. This study utilized a geometrically accurate denture mold filled with varying compositions of an artificial periodontal ligament for testing. Experiments focused on findings of viscoelasticity, curing times, and instantaneous responses of the teeth under direct orthodontic loading, as well as the changes in response from different teeth within the denture mold. Tests confirmed that a mixture composed of 50\% Gasket Sealant No. 2 and 50\% RTV 587 Silicone produced a substance that could adequately serve as an artificial periodontal ligament.
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Favor, Trevor E. "Validation of an artificial tooth-periodontal ligament-bone complex for in-vitro orthodontic research." Thesis, 2015. http://hdl.handle.net/1805/7967.
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Indiana University-Purdue University Indianapolis (IUPUI)Orthodontics research investigates the methods in which tooth displacement may be directed in the tooth-periodontal ligament-bone-complex. In the biological environment, the periodontal ligament is the soft tissue responsible for the absorption of forces on teeth and has a direct connection to tooth mobility. Current research is limited in that it must be conducted in an in-vivo capacity. A major advancement in orthodontics research would be a testing method that allows for the development and analysis of orthodontic devices without a patient present. This study outlines the development and testing methods for the validation of an artificial periodontal ligament to be used in conjunction with an artificial-tooth-periodontal ligament-bone-complex. The study focused on finding the criteria in which consistent results were produced, the mixture that best simulated the human periodontal ligament’s mechanical behavior, and the robustness of the artificial-periodontal ligament-bone-complex. This study utilized a geometrically accurate denture mold filled with varying compositions of an artificial periodontal ligament for testing. Experiments focused on findings of viscoelasticity, curing times, and instantaneous responses of the teeth under direct orthodontic loading, as well as the changes in response from different teeth within the denture mold. Tests confirmed that a mixture composed of 50\% Gasket Sealant No. 2 and 50\% RTV 587 Silicone produced a substance that could adequately serve as an artificial periodontal ligament.
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Jiang, Feifei. "Understanding mechanical environment changes and biological responses to canine retraction using t-loop." Thesis, 2015. http://hdl.handle.net/1805/7933.
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Indiana University-Purdue University Indianapolis (IUPUI)Predictability of tooth displacement in response to specific orthodontic load system directly links to the quality and effectiveness of the treatment. The key questions are how the tooth’s environment changes in response to the orthodontic load and how the biological tissues respond clinically. The objectives of this study are to determine the mechanical environment (ME) changes and to quantify the biological tissues’ response. Eighteen (18) patients who needed maxillary bilateral canine retractions were involved in the study. A method was developed to quantify the 3D load systems on the canine, which allowed the treatment strategies to be customized in terms of orthodontic loading systems to meet either translation (TR) or controlled tipping (CT) requirement. Dental casts were made before and after each treatment interval, and the Cone Beam Computed Tomography (CBCT) scans were taken prior to and following the entire treatment for control of treatment strategy and post treatment evaluations. Finite element method (FEM) was applied to calculate the location of center of resistance (CRes) for tooth movement control. The location and variation of CRes were recorded and compared with previous studies. A quick CRes assessment method that locates CRes by calculating the centroid of the contact surface (CCS) and the centroid of the projection of root surface (CPCS) in certain direction was also tested and compared with the results from FEM. Customized T-loop spring, a kind of orthodontic appliance, was designed, fabricated, and calibrated on a load measuring system to ensure that the load met the clinician’s prescription. The treatment outcomes in terms of tooth displacement and root resorption characterized by the changes of tooth length and volume as well as the bone mineral density (BMD) represented by the Hounsfield units (HU) change were recorded and analyzed. The ME in terms of stress were also calculated by using FEM. Paired t-test and mixed model ANOVA methods were used to analyze the relationships between the mechanical inputs (quantified and customized load, and corresponding stress) and clinical outcomes (root resorption and BMD change). It was found that the overall root resorption is not significant for canine retraction, but apical root resorption does occur, meaning that orthodontic load is not a sufficient factor. Also, it was observed that HU distribution changed significantly in both root and alveolar bone. The maximum reduction was on the coronal level in the direction perpendicular to the direction of movement in root, and in the direction of the tooth movement at the coronal level in bone. In addition, it was determined that the locations of the CRes in the MD and BL directions were significantly different. The locations of the CRes of a human canine in MD and BL directions can be estimated by finding the CPCSs in the two directions. Finally, it was shown that the stress invariants can be used to characterize how the osteocytes feel when ME changes. The stress invariants in the alveolar bone are not significantly affected by different M/F. The higher bone modeling/remodeling activities along the direction of tooth movement may be related to the initial volumetric increase and decrease in the alveolar bone.
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Laher, Ashraf. "Effectiveness of manual toothbrushes in patients with fixed orthodontic appliances." Diss., 2000. http://hdl.handle.net/2263/26190.
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Brown, Jacqueline D. "The development of the oxytalan fiber system in the mouse periodontal ligament a thesis submitted in partial fulfillment ... in orthodontics ... /." 1985. http://books.google.com/books?id=KYY9AAAAMAAJ.
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Hoenie, David C. "The effect of interocclusal repelling magnets in a bite opening splint on the growth of the craniofacial complex in juvenile Macaca mulatta a thesis submitted in partial fulfillment ... orthodontics ... /." 1986. http://books.google.com/books?id=5KY9AAAAMAAJ.
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Chiu, Yu-Fen, and 邱于芬. "Research on Functional of Orthodontic Attachment." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/5926wz.
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碩士臺北醫學大學
醫療器材產業碩士專班
105
Recent advances in orthodontic research have prompted the development of digital dental therapies, using computer aid design technique compare with 3D printing modeling makes tradition orthodontic braces has a chance to evaluate into transparent plates, as known as invisible braces. Invisible braces not only improve the appearancewhile wearing bracesbut cause less pain to patient,even more invisible braces cause less scratchesbecause of its smooth surface and thin thickness.However, the treatment on invisible braces may be too long forpatient, because ofthe pulling force in some cases may not be enough. To overcome these problems, we aim to add an attachment on patient’s toothto support braces as a fulcrum for increasing turning force in the treatment. Location, shape and size of attachmentmay cause different effective during the whole treatment, in case the design of attachment becomes a big issue in invisible orthodontic treatment. The aim of this study is to evaluate the effect on orthodontic attachment in different size and shape by use finite element analyzing assay to simulatethe stress and displacement that how different shape of attachments effect to orthodontic treatment under horizontal, vertical and oblique force, and try to find out the best designof invisible brace.
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Chang, Hsing-Wen, and 張馨文. "Research on the bone density change during orthodontic treatment." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/89516327714535839151.
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碩士中國醫藥大學
牙醫學系碩士班
98
In orthodontic theory, the ideal occlusion can be achieved by bone remodeling during orthodontic treatment. In the previous studies, most of them are histological studies on animal or human bone blocks. In the recent years, Finite Element Method (FEM) has adopted to show the details of bone remodeling during orthodontic treatment, however, none of them can exactly prove the real bone biology in the human body. In this study, we used dental cone beam computed tomography (CBCT) to evaluate the bone biology during orthodontic treatment. The most advantage of CBCT is that its radiation dose is much less than that of computed tomography. Therefore, we can get the bone density data in 7 months to analyze the bone density variations during orthodontic treatment. The purposes of this study were (a) to measure the variations of bone density before and after the orthodontic leveling and alignment, and (b) to find the correlation between the bone density and direction of tooth movement. Eight patients were selected from the Department of Orthodontics, China Medical University Hospital, Taiwan in this study. Six upper anterior teeth from canine to canine were chosen, and each tooth was divided into three levels (coronal, middle, apex) and four parts (buccal, palatal, mesial, and distal). The above data were collected before and after the orthodontic treatment by CBCT machine (i-CAT), and were further detected via the Mimics software approach. The results indicated that (1) the bone density around these teeth decreased during orthodontic treatment, and (2) the reducing amount of the bone density were more obviously on the direction of tooth movement in almost 57% of the observed teeth. The discoveries of this study coincided with “the pressure-tension theory”, which stated the bone resorption mainly occurred at the pressured side.
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Shu, Kuang-Wei, and 蘇桄緯. "Research on Root Resorption under Orthodontic Treatment Using Cone Beam Computed Tomography." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/42430915055072130469.
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碩士中國醫藥大學
牙醫學系碩士班
98
Many researches have proven that although root resorption also occurs in people who don''t receive any orthodontic treatment; however, the incidence of those who received orthodontic treatment is significantly higher. When the root resorption gets seriously severe during the treatment, the problem of poor crown root ratio and periodontal bone stress concentration might be encountered. If orthodontic patients suffer from periodontal diseases in the years to come, they will experience periodontal bone loss, and thus, poor prognosis of the teeth. Together with the development of medical imaging technique, Cone Beam Computed Tomography (CBCT) has been widely used in the dental field. In orthodontic treatment, CBCT has been used for the diagnosis of impacted teeth, the evaluation of orthognathic surgery, assessment of micro-implant placed between root anatomical spaces, but there are few studies about assessment of root resorption which is derived from orthodontic treatments by using CBCT. Therefore, in this study we used CBCT to evaluate root resorption after seven months of orthodontic treatment, and we also studied the relationship between the changes of bone density around the roots and the comparison of the distance of root movements. Eight patient objects are selected from the patients in the Department of Orthodontics, China Medical University Hospital Medical Center, including five males and three females, aged ranging from 20-25. Observed images of root resorption after orthodontic treatment by the i-CAT CBCT after irradiation were converted to the appropriate coordinate system. The analytic software was Mimics. We studied, after seven months of orthodontic treatment, the relationship between variation of root length and root length changes in percentage, and the percentage of root tip moving distance and root length changes, relationship between bone density around roots before treatment and root length changes in percentage, and the changes of bone density around root and root length changes in percentage. The results showed that after seven-month orthodontic treatment, the average of root resorption in the right maxillary central incisor is 0.25 ± 0.16 mm, left maxillary central incisor is 0.32±0.34 mm, right maxillary lateral incisor is 0.39±0.32 mm, left maxillary lateral incisor is 0.48±0.19 mm, right maxillary canine is 0.18±0.19 mm, left maxillary canine is 0.19±0.14 mm. In summary, before the treatment, the thicker the bone density is, the less the root resorption occurs. The more bone density changes in the treatment, the less the root resorption is. When the moving distance is longer between the root tips, the observed root resorption gets more serious.