Academic literature on the topic 'Orthodontic devices'
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Journal articles on the topic "Orthodontic devices"
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Jiang, Jingang, Wei Qian, Zhiyuan Huang, Yongde Zhang, and Houjun Chen. "Research Progress and Prospect of Orthodontic Accelerating Device." Recent Patents on Mechanical Engineering 13, no. 3 (August 26, 2020): 190–204. http://dx.doi.org/10.2174/2212797613666200128151515.
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Background: Malocclusion is a disease with a high incidence rate that is harmful to humans’ health. Fixed orthodontics is an effective method for the treatment of malocclusion. However, the orthodontic process takes a long time, requires frequent visits, causes pain, and increases the risk of complications. Since orthodontic treatment is lengthy, painful and unbearable, and even leads patients to abandon orthodontic treatment, therefore, how to shorten orthodontic treatment duration, and reduce pain is a research hotspot in the orthodontic field. Objective: The study aimed to provide an overview of the existing orthodontic accelerating device and introduce their classification, characteristics and development. Methods: This paper reviewed various productions and patents related to the orthodontic accelerating device. The structural characteristics, differentiations, and applications of the existing orthodontic accelerating device are also introduced. Results: The existing orthodontic accelerating devices were analyzed and compared, and the typical characteristics were concluded. The main problems in its development were analyzed, the development trend was foreseen, and the current and future research on the productions and patents related to the orthodontic accelerating device is discussed. Conclusion: The orthodontic accelerating device is composed of a vibration device having electrical stimulation, magnetic field, a low-level laser, and an ultrasonic device according to the application of different physical loads. Orthodontic accelerating device can effectively reduce orthodontic treatment time by 30%-50%, and can reduce the risk of complications and pain. The dose of the physical load determines the effect of the device. So, an optimal loading dose should be selected . Compared with vibrating devices, other types of devices are less used in clinical practice, therefore, such products and patents should be invented in the future.
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Kumar Prasanna, M. P., Ashish Handa, Karan Nehra, and Mohit Sharma. "Trends in Contemporary Orthodontic Research Publications: Evaluation of Three Major Orthodontic Journals." APOS Trends in Orthodontics 7 (December 1, 2017): 287–93. http://dx.doi.org/10.4103/apos.apos_77_17.
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Background In this study, we aimed to evaluate the inclination of orthodontic research published in original articles in three of the most popular and recognized orthodontic journals with high impact factor; American Journal of Orthodontics and Dentofacial Orthopedics (AJODO), the Angle Orthodontist (AO), and European Journal of Orthodontics (EJO) published in a 5-year duration time frame (2010–2014). Materials and Methods Online search with supplementary hand searching was undertaken for original research articles in these three orthodontic journals from 2010 to 2014. Classification of data was completed autonomously by manual and direct appraisal of the manuscript of each journal. Results and Conclusion Three thousand one hundred and forty articles published in AJODO, AO, and EJO in the particular time period were selected, out of which 1783 original research study articles (56.78%) were appraised for classification in their various respective knowledge domains. AO (82.73%) and EJO (76.99%) were relatively more committed toward publication of research work in comparison to AJODO (34.55%). Research articles based on perception and questionnaires (12%), temporary anchorage devices (11%), cone-beam computed tomography (8%), invisible orthodontics (lingual orthodontics, clear aligners, esthetic brackets, and wires) (5%), and airway examination (5%) were the five most recurrently selected subjects of interest (41%) in these three journals during the observation period. The total number of research articles published in the three journals reduced statistically significantly in 2014 when compared to 2010.
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Vijayalakshmi, PS, and AS Veereshi. "Temporary Orthodontic Anchorage Devices." World Journal of Dentistry 1, no. 2 (2010): 103–7. http://dx.doi.org/10.5005/jp-journals-10015-1021.
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ABSTRACT Efficient anchorage control is one of the important requisites for successful orthodontic treatment. The conventional means of anchorage control have been the use of transpalatal /lingual arch and palatal button but disadvantage is they do not provide absolute anchorage. Though the use of headgear provide efficient anchorage control, the patients are not compliant in using a headgear. Orthodontic implants have provided us with noncompliant and efficient means of anchorage control. This article traces the journey of development of implants as temporary anchorage devices.
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von Fraunhofer, Joseph A. "Corrosion of orthodontic devices." Seminars in Orthodontics 3, no. 3 (September 1997): 198–205. http://dx.doi.org/10.1016/s1073-8746(97)80070-9.
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Yamaguchi, Masaru, Toshihiro Inami, Ko Ito, Kazutaka Kasai, and Yasuhiro Tanimoto. "Mini-Implants in the Anchorage Armamentarium: New Paradigms in the Orthodontics." International Journal of Biomaterials 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/394121.
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Paradigms have started to shift in the orthodontic world since the introduction of mini-implants in the anchorage armamentarium. Various forms of skeletal anchorage, including miniscrews and miniplates, have been reported in the literature. Recently, great emphasis has been placed on the miniscrew type of temporary anchorage device (TAD). These devices are small, are implanted with a relatively simple surgical procedure, and increase the potential for better orthodontic results. Therefore, miniscrews not only free orthodontists from anchorage-demanding cases, but they also enable clinicians to have good control over tooth movement in 3 dimensions. The miniplate type also produces significant improvements in treatment outcomes and has widened the spectrum of orthodontics. The purpose of this paper is to update clinicians on the current concepts and versatile uses and clinical applications of skeletal anchorage in orthodontics.
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Churakova, Y. A., and A. A. Antonova. "Influence of orthodontic treatment with removable devices in children on the properties of oral fluid." Стоматология детского возраста и профилактика 20, no. 1 (April 1, 2020): 59–62. http://dx.doi.org/10.33925/1683-3031-2020-20-1-59-62.
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Relevance. The present article provides data regarding changes in the oral cavity during orthodontic tratment with custom-made removable appliances. Purpose. To study the condition of the oral cavity in children aged 7-12 with dentoalveolar abnormalities during treatment with removable orthodontic appliances.Materials and methods. 110 patients aged 7-12 were examined in Nakhodka, Russia. Group I – control (34 subjects) with no dentoalveolar pathology. Group II – children with dentoalveolar pathology (74 subjects), undergoing orthodontic treatment. Besides clinical examination the following laboratory tests were taken, namely: saliva viscosity, saliva PH, saliva buffer capacity, microcrystallography of saliva. Type III prevailed in 60% of cases. Results. Caries intensity during orthodontic treatment was detected to increase up to 8.32 ± 0.28 in comparison with control group 6.57 ± 0.22 (p < 0.05). Hygiene rate decreased in experimental group to 2.8 ± 0.08, in comparison with controls – 1.40 ± 0.02 (p < 0.05). Salivary PH decreased during orthodontic treatment. Microcrystallization type III of saliva prevailed in 60% of cases.Conclusions. The study revealed strong relationship between orthodonotic treatment with removable appliances and physicochemical properties of mixed saliva r = 0.95 (p < 0.05). Appropriate approach and timely preventive measures can help correct oral condition in orthodontic treatment. Despite changes in oral fluid composition, esthetic and functional result of treatment with orthodontic customized removable appliances was high.
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Meshalkina, I. V., L. V. Korsak, and T. B. Tkachenko. "Comparative analysis of speech therapy and orthodontic effects of orthodontic equipment used in the replacement bite to expand the upper dentition." Russian Journal of Dentistry 24, no. 1 (August 12, 2020): 23–27. http://dx.doi.org/10.18821/1728-2802-2020-24-1-23-27.
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The period of the first phase of replacement bite in children in the Russian Federation corresponds to the period of primary school age, which is considered one of the critical periods in the child's development, due to increased emotional loads, and children aged 67 years are at risk for developing combined orthodontic and speech therapy pathologies.The complexity of the correction of orthodontic treatment at this age patients associated with lack of coordination between the orthodontist and speech therapist: a speech therapist does not accept the correction of the patient, until he had reached the incisors contact, and the orthodontist begins orthodontic treatment, since it prevents the wrong position and function of tounge.Most modern removable orthodontic appliance restrict the mobility of the tongue to some extent, thus forcing the child to move it down and back, suppressing its tone. In addition, the use of these devices prevents speech therapy correction, since it violates the automation of sound reproduction. The use of removable orthodontic appliance has positive orthodontic effects, but at the same time, contributes to the development of the second and third level of incorrect sound reproduction.In our experience, the device of choice in such situations is the Haas appliance. The use of the Haas appliance gives the fastest orthodontic effects, and myofuction therapy, speech therapy, as well as ottorhinolaryngological treatment can be carried out at the same time, which helps to consolidate the result and reduces the likelihood of relapses to a minimum.
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Ogasawara, Takeshi, Masayoshi Uezono, Kazuo Takakuda, Masanori Kikuchi, Shoichi Suzuki, and Keiji Moriyama. "Shape Optimization of Bone-Bonding Subperiosteal Devices with Finite Element Analysis." BioMed Research International 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/3609062.
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Subperiosteal bone-bonding devices have been proposed for less invasive treatments in orthodontics. The device is osseointegrated onto a bone surface without fixation screws and is expected to rapidly attain a bone-bonding strength that successfully meets clinical performance. Hence, the device’s optimum shape for rapid and strong bone bonding was examined in this study by finite element analyses. First, a stress analysis was performed for a circular rod device with an orthodontic force parallel to the bone surface, and the estimate of the bone-bonding strength based on the bone fracture criterion was verified with the results of an animal experiment. In total, four cross-sectional rod geometries were investigated: circular (Cr), elliptical (El), semicircular (Sc), and rectangular (Rc). By changing the height of the newly formed bone to mimic the progression of new bone formation, the estimation of the bone-bonding strength was repeated for each geometry. The rod with the Rc cross section exhibited the best performance, followed by those with the Sc, El, and Cr cross sections, from the aspects of the rapid acquisition of strength and the strength itself. Thus, the rectangular cross section is the best for rod-like subperiosteal devices for rapid bone bonding.
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DiPasquale, Thomas J. "Reconditioning and reuse of orthodontic devices." American Journal of Orthodontics and Dentofacial Orthopedics 102, no. 3 (September 1992): 285–87. http://dx.doi.org/10.1016/s0889-5406(05)81065-0.
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DiPasquale, Thomas J. "Reconditioning and reuse of orthodontic devices." American Journal of Orthodontics and Dentofacial Orthopedics 102, no. 2 (August 1992): 187–89. http://dx.doi.org/10.1016/s0889-5406(05)81229-6.
Full textDissertations / Theses on the topic "Orthodontic devices"
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Schreiber, Alex C. "Success rates of temporary anchorage devices placed in an orthodontic clinic." Thesis, Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2008m/schreiber.pdf.
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Shirck, Jeffrey Michael. "Survey of Temporary Anchorage Device Utilization in Graduate Orthodontic Programs and Orthodontic Practices in the United States." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1235673960.
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Wucher, Tim. "The development of a new orthodontic appliance using non-conventional electromechanical methods." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80041.
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Thesis (MScEng)--Stellenbosch University, 2013.ENGLISH ABSTRACT: Orthodontics is the eld of dentistry concerned with the treatment of maloc- clusion and anomalies of the dento-facial complex. This thesis is concerned with studying the underlying biomechanical principles of orthodontic tooth movement. It aims to develop a novel treatment approach and an orthodontic appliance to facilitate said approach by employing advanced technologies. A thorough review of the literature is used to form a comprehensive knowledge base pertaining to the factors a ecting orthodontic tooth movement. It is hypothesised that an electromechanical orthodontic appliance could improve treatment by characterising orthodontic cases based on the relationship be- tween the applied mechanical stimulus and the resulting changes to the af- fected structures, which can then be sensed by the appliance. A prototype is built using electronically controllable linear actuators and a custom built force transducer system for measuring orthodontic forces. Electronic circuits are de- veloped to connect the appliance to a USB port and allow it to be controlled from a graphical user interface (GUI). This further facilitates real-time viewing of important orthodontic parameters. Experiments are carried out to evaluate the appliance functionality with regard to the proposed hypothesis. To con- clude, the relevance of the results to the orthodontic eld is highlighted and recommendations for further development of an electromechanical orthodontic appliance are provided.
AFRIKAANSE OPSOMMING: Ortodonsie is die vakgebied in tandheelkunde gemoeid met die behandeling van wanpassing en abnormaliteit van die tand- en gesig-area. Hierdie tesis bestudeer die onderliggende biomeganiese beginsels van ortodontiese tandbeweging om sodoende 'n nuwe benadering sowel as 'n ortodontiese apparaat te ontwikkel om die genoemde benadering te fasiliteer deur gebruik te maak van gevorderde tegnologie. 'n Deeglike oorsig van die literatuur word gebruik om 'n omvattende kennisbasis op te bou rondom die faktore wat ortodontiese tandbeweging a ekteer. Die hipotese word gestel dat 'n elektromeganiese ortodontiese apparaat behandeling kan verbeter deur ortodontiese gevalle te identi seer/- karakteriseer gebaseer op die verhouding tussen die toegepaste meganiese stimulus en die gevolglike veranderinge aan die gea ekteerde strukture wat deur die apparaat aangevoel word. Elektronies-beheerbare lineêre aandrywers en 'n pasgemaakte krag-oordraerstelsel vir die meet van ortodontiese kragte word gebruik om 'n prototipe te vervaardig. Elektroniese stroombane word ontwikkel om die apparaat te koppel aan 'n USB poort sodat dit beheer kan word d.m.v. 'n gra ese gebruikerskoppelvlak. Eksperimente poog om die apparaat funksioneel te evalueer volgens die voorgestelde hipotese. Ter afsluiting: die toepaslikheid van die verwerfde resultate in die ortodontiese vakgebied word beklemtoon en aanbevelings word gemaak vir toekomstige/verdere ontwikkelings m.b.t. 'n elektromeganiese ortodontiese apparaat.
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Menezes, Carolina Carmo de. "Influência do padrão de crescimento sobre a espessura da cortical óssea alveolar e sua correlação com a estabilidade dos mini-implantes." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/25/25144/tde-14072011-090448/.
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O objetivo deste estudo foi avaliar a influência do padrão de crescimento craniofacial na espessura da cortical óssea alveolar e correlacioná-lo com a estabilidade dos mini-implantes ortodônticos. A amostra constituiu de 30 pacientes com 56 mini-implantes inseridos na região posterior vestibular da maxila como recurso de ancoragem na retração anterior. Inicialmente, os pacientes foram divididos de acordo com a média do ângulo FMA, em padrão de crescimento horizontal (grupo GH) e vertical (grupo GV). As espessuras das corticais ósseas foram mensuradas nos cortes axiais das imagens de tomografia computadorizada de feixe cônico. As médias econtradas em cada grupo foram comparadas pelo teste t. A correlação de Pearson foi realizada entre os valores do ângulo FMA e as espessuras das corticais ósseas. Posteriormente, para avaliar a influência do padrão de crescimento sobre a estabilidade dos mini-implantes, estes foram divididos em dois grupos também de acordo com o padrão de crescimento: GMI(H) horizontal e GMI(V) vertical. Os grupos foram comparados quanto ao grau de mobilidade e a proporção de sucesso dos mini-implantes pelos testes de Mann-Whitney e o teste Exato de Fisher. Através desses testes e do teste Qui-quadrado foi avaliada a influência das seguintes variáveis sobre o grau de estabilidade: características do tecido mole na região de inserção, sensibilidade, a quantidade de placa, o período de observação e a técnica utilizada para cada dispositivo. Os resultados obtidos demonstraram que a espessura da cortical óssea alveolar anterior (superior e inferior) e posterior (inferior) vestibulares foram maiores no grupo GH do que o grupo GV. Houve correlação negativa significante entre o FMA e as espessuras nas regiões anteriores inferiores (vestibular e lingual) e superior (vestibular). Não houve diferença significante nos resultados para o grau de mobilidade e proporção de sucesso dos mini-implantes nos grupos GMI(H) e GMI(V). O tempo médio de observação foi de 8,77 meses. A proporção de sucesso total foi de 89,29% e nenhuma variável mostrou estar relacionada com o sucesso dos mini-implantes. No entanto, observou-se maior sensibilidade nos pacientes cujo mini-implante apresentava mobilidade e a falha desses dispositivos de ancoragem ocorria logo após sua inserção.This study aimed the assessment of the craniofacial growth pattern influence on the alveolar bone cortical thickness as well as the evaluation of the stability of orthodontic mini-implants. The sample comprised 56 mini-implants inserted on the posterior buccal region of the maxilla of 30 patients with the purpose of orthodontic anchorage for the anterior retraction. Initially, patients were divided by FMA mean according to the growth pattern as: horizontal group (GH group) and vertical group (GV group). The alveolar cortical bone thicknesses were measured in the axial sections of the images of cone-beam computed tomography. The means found for each group were compared with the t test. Pearson´s correlation was performed for the values of growth pattern (FMA) and for the thicknesses of cortical bone. In order to evaluate the influence of growth pattern on the stability of mini-implants, these devices were divided in two other groups, according to the growth pattern as: GMI(H), horizontal and GMI(V), vertical. The mobility degree and success rate of mini-implants shown by these two groups were compared using Mann-Whitney tests and Fisher Exact test. Through these tests and the Chi-square test the influence of the following variables on the degree of stability were evaluated: soft tissue characteristics of the insertion site, sensibility degree, plaque retention around miniimplant, observation period and technique used. The results demonstrated that the thickness of the anterior buccal cortical bone (upper and lower) and the posterior cortical bone (lower) were greater for the GH group than for the GV group. There was a significant negative correlation between the FMA and the thicknesses of the lower anterior regions (buccal and lingual) and upper regions (buccal). No significant difference was found regarding the mobility degree and the success rate of miniimplants between the groups GMI(H) and GMI(V). Total success rate found was 89.29% and no variable showed to be related to the success of mini-implants. Nevertheless, a greater sensibility was observed in patients whose mini-implants presented mobility and the failure of these anchorage devices occurred in a short time after insertion.
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Tatsi, Chrysoula. "Slow release fluoride glass devices in the prevention of enamel demineralisation during fixed appliance orthodontic treatment." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/8104/.
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Enamel demineralisation or white spot lesions (WSLs) is a risk for all patients undergoing fixed appliance orthodontic treatment (FAOT) with no consensus with regards to prevalence, risk factors, prevention and treatment. Slow-release fluoride glass devices (SRFGDs) have been shown to clinically prevent caries without relying on patient’s compliance, therefore their effectiveness in preventing WSLs during FAOT was investigated. An in-vitro exploratory study investigated fluoride (F) and phosphate (PO4) release from different types of powder from SRFGDs incorporated into a composite resin bonding material. Samples were stored in artificial saliva and assessed with ion chromatography for up to six months. Three types of powder showed high F release to maximise caries prevention and low PO4 release to minimise degradation of powder. A questionnaire was emailed to orthodontists’ members of the British Orthodontic Society. For majority of responders the key factors to the problems related to WSLs are clinical examination, photographs, F, oral hygiene, diet and duration of FAOT. A double-blind, randomised clinical study with orthodontic patients randomly allocated to SRFGDs or placebo devices threaded onto the orthodontic wire was conducted. Cross-polarised digital photographs of the maxillary permanent central and lateral incisors and canines were taken for 63 subjects at the start and for 40 subjects at the end of the study. One examiner assessed photographs for presence and severity of WSLs. Majority of volunteers and the smallest number of refusals lived in the most deprived areas according to the Multiple Deprivation Index. Use of SRFGDs would decrease severity by preventing 2.88 times more teeth compared to use of 225 ppm F mouth-rinse once daily and 1,450 ppmF tooth-paste twice daily. Duration of FAOT and increased gingival index at the start of FAOT increased significantly the risk of developing WSLs. SRFGDs were effective in preventing teeth with WSLs during the course of FAOT.
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Almeida, Fabiano Costa 1969. "Compósitos cerâmicos alumina-zircônia para aplicação em bráquetes estéticos de ortodontia." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265817.
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Orientador: Cecília Amélia de Carvalho ZavágliaTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
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Resumo: Os bráquetes são suportes utilizados pelos ortodontistas para controlar o posicionamento dos dentes nos tratamentos ortodônticos. Por eles, mais precisamente por seus slots, passam os fios ortodônticos e ambos são responsáveis pela biomecânica dos movimentos. O bráquete pode ser confeccionado por diversos materiais, sendo o mais comum o metal pela praticidade, preço e resistência. Recentemente, com a maior demanda por aparelhos estéticos, devido ao aumento de adultos utilizando estes dispositivos, aumentou o uso de bráquetes estéticos, feitos geralmente de polímeros ou cerâmicas. As maiores dificuldades encontradas estão relacionadas a estética, resistência, capacidade de coloração por alimentos e maior atrito com o fio. O propósito deste estudo foi a obtenção de compósitos cerâmicos de alumina e zircônia (ZTA) a partir de pós finamente cominuídos em diferentes proporções 70/30, 80/20 e 90/10 provenientes de materiais cerâmicos de alumina e zircônia separadamente. Os compósitos cerâmicos (ZTA) foram submetidos a processos de análises do tamanho de partículas, moagens, prensagens, conformações de corpos de provas (c.p.), difração de raio X, ensaios de compressão diametral, análises das propriedades mecânicas, avaliações das microestruturas e análises de propagação de trincas. Os resultados demonstraram tamanhos de partículas de 0,3µ, os valores da compressão diamentral de 296,64 MPa, 262,60 MPa, 220,30 MPa, os valores de microdureza de 13,12 GPa, 13,42 GPa, 13,81 GPa, os valores de tenacidade à fratura de 8,91 MPa m½, 9,37 Mpa m½, 9,65 Mpa m½, os tamanhos de grãos em torno de 0,6µ e uma redução significativa nas propagações das trincas em relação à alumina. Estes compósitos cerâmicos de alumina e zirconia (ZTA) demonstraram resultados superiores em seus valores de tenacidade à fratura de aproximadamente 68% em relação a alumina, atualmente utlizados em bráquetes comerciais. Ocorreu uma redução do tamanho de grãos e modificações no comportamento de propagação das trincas resultando na diminuição da ocorrência de trincas. A conclusão, diante dos resultados apresentados nas análises, foi que os materiais compósitos cerâmicos de alumina e zircônia (ZTA), nos quesitos avaliados, foram adequados para serem aplicados em bráquetes estéticos de Ortodontia, porém novos trabalhos foram sugeridos para avaliação desses materiais em relação ao desgaste, a fricção e a coloração. Palavras-chave Aparelhos ortodonticos estéticos, bráquetes cerâmicos, compósitos cerâmicos, compósitos ZTA
Abstract: The brackets are used by orthodontists to control the tooth positions on orthodontic treatments. Inside the brackets, in the slots, are the orthodontic wire and both are responsible for the biomechanical movement. The brackets can be made of different materials and the most common is the metallic by practically, price and resitance. Recently, with the greatest demand of aesthetic devices, because a adult demand, increased use of aesthetic brackets made of polymers and ceramics. The greatest aesthetic difficulties are the resitence, staining for food and the wire friction. This work aims to contribute to the development of new aesthetic orthodontic brackets. Thereby was proposed in this study the obtainment of ceramic composites alumina and zirconia (ZTA) powder finely comminuted in different proportions 70/30, 80/20 and 90/10 from alumina and zirconia separately. These ceramic composites alumina and zirconia (ZTA) were submitted to particle analysis, milling process, pressing, specimens conformations, X ray diffraction, diametral compression, mechanical properties analysis, evaluation of microstructured and crack propagation analysis. The results showed particle size 0,3µ, the diametral compression values of 296,64 MPa, 262,60 MPa, 220,30 Mpa, the hardness values of 13,12 GPa, 13,42 GPa, 13,81 GPa, the fracture toughtness values of 8,91 MPa m½, 9,37 Mpa m½, 9,65 Mpa m½, the grain size of 0,6µ and a significant reduction in crack propagation compared to alumina. These ceramic composites alumina and zirconia (ZTA) demonstrated superior results in their fracture toughness values of approximately 68% compared to alumina, currently used in commercial brackets. There was a reduction in grain size and changes in the behavior of propagation of cracks resulting in a decrease of occurance of cracks. The conclusion on the results presented was that ceramic composites alumina and zirconia (ZTA), on the variables evaluated, were suitable for application in Orthodontic aesthetic brackets however new studies have been suggested for the evaluation of these materials in relation to wear, friction and staining. Key Words Aesthetic orthodontic devices, ceramic brackets, ceramic composites, ZTA composites
Doutorado
Materiais e Processos de Fabricação
Doutor em Engenharia Mecânica
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Busciglio, Dana. "Effect of thread design of orthodontic miniscrew implants on stress generation using photoelastic analysis." Thesis, NSUWorks, 2011. https://nsuworks.nova.edu/hpd_cdm_stuetd/34.
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A thesis submitted to the College of Dental Medicine of Nova Southeastern University of the degree of Master of Science in Dentistry.
Objectives. The purpose of this study was to determine the effect of pitch and thread depth of orthodontic miniscrew implants(MSI's) on stress generation. Methods. Quasi-three dimensional photoelastic models were created with MSI's embedded and then loaded with 60 and 104 grams respectively and evaluated under a full field reflection polariscope. The control MSI's (1.0mm pitch / 0.25mm thread depth) were compared to 3 experimental groups (n=10) which varied with only one design characteristic: Group 1 (0.75mm pitch), Group 2 (1.25mm pitch) and Group 3 (0.40 thread depth). The maximum shear stress (τmax) was calculated at 5 predetermined and standardized points. A two-way ANOVA was conducted to compare the means of τmax followed by a Tukey's post hoc (p<0.05). Results. No statistical differences were found for τmax between the control group and each of the 3 experimental groups except at point 4. At point 4, the control group was higher by an average of 5.05 and 7.1 MPa for the 60 and 104 gram loads respectively (p<0.05). No statistically significant differences were found for points 1, 2, and 5 for the 60 gram load and for points 1, 2, 3, and 5 for the 104 gram load. The mean τ max from highest to lowest was located at points 5<1< 2<4 <3 in both the 60 and 104 load steps. The variability in τmax at point 4 may have been due to its proximity to the neutral zone of the present loading conditions. Conclusions. As the orthodontic load was increased, maximum shear stress also increased for each of the four MSI designs used in this study. The results of this study suggest that, within limits, variation of pitch and thread depth of MSI's may not have a significant influence on the stress generation when loaded for orthodontic purposes. Photoelastic analysis has shown to be a viable option to evaluate mechanical properties of MSI'S.
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Mariscal, Muñoz Juan Francisco. "Avaliação tridimensional das mudanças dentárias após avanço mandibular com o aparelho de Herbst bandado em indivíduos classe II divisão 1, após surto de crescimento." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/157315.
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O objetivo do trabalho foi avaliar tridimensionalmente as mudanças dentárias após avanço mandibular com o aparelho de Herbst bandado em indivíduos classe II divisão 1, após surto de crescimento. A amostra deste trabalho constituiu-se de modelos ortodônticos pré (T1) e pós tratamento (T2) de 34 pacientes (21 indivíduos masculinos e 13 femininos, idade média 16,2) portadores de má oclusão de Classe II divisão 1, que receberam na média terapia de avanço mandibular durante 8 meses. Estes modelos de estudo foram digitalizados (R700, 3Shape®) em oclusão habitual e analisados tridimensionalmente através do software VistaDent®. Em função de objetivos específicos, dividiu-se o trabalho em dois estudos. O primeiro estudo foi desenvolvido com o intuito de detectar efeitos acontecidos após 8 meses de avanço mandibular com aparelho de Herbst bandando, sobre a Curva de Spee (CDS) mandibular, índice de irregularidade de Little e inclinação vestíbulo-lingual dos incisivos inferiores. A análise estatística foi realizada por meio do teste t de Student, com nível de significância de 5%, precedido do teste de Levene, para analisar a hipótese de igualdade das variâncias. Incremento na profundidade da CDS (média -1,47 mm, P <0,00005), aumento no índice de irregularidade (média-1,89 mm; P <0,00005), e foi encontrada uma diferente proclinação entre incisivos laterais (32: média, 3,01, P <0,05; 42: média, 3,83, P <0,005) e incisivos centrais mandibulares (31: média, 1,80°, P <0,05; 41: média, 2,43°, P <0,05). Resultados sugeriram uma mudança negativa clinicamente significativa na profundidade da CDS, incremento no índice de irregularidade e proclinação diferenciada dos incisivos inferiores, após 8 meses de terapia com aparelho de Herbst bandado. O segundo estudo teve como objetivo de avaliar os efeitos dentários transversais imediatos após 8 meses de avanço mandibular com aparelho de Herbst bandando, na distância intercaninos, interpré-molares e intermolares assim como a rotação dos primeiros molares maxilares e mandibulares. Comparação estatística das varáveis pré e pós-tratamento e dimorfismo de gênero foi feita através do teste t de Student com um nível de significância de 5% precedido do teste de Levene, para analisar a hipótese de igualdade das variâncias. Diferenças na homogeneidade de gênero dentro da amostra (T1) provocou a separação do grupo para avaliação individual (masculino/feminino) em algumas das variáveis estudadas. Incremento nas distâncias interpré-molares da maxila (15-25: média 1,66 mm; 14-24: média 1,36 mm), mudanças insignificantes nas distâncias intercaninos (Mandibular: média 0.02 P=947; Maxilar: média 0.36 mm; P =0,177), ausência de rotações nos molares e um leve incremento nas distâncias intermolares (maxilar: média 0,80 mm; mandibular: média 0,06 mm) foram os resultados mais relevantes do trabalho. Resultados sugeriram mudanças transversais significativas nas distâncias interpré-molares maxilares, intermolares maxilar e mandibular com ausência de rotações e uma estabilidade das distâncias intercaninos.
The aim of this study was to evaluated three-dimensional mandibular dental effects with a banded Herbst appliance on Class II division 1 individuals, post growth spurt. The sample of this work constituted with pre-treatment (T1) and post-treatment (T2) orthodontic models of 34 patients (21 male, 13 female, average of 16,2 years-old) with Class II division 1 malocclusion, who received a mandibular advanced therapy during 8 months, were digitalized (R700, 3Shape®) in habitual occlusion and three-dimensionally analyzed through VistaDent® software In function of specific objectives this investigation was divided in 2 different studies. The first one with the intention of detecting dental effects of mandibular advancement with a Banded Herbst appliance over the Curve of Spee during 8 months; irregularity index of Little and vestibular-lingual inclination of the mandibular incisors. Statistical analysis was done through the T student test, with a level of significance of 5%, preceded by the Levene test, to analyze the equality of variances. Increase in depth of CDS (average-1,47 mm, P <0,00005), as well as the index of irregularity (average- 1,89 mm; P <0,00005); a different proclination was found in between lateral incisors (32: average, -3,01, P <0,05; 42: average, -3,83, P <0,005) and mandibular central incisors (31: average, -1,80°, P <0,05; 41: average, -2,43°, P <0,05). (31: average: -1,80°, P <0,05; 41: average, -2,43°, P <0,05). The results reflected a clinically significant negative effect in CDS depth, increase in the index of irregularity and differentiated proclination of mandibular incisors, after an 8-month therapy with Herbst banded appliance. The objective of the second study was to evaluate the immediate transversal dental effects after 8 months of mandibular advancement with a banded Herbst appliance, on inter-canine, inter-premolar and inter-molar distance; as well as the rotation of the mandibular and maxillary first molars. The statistical comparison between pre-treatment and post-treatment variances and gender dimorphism was made through the Student t test, with a level of significance of 5%, preceded by the Levene test, to analyze the hypothesis of variances equality. Differences in gender homogeneity in the sample (T1) provoked a group separation, becoming an individual evolution (male/female) in some of the studied variables. Increase in maxillary inter-premolar distances (15-25: average 1,66 mm; 14-24: average 1,36 mm), insignificant statistical changes within inter-canine distances (Mandibular: average 0.02 P=947; Maxillary: average 0.36 mm; P =0,177), absence of rotation in molars and slight increase in inter-molar distances (maxillary: average 0,80 mm; mandibular: average 0,06 mm) were the most relevant increases in this research. The results suggested significant transversal changes in maxillary inter-premolar distances, maxillary and mandibular inter-molar rotation absence and instability of inter-canine distance.
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Gigliotti, Mariana Pracucio. "Influência da proximidade entre o mini-implante e as raízes dentárias sobre o grau de estabilidade." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/25/25134/tde-29052009-111711/.
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O objetivo deste trabalho foi avaliar a influencia da proximidade entre miniimplantes autoperfurantes e as raizes dentarias sobre a estabilidade destes dispositivos de ancoragem. A amostra consistiu de 40 mini-implantes inseridos entre as raizes do primeiro molar e segundo pre-molar superiores de 21 pacientes, como recurso de ancoragem para retracao anterior. A largura do septo no local de insercao (LSI) e a menor distancia da cabeca do mini-implante a raiz dentaria (MDR) foram mensuradas nas 40 radiografias pos-cirurgicas. Sob este aspecto, os miniimplantes foram divididos em duas categorias de grupos: de acordo com a largura do septo no local de insercao, grupos G1L (LSI3mm) e G2L (LSI>3mm), e de acordo com a proximidade do mini-implante a raiz adjacente, grupos G1P (MDR0mm) e G2P (MDR>0mm). A estabilidade dos mini-implantes foi avaliada mensalmente pela quantificacao do grau de mobilidade, e a partir desta variavel foi calculada a proporcao de sucesso. Tambem foi avaliada a influencia das seguintes variaveis sobre o grau de estabilidade: caracteristica do tecido mole no local de insercao, o grau de sensibilidade, a quantidade de placa, a altura de insercao e o periodo de observacao. As duas categorias de grupos foram comparadas quanto ao grau de mobilidade e proporcao de sucesso por meio do teste de Mann-Whitney e do teste Exato de Fisher, respectivamente. Adicionalmente, avaliou-se a influencia das demais variaveis sobre a estabilidade deste sistema de ancoragem atraves do teste t e do teste do Qui-quadrado. Os resultados obtidos demonstraram que não houve diferenca estatisticamente significante para o grau de mobilidade e proporção de sucesso entre os mini-implantes inseridos em septos do grupo G1L e G2L. A proximidade entre os mini-implantes avaliados e as raizes dentarias adjacentes (grupos G1P e G2P) tambem nao influenciou na estabilidade e proporcao de sucesso deste sistema de ancoragem. A proporcao de sucesso total encontrada foi de 90% e nenhuma variavel demonstrou estar relacionada ao insucesso dos miniimplantes. No entanto, observou-se maior sensibilidade nos pacientes cujos miniimplantes apresentavam mobilidade, e que a falha destes dispositivos de ancoragem ocorria logo apos sua insercao.The purpose of this study was to evaluate the influence of the proximity between self-drilling miniscrews and dental roots on the stability degree. The sample consisted of 40 miniscrews inserted in the interradicular septum between maxillary second premolars and first molars to provide skeletal anchorage for anterior retraction. The forty post-surgical radiographs were used to measure the septum width in the insertion site (SWI) and the smallest distance between miniscrew head and dental root (SDR). In this regard, the miniscrews were divided in two categories of groups: according to the septum width in the insertion site, groups G1W (SWI 3mm) and G2W (SWI>3 mm), and according to the miniscrew dental root proximity, groups G1P (SDR0mm) and G2P (SDR>0mm). The mobility degree (MD) was monthly quantified to determine miniscrew stability, and the success rate of these devices was calculated. This study also evaluated the influence of following variables on the stability degree: soft tissue characteristics in the insertion site (attached gingiva, mucogingival junction and alveolar mucosa), sensitivity degree during miniscrew load, plaque amount around miniscrew, insertion height, and total evaluation period. All the groups were compared regarding mobility degree and success rate using t test and Fisher exact test, respectively. The results showed no significant difference in mobility degree and success rate between groups G1W and G2W. The miniscrew dental root proximity did not influence the stability and success rate of this anchorage system when G1P and G2P were compared. The total success rate found was 90% and no variable was associated with the miniscrew failure. Nevertheless, the results showed that greater patient sensitivity degree was associated to the miniscrews mobility and the failure of these anchorage devices happened in a short time after their insertion.
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Grec, Roberto Henrique da Costa. "Avaliação cefalométrica comparativa do tratamento da má oclusão de Classe II com o distalizador first class em ancoragem convencional e esquelética e aparelho extrabucal cervical seguidos de aparelho fixo." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/25/25144/tde-03092015-104346/.
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O objetivo deste estudo longitudinal foi comparar as alterações dentoesqueléticas e tegumentares de jovens com má oclusão de Classe II não tratados e tratados com distalizador First Class em ancoragem convencional ou esquelética, ou com o aparelho extrabucal cervical (AEB), seguidos do aparelho fixo. A amostra foi composta por 44 pacientes com má oclusão de classe II e divididos em quatro grupos de 11 cada: pacientes tratados com distalizador First Class com ancoragem convencional no botão de Nance (G1), tratados com distalizador First Class com ancoragem esquelética apoiado em 2 mini-implantes no palato (G2), tratados com o aparelho extrabucal (AEB) (G3) e o grupo controle, com pacientes não tratados (G0). Foram obtidas as telerradiografias ao início (Ti) e final (Tf) do tratamento para a realização das análises cefalométricas e avaliação das alterações dentárias, esqueléticas e tegumentares e compará-los com o grupo controle (G0). A análise estatística foi realizada pelo teste t pareado com a finalidade de verificar as alterações ocorridas dentro de um mesmo grupo e pelo teste ANOVA a um critério e teste de Tukey para verificar as diferenças entre os grupos. Observou-se restrição e redirecionamento do crescimento maxilar ao final do tratamento no G1 e G3. Os efeitos esqueléticos na mandíbula só foram significantes no G0. As medidas da relação maxilomandibular diminuíram significantemente no G1 e G3 com significante diminuição das medidas que avaliaram o perfil tegumentar. Quanto ao componente vertical todas as medidas aumentaram no G3. Os primeiros molares superiores angularam distalmente no G2 e os inferiores mesialmente no G3. Os quatro grupos apresentaram extrusão dos dentes superiores e inferiores. Os três grupos experimentais apresentaram diminuição significante nas relações dentárias (relação molar, trespasse horizontal e vertical). Conclui-se que os grupos experimentais corrigiram a má colusão de Classe II de maneira satisfatória, sendo que o uso do AEB mostrou efeitos esqueléticos e dentários na correção e os grupos com distalizadores somente efeitos dentários. O tempo de tratamento no grupo com AEB foi significantemente menor.The aim of this prospective study was to compare the dental, skeletal and soft tissue changes in youngsters with Class II malocclusion untreated and treated with First Class distalizer in conventional or skeletal achorage or with cervical headgear followed by fixed orthodontic appliances. The sample consisted of 44 patients with Class II malocclusion and divided into four groups of 11: patients treated with First Class distalizer with conventional anchorage (Nance button)(G1), treated with First Class distalizer with skeletal anchorage supported in two palatal mini-implants (G2), treated with cervical headgear (G3) and follow-up group with untreated patients (G0). Lateral cephalometrics radiographs were taken before treatment and after treatment in order to cephalometric analysis and evaluate the dental, skeletal and soft tissue changes and to compare with follow-up group (G0). Statistical analysis was performed by dependent t test to verify the changes occurred in the same group and by one-way ANOVA and Tukey test to verify the changes occurred between the groups. It was observed restriction and redirection of maxillary growth after treatment in G1 and G3. Mandibular skeletal effects were significant in G0. The values of skeletal maxilomandibular relationship decreased significantly in G1 and G3 with significant decrease of measurements that evaluated soft facial profile. All measurements of vertical component increased in G3. Maxillary first molars were distal tipping in G2 and lower first molars were mesial tipping in G3. The four groups showed extrusion in the upper and lower teeth. The three experimental groups showed significant decreased in the molar relationship, overjet and overbite. It concluded that experimental groups corrected the Class II malocclusion efficiently, cervical headgear showed skeletal and dental effects and the groups with distalizers showed only dental effects. The mean treatment period was significant lower with cervical headgear.
Books on the topic "Orthodontic devices"
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Andres, Uribe Flavio, ed. Temporary anchorage devices in orthodontics. St. Louis, Mo: Mosby, 2009.
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Nanda, Ravindra, Flavio Andres Uribe, and Sumit Yadav. Temporary Anchorage Devices in Orthodontics. Mosby, 2020.
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Temporary Anchorage Devices in Orthodontics. Elsevier, 2021. http://dx.doi.org/10.1016/c2017-0-02979-8.
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Park, Jae Hyun. Temporary Anchorage Devices in Clinical Orthodontics. Wiley & Sons, Incorporated, John, 2020.
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Park, Jae Hyun. Temporary Anchorage Devices in Clinical Orthodontics. Wiley & Sons, Incorporated, John, 2020.
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Park, Jae Hyun, ed. Temporary Anchorage Devices in Clinical Orthodontics. Wiley, 2020. http://dx.doi.org/10.1002/9781119513636.
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Park, Jae Hyun. Temporary Anchorage Devices in Clinical Orthodontics. Wiley & Sons, Limited, John, 2020.
Find full textBook chapters on the topic "Orthodontic devices"
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Baik, Unbong B. "Molar Protraction: Orthodontic Substitution of Missing Posterior Teeth." In Temporary Skeletal Anchorage Devices, 119–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-55052-2_8.
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Lee, Kee-Joon. "Pre-orthodontic Orthognathic Surgery (POGS) Using TADs: Evidences and Applications." In Temporary Skeletal Anchorage Devices, 209–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-55052-2_11.
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Buschang, Peter H., and Ki Beom Kim. "Considerations for Optimizing the Use of Miniscrew Implants in Orthodontic Practice." In Temporary Skeletal Anchorage Devices, 1–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-55052-2_1.
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Okioga, A. N., R. J. Greene, D. G. Patrick, and R. A. Tomlinson. "Analysis of Stress Distribution Caused by Orthodontic Correctional Devices." In Mechanics of Biological Systems and Materials, Volume 4, 67–73. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00777-9_9.
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Cho, Il-Sik, and Seung-Hak Baek. "Contributing Factors to Success Rate of Orthodontic Mini-implants: Important but Ignored Results from Basic Researches." In Temporary Skeletal Anchorage Devices, 49–55. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-55052-2_3.
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Lee, Kee-Joon, and Young-Chel Park. "Application of TADs in Lingual Orthodontics: A Modified Segmented Arch Approach." In Temporary Skeletal Anchorage Devices, 185–207. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-55052-2_10.
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Kim, Su-Jung, and Young-Guk Park. "Mandibular Advancement Device for Elderly OSA Patients." In Orthodontics in Obstructive Sleep Apnea Patients, 109–30. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-24413-2_9.
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Baumgaertel, Sebastian. "Planning and Placing Temporary Anchorage Devices with the Aid of Cone Beam Computed Tomography Imaging." In Cone Beam Computed Tomography in Orthodontics: Indications, Insights, and Innovations, 411–25. Ames, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118674888.ch18.
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Choi, Jong-Woo, and Jang Yeol Lee. "Postoperative Care of Patients Undergoing the Surgery-First Approach and Postoperative Orthodontics Involving Temporary Anchorage Devices." In The Surgery-First Orthognathic Approach, 49–69. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-7541-9_4.
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"Temporary Anchorage Devices." In Orthodontic Pearls, 240–59. CRC Press, 2015. http://dx.doi.org/10.1201/b18079-23.
Full textConference papers on the topic "Orthodontic devices"
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Savignano, Roberto, Sandro Barone, Alessandro Paoli, and Armando V. Razionale. "FEM Analysis of Bone-Ligaments-Tooth Models for Biomechanical Simulation of Individual Orthodontic Devices." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34912.
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In the last decades, research in the orthodontic field has focused on the development of more comfortable and aesthetic appliances such as thermoformed aligners. Aligners have been used in orthodontics since the mid 20-century. Nonetheless, there is still not enough knowledge about how they interact with teeth. This paper is focused on the development of a Finite Element Method (FEM) model to be used in the optimization process of geometrical attributes of removable aligners. The presented method integrates Cone Beam Computed Tomography (CBCT) data and optical data in order to obtain a customized model of the dental structures, which include both crown and root shapes. The digital simulation has been focused on analyzing the behavior of three upper frontal teeth. Moreover, the analyses have been carried out by using different aligners’ thicknesses with the support of composite structures polymerized on teeth surfaces while simulating a 2 degrees rotation of an upper central incisor.
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Najari, Mohamad, Marwan El-Rich, Samer Adeeb, and Bachar Taha. "A New Anchorage Device for Orthodontic Applications." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63973.
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In orthodontic treatment, anchorage is the most important element that affects the treatment’s success. To improve the load bearing capacity of the anchorage there are several devices developed in recent decades such as midpalatal implants and onplants but they also have limitation on directions of applied load and their support position adjustability. The purpose of this study was to investigate the efficiency of a new anchorage device by analyzing the load-bearing and stress distribution among the cortical and cancellous bones of the mandible as well as the anchorage system components using nonlinear 3D Finite Element (FE) method. The new device is composed of an adjustable stainless steel plate equipped with bracket and mounted with two titanium mini-screws into the mandible. The response of this new system was compared to an isolated mini-screw system under different loading scenarios. A maximum of 500gr force was applied in different directions on the bracket and the isolated mini-screw head to simulate the orthodontic loading. Using the new anchorage device reduced von-Mises stress in the whole structure approximately by 50% comparing to the isolated mini-screw. In the cortical bone and depending on the direction of the applied force, von-Mises stress decreased from 6 to 3MPa under vertical shear force and from 6 to 1.5MPa under horizontal and inclined shear forces. In the cancellous bone the stress decreased similarly as in the cortical bone from 0.6 to ≈0.3MPa under horizontal and inclined shear. Under vertical shear force the decrease was less significant from 0.57MPa to 0.5MPa. This new device while offering wide fields of orthodontic forces applications thanks to its bracket provides the same resistive force (500gr) as the isolated mini-screw with much lower stresses in the bone and anchorage implant as well. The next step is to investigate the efficiency of this new device in the teeth movement.
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Wang, Chunyan, Jun Zhang, and Xiaofei Wang. "Multi-Body Contact Finite Element Analysis of Teeth and Orthodontic Devices." In 2009 2nd International Conference on Biomedical Engineering and Informatics. IEEE, 2009. http://dx.doi.org/10.1109/bmei.2009.5305364.
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Taghadosi, Mansour, Lutfi Albasha, Amer Zakaria, Nasir Abdul Quadir, and Nasser Qaddoumi. "Feasibility of employing orthodontic braces as radiating antenna for implantable devices." In 2017 IEEE Asia Pacific Microwave Conference (APMC). IEEE, 2017. http://dx.doi.org/10.1109/apmc.2017.8251490.
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Khonsari, S. K., N. Towhidi, M. Siadat Cheraghi, S. R. Allahkaram, and T. Rabizadeh. "Pt nanoparticles coating on orthodontic Ni-Ti wires using pulse current." In 2011 IEEE Nanotechnology Materials and Devices Conference (NMDC 2011). IEEE, 2011. http://dx.doi.org/10.1109/nmdc.2011.6155278.
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Barone, Sandro, Alessandro Paoli, Armando Viviano Razionale, and Roberto Savignano. "Design of Customised Orthodontic Devices by Digital Imaging and CAD/FEM Modelling." In 3rd International Conference on Bioimaging. SCITEPRESS - Science and Technology Publications, 2016. http://dx.doi.org/10.5220/0005821000440052.
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Sanatkhani, Soroosh, and Prahlad G. Menon. "Three-Dimensional Cephalometric Analysis Using Computed Tomographic Imaging." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88259.
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Successful outcomes from the use of orthodontic devices are underpinned on their effective anchorage and the loading that they apply to the underlying facial structures. Anchorage plays an important role in determining the point of application of the corrective forces and subsequently the orientation of the resultant of these forces, which in-turn governs the outcome of treatment. Therefore, patient-specific design of anchors and their placement may benefit significantly from personalization using patient-specific and three-dimensional (3D) cephalometry. 3D cephalometry is therefore a first step to personalization of orthodontic treatment. In this feasibility study, we demonstrate the viability a novel image processing and surface analysis pipeline to quantify facial symmetry about the mid-sagittal facial plane, which may offer insight into optimal placement and orientation for implantation of orthodontic anchors, starting with patient-specific cone beam computed tomography (CBCT) images. Typical assessments of geometrical features/attributes of face include size, position, orientation, shape, and symmetry. Using 3D CBCT images in the DICOM image format, skull images were first segmented using a basic iso-contouring approach. To quantify symmetry, we split the skull along the mid-sagittal plane and used an iterative closest point (ICP) approach in order to rigidly co-register the left and right sides of the skull, optimizing for rotation, translation and scaling, after reflection of one half across the mid-sagittal plane. This was accomplished using an in-house plugin is developed for the open-source visualization toolkit (VTK) based 3D visualization tool, Paraview (Kitware Inc.). Finally, using a signed regional distance mapping plugin we were able to assess the regional asymmetry of regions of the skull (e.g. upper and lower jaw – specific targets for therapy) using colormaps of regional asymmetry (in terms of left-v/s-right side surface distance) and visualized the same as vector glyphs. The direction of these vectors is synonymous with anticipated regional forces required in order to achieve left-right symmetry, which in-turn may have value in surgical planning for orthodontic implantation. In sum, we demonstrate a workflow for computer-aided cephalometry to assess the symmetry of the skull, which shows promise for personalized orthodontic anchor design.
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Konh, Bardia. "Finite Element Studies of Triple Actuation of Shape Memory Alloy Wires for Surgical Tools." In 2018 Design of Medical Devices Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/dmd2018-6857.
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Since the early discovery in 1951 [1], shape memory alloys (SMAs) have been used in design and development of several innovative engineering systems. SMAs’ unique characteristics have introduced unconventional alternatives in design and development of advanced devices. SMA’s field of applications has covered many areas from aerospace to auto industries, and medical devices [2]. During the past couple of decades, scientists have suggested material models to predict the SMA’s shape memory effect (SME) and its superelastic behavior. The superelastic characteristic of SMAs (its capability to exhibit a large recoverable strain) has been widely used to develop innovative products including biomedical implants such as stents, artificial heart valves, orthodontic wires, frames of indestructible spectacles, etc. However, its actuation capabilities, known as SME, hasn’t been thoroughly expanded. The number of products privileging from SMA’s SME behavior has been very limited. The reason relies on the SMA’s complex material properties that depend on the stress, strain and temperature at every stage of actuation as well as the material’s processing and the thermomechanical loading history.
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Kirana, Siti Salsabila, and Elza Ibrahim Auerkari. "Genotoxicity of NiTi orthodontic wires induced by the release of metal ions." In THE 5TH BIOMEDICAL ENGINEERING’S RECENT PROGRESS IN BIOMATERIALS, DRUGS DEVELOPMENT, AND MEDICAL DEVICES: Proceedings of the 5th International Symposium of Biomedical Engineering (ISBE) 2020. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0047255.
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Ammar, Hussein H., Victor H. Mucino, Peter Ngan, Richard J. Crout, and Osama M. Mukdadi. "Patient-Specific 3D Finite-Element Analysis of Miniscrew Implants During Orthodontic Treatment." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-13068.
Full textAbstract:
Miniscrew implants have seen increasing clinical use as orthodontic anchorage devices with demonstrated stability. The focus of this study is to develop and simulate operative factors, such as load magnitudes and anchor locations to achieve desired motions in a patient-specific 3D model undergoing orthodontic treatment with miniscrew implant anchorage. A CT scan of a patient skull was imported into Mimics software (Materialise, 12.1). Segmentation operations were performed on the images to isolate the mandible, filter out noise, then reconstruct a smooth 3D model. A model of the left canine was reconstructed with the PDL modeled as a thin solid layer. A miniscrew was modeled with dimensions based on a clinical implant (BMK OAS-T1207) then inserted into the posterior mandible. All components were volumetrically meshed and optimized in Mimics software. Elements comprising the mandible bone and teeth were assigned a material based on their gray value ranges in HU from the original scan, and meshes were exported into ANSYS software. All materials were defined as linear and isotropic. A nonlinear PDL was also defined for comparison. For transverse forces applied on the miniscrew, maximum stresses increased linearly with loading and appeared at the neck or first thread and in the cortical bone. A distal tipping force was applied on the canine, and maximum stresses appeared in the tooth at the crown and apex and in the bone at the compression surface. Under maximum loading, stresses in bone were sufficient for resorption. The nonlinear PDL exhibited lower stresses and deflections than the linear model due to increasing stiffness. Numerous stress concentrations were seen in all models. Results of this study demonstrate the potential of patient-specific 3D reconstruction from CT scans and finite-element simulation as a versatile and effective pre-operative planning tool for orthodontists.