Dissertations / Theses: 'Malocclusion'

1

Oliver, Richard George. "Malocclusion and speech." Thesis, Cardiff University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390247.

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2

Mylchreest, Robert H. O. "Fluoride And Malocclusion." Thesis, Faculty of Dentistry, 1990. http://hdl.handle.net/2123/5025.

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3

Da'as, Thaer Issa. "Factors influencing the impact of malocclusion." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531138.

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4

Howe, Sara Christine. "Phenotypic characterization of Class II malocclusion." Thesis, University of Iowa, 2012. https://ir.uiowa.edu/etd/2896.

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Background: Genes predispose to disproportionate growth of the human face resulting in unbalanced maxillo-mandibular relationships and severe malocclusion. The success of genetic studies aimed at identifying causative genes for complex traits such as malocclusion depends greatly on a well-characterized phenotype to reduce heterogeneity. Purpose: The purpose of this study is to characterize the skeletal and dental variation present in Class II malocclusion into distinct homogenous phenotypic groups to help empower future genetic studies aimed at identifying the etiology of malocclusion. Research Design: Cephalometric radiographic landmarks and statistical data reduction methods will be used to find the most common phenotypic groupings in a sample of 309 Caucasian Class II adults. Results: A principle component analysis produced 7 principle components that explained 81% of the variation and a subsequent cluster analysis identified 5 distinct clusters of Class II patients.

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5

Blackwelder, Aaron Christian. "Association between dietary factors and malocclusion." Thesis, University of Iowa, 2013. https://ir.uiowa.edu/etd/2440.

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Associations Between Dietary Factors and Malocclusion. Blackwelder AC*, Warren JJ, Levy SM, Marshall TA, Bishara SE (University of Iowa, Iowa City, IA) Purpose: Malocclusions, including crowding, have a multifactorial etiology, but it has been suggested that dietary factors may be a risk factor for malocclusion. Thus, the objective was to assess associations between dietary factors and dental crowding in a sample of Iowa Fluoride Study participants. Methods: As participants in the Iowa Fluoride Study, subjects were followed up from birth to 102 months using questionnaires and diet diaries periodically to gather information on dietary intake. Subjects were also examined clinically around age 5 (n=168) and 9 (n=125) with dental casts made to gather information on malocclusion such as Tooth Size Arch Length Discrepancy (TSALD) and Canine Arch Width (CAW), as well as body mass index (BMI). Relationships between dietary factors and malocclusion were assessed. Results: The maxillary and mandibular TSALD values for the age 5 and age 9 exams were correlated with the dietary data. The age 5 maxillary TSALD (1.74 mm) was statistically significant when correlated with kilocalories (P=.031) before and after adjusting for BMI. Further examination of the extreme TSALD values with dietary data was completed using Student's t-test. The age 9 mandibular extreme TSALD value and kilocalories was also statistically significant (P=.028). The age 5 CAW was correlated with the dietary data and kilocalories was also statistically significant (P=.012). Other dietary factors were found to approach statistical significance but were not significant at the alpha=0.05 level. Conclusions: The findings from this study suggest that dietary factors may be associated with crowding of the dentition as measured by TSALD and CAW; however, further research is needed.

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6

Vela, Kaci C. "Phenotypic characterization of class CIII malocclusion." Thesis, University of Iowa, 2012. https://ir.uiowa.edu/etd/3005.

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OBJECTIVE: This study attempts to characterize CIII malocclusion phenotypes in order to identify distinct subgroups for which genetic susceptibility could be identified. METHODS: Sixty-three lateral cephalometric variables were measured from pre-treatment records of 292 CIII Caucasian adults. Principal component analysis (PCA) and cluster analysis (CA) were used to identify the most homogeneous groups of individuals representing distinct CIII phenotypes and thus reducing genetic heterogeneity. RESULTS: PCA resulted in 6 principal components that accounted for 81.17% of the variation. The first three components represented variation on mandibular and maxillary horizontal and vertical position and lower incisor angulation, respectively. The cluster model identified 5 distinct subphenotypes of CIII malocclusion. CONCLUSIONS: A spectrum of phenotypic definitions was obtained which may enhance the identification of human susceptibility genes underlying CIII malocclusion.

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7

Ferreira, Dominique Abergail. "A critique of the index of the complexity, outcome and need." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&amp.

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The development of a uniform method of epidemiological assessment and grading of malocclusion has been of interest for several decades. Recently, Daniels and Richmond (2000) proposed a new orthodontic index namely the Index of Complexity, Outcome and Need (ICON). Their aim was to develop a single index for assessing treatment inputs and outcomes.

The aim of this study was to critique the ICON and to assess to the extent to which each component of the ICON fulfils the ideal requirements of the ideal index as identified in a World Health Organization Report (WHO, 1966). The study was performed in three parts: 1) a gold standard was established to test reliability and validity of the ICON
2) to assess ease of use and simplicity of the index
3) and to test the applicability of the index on patients and study casts. The results showed that the ICON identified 25% of the cases as &lsquo
no treatment&rsquo
, as apposed to the 100% of the gold standard. Validity of the index was shown to be &lsquo
poor&rsquo
for complexity (? = 0.2) and degree of improvement (? = 0.34) and &lsquo
excellent&rsquo
for outcome. Reliability was high for all the components except for treatment need (? = 0.63). This study concluded that except for complexity and degree of improvement, the index performed well with respects to reliability, validity (of treatment outcome), ease of use and simplicity and applicability to patient and study casts.

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8

Gu, Yan. "Diagnostic criteria and effects of early treatment of pseudo class III malocclusion /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21129629.

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9

Burke, Gail M. "The correlation of condylar characteristics to facial morphology and their prediction of treatment outcomes in Class II patients." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq21157.pdf.

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10

Kim, Pius Joon-Young. "Quantitative assessment of Class II malocclusion in mixed dentition." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq21091.pdf.

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11

Burton, Rano. "An investigation into the treatment effects of three orthodontic appliance prescriptions for the correction of Class II division 1 malocclusions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq23239.pdf.

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12

Dueckman, Peter George. "Treatment effect on skeletal class II low angle patients." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0005/MQ30664.pdf.

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13

Danyluk, Ken. "The development of an objective orthodontic treatment-need index." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0023/MQ32092.pdf.

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14

Gluhin, Olga. "Anterior Open-Bite Diagnosis And Treatment." Thesis, The University of Sydney, 1990. http://hdl.handle.net/2123/4863.

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15

Brown, S. S. "Class III Malocclusion - Orthopaedic Treatment In The Deciduous And Mixed Dentitions." Thesis, The University of Sydney, 1986. http://hdl.handle.net/2123/4949.

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16

Agenter, Michael Kelly. "Influence of tooth crown size on malocclusion." View the abstract Download the full-text PDF version (on campus access only), 2008. http://etd.utmem.edu/ABSTRACTS/2008-001-Agenter-index.html.

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Thesis (M.S. )--University of Tennessee Health Science Center, 2008.
Title from title page screen (viewed on March 4, 2008 ). Research advisor: Edward Harris, Ph.D. Document formatted into pages (xvii, 192 p. : ill.). Vita. Abstract. Includes bibliographical references (p. 155-166).

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17

Abu, Alhaija Elham Saleh Jaber. "Class III malocclusion : analysis and growth prediction." Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361352.

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18

Gu, Yan, and 谷岩. "Diagnostic criteria and effects of early treatment of pseudo class IIImalocclusion." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B3123852X.

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19

Daniels, Sheila Meghnot. "Comparison of surgical and non-surgical orthodontic treatment approaches on occlusal and cephalometric outcomes in patients with severe Class II division I malocclusions." Thesis, University of Iowa, 2017. https://ir.uiowa.edu/etd/5449.

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This study aimed to examine end-of-treatment outcomes of severe Class II Division I malocclusion patients treated with surgical or non-surgical approaches. This study tests the hypotheses that occlusal outcomes (ABO-OGS) at end of treatment will be similar while cephalometric outcomes will differ between these groups. A total of 60 patients were included: 20 of which underwent surgical correction and 40 of which did not. The end of treatment ABO-OGS and cephalometric outcomes were compared by Mann-Whitney U tests and multivariable linear regression models. Following adjustment for multiple confounders (age, gender, complexity of case, and skeletal patterns), the final deband score (ABO-OGS) was similar for both groups (23.8 for surgical group versus 22.5 for non-surgical group). Those treated surgically had a significantly larger reduction in ANB angle, 3.4 degrees reduction versus 1.5 degrees reduction in the non-surgical group (p=0.002). The surgical group also showed increased maxillary incisor proclination (p=0.001) compared to candidates treated non-surgically. This might be attributed to retroclination of incisors during treatment selection in the non-surgical group – namely, extraction of premolars to mask the discrepancy. Studies such as this are necessary because they begin to give practitioners view of not only the outcomes of a single treatment plan, but a comprehensive approach by providing evidence of the over-arching treatment used for successful treatment in both groups.

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20

Niederberger, Ana Liesel Guggiari. "Stability of nonextraction Class II malocclusion treatment with elastics." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/25/25144/tde-31082018-183637/.

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The objective of this study was to evaluate the long-term stability after successful nonextraction Class II malocclusion treatment with elastics. A sample of 43 patients with Class II malocclusion was divided into two groups. The elastic group (EG) consisted of 20 patients who were treated with fixed appliances associated with Class II elastics. The headgear group (HG), consisted of 23 patients treated with fixed appliances and extraoral headgear. Pre-, post-treatment, and long-term post-treatment lateral radiographs and dental casts were evaluated. T-tests were used to compare the treatment changes and long-term post-treatment changes between the groups. The groups were matched regarding initial age, time of long-term post-treatment evaluation, initial malocclusion severity, quality of treatment result, and all pretreatment cephalometric variables. Patients of the EG presented greater treatment time, were older at the post-treatment and at the long-term post-treatment evaluation stages. During treatment both groups showed similar changes. Intergroup comparisons of long-term post-treatment changes showed slight mandibular retrusion in the EG and mandibular protrusion in the HG. The maxillary molar showed significant mesialization in the HG group. There were no intergroup significant occlusal differences during the long-term post-treatment period, with exception of the overjet, which maintained stable in the EG and showed improvement in the HG group. Nonextraction Class II malocclusion treatment with elastics or with extraoral headgear have similar long-term post-treatment stability.
O objetivo do presente estudo foi avaliar a estabilidade do tratamento sem extrações da má oclusão de Classe II com elásticos. Uma amostra de 43 pacientes com má oclusão de Classe II foi dividida em dois grupos. O grupo elástico (GE) consistiu em 20 pacientes que foram tratados com aparelho fixo associado a elásticos de Classe II. O grupo controle (GC), consistiu em 23 pacientes tratados com aparelho fixo associado ao aparelho extrabucal. Telerradiografias e modelos iniciais (T1), finais (T2) e pós-tratamento (T3) foram avaliados. Os grupos foram compativéis em relação à idade inicial, tempo de avaliação pós-tratamento, severidade inicial da má oclusão, qualidade do resultado do tratamento e em relação às variáveis cefalométricas prétratamento. Os pacientes do GE apresentaram maior tempo de tratamento, e maior idade ao final e no pós-tratamento. Após o tratamento, ambos os grupos apresentaram alterações semelhantes. Com respeito as alterações no periodo póstratamento, no GE, a mandíbula se mostrou ligeiramente retruida e no GC ocorreu uma ligeira protrusão. Em relação às variáveis dentoalveolares, o molar maxilar mostrou mesialização significativa no GC. Não houve diferenças entre os grupos em relação às alterações oclusais no periodo pós-tratamento, com exceção do overjet, que manteve-se estável no GE e mostrou melhoras no GC. A estabilidade do tratamento de má oclusão de Classe II com elásticos ou com aparelho extrabucal é semelhante.

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21

Souza, Gomes da Fontoura Clarissa. "Candidate gene analyses of craniofacial variation in malocclusion phenotypes." Diss., University of Iowa, 2019. https://ir.uiowa.edu/etd/6860.

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The precise role that genes play in early craniofacial development and postnatal craniofacial growth are essential to understand dento-facial development overall. However, genotype-phenotype correlations between genetic variation of early craniofacial genes and adult craniofacial phenotypes is poorly understood. Thus, this thesis focused on identifying the genetic etiology underlying phenotypic variations present in malocclusion conditions. First, we performed genotype-phenotype association analyses between common variants in 82 craniofacial genes and phenotypic variations extracted from 2D and 3D pre-treatment dental records of individuals with malocclusion. This effort identified that variant rs2189000 upstream of TWIST1 is highly associated with mandibular body length and inclination and cranial base angulations which can lead to malocclusion. Next, via cell based functional assays, we discovered that rs2189000 disrupts a PITX2 binding site and also showed the direct regulation of TWIST1 expression by the PITX2 gene. Finally, we identified abnormal craniofacial phenotypes and malocclusion in Twist1 deleted mice including asymmetric snouts, domed cranial vaults, and changes in size and inclination of the cranial base, palate and mandible resulting in malocclusion and resembling the human phenotypes observed. Also, premature calcification of calvarial sutures and cranial base synchondroses were also observed in the mutant mice indicating a possible biological mechanism for the abnormal phenotypes detected. These results confirm that TWIST1 is an important regulator of postnatal growth and that genetic variation in TWIST1 can result in malocclusion. The continued identification of genetic etiological factors and their role in craniofacial growth will impact treatment and prevention of malocclusion and other craniofacial conditions

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22

Ngesa, James Lwanga. "Applicability of tooth size predictions in the mixed dentition analysis in a Kenyan sample." Thesis, University of the Western Cape, 2004. http://etd.uwc.ac.za/index.php?module=etd&amp.

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23

Heinrichs, Dean. "Treatment effects of the Forsus fatigue resistant device a cephalometric investigation /." Morgantown, W. Va. : [West Virginia University Libraries], 2010. http://hdl.handle.net/10450/10930.

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Thesis (M.S.)--West Virginia University, 2010.
Title from document title page. Document formatted into pages; contains viii, 101 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 83-92).

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24

Do-deLatour, Thuy B. "Effective maxillary protraction hyrax expansion appliance vs. double-hinged expansion appliance /." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10287.

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Thesis (M.S.)--West Virginia University, 2009.
Title from document title page. Document formatted into pages; contains viii, 99 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 83-90).

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25

Chintakanon, Kanoknart. "A prospective study of twin block appliance therapy in children with Class II division 1 malocclusions assessed by MRI, 3D-Cephalometry and muscle testing /." Title page, contents and abstract only, 1999. http://web4.library.adelaide.edu.au/theses/09PH/09phc539.pdf.

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26

Wihardja, Rosy. "Lateral Cephalometric Study Of Indonesian Class II Division 1 Malocclusion." Thesis, Faculty of Dentistry, 1991. https://hdl.handle.net/2123/5087.2.

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Cephalometric radiography has been accepted worldwide as a powerful tool to study craniofacial growth, to diagnose deviations of an individual from population norms, and to plan orthodontic treatment and assess its progress and results, although it is not free from errors. Chung, Runck, Bilben, Kau (1986) state that racial differences in craniofacial morphology are well recognized. Their study shows that the Oriental people including Japanese, Chinese, and Koreans, characterised by larger lateral dimensions Caucasians, as measured by bizygomatic diameter, bigonial diameter, and head breadth. The anteroposterior dimension as measured by head length shows the opposite trend. It is not known what genetic forces are responsible for maintaining these racial differences. As a result, and as also proved by many cephalometric studies on different races, different race gives different appearance cephalometrically too. The aim of this study is to find the pattern of dyscrepancy in Class II division 1 malocclusion in Indonesian people. The Indonesian is the outcome of the intermingling of many ancient races. If the "normal" occlusion of Asian people appears with certain unique cephalometric characteristics when comparison is made with the Caucasians norms, it seems logical to assume that the "abnormal" occlusion will show unique characteristics as well.

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27

Mohammadi, Hamed. "Cephalometric airway measurements in anterior open bite deformity." Thesis, [Hong Kong : Faculty of Dentistry], The University of Hong Kong, 1997. http://sunzi.lib.hku.hk/HKUTO/record/B3862820X.

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28

Martins, Lídia Pimenta [UNESP]. "Análise dos resultados do tratamento da mordida cruzada posterior funcional com o expansor fixo Hyrax." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/95784.

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Objetivo: O objetivo deste estudo clínico controlado foi avaliar os efeitos da expansão da maxila com o aparelho Hyrax modificado sobre a dimensão transversal da maxila em níveis esquelético basal, alveolar e dentário por meio da tomografia computadorizada de feixe cônico. Materiais e Métodos: Oito pacientes com média de idade de 7 anos e 1 mês, portadores de mordida cruzada posterior unilateral funcional foram submetidos a um tratamento ortodôntico por meio de um aparelho expansor fixo, seguindo um protocolo clínico com ativações do parafuso de dois quartos de volta por dia até atingir a sobrecorreção das mordidas cruzadas. Foram obtidas tomografias pré-expansão (T1) e pós-contenção (T2), caracterizado por um período de 5 meses pós-expansão. Sobre estas tomografias foram realizadas medidas da base maxilar, da distância entre as cristas alveolares e da distância intermolares vestibulares e palatinas. Resultados: Os resultados mostraram um aumento percentual em todas as dimensões lineares transversais, com uma diminuição da magnitude dos efeitos dentários (6%) para o osso basal (2,1%). Conclusão: A expansão da maxila foi obtida como efeito geral pós-tratamento, sendo a expansão predominante no aspecto dentário
Purpose: The present controlled clinical trial aimed to investigate the effects of maxillary expansion with modified Hyrax device on the transversal dimension of maxilla in the skeletal, dento-alveolar and dental levels by using a cone beam computerized tomography (CT). Materials and Methods: Eight patients (mean age of 7 years and 1 month) with functional unilateral posterior crossbite were subjected to orthodontic treatment with fixed expansion appliance. The activation of the screw was two-quarter turns per day. CT scan was conducted in the pre (T1) and pos (T2) treatment. The maxillary base, the distance between the alveolar ridges, and the intermolar buccal and palatine distances were measured. Results: An increase of all linear transverse dimensions, decreasing in magnitude from dental (6%) to basal bone (2.1%). Conclusion: Maxillary expansion was observed after treatment in which the dental aspect was the most predominant expanded

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29

Tsang, Wai-ming. "Cephalometric characteristics of anterior open bite and parameters affecting severity." [Hong Kong] : The University of Hong Kong, 1995. http://sunzi.lib.hku.hk/HKUTO/record/B38628144.

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30

曾偉明 and Wai-ming Tsang. "Cephalometric characteristics of anterior open bite and parameters affecting severity." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B38628144.

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31

Montes, Ana Bheatriz Marangoni 1983. "Avaliação das disfunções orofaciais e temporomandibulares, ansiedade e níveis de cortisol salivar em crianças e adolescentes com bruxismo do sono." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287972.

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Orientadores: Maria Beatriz Duarte Gavião, Paula Midori Castelo Ferrua.
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba.
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Resumo: O bruxismo do sono (BS) é uma parafunção caracterizada pelo ranger ou apertar dos dentes, pode causar desgaste dentário e dor, apresenta alta prevalência na infância e é considerado uma resposta física ao estresse, embora esta relação seja controversa. O objetivo deste estudo, composto por dois capítulos, foi avaliar fatores morfológicos, funcionais e fisiológicos em crianças e adolescentes de 7 a 17 anos com sinais e sintomas de BS. O primeiro capítulo, refere-se a um estudo do tipo caso-controle, intitulado "Is sleeping bruxism related to temporomandibular disorders, malocclusion and orofacial dysfunction?", que comparou a presença de disfunção temporomandibular (DTM), maloclusão e disfunção orofacial em indivíduos com e sem BS. Foram avaliados 316 indivíduos, dos quais 52 apresentaram BS, de acordo com os critérios de diagnóstico estabelecidos pela Classificação Internacional de Distúrbios do Sono. O grupo controle foi formado por 104 indivíduos pareados de acordo com a idade, gênero e variáveis corporais. Deste modo, a amostra considerada para este estudo foi composta por 156 indivíduos, com idade média de 10,86±2,32 anos. A DTM foi avaliada pelo Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) (Eixo I). Para a maloclusão utilizou-se o Índice de Necessidade de Tratamento Ortodôntico (IOTN) e para as disfunções orofaciais o instrumento The Nordic Orofacial Test Screnning (NOT-s). Os dados foram submetidos à estatística descritiva, teste de Shapiro- Wilks, testes t de Student para amostras independentes, Mahn-Whitney, Chi-quadrado ou exato de Fisher, quando indicados, com nível de significância de ?=0,05. Os resultados mostraram que a prevalência de BS foi maior no gênero masculino. A presença maloclusão e DTM foi similar em ambos os grupos. No entanto, os escores de NOT-S foram significativamente maiores no Grupo Caso e no gênero feminino. Hábitos, problemas na mastigação, na deglutição e nos músculos mastigatórios foram as alterações mais prevalentes da disfunção orofacial em indivíduos com BS. Concluiu-se que a disfunção orofacial foi mais severa e prevalente em crianças e adolescentes com BS; maloclusão e DTM não apresentaram relação com BS. O segundo estudo, intitulado "Evaluation of sleep bruxism, temporomandibular disorder, anxiety and salivary cortisol levels in children and adolescents," teve como objetivo verificar se havia associação entre BS e fatores emocionais, subjetivamente pela avaliação de sintomas de ansiedade e objetivamente pela quantificação dos níveis de cortisol salivar. Verificou-se a influência de características antropométricas, gênero e DTM. O estudo envolveu 316 indivíduos com idade de 10,64±2,24 anos. Os sintomas de ansiedade foram avaliados com a Escala Multidimensional de Ansiedade para Crianças (MASC). Para avaliação do cortisol salivar coletou-se amostras de saliva estimulada em dois dias alternados, ao acordar, 30 minutos e uma hora após e antes de dormir. A quantificação do cortisol foi realizada pela técnica de enzimaimunoensaio. Para as características antropométricas determinou-se o índice de massa muscular (IMC=peso/altura2). A DTM foi avaliada pelo RDC/TMD. Os resultados foram analisados por meio de estatística descritiva, análise de variância e regressão logística múltipla. Não houve associação significativa entre BS e idade, IMC, DTM, ansiedade e níveis de cortisol salivar. O gênero masculino apresentou maior probabilidade de apresentar BS. Os escores de ansiedade foram significativamente mais altos tanto para o gênero feminino quanto para indivíduos com DTM. Conclui-se que crianças e adolescentes com DTM apresentaram maiores escores de ansiedade em relação aquelas com bruxismo e do grupo controle. Escores de ansiedade foram maiores em meninas, porém meninos foram mais propensos a apresentar BS. O BS não apresentou associação com ansiedade, níveis de cortisol salivar, IMC e DTM
Abstract: Sleeping bruxism (SB) is a parafunction characterized by grinding or clenching of teeth that can cause tooth wear and pain, shows high prevalent in children, and is considered a physical response to stress. The aim of this study, a composite of two chapters, was to evaluate morphologic, functional, and physiological factors in children and adolescents age 7 to 17 years with signs and symptoms of SB. The first chapter refers to a case-control study titled ?Is sleeping bruxism related to temporomandibular disorders, malocclusion, and orofacial dysfunction?? It compared the presence temporomandibular disorders (TMD), malocclusion, and orofacial dysfunction in individuals with and without SB. Three hundred and sixteen subjects were evaluated, of whom 52 presented BS, according to the diagnostic criteria established by The International Classification of Sleep Disorders. The control group was composed of 104 individuals matched by gender, age, and body variables. Thus, the considered sample consisted of 156 subjects, with mean age of 10.86±2.32 years. The TMD was assessed by the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) (Axis I). For malocclusion the study used The Dental Health Component of the Index of Orthodontic Treatment Need (IOTN), and for orofacial dysfunction The Nordic Orofacial Test Screening (NOT-S) was employed. Data were submitted to descriptive statistics, Shapiro-Wilks, Student t test for independent variables, Mahn-Whitney, Chi-square, and Fisher's exact tests, when indicated, with a significance level of ?=0.05. The results showed that the prevalence of SB was higher in the male gender. The presence of malocclusion and TMD was similar in both groups. However, the NOT-S scores were significantly higher for the case group than the control groups, as well as for females. Habits, impairment in chewing, swallowing, and masticatory muscles were the most frequent conditions of orofacial dysfunction in subjects with bruxism. It was concluded that the orofacial dysfunction was more severe and prevalent in children and adolescents with SB; malocclusion and TMD had no relation to SB. The second chapter, ?Evaluation of sleep bruxism, temporomandibular disorders, anxiety, and salivary cortisol levels in children and adolescents,? aimed to verify if there was an association between SB and emotional factors, both subjectively, by evaluating anxiety symptoms, and objectively, by determining the salivary cortisol levels. The influence of the anthropometric characteristic, gender, and TMD was verified. The study involved 316 individual with mean age of 10.64±2.24 years. Anxiety symptoms were assessed with the Multidimensional Anxiety Scale for Children (MASC). For assessment of salivary cortisol, salivary samples were collected on two alternate days: upon waking, 30 minutes and 1 hour after waking, and before sleep. Quantification of cortisol was performed by enzyme immunoassay. For anthropometric characteristics, the body mass index was calculated (BMI=weight/heght2). The TMD was evaluated by the RDC/TMD. The results were analyzed using descriptive statistics, analysis of variance, and multiple logistic regression. No significant relation was found between bruxism, age, BMI, TMD, anxiety, and salivary cortisol levels. Males had a higher probability of having SB. Anxiety scores were higher in females and subjects with TMD. It was concluded that children and adolescents with TMD had higher anxiety scores compared to those in the control group and those with bruxism. Anxiety scores were higher in girls, but boys were more prone to BS. The BS was not associated with anxiety, salivary cortisol levels, BMI, and TMD
Mestrado
Odontopediatria
Mestre em Odontologia

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Abutayyem, Huda. "Psycho-social impacts of malocclusion and orthodontic treatment in adolescent patients." Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1529815/.

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Introduction: Malocclusion may have an impact on psycho-social aspects but the evidence is less clear cut regarding the potential benefits associated with orthodontic treatment. This PhD therefore aimed to study these aspects in 3 chapters: • Systematic review: Aims: To evaluate social, psychological and quality of life changes due to orthodontic treatment. Methods, Results and Conclusions: Six electronic databases were searched and 21 articles included, reporting results of RCTs and observational studies. There was inadequate evidence to support or refute that orthodontic treatment in adolescent patients has positive psychosocial effects. The lack of a universal outcome measure in reporting impacts of orthodontic treatment is an important issue, so efforts must be made to develop this measure. • Prospective controlled longitudinal study: Aims: To study social impacts following functional appliance in adolescent with Class II Division 1 malocclusions and to compare it with a control group of patients of the same age range who had not yet commenced treatment. Methods: Participants completed a questionnaire regarding social impacts before and after functional appliance treatment. Results: 114 patients were recruited, 65 patients in the treatment group and 49 patients in the control group. There was no statistically significant difference between the groups at T2. Conclusions: Based on the questionnaires used, there were no significant social benefits associated with functional appliance treatment. • Qualitative study: Aims: To explore the social impacts of malocclusion in adolescent patients using qualitative methods. Methods: In-depth interviews were conducted and data were analysed using a framework analysis. Results: 12 participants were interviewed and three main themes were identified: Interpersonal relations, feelings regarding facial images and teasing. Conclusions: Although common themes were identified, variation existed with regards to the social effects of malocclusion on an adolescent’s lifestyle. Interviewees reported being repeatedly reminded of their malocclusion; reinforced through teasing and images in different media.

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Shien, Shue Yoke. "Profile changes in class III malocclusion treated with the Begg technique." Thesis, The University of Sydney, 1985. http://hdl.handle.net/2123/4688.

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Ray, Alison. "Phenotypic characterization of class II malocclusion using two dimensional photographic measurements." Thesis, University of Iowa, 2013. https://ir.uiowa.edu/etd/2614.

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Purpose: The purpose of this study is to characterize class II malocclusion phenotypes from orthodontic photographs in an effort to understand variation in the vertical and transverse dimension from the frontal view and also to identify distinct subgroups of homogenous phenotypes that could be correlated to genetic variation in an effort to identify the genetic causes of class II malocclusion phenotypes. Materials and Methods: The study sample included adult class II patients who were seeking treatment at the University of Iowa Orthodontic Graduate Clinic, University of Iowa Hospital Dentistry Clinic or surrounding private practice orthodontic clinics. The sample consisted of 330 Caucasian adult subjects (79 male, 251 female; age range 16-60 years) who met our eligibility criteria. 2D pre-treatment intraoral and extraoral photographs of 330 Class II adults were imported into Dolphin Imaging, version 11.0 (Dolphin Imaging Systems, Chatsworth, Calif). Non-digital photographs were scanned and imported into Dolphin Imaging. A total of 36 measurements were made. Fifteen were made on the extraoral frontal repose photograph, 15 were made on the extraoral smile photograph, and 6 were made on the intraoral frontal photograph. After the measurements were recorded, ratios, or proportions, were calculated from these facial measurements. Data reduction methods, principal component analysis (PCA) and cluster analysis (CA), were used due to the large number of measurement variables. The goal of these statistical tests is to identify the most homogeneous groups of individuals representing distinct class II phenotypes in an effort to reduce genetic heterogeneity. PCA was used to derive quantitative phenotypes and CA to identify phenotypically homogenous groups of individuals. The next goal of this study was to examine how the derived principal components correlate with the intraoral esthetic measurements. Descriptive statistics were derived for the esthetic variables. Pearson and Spearman correlations were used to analyze the relationship between the principle components and the esthetic measures. Results: The principal components analysis revealed that four principal components accounted for nearly 80% of the total variance in the data. The four principal components were used as the basis for the attempted formation of clusters defining subphenotypes of class II malocclusion in our study. The clustering process was repeated to assess cluster over a range for the number of clusters from 2 to 7 clusters. Each fit was examined using the pseudo F statistic, the cubic clustering criterion, and cluster visualization. Unfortunately, none of the clustering models were a good fit for our data based on the cubic clustering criterion and the relationship between the pseudo-F statistic and the cubic clustering criterion. This study shows that there is minimal correlation between the esthetic dental measurements and the phenotypic variables represented by the 4 principal components. Conclusions: A well-characterized class II malocclusion phenotype is crucial to reduce the heterogeneity when trying to find the causative genes for this complex trait. There have been numerous studies identifying environmental and genetic factors that lead to malocclusion, but none have fully characterized the class II phenotype. This study along with past and ongoing studies at the University of Iowa College of Dentistry are committed to fully characterizing the class II malocclusion phenotype using lateral cephalometric measurements, photographic measurements, 3-D cast measurements, and cone beam radiographic measurements. This data, along with DNA and environmental data will be combined to identify the causative gene for developing a class II malocclusion.

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Weaver, Cole Austin. "Candidate gene analysis of 3D dental phenotypes in patients with malocclusion." Thesis, University of Iowa, 2014. https://ir.uiowa.edu/etd/4789.

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Objectives: About 2% of the US population suffers from severe malocclusion discrepancies that are beyond the limits of orthodontics alone. This study explores correlations between 3D malocclusion phenotypes and craniofacial development genes. Methods: CBCTs (124) or digital casts (161) of 285 subjects with skeletal Class I (n=60), II (n=143) and III (n=82) malocclusion were digitized with 48 dental landmarks. 3D coordinates were superimposed prior to Principal Component (PC) analyses to identify symmetric (sym) and asymmetric (asym) aspects of shape variation related to malocclusion. PCs explaining 51%-67% of total shape variation were regressed on 200 variants genotyped within 75 genes adjusting for race, gender, age and data source. Results: Significant correlations (p<0.01) were found for sym variation with BMP3, PITX2, MAFB, SNAl3, FGF8, ABCA4-ARHGAP29, FOXL2 and asym variation PAX7, TBX1, LEFTY1, SATB2, SOX2, TP63 and the 400Kb region containing D1S435. Conclusion: Results suggest genetic pathways associated with malocclusion.

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Chen, Kun, and 陈坤. "Identification of genetic predisposing factors for skeletal class II malocclusions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B45891552.

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Burns, Nikia R. "Class III camouflage treatment a retrospective study /." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5610.

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Thesis (M.S.)--West Virginia University, 2008.
Title from document title page. Document formatted into pages; contains ix, 204 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 136-139).

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Zang-Bodis, John Robert. "Mesiodistal crown size in relation to the risk and severity of malocclusion." View the abstract Download the full-text PDF version, 2009. http://etd.utmem.edu/ABSTRACTS/2009-030-Zang-Bodis-index.htm.

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Thesis (M.S.)--University of Tennessee Health Science Center, 2009.
Title from title page screen (viewed on October 8, 2009). Research advisor: Edward F. Harris, Ph.D. Document formatted into pages (x1vii, 470 p. : ill.). Vita. Abstract. Includes bibliographical references (p. 151-160).

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Sun, Shu Hua. "A Lateral Cephalometric Study Of Chinese And Vietnamese With Class Iii Malocclusion." Thesis, Faculty of Dentistry, 1990. http://hdl.handle.net/2123/4181.

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Caldas, Waleska Trovisco. "Relationship between malocclusion severity and treatment stability in Class II nonextraction treatment." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/25/25144/tde-19072018-144344/.

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Introduction: When planning Class II malocclusion treatment it is importat to consider the magnitude of the anteroposterior discrepancy, the treatment time, the amount of patient compliance needed and also the long-term stability of the results obtained. The aim of this study was to evaluate the Class II malocclusion nonextraction treatment stability, according to the initial anteroposterior discrepancy severity. Methods: Two groups of patients were selected according to the initial malocclusion severity. The Half-cusp Class II Group comprised 30 patients (16 boys, 14 girls) with an initial mean age of 13.15 years (S.D. 3.62) and the Complete Class II Group comprised 30 patients (15 boys, 15 girls) with an initial mean age of 11.99 years (S.D. 1.26). Lateral cephalograms, panoramic radiographs and dental casts were obtained at pretreatment (T1), posttreatment (T2), and at a minimum period of 2 years posttreatment (T3). Intragroup comparisons of changes in variables during the posttreatment period (T3T2) were made with paired t tests. The initial cephalometric characteristics and malocclusion severity, changes during the treatment period and during the posttreatment period were compared between groups using t tests. A multiple linear regression analysis was used to evaluate the influence of pretreatment characteristics and amount of treatment changes in the amount of posttreatment relapse. Results were regarded as significant at p<0.05. Results: During the posttreatment period (T2-T3) there were no significant differences between groups. The occlusal analysis demonstrated a small but significant relapse of molar relationship for both groups. The initial amount of overjet, the severity of canine and molar relationships and the amount of anteroposterior changes during treatment were significantly correlated to the amount of posttreatment molar relationship relapse. When subgroups of patients with matching treatment time were compared, there was significantly greater relapse in molar relationship in the Complete Class II Group. Conclusions: The initial Class II malocclusion anteroposterior discrepancy severity demonstrated a significant influence on the amount of posttreatment relapse. When treated without extractions, complete Class II malocclusion presented greater relapse than a less severe Class II molar relationship.
Introdução: Durante o planejamento do tratamento da má oclusão de Classe II é importante considerar a magnitude da discrepância ântero-posterior, o tempo de tratamento, a necessidade de cooperação do paciente, assim como a estabilidade em longo prazo dos resultados obtidos. O objetivo do presente estudo foi avaliar a estabilidade do tratamento sem extrações da má oclusão de Classe II, de acordo com a severidade da discrepância ântero-posterior inicial. Métodos: Dois grupos de pacientes foram selecionados de acordo com a severidade inicial da má oclusão. O Grupo Meia Classe II compreendeu 30 pacientes (16 meninos, 14 meninas) com idade média inicial de 13,15 anos (D.P. 3,62) e o Grupo Classe II Completa compreendeu 30 pacientes (15 meninos, 15 meninas) com idade inicial média de 11,99 anos (D.P. 1,26). Radiografias em norma lateral, radiografias panorâmicas e modelos de estudo foram obtidos pré-tratamento (T1), pós-tratamento (T2), e após um período mínimo de 2 anos pós-tratamento (T3). As comparações intragrupos das alterações das variáveis durante o período de pós-tratamento (T3-T2) foram realizadas por testes t pareados. As características cefalométricas e severidade da má oclusão inicial, alterações durante os períodos de tratamento e pós-tratamento foram comparadas entre os grupos por testes t. Uma análise de regressão linear múltipla foi conduzida para avaliar a influência das características pré-tratamento e da quantidade de alterações com o tratamento sobre a recidiva pós-tratamento. Os resultados foram considerados significantes para p<0,05. Resultados: Durante o período de pós-tratamento (T2-T3) não foram encontradas diferenças significantes entre os grupos. A avaliação oclusal demonstrou discreta mas significante recidiva da relação molar em ambos os grupos. A severidade inicial da sobressaliência, das relações canino e molar e a quantidade de alteração anteroposterior com o tratamento foram significantemente correlacionadas à recidiva da relação molar. Quando subgrupos de pacientes com tempos de tratamento compatíveis foram comparados, foi encontrada recidiva significantemente maior da relação molar no Grupo Classe II Completa. Conclusões: A severidade da discrepância ânteroposterior inicial da má oclusão de Classe II demonstrou influenciar significantemente a quantidade de recidiva pós-tratamento. Quando tratada sem extrações, a má oclusão de Classe II completa apresentou maior recidiva que uma relação molar Classe II menos severa.

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Wigal, Timothy G. "Long-term follow-up of patients treated with the edgewise crowned Herbst appliance in the mixed dentition." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5621.

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Thesis (M.S.)--West Virginia University, 2008.
Title from document title page. Document formatted into pages; contains xii, 290 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 186-196).

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Becht, Michael P. "A study using 3D cone beam computed tomography to evaluate masseter muscle morphology in observed skeletal malocclusions." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10076.

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Thesis (M.S.)--West Virginia University, 2009.
Title from document title page. Document formatted into pages; contains viii, 88 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 62-66).

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Van, Laecken Ryan. "Treatment effects of the edgewise Herbst appliance a cephalometric and tomographic investigation /." Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2452.

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Thesis (M.S.)--West Virginia University, 2002.
Title from document title page. Document formatted into pages; contains x, 155 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 116-124).

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Lindner, Anders. "Unilateral posterior cross-bite in preschool children with special references to sucking habits a clinical and experimental study /." Stockholm : Kongl. Carolinska Medico Chirurgiska Institutet, 1991. http://catalog.hathitrust.org/api/volumes/oclc/23913354.html.

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Liu, Zhijian. "The impact of malocclusion and its treatment on the life quality of adults." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43278747.

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Lee, Su-ying Alice. "An acoustic and perceptual analysis of /s/ before and after orthognathic surgery." Click to view the E-thesis via HKUTO, 1999. http://sunzi.lib.hku.hk/hkuto/record/B3620996X.

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Thesis (B.Sc)--University of Hong Kong, 1999.
"A dissertation submitted in partial fulfilment of the requirements for the Bachelor of Science (Speech and Hearing Sciences), The University of Hong Kong, May 14, 1999." Also available in print.

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Ribeiro, Tiago Turri de Castro [UNESP]. "Alterações cefalométricas induzidas pelo aparelho de Herbst com dois tipos de ancoragem para maxila." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/95779.

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Universidade Estadual Paulista (UNESP)
O presente estudo avaliou se o tipo de ancoragem maxilar utilizada no aparelho de Herbst tem influência nos efeitos cefalométricos dentários e esqueléticos induzidos pelo seu uso no tratamento da Classe II. Neste estudo retrospectivo, foram avaliadas telerradiografias em norma lateral de 44 pacientes em fase de crescimento, leucodermas, de ambos os gêneros, com má oclusão Classe II Divisão 1ª com deficiência mandibular submetidos a tratamento ortodôntico com aparelho de Herbst. A amostra foi dividida em dois grupos de igual número de acordo com a ancoragem maxilar utilizada, dentossuportada (grupo1) e dentomucossuportada (grupo 2). Em ambos os grupos, para cada indivíduo, foram obtidas duas telerradiografias de perfil em máxima intercuspidação habitual, denominadas: T1, ao início do tratamento e T2, ao final da fase ortopédica tratamento. A análise exploratória dos dados foi feita através do cálculo de medidas resumo (média, mediana e desvio-padrão) e a análise inferencial através do teste não paramétrico de Mann-Whitney com nível de significância de 5%. Os resultados evidenciaram diferenças estatisticamente significantes para as medidas Co-A, Co-Gn, Linha vertical de referência-ponto A (LVR-A), 1.NB, 1-NB, 1/.Pp, IMPA, Linha vertical de referência- molar superior (LVR-M6s), Linha horizontal de referência- molar superior (LHR-M6s) e Linha vertical de referência- incisal do incisivo inferior (LVR-Iii). O grupo 1, com ancoragem maxilar reduzida, exibiu maiores efeitos na restrição do crescimento da maxila e apresentou distalização dos molares superiores, enquanto que no grupo 2, com ancoragem maxilar total, os efeitos foram maiores no estímulo do crescimento da mandíbula, na verticalização dos incisivos superiores e vestibularização dos incisivos inferiores
The present study evaluated if the type used in the anchor jaw Herbst appliance has an influence on cephalometric dental and skeletal effects induced by its use in the treatment of Class II. In this retrospective study were evaluated in lateral cephalograms of 44 patients pre pubertal stage, Caucasian, of both genders, with Class II division 1 subjects with mandibular deficiency undergoing orthodontic treatment with the Herbst appliance. The sample was divided into two equal groups according to the jaw used anchorage, tooth-supported (group1) and toothtissue- supported (group 2). In both groups, for each individual, we obtained two lateral cephalograms at maximum intercuspation, called T1, the start of treatment and T2, the end of treatment. To evaluate the results were used descriptive and deductive approaches. Exploratory analysis of data was done by calculating summary statistics and inferential analysis using the nonparametric Mann- Whitney test with significance level of 5%. The results showed statistically significant differences for measures Co-A, Co-Gn,-line vertical reference point A (LVR-A), 1.NB, 1-NB, 1/.Pp, IMPA, vertical reference line-upper-molar (LVRM6s) horizontal reference line-upper-molar (LHR-M6s) and vertical reference line, the lower incisor incisal (LVR-Iii). Group 1 with low maxillary anchor, suffered greater effects on the maxilla growth restriction and presented distalization of maxillary molars, whereas in group 2 the effect was greatest in stimulating growth of the mandible, the verticalization of the upper incisors and proclination lower incisor

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Tournemine, Sylvain Renaudin Stéphane. "Orthodontie sur parodonte réduit." [S.l.] : [s.n.], 2005. http://theses.univ-nantes.fr/thesemed/CDtournemine.pdf.

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Du, Xi. "Skeletal, dental and muscular effects in class II division 1 malocclusion treated by Herbst appliance /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21129447.

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Tse, Pui-yee Agnes. "Long-term follow-up in early treatment of Class III." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25314142.

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Dissertations / Theses on the topic 'Malocclusion'

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