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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Effects of comprehensive orthodontic treatment with distalization of maxillary molars on the mandibular dentition

Wu, Lihsin 29 July 2020 (has links)
INTRODUCTION: Non-extraction Class II malocclusion treatments often employ the use of maxillary dentition distalization mechanics. The rationale behind these mechanics is to treat the sagittal position of the maxillary dentition to the mandibular dentition. As anchorage loss may occur after distalization of molars, inter-arch mechanics are often used during comprehensive treatment that may manifest in the finish as a more protrusive lower dentition. OBJECTIVE: To evaluate the efficacy of several distalization modalities, used as part of comprehensive orthodontics, by measuring the overall effects on the dentition and soft tissue. MATERIALS AND METHODS: Four different modalities of distalization treatment of Class II malocclusion were compared regarding dental and soft tissue changes: Distal Jet (n=26), Horseshoe Jet (n=26), Pendulum (n=26), and the MGBM (Maino, Giannelly, Bernard, Mura) protocol (n=25). The Horseshoe Jet and MGBM methods use miniscrews supported anchorage while the Distal Jet and pendulum do not. The majority of the pendulum subjects (24 of 26) were prescribed headgear wear. For each of the groups, lateral cephalograms were taken before treatment and after comprehensive treatment. RESULTS: Minimal differences in soft tissue changes between the groups were found; however, significant (p≤0.05) differences in dental changes between groups for lower incisor, upper incisor, and upper first molar sagittal positions were found. Lower incisors showed significant protrusion and proclination for the Distal Jet experimental group (p<0.05). The upper incisor showed the greatest uprighting and retraction (p<0.05) in the pendulum group and the most proclination (p<0.01) in the Horseshoe Jet group. CONCLUSION: Three out of four experimental groups showed some amount of lower incisor protrusion and/or proclination. Bone anchored modalities had reduced side effects on the lower incisors, with the Horseshoe Jet showing less change than Distal Jet (p=0.05) and the MGBM group showing no significant change. The pendulum group had the greatest upper incisor retraction and showed negligible lower incisor proclination with only 1 out of 6 measurements showing significance.
2

Efeitos cefalométricos produzidos pelo uso do distalizador Carrière após a distalização de molares / Cephalometric Effects of Carrière Distalizer for upper molar distalization

Cabrera, Laura de Castro 07 February 2011 (has links)
Este estudo objetivou estudar os efeitos cefalométricos promovidos pelo uso do Distalizador Carrière para a distalização de molares superiores. Este aparelho intrabucal foi desenvolvido por Luís Carrière e representa uma evolução dos Arcos Seccionais Modulares. Este estudo compreendeu 22 pacientes, com idade média inicial de 14,33 anos, idade média final de 14,89 anos e tempo médio de tratamento de 0,56 anos. Foram avaliadas 44 telerradiografias em norma lateral de todos os pacientes, nas fases pré e pós-distalização de molares superiores para a correção da má oclusão de Classe II, sem extrações. Empregou-se o teste t de Student pareado para realização da análise intragrupo, que verificou as variações de um mesmo paciente nas fases pré e pós-distalização. O valor crítico foi considerado ao nível de significância de 0,05 para todas as análises realizadas. Os resultados demonstraram uma diminuição significante da relação maxilomandibular linearmente (Wits) e uma aumento significante do altura facial em milímetros (AFAI). Nos componentes dentários pode-se observar que os primeiros pré-molares superiores apresentaram uma leve distalização (4-PTV), porém a inclinação (4.SN) destes dentes foi significantemente maior. Os molares superiores apresentaram inclinação (6.SN), intrusão (6-PP) e distalização (6-PTV) significantes. Os incisivos inferiores (IMPA, 1-PTV, 1-NB, 1.NB) protruíram e vestibularizaram-se significativamente, bem como o molar inferior apresentou mesialização (6-PTV) e extrusão (6-GoMe) significante. A relação dentária ântero-posterior se mostrou bastante diminuída, melhorando a relação molar e os trespasses vertical e horizontal. Adicionalmente, observou-se que a taxa de distalização mensal dos primeiros molares superiores foi de 0,27 mm por mês. / The Carriere Distalizer is a relatively new intraoral distalizing appliance developed by Dr. Luìs Carrière. The appliance represents an evolution of the modular segmented arch technique. Although impressive clinical results have been demonstrated with the Carriere Distalizer, no scientific research has been performed to date. Therefore, the goal of this study was to evaluate the cephalometric effects of the Carrière Distalizer while correcting Class II malocclusions without extractions. The sample consisted of 22 patients with a mean age of 14.33 years. For each patient, a cephalometric radiograph was evaluated for the Carriere Distalizer treatment period (pre-treatment and post-treatment), which averaged 0.56 years. Both the skeletal and dentoalveolar components were evaluated. The pre- and posttreatment values were compared using a student t test with a significance value of 0.05. For the skeletal components, the results revealed a significant decrease in the anteroposterior skeletal discrepancy (wits measurements) and a significant increase in the lower anterior face height (AFAI). For the dentoalveolar components, the upper first premolars distalized slightly, but with more distal tipping (4.SN) than translation (4-PTV). The upper molars underwent significant distal tipping (6.SN), translation (6- PTV), and intrusion (6-PP), although the distal translation was slightly less. The lower incisors proclined (IMPA, 1-PTV, 1-NB, 1.NB) significantly. The lower first molars also showed significant mesial movement (6-PTV) and extrusion (6-GoMe). The monthly distalization rate of the Carrière Distalizer was 0.27 mm per month for the upper first molar and 0.17mm per month for the upper second molar. The molar relationship, overjet, and overbite all underwent a significant correction resulting in a Class II to a Class I correction.
3

Efeitos cefalométricos produzidos pelo uso do distalizador Carrière após a distalização de molares / Cephalometric Effects of Carrière Distalizer for upper molar distalization

Laura de Castro Cabrera 07 February 2011 (has links)
Este estudo objetivou estudar os efeitos cefalométricos promovidos pelo uso do Distalizador Carrière para a distalização de molares superiores. Este aparelho intrabucal foi desenvolvido por Luís Carrière e representa uma evolução dos Arcos Seccionais Modulares. Este estudo compreendeu 22 pacientes, com idade média inicial de 14,33 anos, idade média final de 14,89 anos e tempo médio de tratamento de 0,56 anos. Foram avaliadas 44 telerradiografias em norma lateral de todos os pacientes, nas fases pré e pós-distalização de molares superiores para a correção da má oclusão de Classe II, sem extrações. Empregou-se o teste t de Student pareado para realização da análise intragrupo, que verificou as variações de um mesmo paciente nas fases pré e pós-distalização. O valor crítico foi considerado ao nível de significância de 0,05 para todas as análises realizadas. Os resultados demonstraram uma diminuição significante da relação maxilomandibular linearmente (Wits) e uma aumento significante do altura facial em milímetros (AFAI). Nos componentes dentários pode-se observar que os primeiros pré-molares superiores apresentaram uma leve distalização (4-PTV), porém a inclinação (4.SN) destes dentes foi significantemente maior. Os molares superiores apresentaram inclinação (6.SN), intrusão (6-PP) e distalização (6-PTV) significantes. Os incisivos inferiores (IMPA, 1-PTV, 1-NB, 1.NB) protruíram e vestibularizaram-se significativamente, bem como o molar inferior apresentou mesialização (6-PTV) e extrusão (6-GoMe) significante. A relação dentária ântero-posterior se mostrou bastante diminuída, melhorando a relação molar e os trespasses vertical e horizontal. Adicionalmente, observou-se que a taxa de distalização mensal dos primeiros molares superiores foi de 0,27 mm por mês. / The Carriere Distalizer is a relatively new intraoral distalizing appliance developed by Dr. Luìs Carrière. The appliance represents an evolution of the modular segmented arch technique. Although impressive clinical results have been demonstrated with the Carriere Distalizer, no scientific research has been performed to date. Therefore, the goal of this study was to evaluate the cephalometric effects of the Carrière Distalizer while correcting Class II malocclusions without extractions. The sample consisted of 22 patients with a mean age of 14.33 years. For each patient, a cephalometric radiograph was evaluated for the Carriere Distalizer treatment period (pre-treatment and post-treatment), which averaged 0.56 years. Both the skeletal and dentoalveolar components were evaluated. The pre- and posttreatment values were compared using a student t test with a significance value of 0.05. For the skeletal components, the results revealed a significant decrease in the anteroposterior skeletal discrepancy (wits measurements) and a significant increase in the lower anterior face height (AFAI). For the dentoalveolar components, the upper first premolars distalized slightly, but with more distal tipping (4.SN) than translation (4-PTV). The upper molars underwent significant distal tipping (6.SN), translation (6- PTV), and intrusion (6-PP), although the distal translation was slightly less. The lower incisors proclined (IMPA, 1-PTV, 1-NB, 1.NB) significantly. The lower first molars also showed significant mesial movement (6-PTV) and extrusion (6-GoMe). The monthly distalization rate of the Carrière Distalizer was 0.27 mm per month for the upper first molar and 0.17mm per month for the upper second molar. The molar relationship, overjet, and overbite all underwent a significant correction resulting in a Class II to a Class I correction.

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