Avaliação das mudanças tegumentares naturais e induzidas pelo aparelho de Herbst, em indivíduos com má oclusão classe II, divisão 1, na fase da dentadura mista
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Data
2013-03-11
Autores
Landázuri, Denise Rocha Goes [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
O objetivo desse estudo cefalométrico prospectivo foi avaliar a influência do tratamento precoce com o aparelho Herbst, associado ao Trainer for Kids (T4K), utilizado como contenção, nas alterações do perfil facial. Uma amostra de 44 indivíduos, na fase da dentadura mista e com má oclusão Classe II divisão 1 foi dividida em 2 grupos: grupo tratado com o aparelho Herbst (n=22; média de idade inicial 8,9 anos) e grupo controle, acompanhado sem tratamento, (n=22; média de idade inicial 8,7 anos). Os grupos foram pareados quanto ao gênero e às idades ósseas e cronológicas. Para cada paciente do grupo tratado foram realizadas telerradiografias laterais denominadas: T1- inicial, T2- após 7 meses de tratamento e T3- 1 ano após a remoção do aparelho Herbst. No grupo controle, as radiografias foram tomadas anualmente, sendo convertidas em meses para efeitos de comparação. A análise estatística foi realizada por meio do teste t de Student (p<0,05). Os resultados mostraram que o aparelho Herbst promoveu redução significante da convexidade do perfil facial tegumentar e esquelético, aumento significante do ângulo mentolabial, além da projeção anterior e significante do lábio inferior e pogônio tegumentar. Após a fase de contenção com o T4K, observamos recidiva significante e parcial da convexidade do perfil facial tegumentar. Concluímos que o uso associado dos aparelhos Herbst e T4K, na dentadura mista, alterou positivamente o perfil facial, tornando-o menos convexo. Contudo, os efeitos mais significativos foram verificados logo após o uso do aparelho Herbst, sendo mais evidentes na região do lábio inferior e mento
The purpose of this prospective cephalometric study was to evaluate the influence of early treatment with the Herbst appliance followed by retention with a prefabricated positioner, Trainer for Kids (T4K), on facial profile changes. The sample consisted of 44 Class II division 1 patients, in the mixed dentition stage, which were divided into two groups: treated group (n=22; initial mean age of 8.9 years) and control group, not treated orthodontically, (n=22; initial mean age of 8.7 years). Both groups were paired according to gender as well to osseous and chronological ages. Three lateral cephalograms were taken and grouped as: T1- baseline; T2- after 7 months of treatment; T3- 1 year after Herbst appliance removal. In the control group, the radiographs were taken annually and converted to months for comparison. Statistical analysis was performed with Student’s t test, at significance level of 5%. The results showed that the Herbst appliance promoted a significant reduction on skeletal and soft tissue facial profile convexity, a significant increase of the mentolabial angle, as well as a significant protrusion of the lower lip and the soft pogonion. After T4K retention phase, we observed a significant and partial relapse on the soft facial profile convexity. We concluded that the Herbst treatment in the mixed dentition, in combination with retention, straightened the facial hard and soft tissue profile, making them less convex. However, the most significant changes were detected immediately after Herbst appliance removal and were mainly on the lower lip and the mentolabial areas
The purpose of this prospective cephalometric study was to evaluate the influence of early treatment with the Herbst appliance followed by retention with a prefabricated positioner, Trainer for Kids (T4K), on facial profile changes. The sample consisted of 44 Class II division 1 patients, in the mixed dentition stage, which were divided into two groups: treated group (n=22; initial mean age of 8.9 years) and control group, not treated orthodontically, (n=22; initial mean age of 8.7 years). Both groups were paired according to gender as well to osseous and chronological ages. Three lateral cephalograms were taken and grouped as: T1- baseline; T2- after 7 months of treatment; T3- 1 year after Herbst appliance removal. In the control group, the radiographs were taken annually and converted to months for comparison. Statistical analysis was performed with Student’s t test, at significance level of 5%. The results showed that the Herbst appliance promoted a significant reduction on skeletal and soft tissue facial profile convexity, a significant increase of the mentolabial angle, as well as a significant protrusion of the lower lip and the soft pogonion. After T4K retention phase, we observed a significant and partial relapse on the soft facial profile convexity. We concluded that the Herbst treatment in the mixed dentition, in combination with retention, straightened the facial hard and soft tissue profile, making them less convex. However, the most significant changes were detected immediately after Herbst appliance removal and were mainly on the lower lip and the mentolabial areas
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Palavras-chave
Má oclusão de Angle Classe II, Aparelhos ortopedicos, Crescimento, Growth
Como citar
LANDÁZURI, Denise Rocha Goes. Avaliação das mudanças tegumentares naturais e induzidas pelo aparelho de Herbst, em indivíduos com má oclusão classe II, divisão 1, na fase da dentadura mista. 2013. 125 f. Tese (doutorado) - Universidade Estadual Paulista Julio de Mesquita Filho, Faculdade de Odontologia (Campus de Araraquara), 2013.