Evaluación de la AsimetrÃa Vertical Mandibular, en Pacientes con Mordida Cruzada Posterior Uni y Bilateral
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Date
2012
Profesor/a GuÃa
Facultad/escuela
Idioma
es
Journal Title
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Volume Title
Publisher
2014 Sociedad Chilena de AnatomÃa
Nombre de Curso
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Abstract
El objetivo fue determinar la existencia de asimetrÃa vertical mandibular, en pacientes con mordida cruzada posterior uni y bilateral, tanto en dentición mixta primera fase como en permanente completa. Se recolectaron radiografÃas panorámicas correspondientes a 121 pacientes con dentición mixta primera fase y permanente completa, 57 de los cuales, presentaba mordida cruzada unilateral, 21 mordida cruzada bilateral y 43 individuos con oclusión normal, que sirvieron como grupo control. En las radiografÃas, se cuantificaron medidas lineales de altura condilar, coronoidea, de rama, cóndilo-más-rama y la diferencia entre las alturas de cóndilo y coronoides. Además, se calcularon los Ãndices de asimetrÃa para cada una de dichas estructuras. Se determinó la existencia de diferencias significativas entre los grupos, mediante el cálculo de los test Mann-Whitney y Kruskal-Wallis, dada la distribución de las variables y un test de chi cuadrado para evaluar asociación entre las mismas, con un intervalo de confianza de 95% (p<,05). Existen diferencias significativas entre los Ãndices de rama y de cóndilo-más-rama, entre el grupo control y el grupo con mordida cruzada unilateral (MCU), al igual que en el Ãndice coronoideo, entre el grupo control y el grupo con mordida cruzada bilateral. El grupo con MCU, presentó un mayor porcentaje de pacientes con asimetrÃa de cóndilo y rama, encontrándose una leve asociación entre la condición de mordida cruzada unilateral y la asimetrÃa de dichas estructuras. Dados los resultados, se puede concluir que existe asimetrÃa en el cóndilo, coronoides y en cóndilo-menos-coronoides y coronoides, tanto en pacientes con mordida cruzada uni como bilateral. Sin embargo, el grupo con MCU presenta un mayor porcentaje de pacientes con asimetrÃa de cóndilo y rama, existiendo una leve asociación entre MCU y asimetrÃa de dichas estructuras.
SUMMARY: The aim was to evaluate the mandibular vertical asymmetry, in unilateral and bilateral posterior crossbite patients both in permanent and mixed dentition. One hundred twenty one panoramic radiographs were collected, 57 from patients with unilateral posterior crossbite, 21 patients with bilateral posterior crossbite and 43 with normal occlusion that were used as a control group. Subsequently, reference points and cephalometric traces were drawn manually by a calibrated examiner in order to register the condylar, coronoideal, and ramal heigths. This data was used to calculate an asymmetry index for each structure. According to the distribution of the variables, Mann-Whitney and Kruskal-Wallis test was used to compare the data between groups of patients and chi square was used to evaluate association between them, at the 95% confidence interval (p<.05). Statistically significant differences were found in the ramal and condylar-plus-ramal asymmetry index values, between the control and the unilateral posterior crossbite group, also statistical differences were found in the coronoideal index values, between the control and the bilateral posterior crossbite groups. On the other hand, the bilateral crossbite group, presented a higher percentage of patients with condylar and ramal asymmetry, finding a mild statistically significant association between this condition and those with asymmetry. Condylar and coronoideal asymmetry was found both in the unilateral as in the unilateral posterior crossbite patients. The bilateral crossbite group, presented a major percentage of patients with asymmetry, with a mild association between those conditions. KEY WORDS: Crossbite; Condylar asymmetry; Mandibular asymmetry; Orthopantomograph.
SUMMARY: The aim was to evaluate the mandibular vertical asymmetry, in unilateral and bilateral posterior crossbite patients both in permanent and mixed dentition. One hundred twenty one panoramic radiographs were collected, 57 from patients with unilateral posterior crossbite, 21 patients with bilateral posterior crossbite and 43 with normal occlusion that were used as a control group. Subsequently, reference points and cephalometric traces were drawn manually by a calibrated examiner in order to register the condylar, coronoideal, and ramal heigths. This data was used to calculate an asymmetry index for each structure. According to the distribution of the variables, Mann-Whitney and Kruskal-Wallis test was used to compare the data between groups of patients and chi square was used to evaluate association between them, at the 95% confidence interval (p<.05). Statistically significant differences were found in the ramal and condylar-plus-ramal asymmetry index values, between the control and the unilateral posterior crossbite group, also statistical differences were found in the coronoideal index values, between the control and the bilateral posterior crossbite groups. On the other hand, the bilateral crossbite group, presented a higher percentage of patients with condylar and ramal asymmetry, finding a mild statistically significant association between this condition and those with asymmetry. Condylar and coronoideal asymmetry was found both in the unilateral as in the unilateral posterior crossbite patients. The bilateral crossbite group, presented a major percentage of patients with asymmetry, with a mild association between those conditions. KEY WORDS: Crossbite; Condylar asymmetry; Mandibular asymmetry; Orthopantomograph.
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Indexación: Web of Science; Scielo
Keywords
Crossbite; Condylar asymmetry; Mandibular asymmetry; Orthopantomograph, Mordida cruzada posterior; AsimetrÃa condilar; AsimetrÃa mandibular; OrtopantomografÃa.
Citation
International Journal of Morphology. Vol. 30. N° 3, 2012.