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      Evaluación Morfométrica Directa de la Asimetría Condilar sobre Mandíbulas Humanas Translated title: Direct Morphometric Evaluation of Condylar Asymmetry on Human Mandibles

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          Abstract

          La asimetría condilar (AC) es una alteración morfológica estructural considerada un importante factor de riesgo para los trastornos de la articulación temporomandibular. Diversas técnicas evalúan la AC, principalmente basadas en mediciones sobre radiografías panorámicas, dado su amplio uso. Sin embargo, los métodos sobre radiografías no son muy sensibles por la magnificación, distorsión, superposición de estructuras y posicionamiento mandibular. El objetivo de este estudio fue determinar los valores reales de los índices de asimetría condilar para una muestra normal con medición directa sobre mandíbulas humanas. Se utilizaron 30 mandíbulas humanas adultas secas pertenecientes a población chilena, y la asimetría condilar fue evaluada las técnicas de Habets y de Kjellberg, y se realizaron los análisis descriptivos de los valores promedios, desviación estándar, mínimo y máximo y los índices de asimetría/simetría de cada método. Según el índice de asimetría condilar de Habets 7 casos (un 23,3%) mostraron valores superiores a un índice de 3% de asimetría, con un rango entre 3,64 y 27,26%. Los parámetros morfológicos del lado derecho e izquierdo no mostraron diferencias significativas (p < 0,05). Según el índice de simetría de Kjellberg, 19 casos (63,3%) mostraron valores inferiores al 93% y fueron clasificados como asimétricos. Los parámetros morfológicos del lado derecho e izquierdo tampoco mostraron diferencias significativas. Al comparar las asimetrías reportadas con ambos métodos, sólo en 4 casos hubo una coincidencia de diagnóstico. Al eliminar factores de distorsión y angulación en las mediciones realizadas, se confirma la existencia de asimetría vertical entre los cóndilos mandibulares del lado derecho e izquierdo, y por otra parte, es evidente que hay diferencias en los valores de asimetría debido a los diferentes métodos utilizados. Sin embargo, todavía no está claro que la asimetría condilar puede considerarse fisiológica.

          Translated abstract

          The condylar asymmetry (CA) is a structural morphological alteration considered an important risk factor for temporomandibular joint disorders. CA can be evaluate by various techniques, mainly based on measurements on panoramic radiographs, given their wide use. However, the methods of x-rays are not very sensitive due to the magnification, distortion, overlapping structures and mandibular positioning. The aim of this study was to determine the values of condylar asymmetry for normal sample by direct measurement in human jaws. Thirty adult human dry mandibles belonging to Chilean population were used. The condylar asymmetry was evaluated by Habets and Kjellberg techniques, and descriptive analysis of mean, standard deviation, minimum and maximum values, and asymmetry/symmetry indexes were performed of each method. According to the Habets' index, 7 cases (23.3%) showed a higher rate of 3% asymmetry, with a range between 3.64% and 27.26%. The morphological parameters of the right and left side showed no significant differences. According to the symmetry Kjellberg's index, 19 cases (63.3%) showed values lower to 93% and were classified as asymmetric. The morphological parameters of the right and left side also showed no significant differences (p<0.05). When comparing the asymmetries reported by both methods, only 4 cases there was diagnostic agreement. By eliminating factors of distortion and angulation on measurements, the existence vertical asymmetry between mandibular condyles of the right and left side is confirmed, and on the other hand, it is clear that there are differences in the values of the asymmetry due to the different methods used. However, it is still unclear that condylar asymmetry can be considered physiological.

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                ijmorphol
                International Journal of Morphology
                Int. J. Morphol.
                Sociedad Chilena de Anatomía (Temuco )
                0717-9502
                December 2013
                : 31
                : 4
                : 1401-1406
                Affiliations
                [1 ] Universidad de La Frontera Brazil
                [2 ] Universidad Autónoma de Chile Chile
                [3 ] Pontificia Universidad Católica de Chile Chile
                [4 ] Universidad de la Frontera Brazil
                Article
                S0717-95022013000400041
                10.4067/S0717-95022013000400041
                Product
                Product Information: website
                Categories
                ANATOMY & MORPHOLOGY

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