Cambios morfológicos en la mandíbula durante la ontogenia: un aporte desde la Histología y la Morfometría Geométrica / Morphological changes in the human mandible during ontogeny: insights from Histological and Geometric Morphometric Analyses

  • Natalia Brachetta Aporta Universidad Nacional de La Plata. Argentina
  • Paula N. Gonzalez
  • Valeria Bernal
  • Cayetana Martinez-Maza

Resumen

El análisis de la morfología craneofacial durante la ontogenia es una línea central en los estudios evolutivos, del desarrollo y biomédicos. El complejo craneofacial ha sido estudiado desde dos perspectivas: el análisis de la forma y el tamaño mediante morfometría lineal y geométrica, y el estudio de los procesos subyacentes mediante el análisis histológico de la superficie del hueso. El objetivo de este trabajo es integrar estas dos líneas para analizar los cambios morfológicos de la mandíbula y ofrecer un modelo de crecimiento que dé cuenta de los mismos. Se analizó una muestra de mandíbulas humanas de individuos subadultos y adultos de procedencia europea. La variación en forma fue registrada a partir de coordenadas de landmarks y análisis de regresión sobre el tamaño. Los campos de formación y reabsorción ósea fueron identificados sobre réplicas de alta resolución de la superficie ósea. Los resultados indican que la variación a escala anatómica descrita mediante técnicas morfométricas fue, en líneas generales, concordante con la inferida a partir de la distribución de las áreas de modelado óseo. Sin embargo, cambios importantes como los movimientos de rotación de la mandíbula con el crecimiento sólo pudieron detectarse a través del análisis morfométrico. Asimismo, ambos tipos de datos mostraron diferencias en las direcciones de cambio inferidas para la sínfisis mandibular. Este trabajo señala la importancia de integrar datos histológicos y morfométricos para comprender los patrones y procesos de cambio morfológico en la ontogenia.

PALABRAS CLAVE crecimiento; modelado óseo; forma y tamaño

 

The analysis of craniofacial morphology during ontogeny has a central role in evolutionary, developmental, and biomedical studies. The craniofacial complex has been studied from two main perspectives: the analysis of its shape and size by means of linear and geometric morphometrics, and the study of underlying processes through histological analysis of the bone surface. The aim of this work is to integrate these two lines of evidence to analyze the morphological changes of the mandible and provide a growth model that can account for such changes. We analyzed a sample of human mandibles from subadult and adult individuals of European origin. Shape changes were analyzed using landmark coordinates and regressions of shape coordinates on size. Areas of bone formation and resorption were identified on high-resolution replicas of the bone surface. The results indicate that variation at the anatomical scale, as described by morphometric techniques, is broadly consistent with that inferred from the distribution of the areas of bone modeling. However, important changes such as growth-related rotational movements of the mandible could only be detected through morphometric analysis. Also, both types of data showed differences in the directions of change inferred for the mandibular symphysis. This work highlights the importance of integrating histological and morphometric data to understand the patterns andprocesses of morphological change in ontogeny.

KEY WORDS growth; bone modeling; size and shape

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Publicado
2015-12-17
Cómo citar
Brachetta Aporta, N., Gonzalez, P. N., Bernal, V., & Martinez-Maza, C. (2015). Cambios morfológicos en la mandíbula durante la ontogenia: un aporte desde la Histología y la Morfometría Geométrica / Morphological changes in the human mandible during ontogeny: insights from Histological and Geometric Morphometric Analyses. Revista Argentina De Antropología Biológica, 18(2). Recuperado a partir de https://revistas.unlp.edu.ar/raab/article/view/2515
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