Comparative evaluation of the anatomical development of the temporomandibular joint, by means of magnetic resonance, digital econstruction and histological sections. / "Avaliação comparativa da anatomia do desenvolvimento da articulação temporomandibular, por meio do uso de ressonância magnética, reconstrução digital e cortes histológicos"

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The present study was carried out to evaluate the effectiveness of Magnetic Resonance Imaging (MRI) and bi and three-dimensional digital reconstructions of the TMJ in different stages of development, by the comparison with histological sections. A proper protocol of IRM examination was developed, which was applied in formalin-preserved human embryos and fetuses, ranging from 22 to 160mm of crown-rump length (CRL), between 7 and 18 weeks of intrauterine life (IU). Two sequences of sagital images of the entire head of each specimen were performed, with interslice gap of 1,0mm. Consequently, images were digitally intercalated, creating a slice sequence of 0,5mm of interslice gap. These images were imported to the MRIcro Ò program for bi and three-dimensional digital reconstruction. In order to evaluate the development of the articular structures of each one of the specimens, histological sections of the TMJ were obtained. The maturation’s degree and the quality of the collagen matrix of the TMJ were determined by the histological sections . The results showed that the developed protocol was capable of capture and process MR images, mainly in the articular maturation stage, after the 13 th week of IU. Histological findings also showed that articular structures are better identified in this stage by RMI examination. This can be explained due to an increase of cellular and collagen matrix differentiation, which undergoes conversion from collagen type III to type I. Bi and three-dimensional models seem to be an efficient tool for the diagnosis of facial development, facilitating its understanding and learning. Further studies and technological advances may be necessary for its application in TMJ’s structures in intrauterine period.

ASSUNTO(S)

articulação temporomandibular magnetic resonance-3d embriologia-atm embryology-tmj ressonância magnética–fetos magnetic resonance-fetuses histology-fetus magnetic resonance-tmj development-tmj desenvolvimento–atm ressonância magnética-3d imagem tridimensional–atm temporomandibular joint ressonância magnética-atm three-dimensional-image-tmj histologia–fetos

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