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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

MORPHOLOGICAL ALTERATIONS IN THE MASSETER MUSCLE INDUCED BY UNILATERAL EXTRACTION OF THE UPPER MOLARS IN GUINEA PIGS (Cavia porcellus)

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Author(s):
João Paulo Mardegan Issa [1] ; Mamie Mizusaki Iyomasa [2] ; Cristina Ioshie Mizusaki [3] ; Ii-sei Watanabe [4] ; Carlos Alberto Mandarim de Lacerda [5]
Total Authors: 5
Affiliation:
[1] State University of São Paulo (USP). Department of Morphology, Stomatology and Physiology, Ribeirão Preto School of Dentistry - Brasil
[2] State University of São Paulo (USP). Department of Morphology, Stomatology and Physiology, Ribeirão Preto School of Dentistry - Brasil
[3] Federal University of Santa Catarina. Biological Science Center - Brasil
[4] State University of São Paulo (USP). Biomedical Science Institute - Brasil
[5] State University of Rio de Janeiro. Department of Morphology, Medical Center - Brasil
Total Affiliations: 5
Document type: Journal article
Source: INTERNATIONAL JOURNAL OF MORPHOLOGY; v. 22, n. 3, p. 225-230, 2004-00-00.
Abstract

The objective of the present study was to analyze morphological aspects of the structures of the stomatognathic system and their relationship with malocclusion. For this purpose, we determined the morphological alterations that occur in the masseter muscle of guinea pigs (Cavia porcellus) after the induction of malocclusion by extraction of the left upper molars. Animals were divided into two groups (malocclusion and control group) and submitted to macroscopic, biometric and light microscopic analyses. The results showed a reduction in the width of the masseter muscle mainly in left side in the malocclusion group 60 days after unilateral extraction. Microscopically, round and polygonal muscle fibers of several diameters were observed, and altered muscle fibers with a central nucleus, degenerating fibers and macrophages were noted in more deeply fasciculi (AU)