TITLE:
Unilateral Impact of Altered Loading by Changing Teeth Height on the TMJ Fibrocartilage: Disc and Condyle of Wistar Rats
AUTHORS:
Roxanne M. Olvera-Farias, Jose Raymundo Cruz-Perez, Rogelio Salinas-Gutierrez, Jose Antonio Guerrero-Diaz de Leon, Juan B. Kouri-Flores, Raul Rosales-Ibañez, David Masuoka Ito, Alma Lilian Guerrero Barrera
KEYWORDS:
Articular Disc, Articular Cartilage, Dental Occlusion, Collagen, Temporomandibular Joint
JOURNAL NAME:
Microscopy Research,
Vol.4 No.2,
April
14,
2016
ABSTRACT: Temporomandibular joint (TMJ) is sensitive to loading and mechanical stress that provokes morphological changes produced by the impact in the occlusal plane. Here, this impact is evaluated in TMJ articular disc and articular cartilage using an in vivo model of unilateral occlusal plane impact and by analysis of serial tissue sections stained with Hematoxylin-Eosin (H-E) or with Masson trichrome technique. Thus, six groups of 5 Wistar rats (200 - 250 g) are subjected to biomechanical dental stimulation by placing unilateral resin occlusal interference, or unilateral tooth wear made by upper left molars artificial mechanical devastation (1 control and 2 experimental groups for each treatment). Each treatment is evaluated two times at 1 and 15 days post-treatment. By H-E staining, control groups show chondrocytes arrangement as several cord cell groups in comparison with the experimental groups, which show an arrangement in one cord cell along of articular disc. However, this yields no significant difference (p