[Histologic and SEM studies on aging changes of temporomandibular articular disc in young growing rats]

The normal aging changes of the temporomandibular articular discs in young growing SD rats were studied with histologic and scanning electron microscope methods. The results showed that the active remodeling growth was found in the discs of the rats from 3 to 9 weeks, which characterized as the changes from the young cellular connective tissues to fiberous cartilage gradually, these changes were consistent and adaptable with the growth of the condyle. The wave-like structures on the superior surface of discs of the rats from 5 to 8 weeks were varied morphologically in different bands and ages.