Abstract:The present study was conducted to clarify the histological changes in the a cinar and myoepithelial cells of the rat submandibular gland after ligation of the main excretory duct for one week, and also the regenerative movements of these cells after ligation release . Tissue specimens were subjected to immunostaining and TUNEL staining , and examined by light microscopy. Some of the samples were prepared for transmission electron microscopy by a routine method . Duct-like structures covered with myoepithelial cells were not detected in normal rats, but were frequently observed after ligation of th e main excretory duct. A few TUNEL-positive acinar cells, apparently apoptotic , were observed by light microscopy , but could not be identified by electron microscopy. Therefore , we consider that only a limited number of cells underwent apoptosis, if any. Almost normal acinar cells were detected throughout th e entire submandibular gland 4 weeks after the loosening of the ligature. These findings suggest that duct -like structures may become acini, resulting in recovery.

This paper reports the four cases of the condylar head fractures of the mandible. The diagnostic images with panoramic radiograph and CT are presented. From 4 cases of condylar head fractures, the incidence, causes, and mechanisms are also discussed together with previous report.

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