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ULTRASTRUCTURAL STUDY ON THE EFFECTS OF RETROGRADE INFUSION OF WATER-SOLUBLE CONTRAST MEDIA ON THE RABBIT SUBMANDIBULAR GLAND

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Abstract

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#ÃÊ·Ï#
The author observed the effects of retrograde infusion of water soluble contrast media
(Tele-brix 30) on the rabbit submandibular glands and compared the effects of different
degrees of filling. 26 rabbits were divided into 2 groups of 12 each as experimentals and
1 group of 2 as normal controls. One experimental group was filled with 0.2 §¢ and the
other with 0.4 §¢. Right submandibular gland of each rabbit was infused with contrast
media and left one with physiologic saline as a experimental control, at a constant rate
of 0.12 §¢/min, using an infusion pump via the main excretory duct. Immediately after
the infusion of contrast media, oblique lateral radiographs of the glands were made with
occlusal film in order to confirm the glandular filling. The rabbits were sacrificed after
varying periods (1, 8, 24 hours and 3, 6, 10 days) and the tissues were prepared for
light and electron microscopic examination.
The results were as follows:
1. In glands filled with 0.2 §¢ contrast media, the initial changes were a few vacuole
formation in the acini and slight dilation of the intralobular duct. The moderately severe
changes such as vacuole formation in the acini, the abnormal substructure within the
secretory granule, dilation of acinar and intercalated duct lumen, scalloping of striated
duct lumen and inflammatory cell infiltrate were observed at 3 days. The general
appearance was successively recovered, so the tissue had a normal appearance at 10
days.
2. In glands filled with 0.4 §¢ contrast media, the most prominent alterations such as
severe acinar atrophy, decreased number of secretory granules, proliferation of connective
tissue stroma and pronounced inflammatory cell infiltrates appeared at 6 days. Although
the general appearance returned to be almost normal at 10 days, acinar cells showed
some atrophy and decrease d secretory granules.
3. In glands subjected to 0.4 §¢ infusion, the alterations were more severe and the
recovery was slower than those seen in the glands to 0.2 §¢ infusion.

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