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KMID : 0361919900200010169
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Korean Journal of Orthodontics
1990 Volume.20 No. 1 p.169 ~ p.176
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AN INITIAL HISTOLOGIC STUDY ON MOLAR INTRUSION OF CAT WITH THE USAGE OF PERMANENT MAGNET
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Abstract
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Utilizing the repelling force of permanent magnet of find out weather it shows the findings of molar intrusion histologically and compares the result with the resin bite plane. As for the experimental animals, 10 cats of completion of permanent dentition with mean weight of 2.2kg which have flat occlusal plane of molar areas were used.
I raised the cats under the condition of their being attached with manufactured appliance by direct bonding system and of their wearing vertical chin strap anesthetized for 12-14 hours per day ´ through 5 days. Then, observing the root apex areas with lightmicroscope.
The results were as follows:
1. In the group with resin_ bite plane, osteoclasts and osteoclasts could. not ´find out but could find out periodontal ligment fiber obliquely angulated in the apical and lingual direction.
2; In the group with the permanent magnet, not only the obliquely angulated periodontal ligament fiber but also the osteoclasts at the apical areas were observed.
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