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Volume 16 , Issue 3
May/June 1996

Pages 279-289


Cyclosporin A-induced gingival overgrowth in rats: Macroscopic and microscopic observations

Fu/Nieh/Chang/Wang


PMID: 9084313
DOI: 10.11607/prd.00.0170

Because the existence of cylosportin A-induced gingival overgrowth in animals has not been well established, a pilot study was undertaken to determine whether such gingival overgrowth could be observed in Sprague-Dawley rats. Thirty-six male rats, age 6 weeks, were randomly divided into two groups. The test group was given 30 mg/kg of body weight of cyclosporin A daily by gastric feeding. The control group was given mineral oil instead. Stone casts of the gingiva in the mandibular incisor region were made biweekly for 6 weeks. The three-dimensional growth pattern--the buccolingual width, the mesiodistal width, and the vertical height of the gingiva--was analyzed on the casts. The animals were killed after the last impression was taken, and tissue sections were made. Stereomicroscopy revealed marked overgrowth of the gingiva in the test rats. All three-dimensional measurements on the stone casts were greater in the test group, beginning 2 weeks after cyclosporin A was given. Histologically the overgrowth of the epithelia and connective tissue was easily confirmed in the buccal and lingual gingiva of the test rats.


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