Volume 219, Issue 1 pp. 32-38
Connective Tissue Biology
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Effect of surgical sympathectomy on bone remodeling at rat incisor and molar root sockets

H. S. Sandhu

H. S. Sandhu

Division of Oral Biology, Faculty of Dentistry, The University of Western Ontario, London, Canada N6A 5C1

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M. S. Herskovits

M. S. Herskovits

Department of Anatomy, New York College of Osteopathic Medicine, Old Westbury, NY 11568

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I. J. Singh

I. J. Singh

Department of Anatomy, New York University Dental Center, New York, NY 10010

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First published: September 1987
Citations: 78

Abstract

Sympathectomy was carried out in 4-week-old Sprague-Dawley rats by unilateral surgical removal of the superior cervical ganglion. Sham-treated rats served as controls. All rats were injected with tetracycline hydrochloride at surgery as well as 36 hr prior to sacrifice. Rats were killed at 7, 14, or 21 days following sympathectomy. Mandibular periosteal and endosteal surfaces were analyzed by fluorochrome morphometry. Osteoclasts were identified by acid phosphatase staining, and incisor and molar root sockets were analyzed morphometrically. Following sympathectomy, periosteal and endosteal apposition as well as the rate of mineralization were significantly lower. At the same time, a significant increase in the number of osteoclasts per socket as well as in active and inactive bone resorption surfaces was also seen. All parameters, however, returned to normal values 2–3 weeks after sympathectomy. The data provide the first direct quantitative evidence that sympathetic neurons modulate bone resorption and bone remodeling in vivo.

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