Abstract
This study was designed to determine if sympathetic nerve fibers exist in dentinal tubules in rat normal dental pulp, and if they sprout into the tubules in the inflamed condition. Sympathetic nerve fibers in rat molar dental pulp were labeled using an anterograde axonal transport technique involving injection of wheat germ agglutinin-horseradish peroxidase (WGA-HRP) into the superior cervical ganglion. In the normal dental pulp, scattered WGA-HRP reaction products were observed in unmyelinated nerve endings in odontoblast layer and subodontoblastic region, mostly close to odontoblast cell bodies. More reaction products were detected in the above areas in the inflamed dental pulp than that in the normal pulp. However, no labeled nerve fibers were observed in dentinal tubules in either normal or inflamed dental pulp. These results indicate that although sympathetic nerve fibers do indeed sprout in inflamed dental pulp, they do not penetrate into the dentinal tubules.
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