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KMID : 0376319920040010147
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Dental Journal of CNU
1992 Volume.4 No. 1 p.147 ~ p.161
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Innervation of rat molaps and periodontium: an immunohistochmical investigation of neurofilament protein and glia-specific s-100 protien
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Abstract
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Nervous elements in the rat molars and periodontium were investigated by means of immunohistochemistry for neurofilament protein (NFP) and glia-specific S-100 protein
NFP-positive nerve fibers formed a subodontoblastic plexus in the coronal pulp; some of them entered the predentin and dentin directly through the dentinal tubules. These penetration of nerve fibers were found densely in the pulp horn and limited
to a
distance of about 50㎛ from the pulpo-dentinal junction. In the periodontal ligament, NFP-positive fibers were found in the apical half of the alveolar socket. Free nerve endings and Ruffini endings were recongnized in the periodontal ligament.
The
formed tapered among the periodontal fibers, some even reaching the cementoblastic layer. The latter were located within the ligament and restricted to the apical third of the teeth without terminal dilations. A well developed plexus of
NFP-positive
nerves were revealed in the Iamina propria of the free gingiva, the innervation being denser toward the sulcular epithelium of the gingiva.
Immunostaining for the S-100 protein revealed a distribution pattern of nervous elements similar to that of NFP, suggesting that the nerves supplying molars and periodontium were mostly covered by a Schwann sheath.
These findings suggest that NFP and S-100 protein immunoreactive nerves are distributed in the rat molars and periodonium and immunohistochemistry for NFP and S-100 protein can be used as useful technique in the evaluation of the innervation of
teeth
and periodontium.
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KEYWORD
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