Immunohistochemical Analysis of Maxillary Nerve Distribution in Rats

Area of Science:

• Neuroscience
• Anatomy
• Oral Biology

Background:

• Previous orofacial nerve studies focused on anatomy, not density.
• Mandibular nerve density increases towards the inferior alveolar nerve.
• Maxillary nerve distribution density remains largely unstudied.

Purpose of the Study:

• To quantify nerve distribution density in the maxilla.
• To compare maxillary nerve density to mandibular nerve density.
• To determine the ratio of nociceptive nerves in the maxilla.

Main Methods:

• Immunohistochemical staining of Wistar rat maxillary molar tissue using PGP and CGRP antibodies.
• Microscopic analysis of nerve distribution density in five distinct maxillary regions.
• Quantification of vertical and horizontal nerve distribution and nociceptive nerve ratios.

Main Results:

• Maxillary nerve density (PGP-positive) and nociceptive nerve density (CGRP-positive) increased vertically and horizontally.
• The ratio of CGRP-positive to PGP-positive nerves exceeded 80%.
• Maxillary nerve density was approximately one-third of previously reported mandibular nerve density.

Conclusions:

• Maxillary nerve distribution patterns mirror mandibular patterns but with lower overall density.
• Findings provide crucial data on maxillary nerve distribution density.
• This research supports future studies on orofacial pain and local anesthesia efficacy.