Itotagawa T, Yamanaka H, Wakisaka S, Sasaki Y, Kato J, Kurisu K, Tsuchitani Y
Department of Operative Dentistry, Osaka University Faculty of Dentistry, Japan.
Arch Oral Biol. 1993 Aug;38(8):725-8. doi: 10.1016/0003-9969(93)90013-c.
The effects of these injuries on the presence and distribution of neuropeptide Y (NPY)-immunoreactive (-IR) neurones were examined immunohistochemically. In the normal trigeminal ganglion: some perivascular nerves displayed NPY-IR but there were no NPY-IR ganglionic cells. Fourteen days after extraction or pulp exposure of the upper first molar, NPY-IR cells appeared in the maxillary region of the trigeminal ganglion. About 90% of the injury-evoked NPY-IR cells had medium to large diameters (more than 300 microns2 in cross-sectional area). Shallow cavity preparation, however, did not induce the appearance of NPY-IR cells in the trigeminal ganglion. These results indicate the dental injuries alter the primary sensory neurones in the trigeminal ganglion.
