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However, peripheral mechanisms underlying orofacial pain abnormalities following <jats:styled-content style=\"fixed-case\">IAN<\/jats:styled-content> regeneration are not fully understood.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Head withdrawal threshold (<jats:styled-content style=\"fixed-case\">HWT<\/jats:styled-content>), jaw opening reflex (<jats:styled-content style=\"fixed-case\">JOR<\/jats:styled-content>) thresholds, single\u2010fibre recordings of the regenerated mental nerve (<jats:styled-content style=\"fixed-case\">MN<\/jats:styled-content>) fibres, calcitonin gene\u2010related peptide (<jats:styled-content style=\"fixed-case\">CGRP<\/jats:styled-content>), isolectin <jats:styled-content style=\"fixed-case\">B<\/jats:styled-content>4 (<jats:styled-content style=\"fixed-case\">IB<\/jats:styled-content>4), peripherin, neurofilament\u2010200 (<jats:styled-content style=\"fixed-case\">NF<\/jats:styled-content>\u2010200) and transient receptor potential vanilloid 1 (<jats:styled-content style=\"fixed-case\">TRPV<\/jats:styled-content>1) expression in trigeminal ganglion (<jats:styled-content style=\"fixed-case\">TG<\/jats:styled-content>) cells, and electron microscopic (<jats:styled-content style=\"fixed-case\">EM<\/jats:styled-content>) observations of the regenerated <jats:styled-content style=\"fixed-case\">MN<\/jats:styled-content> fibres were studied in MN\u2010 and <jats:styled-content style=\"fixed-case\">IAN<\/jats:styled-content>\u2010transected (<jats:styled-content style=\"fixed-case\">M<\/jats:styled-content>\u2010<jats:styled-content style=\"fixed-case\">IANX<\/jats:styled-content>) rats.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p><jats:styled-content style=\"fixed-case\">HWT<\/jats:styled-content> to mechanical or heat stimulation of the mental skin was significantly lower in <jats:styled-content style=\"fixed-case\">M<\/jats:styled-content>\u2010<jats:styled-content style=\"fixed-case\">IANX<\/jats:styled-content> rats compared with sham rats. Mean conduction velocity of action potentials recorded from <jats:styled-content style=\"fixed-case\">MN<\/jats:styled-content> fibres (<jats:italic>n<\/jats:italic>\u2009=\u2009124) was significantly slower in <jats:styled-content style=\"fixed-case\">M<\/jats:styled-content>\u2010<jats:styled-content style=\"fixed-case\">IANX<\/jats:styled-content> rats compared with sham rats. The percentage of Fluoro\u2010Gold (<jats:styled-content style=\"fixed-case\">FG<\/jats:styled-content>)\u2010labelled <jats:styled-content style=\"fixed-case\">CGRP<\/jats:styled-content>\u2010, peripherin\u2010 or <jats:styled-content style=\"fixed-case\">TRPV<\/jats:styled-content>1\u2010immunoreactive (<jats:styled-content style=\"fixed-case\">IR<\/jats:styled-content>) cells was significantly larger in <jats:styled-content style=\"fixed-case\">M<\/jats:styled-content>\u2010<jats:styled-content style=\"fixed-case\">IANX<\/jats:styled-content> rats compared with that of sham rats, whereas that of <jats:styled-content style=\"fixed-case\">FG<\/jats:styled-content>\u2010labelled IB4\u2010 and <jats:styled-content style=\"fixed-case\">NF<\/jats:styled-content>\u2010200\u2010<jats:styled-content style=\"fixed-case\">IR<\/jats:styled-content> cells was significantly smaller in <jats:styled-content style=\"fixed-case\">M<\/jats:styled-content>\u2010<jats:styled-content style=\"fixed-case\">IANX<\/jats:styled-content> rats compared with sham rats. Large\u2010sized myelinated nerve fibres were rarely observed in <jats:styled-content style=\"fixed-case\">M<\/jats:styled-content>\u2010<jats:styled-content style=\"fixed-case\">IANX<\/jats:styled-content> rats, whereas large\u2010sized unmyelinated nerve fibres were frequently observed and were aggregated in the bundles at the distal portion of regenerated axons.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>These findings suggest that the demyelination of <jats:styled-content style=\"fixed-case\">MN<\/jats:styled-content> fibres following regeneration may be involved in peripheral sensitization, resulting in the orofacial neuropathic pain associated with trigeminal nerve injury.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ejp.650","type":"journal-article","created":{"date-parts":[[2014,12,19]],"date-time":"2014-12-19T11:28:45Z","timestamp":1418988525000},"page":"1258-1266","source":"Crossref","is-referenced-by-count":12,"title":["Morphological and functional 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