Involvement of transient receptor potential vanilloid 1 in ectopic pain following inferior alveolar nerve transection in rats

► The inferior alveolar nerve (IAN) transection was performed. ► Nocifensive behavior induced by whisker capsaicin injection was increased. ► TRPV1 positive neurons that supply whisker pad skin in trigeminal ganglion increased. ► TRPV1 was involved in the ectopic pain of whisker pad skin after IAN transection.