title: Early dexamethasone relieves trigeminal neuropathic pain.
abstract: The analgesic effects of dexamethasone on neuropathic pain have been controversial. The present study investigated the effects of dexamethasone on mechanical allodynia in rats with mal-positioned dental implants. Under anesthesia, the left mandibular second molar was extracted and replaced by a miniature dental implant to injure the inferior alveolar nerve. Nociceptive behavior was examined on each designated day after surgery. Mal-positioned dental implants significantly decreased air-puff thresholds both ipsilateral and contralateral to the injury site. Distinct mechanical hyperalgesia and cold and thermal hypersensitivity were also observed bilaterally. Daily administration of dexamethasone produced prolonged anti-allodynic effects (25 or 50 mg/kg, i.p.), but failed to reduce mechanical allodynia when it had already been established. Therefore, our findings provide that early treatment with dexamethasone is important in the treatment of nociceptive behavior suggestive of trigeminal neuropathic pain.
authors.affiliation: Department of Oral Physiology, School of Dentistry, Kyungpook National University, 188-1 Sam Deok 2ga, Chung-gu, Daegu (700-412), Korea.
authors.forename: S R
authors.initials: SR
authors.lastname: Han
authors.forename: S P
authors.initials: SP
authors.lastname: Yeo
authors.forename: M K
authors.initials: MK
authors.lastname: Lee
authors.forename: Y C
authors.initials: YC
authors.lastname: Bae
authors.forename: D K
authors.initials: DK
authors.lastname: Ahn
mesh_terms: D000818:Animals; D015921:Dental Implants / Q000009:adverse effects; D003907:Dexamethasone / Q000627:therapeutic use*; D005157:Facial Pain / Q000188:drug therapy*; D005938:Glucocorticoids / Q000627:therapeutic use*; D008297:Male; D010812:Physical Stimulation; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D013997:Time Factors; D061221:Trigeminal Nerve Injuries; D014277:Trigeminal Neuralgia / Q000188:drug therapy*
chemical_list: D015921:Dental Implants; D005938:Glucocorticoids; D003907:Dexamethasone