Neuropathic Facial Pain Diagnosis and Management

Differential Diagnosis

The combination of unilateral continuous pain with numbness lasting 3 months after normal dental examination points strongly toward a neuropathic etiology rather than musculoskeletal or dental pathology, according to the British Journal of Anaesthesia 1
Post-traumatic trigeminal neuropathic pain/Atypical odontalgia is the primary consideration given continuous pain in the trigeminal distribution, associated numbness, pain triggered by eating, drinking, and talking, and normal dental examination excluding odontogenic causes 2, 3
Temporomandibular disorder (TMD) typically presents without numbness, but is still a possible diagnosis, with a prevalence of 5-12% of the population, peaking at age 20-40 1, 4, 5

MRI of the brain and trigeminal nerve is mandatory to exclude structural lesions, tumors, or nerve compression, and to identify nerve injury or pathology 2, 3
Comprehensive cranial nerve examination must document specific areas of altered sensation, light touch sensitivity testing in all three trigeminal divisions, and assessment for other neurologic deficits outside the trigeminal nerve 2, 3
Qualitative sensory testing (QST) should be performed to quantify sensory abnormalities and differentiate peripheral versus central neuropathic mechanisms 2

Gabapentin is the recommended first-line agent for trigeminal neuropathic pain, with a typical starting dose of 300mg at bedtime, titrating up to 900-3600mg daily in divided doses, and has been shown to reduce burning sensation in 50% of patients 8
Alternative or adjunctive medications, such as amitriptyline, topical lidocaine, and alpha lipoic acid, may be used if gabapentin fails or is poorly tolerated 2, 5, 8
Cognitive behavioral therapy (CBT) should be initiated early to address psychological components that exacerbate symptoms, improve coping strategies, and quality of life 2, 5, 8