This report presents the findings from a psychophysical study of vibrotactile responses in a patient diagnosed with temporomandibular disorder (TMD). This patient unexpectedly reported pain due to innocuous vibrotactile stimulation, and this allodynia appeared to have a component of temporal summation. The pain response occurred not only in the region of the clinical pain (the face), but also on the volar forearm, where the patient reported no clinical pain. Administration of the N-methyl-d-aspartate (NMDA) receptor antagonist dextromethorphan (DM), but not vehicle, attenuated the vibration-induced pain at both sites.
aDepartment of Psychology, University of Alabama at Birmingham, 1300 University Blvd, Birmingham, AL 35279-1170, USA
bDental Research Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
cDepartment of Psychology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
dDepartment of Endodontics, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
* Corresponding author. Tel.: +1 205 9343908; fax: +1 205 9756110; e-mail: Rfilling@uab.edu
Received January 13, 1998; accepted April 15, 1998.