The effect of cervical spine manual therapy on normal mouth opening in asymptomatic subjects.
OBJECTIVE
Temporomandibular disorders are a group of disorders affecting the temporomandibular joint and/or masticatory muscles. One of the signs associated with temporomandibular disorders is a reduction in mouth opening. During normal mouth opening, extension occurs at the cervical-cranial junction. The purpose of this investigation was to determine if manual therapy applied to the cervical-cranial junction would significantly improve mouth-opening capacity.


METHODS
One hundred one participants were randomly assigned to either an Active Release Technique (ART) group; high-velocity, low-amplitude manipulation (HVLA) group; or control group. A blinded investigator measured mouth opening using a TheraBite range of motion scale (TheraBite Corporation, West Chester, PA). Participants received ART to the suboccipitals or HVLA to the cervical spine at C1 or sat with an investigator for 3 minutes with no treatment. After the treatment session, mouth opening was remeasured. A repeated-measures analysis of variance was used to compare the group mean values. The a priori alpha level was .05.


RESULTS
The repeated-measures analysis of variance showed no significant difference between the ART, HVLA, and control groups' pretreatment and posttreatment measurements (F = 0.41, P > .05).


CONCLUSIONS
Manual therapy to the cervical spine did not significantly improve mouth opening in this asymptomatic population. Future trials using participants with restricted mouth-opening measures are warranted.
George
James W
JW
Research Resident, Division of Research, Logan College of Chiropractic, St Louis, MO 63006.
Fennema
Jason
J
Maddox
Adam
A
Nessler
Martha
M
Skaggs
Clayton D
CD
J Dent Res. 2002 Nov;81(11):747-51
12407088
Rev Stomatol Chir Maxillofac. 2005 Nov;106(5):267-71
16292219
Head Face Med. 2006 Aug 16;2:25
16914032
J Oral Rehabil. 2004 Feb;31(2):110-6
15009593
Phys Ther. 2006 May;86(5):710-25
16649894
J Dent Res. 2000 Jun;79(6):1378-84
10890716
J Oral Rehabil. 1999 May;26(5):428-35
10373091
J Orofac Pain. 2006 Winter;20(1):9-23
16483016
J Orthop Sports Phys Ther. 2000 Aug;30(8):484-92
10949505
Photomed Laser Surg. 2006 Feb;24(1):45-9
16503788
Tex Dent J. 2000 Jul;117(7):30-9
11858062
Clin Oral Investig. 1998 Jun;2(2):54-7
15490776
Br J Oral Maxillofac Surg. 1997 Feb;35(1):40-2
9043002
Cranio. 1987 Apr;5(2):130-8
3471354