TY - JOUR
T1 - Bilateral supra- and infrahyoid EMG activity duringeccentric jaw clenching and tooth grinding tasks in subjects with canine guidance or group function
AU - Valenzuela, Saú
AU - Portus, Constanza
AU - Miralles, Rodolfo
AU - Campillo, María José
AU - Santander, Hugo
AU - Fresno, María Javiera
AU - Gutiérrez, Mario Felipe
PY - 2012
Y1 - 2012
N2 - This study compares the effect of tooth clenching and grinding on supra- and infrahyoidelectromyographic (EMG) activity during different laterotrusive jaw posture tasks. The study included 30 healthy subjects with natural dentition and bilateral molar support, 15 with bilateral canine guidance and 15 with bilateral group function. Bipolar surface electrodes were located on the left and right supra- andinfrahyoid muscles. EMG activity was recorded during the following tasks: A. eccentric grinding from intercuspal position to the right lateral edge-to-edge contact position; B. clenching in right edge-to-edge lateral contact position; C. concentric grinding from right lateral edge-to-edge contact position to intercuspal position. EMG activity was not significantly different between tasks on the working side, nonworking side, or between both sides, in subjects with canine guidance or group function (Wilcoxon rank-sum test). When comparing EMG activity by occlusal scheme,no significant differences were found either on the working side or the non-working side (Mann-Whitney U test). This result suggests that supra- and infrahyoid EMG activity in its predominant stabilizing role of the hyoid bone is not significantlymodified by the type of laterotrusive occlusal scheme.
AB - This study compares the effect of tooth clenching and grinding on supra- and infrahyoidelectromyographic (EMG) activity during different laterotrusive jaw posture tasks. The study included 30 healthy subjects with natural dentition and bilateral molar support, 15 with bilateral canine guidance and 15 with bilateral group function. Bipolar surface electrodes were located on the left and right supra- andinfrahyoid muscles. EMG activity was recorded during the following tasks: A. eccentric grinding from intercuspal position to the right lateral edge-to-edge contact position; B. clenching in right edge-to-edge lateral contact position; C. concentric grinding from right lateral edge-to-edge contact position to intercuspal position. EMG activity was not significantly different between tasks on the working side, nonworking side, or between both sides, in subjects with canine guidance or group function (Wilcoxon rank-sum test). When comparing EMG activity by occlusal scheme,no significant differences were found either on the working side or the non-working side (Mann-Whitney U test). This result suggests that supra- and infrahyoid EMG activity in its predominant stabilizing role of the hyoid bone is not significantlymodified by the type of laterotrusive occlusal scheme.
UR - http://www.scopus.com/inward/record.url?scp=84866461139&partnerID=8YFLogxK
U2 - 10.1179/crn.2012.032
DO - 10.1179/crn.2012.032
M3 - Article
C2 - 22916674
AN - SCOPUS:84866461139
VL - 30
SP - 209
EP - 217
JO - Cranio - Journal of Craniomandibular Practice
JF - Cranio - Journal of Craniomandibular Practice
SN - 0886-9634
IS - 3
ER -