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TMJ symptoms reduce chewing amplitude and velocity,and increase variability |
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| Authors: | John C. Radke Greg J. Kamyszek Robert S. Kull Gerardo R. Velasco |
| Affiliation: | 1. BioResearch Associates, Inc. , Milwaukee, WI, USA;2. Western NY TMD and OFP Clinic , W. Seneca, NY, USA;3. Medica Odontologica Craneo Mandibular A. C. , Guadalajara, Mexico |
| Abstract: | Objective: The null hypothesis was that mandibular amplitude, velocity, and variability during gum chewing are not altered in subjects with temporomandibular joint (TMJ) internal derangements (ID). Methods: Thirty symptomatic subjects with confirmed ID consented to chew gum on their left and right sides while being tracked by an incisor-point jaw tracker. A gender and age matched control group (p > 0.67) volunteered to be likewise recorded. Student’s t-test compared the ID group’s mean values to the control group. Results: The control group opened wider (p < 0.05) and chewed faster (p < 0.05) than the ID group. The mean cycle time of the ID group (0.929 s) was longer than the control group (0.751 s; p < 0.05) and more variable (p < 0.05). Discussion: The ID group exhibited reduced amplitude and velocity but increased variability during chewing. The null hypothesis was rejected. Further study of adaptation to ID by patients should be pursued. |
| Keywords: | Average chewing pattern turning point terminal chewing position temporomandibular joint internal derangement magnetic incisor-point jaw tracking |