PURPOSE: to compare Suprahyoid musculature's electric activity during swallowing in subjects with dissimilar morphological and dental patterns. METHODS: surface Electromyography's records were taken from 32 healthy volunteers who do not have Temporomandibular Dysfunction, subdivided into two groups, Angle's 16 Class I subjects and 16 Class III subjects, males and females, aging from 18 to 25-year old. RESULTS: the values to Root Mens Square (p< 0.05): original Class I (15.238) e Class III (32.550); normalized by maximum peak Class I (29.765) e Class III (42.094); normalized by medium Class I (29.332) e Class III (42.327). Cycle's active period (p<0.05) Class I (29.7648) e Class III (42.0937); maximum activity instance (p>0.05) Class I (47.6485) e Class III (47.9437). CONCLUSION: class I subjects showed a smaller average amplitude, with increase and decrease of synchronized and balanced electric activity. Class III subjects showed a larger average amplitude and a larger desynchronized and unbalanced period during deglutition.
Deglutition; Malocclusion, Angle Class III; Electromyography
