IADR Abstract Archives
Forced lip closure. A preliminary electromyographic evaluation
Objectives: To compare the electromyographic (EMG) activity of buccinator (BUC), mentalis (MN) and suprahyoid (SH) muscles in participants with forced lip closure (FLC), with lip competence (LC) and with lip incompetence (LI).
Methods: This study included 18 healthy participants (range between 18 and 26 years). They were classified in clinical rest position according to their lip closure and clinical perioral activity in three groups (6 participants per group): FLC group: lips in contact with higher clinical activity of the MN muscle, verified by shrinkage of the chin skin; LC group: lips in light contact without clinical activity of the MN muscle; LI group: lips apart without clinical activity of the MN muscle. Surface electrodes were placed on the BUC, MN and SH muscles, on the chewing-side preference. A large surface ground electrode was attached to the forehead. Three EMG recordings were done seated upright, looking straight ahead and with his/her head in the postural position, during the following tasks: 1) normal quiet breathing; 2) speaking the word “Mississippi”; 3) swallowing of saliva; 4) maximal lips tightening; 5) chewing of gummy candy. The mean value of the three curves obtained for each task and for each participant in each group was used for the statistical comparison. The data were analyzed using a Kruskal-Wallis test. The level of significance was set at P < 0.05. The data were analyzed using SPSS software (IBM SPSS Statistic ® v 21).
Results: PRELIMINAR RESULT: EMG activity of BUC, MN and SH muscles did not show significant differences between groups at any of the tasks studied.
Conclusions: From electromyographic point of view, the studied groups present a similar muscular pattern of activity. It is necessary complete the sample to obtain the final result.
Methods: This study included 18 healthy participants (range between 18 and 26 years). They were classified in clinical rest position according to their lip closure and clinical perioral activity in three groups (6 participants per group): FLC group: lips in contact with higher clinical activity of the MN muscle, verified by shrinkage of the chin skin; LC group: lips in light contact without clinical activity of the MN muscle; LI group: lips apart without clinical activity of the MN muscle. Surface electrodes were placed on the BUC, MN and SH muscles, on the chewing-side preference. A large surface ground electrode was attached to the forehead. Three EMG recordings were done seated upright, looking straight ahead and with his/her head in the postural position, during the following tasks: 1) normal quiet breathing; 2) speaking the word “Mississippi”; 3) swallowing of saliva; 4) maximal lips tightening; 5) chewing of gummy candy. The mean value of the three curves obtained for each task and for each participant in each group was used for the statistical comparison. The data were analyzed using a Kruskal-Wallis test. The level of significance was set at P < 0.05. The data were analyzed using SPSS software (IBM SPSS Statistic ® v 21).
Results: PRELIMINAR RESULT: EMG activity of BUC, MN and SH muscles did not show significant differences between groups at any of the tasks studied.
Conclusions: From electromyographic point of view, the studied groups present a similar muscular pattern of activity. It is necessary complete the sample to obtain the final result.