Relationship between occlusion and EMG activity of the masseter muscles during clenching at maximal intercuspal position: a comparative study between prognathics and controls.

In the prognathic (P) patient group clenching at maximal intercuspal position (MIP), we found that the Ar-Go-Me angle is greater than in the control group (C = 120.9 degrees +/- 7 degrees vs. P = 134.

[Pseudoprognathism frequency and masseter muscle activity in operated cleft lip patients].

Background: As a consequence of a growth inhibition of middle third of the face, cleft lip surgery could lead to a pseudoprognathism. However, this is not always the case. Also, when facial architecture is changed, the activity of muscles such as the masseter could be disturbed.