Oral myofunctional therapy was found to be successful, In a group of 75 patients, ages six to 22 all with anterior open bites. Seventeen of 19 who lisped before therapy eliminated the lisp. Upper respiratory system allergies were eliminated In nine of 11 patients. A combination of myofunctional therapy and orthodontic treatment was more successful in correcting lip resting posture than was therapy alone. Lip and tongue resting postures, along with swallowing patterns, were corrected to a highly significant degree.
Daglio, S., et al. (1993). Treating orofacial dyskinesia with functional physiotherapy in the case of frontal open bite, International Journal of Orofacial Myology, 19 (1), 11-14.