In another study, Farsi supports this previous theory, that is to say that oral parafunctions have a significant role in TMD disorders. The results of his studies showed significant correlation between cheek gnawing, onychofagia, finger sucking and bruxism. On the other hand, posterior crossbite was considered a significant variable.
En otro estudioFarsi afirma lo antes mencionado, que las parafunciones orales tienen un papel significante en la etiología de TTM, sus resultados mostraron una significante correlación entre el hábito de mordisqueo del carrillo, onicofagia, succión digital y bruxismo.