I have to say that it seems that on a weekly basis, I have a conversation with another parent about their child who has a “tongue thrust”!
Re: the child that I evaluated…..After carefully looking into his errors, I realized that this 10 year old had a combination of an interdental lisp and an upper dentalized lisp, that I was initially perceiving as a lateral lisp bc there was some lateral airflow based on his broad tongue configuration. Does that make sense to you???? I am questioning this for some reason!
I think the bottom line is that most kids with any type of lisp started out interdentally. Through the years of correction by parents or therapists or self-correction, they each develop a unique way to try to “cover” the original lisp, ending up with a variety of “lisp types” and the possible way that air is released during production, the preferred tongue positions taken, etc. are merely a matter of what worked most easily or what they were taught to do to artificially “hide” a lisp.
Thus, we come back to the necessity of maximizing their lingual control and excursions/shaping; You can’t work on tongue position until prof exam #1 is mastered; then you address the position of the tongue, lips and mandible; and only thereafter should artic be undertaken since it is then a “fair” request to place tongue where it should be, etc.
I hope this helps…