With OMD, the tongue moves forward in an exaggerated way during speech and/or swallowing. The tongue may lie too far forward during rest or may protrude between the upper and lower teeth during speech and swallowing, and at rest.
Although a “tongue thrust” swallow is normal in infancy, it usually decreases and disappears as a child grows. If the tongue thrust continues, a child may look, speak, and swallow differently than other children of the same age. Older children may become self-conscious about their appearance.
Some children produce sounds incorrectly as a result of OMD. OMD most often causes sounds like /s/,/z/, “sh”, “zh”, “ch” and “j” to sound differently. For example, the child may say “thumb” instead of “some” if they produce an /s/ like a “th”. Also, the sounds /t/, /d/, /n/, and /l/ may be produced incorrectly because of weak tongue tip muscles. Sometimes speech may not be affected at all.
OMD is often diagnosed by a team of professionals. In addition to the child and his or her family or caregivers, the team may include:
- a dentist
- an orthodontist
- a physician
- a speech-language pathologist (SLP)
Both dentists and orthodontists may be involved when constant, continued tongue pressure against the teeth interferes with normal tooth eruption and alignment of the teeth and jaws. Physicians rule out the presence of a blocked airway (e.g., from enlarged tonsils or adenoids or from allergies) that may cause forward tongue posture. SLPs assess and treat the effects of OMD on speech, rest postures, and swallowing.
A speech-language pathologist (SLP) with experience and training in the treatment of OMD will evaluate and treat the following:
SLPs develop a treatment plan to help a child change his or her oral posture and articulation, when indicated. If tongue movement during swallowing is a problem, the SLP will address this as well.
Treatment techniques to help both speech and swallowing problems caused by OMD may include the following:
- increasing awareness of mouth and facial muscles
- increasing awareness of mouth and tongue postures
- improving muscle strength and coordination
- improving speech sound productions
- improving swallowing patterns
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