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Digastric (Da) / Suprahyoid Muscles

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“The importance of the suprahyoids in cervical dysfunction is well known. Elevated digastric resting levels are frequently found in cases of marked lordosis. Complete postural evaluation must be made before constructing an orthosis to avoid continuous orthosis adjustment during correction of the cervical posture. If immediate treatment is required because of the mandibular malposturing and the patient’s symptoms, an interim orthosis can be pulsed using an acrylic material such as Sapphire.

Elevated digastric rest activity is frequent seen in patients with lateral or anterior tongue posture. The open bite occlusion is the result of tongue habits either compensating for an unstable occlusion or attempting to maintain a respiratory airway. Lateral open bites with elevated digastric activity usually require an orthosis to restore occlusal stability and to keep the tongue from between the teeth. Anterior open bites with elevated digastric activity often results from anatomic nasal obstruction or allergic nasal obstruction. Therefore, immediate medical evaluation for nasal airway obstruction should be obtained. Surgical treatment to establish nasal clearance or allergy management to minimize the need for mouth breathing should occur before definitive occlusal correction.” Jankelson writes: “Realistically, EMG data derived from the digastric muscle represents a composite of activity of the platysma, mylohyoid and neighboring suprahyoid muscles. The long , thin nature of the muscle and its relatively deep position preclude surface monitoring or purely digastric EMG signals.”

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