The vestibular portion of Frankel appliances provides expansion of the dental arches due to the removal of what pressure?

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Multiple Choice

The vestibular portion of Frankel appliances provides expansion of the dental arches due to the removal of what pressure?

Explanation:
The vestibular portion works by relieving the constrictive muscular forces from the lips and cheeks that restrain the dentition. When this pressure is removed, the arches can widen under the influence of the tongue and neutral facial muscles, producing expansion of the dental arches. In short, the expansion results from releasing the constrictive perioral pressure, not from an active pushing force. This is why rotation or tipping aren’t the primary actions of this part of the appliance.

The vestibular portion works by relieving the constrictive muscular forces from the lips and cheeks that restrain the dentition. When this pressure is removed, the arches can widen under the influence of the tongue and neutral facial muscles, producing expansion of the dental arches. In short, the expansion results from releasing the constrictive perioral pressure, not from an active pushing force. This is why rotation or tipping aren’t the primary actions of this part of the appliance.

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