What is the most common functional factor in the etiology of vertical inocclusion?

What is the most common functional factor in the etiology of vertical inocclusion?

• A. Infant-type swallowing
• B. Physiological swallowing
• C. Nasal breathing
• D. Mixed breathing

Answer: (A)

The influence of swallowing habits on the vertical dimension of the dentition is the key idea. Infant-type swallowing involves a forward tongue thrust where the tongue presses against the anterior teeth and the palate during swallowing, with incomplete lip seal. This creates a persistent vertical component of force on the front teeth. If this pattern is habitual, it can alter tooth eruption and tipping in a way that changes the vertical relationship of the arches, contributing to a vertical occlusion problem such as a deep bite. This makes it the most commonly implicated functional factor in vertical occlusion. Physiological swallowing corresponds to the normal pattern and nasal or mixed breathing can affect facial growth more generally, but they are not as directly tied to the vertical occlusion pattern as an abnormal, habitual tongue-thrust swallow is.

The influence of swallowing habits on the vertical dimension of the dentition is the key idea. Infant-type swallowing involves a forward tongue thrust where the tongue presses against the anterior teeth and the palate during swallowing, with incomplete lip seal. This creates a persistent vertical component of force on the front teeth. If this pattern is habitual, it can alter tooth eruption and tipping in a way that changes the vertical relationship of the arches, contributing to a vertical occlusion problem such as a deep bite. This makes it the most commonly implicated functional factor in vertical occlusion. Physiological swallowing corresponds to the normal pattern and nasal or mixed breathing can affect facial growth more generally, but they are not as directly tied to the vertical occlusion pattern as an abnormal, habitual tongue-thrust swallow is.