When the dental chair is in the supine position,the:

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When the dental chair is in the supine position,the patient is positioned as if lying down.
When the dental chair is in the upright position,the back of the chair is positioned at a vertical 90-degree angle.
When the dental chair is in the subsupine position,the patient's head is lower than the feet.
The upright position is the position used when radiographs are exposed and when impressions are taken.

When the Dental Chair Is in the Supine Position,the