Which positioning type is not mentioned for taking dental radiographs?

The positioning type that is not typically mentioned for taking dental radiographs is prone.

In dental radiography, specific positioning is crucial for obtaining accurate images while ensuring the comfort and safety of the patient. The common positions used during dental radiography include sternal, lateral, and dorsal positions. The sternal position involves the patient lying on their stomach or back, which allows for certain radiographic views. Lateral positioning is often utilized to capture side views, especially in specific dental imaging, while dorsal positioning refers to the patient lying on their back.

In contrast, the prone position, where the patient lies flat on their stomach, is not standard for dental radiographs. This is primarily because dental procedures require access to the mouth from the front; thus, a prone position would complicate the process and hinder the imaging required for effective dental assessments. Therefore, it is the position that is least relevant in the context of dental radiography.