Final answer:
The Waters projection is the radiographic view used to clearly demonstrate all four sets of paranasal sinuses, which include the maxillary, frontal, ethmoid, and sphenoid sinuses.
Step-by-step explanation:
The radiographic projection of the skull that should clearly demonstrate all four sets of paranasal sinuses is the Waters projection. This projection is particularly designed to visualize the maxillary sinuses, but when done correctly, it can reveal all the sinus spaces, including the frontal, ethmoid, and sphenoid sinuses. In addition to the Waters projection, a combination of radiographic views may be utilized to thoroughly evaluate the sinuses, such as the Caldwell view for the frontal and ethmoid sinuses, the lateral view for the sphenoid sinuses, and the submentovertex (SMV) view for the ethmoid and sphenoid sinuses.
The paranasal sinuses are hollow, air-filled spaces in the skull that serve several functions, including reducing the weight of the skull, humidifying and warming inhaled air, and increasing resonance of the voice. The maxillary sinuses are the largest, located below the orbits in the maxillary bones. The frontal sinuses are found in the frontal bone above the eyebrows, the ethmoid air cells are situated within the ethmoid bone, and the sphenoid sinuses are positioned within the body of the sphenoid bone.