Final answer:
The maxillary sinus, located within the maxillary bones below the orbits, can be perforated by the roots of some upper maxillary teeth. It's the largest of the paranasal sinuses and plays a role in lightening the skull and vocal resonance.
Step-by-step explanation:
The sinus cavity that can be perforated by the roots of some maxillary teeth is the maxillary sinus. This sinus is one of the paranasal sinuses, specifically located within the maxillary bones below the orbits. The roots of the upper teeth can sometimes protrude into this sinus, and due to their close proximity, any dental infection or procedure on these teeth has the potential to affect the maxillary sinus. Additionally, the maxillary sinuses are the largest of the paranasal sinuses and are important for functions such as reducing bone mass, lightening the weight of the skull, and adding resonance to the voice. During sinus infections, they are the most commonly affected due to their location and the high position of their connection to the nasal cavity.