Loosening of a maxillary complete denture during yawning is usually due to interference with which area?

The correct answer relates to the role of the coronoid process in denture stability. The coronoid process is a bony projection on the mandible and is involved in the movement of the jaw during yawning and other functions. When a patient yawns, the jaw opens widely, and this motion can cause the coronoid processes to move laterally. If a maxillary complete denture is not designed properly to accommodate this movement, it can result in the loosening of the denture.

A well-fitted denture should have enough room to avoid any interference with the coronoid process; otherwise, this anatomical feature can push against the denture base, leading to displacement. Ensuring that the denture allows for the natural movements of the mandible, including those caused by the coronoid process during yawning, is crucial for the retention and stability of the complete denture.

The other areas mentioned (hamus notch, vibrating line, masseter muscle) do not primarily relate to the loosening of a maxillary complete denture during yawning. The hamus notch is more relevant to the posterior aspect of the maxilla and influences denture retention but in different contexts. The vibrating line is important for establishing the