What is the potential issue with using excessive thickness in buccal flanges for dentures?

The choice indicating denture instability is the correct response because excessive thickness in the buccal flanges can disrupt the balance and fit of the dentures within the oral cavity. When the flanges are too thick, they can create uneven pressure against the soft tissues of the cheeks and gums. This can lead to rocking or movement of the denture during function, such as eating or speaking, causing instability and discomfort.

Additionally, thick flanges may also interfere with the natural contour of the dental arch and the surrounding soft tissues, further contributing to instability as the denture may not adapt properly to the dynamic changes during activities like chewing. It's important for denture flanges to be appropriately contoured and of suitable thickness to ensure that they provide adequate support while maintaining the stability necessary for effective function and comfort.

While other options may also represent challenges associated with denture design, the specific concern of excessive thickness leading primarily to instability distinguishes it as the correct answer in this context.