What is the consequence of over-extension of the denture base flange?

When considering the consequences of an over-extension of the denture base flange, the most accurate outcome is discomfort in the oral cavity. Over-extended flanges can lead to irritation of the oral mucosa due to excessive pressure and contact with surrounding tissues. This can manifest through soreness, redness, and inflammation in the areas affected, which can significantly impact a patient's comfort while wearing the dentures.

While it is true that the masseter muscle plays a role in the movement of the jaw and can engage during chewing, an over-extended flange does not typically result in "uprighting" of the denture. This term implies a structural or positional correction of the denture itself due to muscle action, which is not a common reaction to over-extension. More commonly, over-extension leads to ineffective seating of the denture, leading to additional complications such as difficulty in maintaining hygiene and function, which predominantly result in discomfort rather than a beneficial upright adjustment. Therefore, discomfort is indeed a primary consequence of over-extended denture flanges.