What is the primary cause of ill-fitting dentures for patients with a large maxillary torus?

• A. Shape of the denture
• B. Inadequate impression technique
• C. Anatomical irregularity
• D. Improper occlusion

Answer: (C)

The primary cause of ill-fitting dentures for patients with a large maxillary torus is anatomical irregularity. The presence of a large maxillary torus creates a unique anatomical feature in the oral cavity, which can significantly affect how dentures fit. A torus is a bony growth that may protrude into the oral space, and if not properly accounted for during the denture construction process, it can lead to discomfort and challenges in achieving a proper fit.

When the anatomy of the mouth includes such irregularities, traditional denture fitting techniques might not provide the necessary adaptations needed for a comfortable and functional denture. Thus, the torus can interfere with the seating of the denture, leading to issues such as rocking or displacement during function.

In contrast, factors such as impression technique and denture shape certainly play a role in the overall fit but are secondary to the challenges posed by the underlying anatomical structure. Proper impression techniques should ideally capture these irregularities, and while the shape of the denture is critical, it must be adapted to accommodate the torus for an optimal outcome. Improper occlusion can affect the functionality of dentures, but it is not the primary factor causing fit issues in this specific situation.