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The minimum distance required between anterior-posterior palatal straps in a removable partial denture is based on providing adequate support and stability to the denture while also ensuring comfort for the patient. A distance of 15 mm allows for effective distribution of forces during function, helping to prevent movement of the partial denture that could cause discomfort or affect its performance. This measurement also considers the anatomical features of the palate, ensuring that the straps do not interfere with the patient's normal oral functions, such as speech and swallowing.

Opting for a distance shorter than 15 mm could lead to increased chances of denture dislodgement and discomfort for the wearer, while longer distances, while they may provide more support, could unnecessarily complicate the design and aesthetics of the denture. Thus, the correct choice of 15 mm balances these factors effectively.