What indicates a lack of appropriate border contours for an RPD?

Choosing an option indicating visible gaps along the edges of the base signifies a lack of appropriate border contours for a removable partial denture (RPD). When there are gaps present, it suggests that the denture base does not have the proper adaptation to the underlying tissues. Ideal border contours should closely follow the anatomical features of the ridge, ensuring a proper seal and preventing food impaction or discomfort for the patient.

Effective adaptation of the RPD relies on the impression material capturing the necessary details of the soft and hard tissues. If gaps are present, it indicates a failure in capturing those contours accurately, which can lead to issues such as instability of the prosthesis and potential soreness in the oral tissue.

Conversely, fitting the impression material correctly would indicate satisfactory engagement of the tissues, while overextended posterior borders may not show gaps but rather an incorrect adaptation causing unnecessary pressure. Consistently even thickness of the denture base is a desirable characteristic that supports proper function but does not necessarily reflect the border contour adequacy related to gaps. Therefore, visible gaps along the edges serve as a clear indicator that adjustments to the border contours are needed for proper fit and function of the RPD.