Which criteria should not be present for an abutment tooth to be acceptable?

For an abutment tooth to be deemed acceptable for supporting a removable partial denture, it is crucial that it exhibits certain characteristics that ensure stability and longevity of the prosthesis. Among the criteria, the presence of furcation involvement signifies a compromise in periodontal health, which can lead to increased mobility of the tooth. This could result in insufficient support for the RPD and potentially undermine its functionality.

In contrast, minor restorations are generally acceptable since they may not significantly affect the integrity or strength of the tooth. Good tooth contours contribute to proper retention and stability of the denture, facilitating optimal occlusion and aesthetics. Additionally, good crown retention indicates that the tooth has been adequately restored and is secure enough to support the RPD. Therefore, the presence of furcation involvement is not acceptable, as it detracts from the reliability needed for an effective abutment.