In a distal extension RPD case, what type of clasp is needed on the posterior abutment teeth?

In a distal extension removable partial denture (RPD) case, the design must consider the challenges posed by the absence of posterior teeth, which often necessitates additional support and retention strategies. A circumferential clasp with mesial retention is the ideal choice for posterior abutment teeth in this scenario because it wraps around the tooth, providing retention and stability against dislodgement forces when the RPD is in function.

The circumferential clasp engages both the buccal and lingual surfaces of the abutment tooth, effectively balancing the forces of occlusion and providing a lever mechanism that aids in maintaining the position of the removable prosthesis. The mesial retention aspect is particularly important, as it helps to secure the prosthesis against the forces that tend to displace the denture posteriorly, especially in cases of distal extensions.

In contrast, while cast retentive clasps can also provide retention, they may not be as effective in distal extension situations due to their design and the potential for movement away from the supporting structures. Undercut clasps typically do not offer the same level of security against forces that could lead to dislodgment. A maxillary clasp refers to clasps used in the maxillary arch specifically and does not