Most common reason for failure of rest seat in RPD is :

 # Most common reason for failure of rest seat in RPD is : 

A. Improper rest seat preparation 

B. Contaminated metal 

C. Distorted occlusal rest 

D. Excessive occlusal forces 

The correct answer is A. Improper rest seat preparation.

The most common reason for failure of rest seat in RPD is improper rest seat preparation. Inadequate preparation will result in either occlusal interference or perforation of the metal due to lack of clearance. Failure of rest seat due to contaminated metal or distortion is very rare. 

Reference: McCracken's

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