What is the primary functional purpose of onlay occlusal rests?

What is the primary functional purpose of onlay occlusal rests?

• A. Resistance to tipping
• B. Stabilize the minor connector
• C. Restoration of occlusal plane
• D. Provide direct retention

Answer: (C)

Onlay occlusal rests are placed on the occlusal surfaces of abutment teeth to create a well-defined occlusal stop at the correct height, which reestablishes a stable occlusal plane for the removable denture. By restoring the occlusal plane, the denture can seat reliably, receive balanced occlusal contacts, and transmit functional forces along the long axis of the abutment teeth, helping maintain vertical dimension and overall stability. While rests do contribute to resisting tipping, their distinctive purpose here is to restore the occlusal plane; they do not provide direct retention like clasps or attachments, nor are they primarily intended to stabilize the minor connector.

Onlay occlusal rests are placed on the occlusal surfaces of abutment teeth to create a well-defined occlusal stop at the correct height, which reestablishes a stable occlusal plane for the removable denture. By restoring the occlusal plane, the denture can seat reliably, receive balanced occlusal contacts, and transmit functional forces along the long axis of the abutment teeth, helping maintain vertical dimension and overall stability. While rests do contribute to resisting tipping, their distinctive purpose here is to restore the occlusal plane; they do not provide direct retention like clasps or attachments, nor are they primarily intended to stabilize the minor connector.