Which component provides vertical support for an RPD by resting on the tooth surface?

Which component provides vertical support for an RPD by resting on the tooth surface?

• A. Retentive arms
• B. Reciprocating arms
• C. Major connector
• D. Rests

Answer: (D)

The key idea is that vertical support in an RPD comes from the rest, which sits on a prepared tooth surface to carry and transfer occlusal loads. When the denture functions, the rest provides a seat on the tooth that resists the base sinking toward the mucosa and helps distribute forces along the long axis of the abutment tooth. This stabilizes the denture vertically and helps maintain the proper bite and space. Other components have different roles: retention is provided by arms that grip the tooth or clasp to resist dislodgement along the path of insertion, while reciprocating arms balance those forces and protect the abutment tooth. The major connector links parts of the framework across the arch but does not provide direct vertical support to the denture base. So the rest is the element that rests on the tooth surface to give vertical support.

The key idea is that vertical support in an RPD comes from the rest, which sits on a prepared tooth surface to carry and transfer occlusal loads. When the denture functions, the rest provides a seat on the tooth that resists the base sinking toward the mucosa and helps distribute forces along the long axis of the abutment tooth. This stabilizes the denture vertically and helps maintain the proper bite and space.

Other components have different roles: retention is provided by arms that grip the tooth or clasp to resist dislodgement along the path of insertion, while reciprocating arms balance those forces and protect the abutment tooth. The major connector links parts of the framework across the arch but does not provide direct vertical support to the denture base. So the rest is the element that rests on the tooth surface to give vertical support.