RPD Review Questions
Support is provided almost entirely by rests. Some support is furnished by other rigid metal located above the survey line (e.g. the rigid portions of retentive arms and bracing and reciprocating arms). However, these components usually lie on inclined surfaces and should never be expected to provide primary vertical support. In the maxillary arch, some support may also be provided by the major connector if it covers a significant portion of the hard palate. When considering the RPD as a whole, the denture bases also provide support, much more so in extension RPDs than tooth-supported RPDs.