RPD Review Questions

Answer to Question #15


The correct answer is

The rests on #19 and #28 are not indirect retainers. Rests on #21 and #27 are indirect retainers. The rest on #21 is further from a line connecting the tips of the retentive arms on theeth numbers 19 and 28 and is thus more effective than the rest on tooth #27. In reality, the rest on #27 could be omitted without appreciable loss of indirect retention.