RPD Review Questions
Incorrect. The statement is true but not the BEST answer. Incisal rests on lower anteriors are generally used when the lingual slope of the teeth is so steep that adquate rest seats cannot be prepared. If the rest seats and rests "hook" over the incisal edges of the teeth, the rests will provide very positive vertical stops.
Incorrect. The statement is true but not the BEST answer. Incisal rests certainly may interfere with the opposing occlusion. For this reason, the incisal rest seat must be deep enough that most or all of the rest will sit within the confines of the rest seat.
Incorrect. The statement is true but not the BEST answer. Incisal rests should not be used on maxillary incisors because of esthetic considerations and because the minor connector between the major connector and the rest often interferes with the occlusion.
Correct. #4 is the BEST answer because 1, 2, and 3 are all true statements.