RPD Review Questions
When placing the tripod marks on the diagnostic cast, the vertical arm of the surveyor
should have the analyzing rod in place.
should be moved up or down to touch the tissues at widely separated areas.
Both 1 and 2 are true
Neither 1 nor 2 are true
The internal and external finish lines are
normally superimposed over each other.
normally offset from each other to avoid weakness in the framework.
normally designed and placed independently.
none of the above statements are true.
In general, lingual plating should be supported
by the inclined surfaces of the mandibular incisors.
with minor connectors.
with bracing arms.
A maxillary arch without three contiguous incisors (such as the one shown)
usually requires plating of the remaining incisor
should not be plated
should have a horse-shoe major connector
both 1 and 3 above.
The external finish line on the distal extension side of the mandibular Class II modification 1 RPD for the partially edentulous arch shown to the right
runs from the lingual frenum to the retromolar pad.
runs from the lingual of the guide plate to the floor of the mouth.
runs from the mesial of the guide plate to the retromolar pad.
cannot be determined without more information.
True or False
Wrought wire retentive arms are usually selected for distal extension RPDs when the tips of the arms lie behind the axis of rotation.
Occlusal rest preparations should be
at least 1/3 the buccolingual width of the occlusal surface
at least one millimeter deep
all of the above
Guide plates for anterior teeth
should be kept to the labial for best esthetics.
should be kept to the lingual for best esthetics.
be thinned on the labial aspect.
both 2 and 3 above.
An anterior-posterior palatal strap major connector is less rigid than a horse-shoe major connnector because it (the A-P strap) has less width.
The first statement is true but the reason is false.
The first statement is false and the reason is also a false statement.
The first statement is true and the reason is true.
The first statement is false but the reason is a true statement.
Your patient has the partially edentulous arch form shown. All of the abutments have good bone support. On which one of the abutments would you likely utilize a WW clasp?
None of the above.