When a clasp is in place on the tooth, which of its parts should be active?
1. Retentive clasp terminal
2. Reciprocal clasp arm
3. Retentive clasp arm
4. None of the above
ProsthodonticsAnswer: 4
Optimum crown to root ratio of the tooth to be used as abutment is 1) 1:2 2) 2:3 3) 1:1 4) 2:1
ProsthodonticsAnswer: 2
Face-bow measures relationship of maxilla to 1. Opening and closing axis 2. Mandible 3. Zygomatic bone 4. None of the above
ProsthodonticsAnswer: 1
Relining of the distal extension base is indicated when 1) Occlusal contact is lost without rotation of the base 2) Occlusal contact is lost with rotation of the base 3) Occlusal contact is firm but with rotation of jaw bases 4) All of the above
ProsthodonticsAnswer: 2
To allow space for the dentures, most tuberosity reduction require 1) Only soft fibrous tissue removal 2) Large part of the bone to be removed 3) Removal of bone always 4) Reduction of bone always on both sides
ProsthodonticsAnswer: 1
One of the most important function of the clasp besides retention is 1) Contralateral stabilities of the RPD 2) Distribution of stresses to abutment tooth 3) Both of the above 4) None of the above
ProsthodonticsAnswer: 2
An important advantage of the I-bar retainer in the RPI concept, is that,
1 since the tooth contour is not altered food accumulation against the tooth surface is minimized
2 the I bar is passive in its relationship to the abutment tooth against vertical displacing forces
3 it provides more horizontal stability than other retainers
4. it is more retentive
ProsthodonticsAnswer: 1
When taking a reline impression for an denture, which is the most common error? 1) Failure to remove undercuts 2) Improperly rounded peripheries 3) Improper establishment of a post dam area 4) Changed centric occlusion
