FixedProthodontics

121. Compare to straight root, what root configuration of a tooth below that has better prognosis as an abutment for bridge:?

σ� Curve

σ� Short

σ� Slim

σ� Pointed

122. Vital tooth is a better abutment compared to non-vital tooth because:?

σ� Better proprioception

σ� Worse proprioception

σ� Less sensitive

σ� Prone to caries

123. Can we use tooth with grade 1 mobility as an abutment for bridge?

σ� Yes

σ� No

σ� Not relevant

σ� Any teeth with any degree of tooth mobility can be used

124. If a patient is missing teeth 13-23, what arch shape has better prognosis regarding to lever force?

σ� U-shape

σ� V-shape

σ� High palatal vault

σ� Doesn’t matter what shape it is

125. A three-unit bridge has ……. Times lower deflection than a 5-unit bridge. (choose one correct answer to fill in the gap)?

σ� 3

σ� 9

σ� 18

σ� 27

126. Minimum dimension for connector of a PFM bridge:?

σ� 1.5x1.5 mm

σ� 2x2 mm

σ� 2.5x2.5 mm

σ� 3x3 mm

127. What pontic is the most difficult to clean?

σ� Sanitary

σ� Ridge lap

σ� Modified ridge lap

σ� Ovate

128. Can we use ovate pontic in case with severe vertical and horizontal ridge resorption?

σ� Yes

σ� No

σ� May be

σ� Not relevant

129. Apical extension of ovate pontic into the extracted tooth socket should be at least:

σ� 1 mm

σ� 2 mm

σ� 2.5 mm

σ� 4 mm

130. Veneering ceramic layer on a PFM restoration should not be thicker than:?

σ� 1 mm

σ� 1.5 mm

σ� 2 mm

σ� 3 mm

131. For retainer of a PFM bridge, the transition areas between metal and ceramic must be at least:?

σ� 1 mm away from any contact points in the occlusal area

σ� 1.5 mm away from any contact points in the occlusal area

σ� 2 mm away from any contact points in the occlusal area

σ� 2.5 mm away from any contact points in the occlusal area

132. For retainer of a PFM bridge, the transition areas between metal and ceramic must be at least:?

σ� 1 mm away from the proximal contact point.

σ� 1.5 mm away from the proximal contact point.

σ� 2 mm away from the proximal contact point.

σ� 2.5 mm away from the proximal contact point.

133. The following treatment is categorized in pre-prosthetic phase of the treatment plan, except:?

σ� Full mouth scaling and polishing

σ� Provisional restoration

σ� Root canal treatment

σ� Surgical removal of torus palatinus

134. Veneering ceramics for metal ceramic restoration contain a glassy matrix by volume of:?

σ� 55-65%

σ� 65-75%

σ� 75-85%

σ� 85-95%

135. Why do they need to increase the coefficient of thermal expansion (CTE) of veneering ceramics to match that of the casting alloy?

σ� To avoid compressive stress developing within the veneer when cooled.

σ� To avoid flexural stress developing within the veneer when cooled.

σ� To avoid tensile stress developing within the veneer when cooled.

σ� To avoid shear stress developing within the veneer when cooled.

136. How do porcelain chemically bond to its metal substructure?

σ� Metal ceramic

σ� Metal inhibited layer

σ� Metal oxides

σ� Base metal

137. Why do they add chromium into alloy for metal ceramic substructure?

σ� For its corrosion resistance property

σ� For chemical bonding with porcelain

σ� For formation of oxide layer

σ� All of the above

138. The following are base metals that are added into gold-based casting alloys to form oxide layer, except:?

σ� Iron

σ� Tin

σ� Indium

σ� Magnesium

139. Why do they need sandblasting of the base metal substructure before porcelain veneering?

σ� To reduce thick layer of metal oxides for optimum porcelain bonding

σ� To increase the thickness of metal oxides for optimum porcelain bonding

σ� To create smooth surface on the substructure for optimum porcelain bonding

σ� To provoke the failure in porcelain-metal interface.

140. The following are reinforced core ceramic systems, except:?

σ� Glass-infiltrated high strength ceramic core

σ� High density alumina core

σ� Lithium disilicate glass ceramic

σ� High density zirconia core

141. Y-TZP stands for:?

σ� Yttrium tetragonal zirconia polycrystals

σ� Yttrium tetrical zirconia polycrystals

σ� Ytterbium tetragonal zirconia polycrystals

σ� Yohimbine tetragonal zirconia polycrystals

142. The following are the disadvantages of reinforced ceramic core systems, except:?

σ� Cannot be etched

σ� Insufficient roughness for adequate bonding to resin

σ� Risk of chipping of veneering ceramic

σ� High opacity

143. What acid is used in etching of glass ceramic restoration before bonding to resin cement?

σ� Phosphoric acid

σ� Hydrofluoric acid

σ� Sulforic acid

σ� Hydrochloric acid

144. What acid is used in etching of enamel before bonding to resin cement?

σ� Phosphoric acid

σ� Hydrofluoric acid

σ� Sulforic acid

σ� Hydrochloric acid

145. What is the purpose of silane coupling agent in bonding with resin cement?

σ� To initiate the chemical reaction of resin cement

σ� To bond between etched glass ceramic surface and bonding agent

σ� To bond between bonding agent and resin cement layer

σ� To clean the etched glass ceramic intaglio surface

146. Choose only one correct sentence below about dental ceramics:?

σ� Zirconia can be etched by hydrofluoric acid

σ� Pure feldspathic ceramic can be used as core ceramic

σ� Alumina particles is used in sandblasting of glass ceramic

σ� Glass ceramic cannot be milled in a CAD/CAM milling machine

147. Choose the correct order of resin cement bonding onto glass ceramic: ?

σ� HF > H3PO4 > Silane > resin cement > Bonding agent

σ� HF > H3PO4 > resin cement > Silane > Bonding agent

σ� HF > H3PO4 > Silane > Bonding agent > resin cement

σ� H3PO4 > HF > Silane > resin cement > Bonding agent

148. In fiber-reinforced composite resin bridge, the fiber used is:?

σ� Polyacryic fiber

σ� Polymethylmethacrylic fiber

σ� Polyvinyl siloxane fiber

σ� Polyethylene fiber

149. The following restoration is called: ?

σ� Cantilever bridge

σ� Maryland bridge

σ� Telescopic bridge

σ� Fixed-movable bridge

150. How many grades are there in Miller index of tooth mobility?

σ� 2

σ� 3

σ� 4

σ� 5

151. What is a pontic of a fixed partial denture?

σ� The part of a FPD that replaces missing natural tooth/teeth

σ� The part of a FPD that covers abutment tooth/teeth

σ� The part of a FPD that connects retainer to connector

σ� The part of a FPD that supports the gum

152. The following are techniques in preserving alveolar ridge for FPD, except:?

σ� Ovate pontic

σ� Orthodontic extrusion

σ� Orthodontic intrusion

σ� Root submergence

153. The following are true about “alveolar preservation by ovate pontic”, except:?

σ� Atru amtic extraction

σ� 2.5 mm apical extension of the ovate pontic into the socket

σ� The seated interim restoration should cause slight blanching of interdental papilla

σ� Delayed interim FPD with ovate pontic form.

154. The following are the purpose of a surveyed crown, except:?

σ� To restore a broken-down tooth to serve as a RPD abutment

σ� When a natural tooth crown cannot provide retention for clasps

σ� When it is necessary to splint adjacent teeth to provide additional stabilization

σ� When the tooth has a favorable occlusal relationship

155. In Kennedy class III and IV, the proximal guiding planes should be:?

σ� Straight occlusally

σ� Curve occlusally

σ� Taper occlusally

σ� Divergent occlusally

156. In Kennedy class III and IV, the angle formed by the junction of the occlusal rest and guiding plane should be:?

σ� Rounded

σ� Sharp

σ� Curved

σ� Square

157. In Kennedy class III and IV, the proximal guiding planes should be:?

σ� Curved mesiodistally

σ� Curved buccolingually

σ� Straight mesiodistally

σ� Straight buccolingually

158. The following are true about occlusal rests in posterior area, except:?

σ� Should be broad facially and lingually

σ� Should encompass 1/3 to 1/2 of occlusal width

σ� Should be round and convex

σ� Should adequately clear the opposing dentition to allow at least 1 mm of metal rest thickness

159. When viewing occlusally, the occlusal rest seat of posterior tooth should have the form of:?

σ� Square

σ� Circle

σ� Triangle

σ� Oval

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