fixed rpd cd occlusion

8/11/2019 Fixed RPD CD occlusion

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202

5. A facebow is used to record the

1. vertical dimension of occlusion.

2. inter-occlusal relationship.

3. horizontal condylar inclination.

4. relationship of the maxilla to the hinge axis.

A. (1) (2) (3)

B. (1) and (3)

C. (2) and (4)

D. (4) only.

E. All of the above.

A facebow can be used to conveniently

relate the casts to an approximate hinge

Prosthodontic treatment p83


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206

9. In comparing polysulfide, polyether and addition cured silicone

impression materials, which of the following statements is true?A. All three of the materials contract slightly during curing.

B. All the materials expand slightly upon cooling from mouth temperature

(37

degrees C) to room temperature (20 degrees C).

C. After one week, addition cured silicones will undergo more distortion

than polysulfides. D. Lead oxide is used as an activator in silicones


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Craig p291


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207

1. In minimizing the firing shrinkage of porcelain, the principal factor is the

A. fusion temperature.

B. ratio of flux to feldspar.

C. uniformity of particle size.

D. thoroughness of condensation.


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207

5.The main purpose of flux in soldering is to

A. dissolve surface oxides and prevent further oxidation.

B. prevent recrystallization and grain growth.

C. prevent oxidation and lower the melting range of the solder.

D. dissolve surface oxides and lower the melting range.

Shilngburgh p374


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2072. The higher modulus of elasticity of a chromium-cobalt-nickel alloy,

compared to a Type IV gold alloy, means that chromium- cobalt-nickel partial

denture clasp will require

A. a heavier cross section for a clasp arm.

B. a shorter retentive arm.

C. more taper.

D. a shallower undercut.


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196

7. Zinc-oxide-Egenol cements are

A. less soluble than zinc phosphate cements.

B. more soluble than zinc phosphate cements.

C. as soluble as zinc phosphate cements.

D. less soluble than glass ionomer cements.


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207

3. Which of the following physical properties would be_least_important for an

impression material for partially edentulous patients?

A. Biocompatibility.

B. Dimensional stability.

C. Ease of manipulation.

D. Adhesion to calcium.

E. Elasticity.


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207

9. In treatment planning for a removable partial denture, a knife-edge bony ridge

will

A. make impression-taking difficult.

B. necessitate relief to the partial denture.

C. cause difficulty in tooth selection.

D. None of the above.


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208

5. Improper temporary coverage of bridge abutments can cause

A. increased tooth sensitivity. B. gingival recession.

C. tooth migration.

D. occlusal prematurities.



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208

2. An epinephrine-containing retraction cord has the potential of

A. interfering with the setting of the impression material.

B. causing tissue necrosis.

C. producing a systemic reaction.

D. discolouring gingival tissue.


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208

6.During the fabrication of new complete dentures, which of the following can bemodified to achieve the desired occlusion?

1.The compensating curve.

2.The orientation of the occlusal plane.

3.The cusp inclination.

4.The condylar inclination

A. (1) (2) (3)

B. (1) and (3)

C. (2) and (4)

D. (4) only



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2083.A cast post and core is used to

1.provide intraradicular venting.

2.strengthen a weakened tooth.

3.redirect the forces of occlusion.

4.provide retention for a cast crown.

A. (1) (2) (3)

B. (1) and (3)

C. (2) and (4)

D. (4) only



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208

7. At his first post insertion appointment, a patient with a new removable

partial denture complains of a tender abutment tooth. The most likely cause is

A. overextended borders of the partial.

B. inadequate polishing of the framework.

C. improper path of insertion.

D. the occlusion.


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208

4. The gingival margin of the preparation for a full crown on a posterior tooth,

with a clinical crown that satisfies the requirements for retention and

resistance, should be placed

A. 0.5mm subgingivally.

B. on the enamel.

C. at least 1mm supragingivally.

D. at the cemento-enamel junction. E. at the gingival margin.


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208

8. In the design of a removable partial denture, guiding planes are made

A. parallel to the long axis of the tooth.

B. parallel to the path of insertion.

C. at a right angle to the occlusal plane.

D. at a right angle to the major connector.


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209

1. The purpose of a temporary restoration in an anterior tooth is to

A. maintain aesthetics.

B. protect dentin and pulp.

C. prevent gingival inflammation and recession.

D. prevent tooth movement.



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209

7. Following the insertion of complete dentures, a generalized soreness over

the entire mandibular alveolar ridge can be caused by

A. Inadequate interocclusal distance.

B. impingement on the buccal frenum.

C. high muscle attachments.

D. excess border thickness.


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209

3. Which of the following should be checked first when a cast gold crown that

fits on its die cannot be seated on its abutment?

.

A. The occlusal contacts.

B The taper of the preparation.

C The proximal contacts.

D. The impression used to pour the cast.


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209

8. Patients with new dentures should be instructed to

1. clean dentures over a bowl of water.

2. hold dentures properly when cleaning.

3. correct minor soreness by filing dentures.

4. persist with soreness for one week, then return for an appointment.

A. (1) (2) (3)

B. (1) (2) (4)

C. (1) and (2)

D. (2) and (4)



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210

1. Speech defects associated with a maxillary partial denture can be caused by

1. replacing the teeth too soon after extraction.

2. providing excessive bulk of denture base.

3. positioning anterior teeth incorrectly.

A. (1) and (3)

B. (1) and (2)

C. (2) and (3)

D. (2) only


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210

5. In planning a bilateral distal extension (free- end) mandibular removable

partial denture, the most important considerations are

1. aesthetics.

2. stress distribution.

3. rigid clasping.

4. maximum tissue coverage.

A. (2) and (4)

B. (1) and (2)

C. (1) (2) (3)

D. All of the above.


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210

2. The major connector of a removable partial denture should be

designed to

A. connect rigidly the component parts of the partial denture.

B. act as a stress-breaker.

C. dissipate vertical forces.

D. None of the above


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210

7.Upon examination of an edentulous patient, it is observed that the tuberosities

contact the retromolar pads at the correct occlusal vertical dimension.

The treatment of choice is to

A. reduce the retromolar pads surgically to provide the necessary clearance.

B. reduce the tuberosities surgically to provide the necessary clearance.

C. construct new dentures at an increased occlusal vertical dimension to gain

thenecessary clearance.

D. proceed with construction of the denture and reduce the posterior extension

of the mandibular denture to eliminate interferences


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211

2. The use of a retraction cord impregnated with 8

percent racemic epinephrine may be hazardous for some patients because of its

A. local caustic action on the gingival tissue.

B. potential for systemic reaction.

C. local astringent action.



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211

5. The interocclusal distance (freeway space)

A. is the difference between occlusal vertical dimension and hinge-axis

registration.

B. is the difference between occlusal vertical dimension and rest vertical

dimension.

C. is usually l0 mm in the premolar region.

D. is the distance between centric occlusion and centric relation.


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2118. A maxillary complete denture exhibits more retention and stability than

a mandibular one because it

1. covers a greater area.

2. incorporates a posterior palatal seal.

3. is not subject to as much muscular displacement.

4. is completely surrounded by soft tissue.

A. (1) (2) (3)

B. (1) and (3)

C. (2) and (4)

D. (4) only



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2111. The purpose of relining a distal saddle of a removable partial denture is to

improve

1. tissue adaptation.

2. occlusion.

3. function.

4. fit of the framework.

A. (1) (2) (3)

B. (1) (3) (4)

C. (1) (2) (4)

D. (2) (3) (4)


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212

5.Immediately prior to cementation of a fixed bridge, it is important to check

A. occlusal relationships.

B. firmness and location of contact points.

C. pressure of pontics against soft tissues.

D. All of the above


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2126. To decrease abutment tooth sensitivity, a fixed bridge may be temporarily

seated using

A. poly-carboxylate cement.

B. acrylic resin cement.

C. zinc-oxide-eugenol cement.

D. glass ionomer cement.


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212

2. The prime advantage of vacuum firing of porcelain is

A. better colour.

B. less shrinkage.

C. more translucency.

D. increased strength.


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2123. A circumferential clasp arm on a tooth is one which

A. originates above the height of contour.

B. approaches the undercut from an occlusal direction.

C. traverses a portion of the suprabulge of the tooth.

D. All of the above.


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2131. The location of a crown margin is determined by

1. esthetic requirements.

2. clinical crown length.3. presence of caries.

4. presence of an existing restoration.

A. (1) (2) (3)

B. (1) and (3) C. (2) and (4)

D. (4) only



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215If an impression were taken with a mercaptan rubber base material of teeth

exhibiting severe external undercuts a stone model should be poured

A. immediately.

B. after 30 minutes.

C. after 24 hours.


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