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DENTURE A

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OCCLUSIO

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215

MO

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ME

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192

1.A pontic replacing a mandibular first molar

should be designed so that it(s)

1. gingival surface is concave and adapts closely to the ridge.2. has open gingival embrasures.3. conceals the porcelain to metal junction on its gingival surface.4. gingival surface is convex in all directions.

A. (1) (2) (3) B. (1) and (3) C. (2) and (4) D. (4) only E. All of the above.

Mac p 385

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 convenientlyrelate the casts to an approximate hinge

Prosthodontic treatment p83

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 (37degrees 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

Craig p291

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.

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

207 2. 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.

207

6. During the setting phase, a dental stone mixture will exhibit

A. expansion. B. contraction. C. loss in compressive strength. D. gain in moisture content.

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.

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.

207

8. A removable partial denture is preferable to a fixed bridge when the

A. edentulous areas are large. B. abutment teeth have large undercuts. C. abutment teeth are rotated. D. residual ridges are severely resorbed. E. abutment teeth are tipped.

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.

208

5. Improper temporary coverage of bridge abutments can cause

A. increased tooth sensitivity. B. gingival recession. C. tooth migration. D. occlusal prematurities. E. All of the above.

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.

208

6.During the fabrication of new complete dentures, which of the following can be modified 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 E. All of the above.

208 3.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 E. All of the above.

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.

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.

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.

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. E. All of the above.

209

6. A facebow is used to record the

1. vertical dimension of occlusion.

2. inter-condylar distance.

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.

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.

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.

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) E. All of the above.

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

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.

210

6. Which of the following structures affects the thickness of the flange of a maxillary complete denture?

A. Malar process. B. Coronoid process. C. Mylohyoid ridge. D. Zygomatic process. E. Genial tubercle.

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

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 the

necessary clearance. D. proceed with construction of the denture and reduce the

posterior extension of the mandibular denture to eliminate interferences

210

4. Dental porcelain has

1. low compressive strength.

2. high hardness.

3. high tensile strength.

4. low impact strength.

A. (1) (2) (3) B. (1) and (3) C. (2) and (4) D. (4) only E. All of the above..

211

1. Which of the following problems of a permanent fixed bridge, detected at the delivery appointment, can be caused by an inadequate temporary restoration?

1. Hypersensitivity of the abutments that decreases after permanent luting.

2. Exposed gingival margins in an esthetic area.

3. Contacts with adjacent teeth that prevent complete seating of the bridge.

4. Need for significant occlusal adjustment

A. (1) (2) (3) B. (1) and (3) C. (2) and (4) D. (4) only E. All of the above.

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. D. None of the above.

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.

2117. In cementing a full crown, it is desirable to

A. retard the set of the cement. B. apply continuous occlusal loading. C. have excess cement covering the margins. D. All of the above.

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 E. All of the above.

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)

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

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.

212

2. The prime advantage of vacuum firing of porcelain is

A. better colour. B. less shrinkage. C. more translucency. D. increased strength.

212 3. 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.

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 E. All of the above.

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. D. None of the above.