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50 Cards in this Set
- Front
- Back
A vital canine is to be used as the anterior
abutment of a four unit fixed partial denture and it has 2mm remaining coronal tooth structure. The most acceptable foundation restoration would be A. a bonded amalgam. B. a pin retained amalgam core buildup. C. a pin retained composite resin core build-up. D. intentional devitalization followed by a post and core restoration. |
D. intentional devitalization followed by
a post and core restoration. |
|
If a cast is tripoded it serves as a useful
method of A. determining the path of insertion. B. locating unfavorable tissue undercuts. C. locating the height of contour. D. returning the cast to the surveyor. |
D. returning the cast to the surveyor.
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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. |
D. a shallower undercut.
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High humidity in a room where zinc oxide
and eugenol impression paste is being mixed will A. increase the setting time. B. not affect the setting. C. prevent any setting. D. decrease the setting time. |
D. decrease the setting time.
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The addition of platinum to a dental gold
alloy results in increased 1. strength. 2. hardness. 3. melting point. 4. resistance to corrosion. |
E. All of the above.
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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. |
A. dissolve surface oxides and prevent
further oxidation. |
|
While the teeth are set in wax, dentures
are tried in to A. verify the maxillomandibular records. B. verify the vertical dimension of occlusion. C. evaluate esthetics. D. All of the above. |
D. All of the above.
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During the setting phase, a dental stone
mixture will exhibit A. expansion. B. contraction. C. loss in compressive strength. D. gain in moisture content |
A. expansion.
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Heated impression modeling compound is
"tempered" in warm water before placement in the mouth in order to A. avoid burning the soft tissues. B. reduce contraction error. C. initiate a chemical reaction. D. minimize distortion. |
A. avoid burning the soft tissues.
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Prior to pouring a stone model, the
immersion of a hydrocolloid impression in 2~percent potassium sulphate for 2~to~5~minutes will A. retard the set. B. accelerate the set. C. inhibit the formation of bubbles. D. prevent distortion of the hydrocolloid material. |
B. accelerate the set.
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Which of the following prevents distortion
of a reversible hydrocolloid impression material? A. Slow removal from undercuts. B. Storage in 100 percent humidity for 30 minutes. C. Storage in air. D. Storage in 2 percent solution of potassium sulfate for 60 minutes. |
B. Storage in 100 percent humidity for
30 minutes. |
|
The exudate produced on the surface of an
alginate impression through syneresis acts as A. a lubricant between the impression material and the gypsum cast. B. a medium that aids in producing distinct details on the surface of the resultant gypsum cast. C. a medium that aids in producing a hard surface on the gypsum cast. D. None of the above. |
D. None of the above.
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After cementation of a fixed bridge, the
patient should be advised to 1. avoid hot liquids. 2. stimulate the gingival tissue with massage. 3. use dental floss under the pontic. 4. return for periodic examination. 5. avoid sticky foods. |
2. stimulate the gingival tissue with
massage. 3. use dental floss under the pontic. 4. return for periodic examination |
|
The major disadvantage of zinc phosphate
used to cement crowns is the A. development of heat during setting. B. pulp irritation. C. lack of edge strength. D. low crushing strength. |
B. pulp irritation.
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A pontic replacing a mandibular first
molar should be designed so that 1. it seals the muco-gingival field. 2. it has opened gingival embrasures. 3. it conceals the porcelain to metal junction on its gingival surface. 4. its gingival surface is convex in all directions. |
2. it has opened gingival embrasures
4. its gingival surface is convex in all directions. |
|
A fixed bridge pontic should
1. restore tooth function. 2. reduce thermal conductivity. 3. be biologically acceptable. 4. reduce galvanic reactions between abutments and other restorations. 5. restore aesthetics. |
1. restore tooth function.
3. be biologically acceptable. 5. restore aesthetics. |
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In a "cuspid guided occlusion"
A. the teeth on the non-working side make contact on lateral excursions. B. the teeth on the working side make contact on lateral excursions. C. the posterior teeth make no contact on lateral excursions on the working side. D. None of the above. |
C. the posterior teeth make no contact
on lateral excursions on the working side. |
|
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. |
C. producing a systemic reaction.
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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. |
4. provide retention for a cast crown
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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. |
C. at least 1mm supragingivally.
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In treatment planning for a fixed bridge,
the necessary clinical data should include 1. an assessment of any discrepancy between centric occlusion and centric relation. 2. the type of impression materials to be used. 3. an evaluation of the forces of mastication. 4. the aesthetic considerations. |
1. an assessment of any discrepancy
between centric occlusion and centric relation. 3. an evaluation of the forces of mastication. 4. the aesthetic considerations. |
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Adjustment of the occlusal plane of
natural teeth opposed by a complete or partial denture should be completed A. after the teeth have been set on the trial denture. B. immediately after making the final casts. C. upon delivery of the denture. D. after the diagnosis and treatment plan has been established. |
D. after the diagnosis and treatment plan
has been established. |
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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. |
1. The compensating curve.
2. The orientation of the occlusal plane 3. The cusp inclination. |
|
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. |
D. the occlusion.
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Wrought gold alloy clasps are superior to
cast gold clasps of the same crosssectional area because they 1. exhibit greater flexibility. 2. are coarser grained. 3. are more accurately adapted to the tooth. 4. have a higher proportional limit. |
1. exhibit greater flexibility.
4. have a higher proportional limit. |
|
Abutment teeth for a removable partial
denture may be best preserved by A. splinting with adjacent teeth. B. Full coverage wth veneer crowns. C. prosthesis design. D. all of the above. |
C. prosthesis design
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In removable partial denture design, the
surface of the abutment tooth most often altered to provide clasp reciprocity is A. mesial. B. distal. C. occlusal. D. buccal. E. lingual. |
E. lingual.
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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. |
B. parallel to the path of insertion.
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Rests on terminal abutment teeth for a cast
metal removable partial denture provide A. primary retention. B. indirect retention. C. occlusal force transmission. D. lateral force transmission. |
C. occlusal force transmission.
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For a removable partial denture, a metal
base is preferred to an acrylic base because metal is A. more hygienic. B. stronger. C. less irritating. D. a better thermal conductor. E. All of the above. |
E. All of the above.
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Compared with zinc-phosphate cement,
polycarboxylate cement has A. longer working time. B. lower film thickness. C. increased compressive strength. D. superior biologic compatibility. |
D. superior biologic compatibility.
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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. |
C. The proximal contacts.
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In the preparation of gypsum products, an
increase in the water/powder ratio will A. increase the surface hardness. B. increase the compressive strength. C. accelerate the setting reaction. D. None of the above. |
D. None of the above
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Which of the following are effects of cold
working a metal? 1. Increase in ductility. 2. Decrease in ductility. 3. Increase in hardness. 4. Increase in resistance to corrosion. |
2. Decrease in ductility.
3. Increase in hardness. |
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Reversible hydrocolloids transform from
sol to gel and gel to sol as a function of the A. concentration of the fillers and plasticizers. B. percent composition by weight of water. C. concentration of potassium sulfate. D. temperature. |
D. temperature.
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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 |
2. inter-condylar distance.
4. relationship of the maxilla to the hinge axis |
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Denture stomatitis can be associated with
A. candida albicans infection. B. xerostomia. C. inadequate denture hygiene. D. ill-fitting dentures. E. All of the above |
E. All of the above
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Xerostomia can be associated with
A. hormonal imbalance. B. hypertension and anxiety. C. adverse effects of medication. D. emotional problems. E. All of the above. |
E. All of the above.
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Unsupported, hyperplastic tissue in an
edentulous maxilla is most often found A. near the tuberosities. B. in the vault. C. in the anterior segment of the arch. D. None of the above. |
C. in the anterior segment of the arch.
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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. |
A. Inadequate interocclusal distance.
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When a removable partial denture is
fabricated to occlude with natural teeth, the occlusal form of the artificial teeth is influenced by the A. endodontic condition of the abutment teeth. B. occlusal form of the remaining teeth. C. need to produce a fully balanced occlusion. D. None of the above. |
B. occlusal form of the remaining teeth.
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When a partial denture is to be constructed
where occlusal adjustment of the natural teeth is required, this should be performed A. prior to taking the final impressions. B. after the restoration is completed. C. prior to registering centric relation but after final impression taking. D. after the framework has been constructed. |
A. prior to taking the final impressions.
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A removable partial denture rest should
A. be extended for retention. B. increase retention of the partial denture. C. direct forces parallel to the long axis of the abutment. D. be located on a centric contact. |
C. direct forces parallel to the long axis
of the abutment. |
|
For removable partial dentures, tilting of
the cast during surveying procedures alters the 1. path of insertion. 2. direction of dislodging forces. 3. position of the survey line in relation to the horizontal plane. 4. location of the undercut and nonundercut areas of each tooth. |
1. path of insertion.
3. position of the survey line in relation to the horizontal plane. 4. location of the undercut and nonundercut areas of each tooth. |
|
Bar clasp and circumferential clasp arms
are similar in that both 1. terminate in a retentive undercut lying gingival to the height of contour. 2. originate from the framework and approach the tooth undercut area from a gingival direction. 3. provide retention by the resistance of metal to deformation rather than frictional resistance of parallel walls. 4. originate above the height of contour, traverse a portion of the suprabulge and approach the tooth undercut from an occlusal direction. |
1. terminate in a retentive undercut lying
gingival to the height of contour. 3. provide retention by the resistance of metal to deformation rather than frictional resistance of parallel walls. |
|
A removable partial denture rest should be
placed on the lingual surface of a canine rather than on the incisal surface because A. less leverage is exerted against the tooth by the rest. B. the enamel is thicker on the lingual surface. C. visibility and access are better. D. the cingulum of the canine provides a natural recess. |
A. less leverage is exerted against the
tooth by the rest. |
|
The crownçroot ratio is
1. the comparison of the length of root retained in bone to the amount of tooth external to it. 2. an important factor in abutment tooth selection. 3. determined from radiographs. 4. determined during surveying of the diagnostic cast. |
1. the comparison of the length of root
retained in bone to the amount of tooth external to it. 2. an important factor in abutment tooth selection. 3. determined from radiographs. |
|
In an edentulous maxilla, the direction of
resorption of the alveolar ridge is A. upward and palatally. B. upward and facially. C. uniform in all directions. D. upward only. |
A. upward and palatally.
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A metal in the wrought condition differs
from the same metal in the cast condition in that A. the grains are deformed and elongated. B. the yield strength and hardness are increased. C. if heated sufficiently, recrystallization can occur. D. All of the above. |
D. All of the above.
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Dental porcelain has
1. low compressive strength. 2. high hardness. 3. high tensile strength. 4. low impact strength. |
2. high hardness.
4. low impact strength. |