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50 Cards in this Set
- Front
- Back
Which of the following methods of
instrument sterilization uses the lowest temperature? A. Steam autoclave. B. Dry heat oven. C. Ethylene oxide method. D. Glass bead sterilizer. E. Alcohol autoclave. |
C. Ethylene oxide method.
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When root canals are treated topically with
antibiotics rather than with disinfectants 1. a greater success rate results. 2. the same rules of mechanical preparation and filling must be observed. 3. treatment may be completed in fewer appointments. 4. there is greater assurance that all micro-organisms are destroyed. 5. there is a danger of sensitizing patients to antibiotics. |
2. the same rules of mechanical
preparation and filling must be observed. 5. there is a danger of sensitizing patients to antibiotics. |
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The antibiotic of choice for infections of
pulpal origin is A. penicillin V. B. lincomycin. C. erythromycin. D. tetracycline. |
A. penicillin V.
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Endodontic therapy is
CONTRAINDICATED in teeth with A. inadequate periodontal support. B. pulp stones. C. constricted root canals. D. accessory canals. E. curved roots. |
A. inadequate periodontal support.
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Periapical surgery is
CONTRAINDICATED for a tooth that has a A. large periapical rarefaction. B. fistula related to a periapical lesion. C. vertical root fracture. D. fracture of the root apex and a necrotic pulp. E. a post and core retained crown. |
C. vertical root fracture.
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A patient telephones and tells you he has
just knocked out his front tooth but that it is still intact. Your instructions should be to A. put the tooth in water and come to your office at the end of the day. B. wrap the tooth in tissue and come to your office in a week's time. C. put the tooth in alcohol and come to your office immediately. D. place tooth under the tongue and come to your office immediately. E. place the tooth in milk and come to your office immediately. |
E. place the tooth in milk and come to
your office immediately. |
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The placement of a retentive pin in the
proximal regions of posterior teeth would MOST likely result in periodontal ligament perforation in the A. mesial of a mandibular first premolar. B. distal of a mandibular first premolar. C. distal of a mandibular first molar. D. mesial of a mandibular first molar. |
C. distal of a mandibular first molar.
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For a cast gold restoration, a gingival
bevel is used instead of a shoulder because a bevel 1. protects the enamel. 2. increases retention. 3. improves marginal adaptation. 4. increases the thickness of gold. |
1. protects the enamel.
3. improves marginal adaptation. |
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Firm contact between approximating teeth
is important because it A. locates the marginal ridges of each tooth. B. keeps the teeth from having any movement during function. C. insures proper cusp form and increases masticatory efficiency. D. stabilizes the dental arches and gives protection to the gingival papillae. |
D. stabilizes the dental arches and gives
protection to the gingival papillae. |
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In determining the ideal proximal outline
form for a Class II amalgam cavity preparation in a molar the 1. axial wall should be 1.5mm deep. 2. gingival cavosurface margin must clear contact with the adjacent tooth. 3. proximal walls diverge occlusally. 4. facial and lingual proximal cavosurface margins must just clear contact with the adjacent tooth. |
2. gingival cavosurface margin must
clear contact with the adjacent tooth. 4. facial and lingual proximal cavosurface margins must just clear contact with the adjacent tooth. |
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In complete dentures with teeth set in a
normal horizontal overlap relationship, the selective grinding rule for removing premature contacts on the working side is to grind A. only the fossae of teeth. B. the buccal cusps of maxillary and lingual cusps of mandibular teeth. C. only the mandibular teeth. D. lingual and buccal cusps of maxillary teeth. E. the maxillary and mandibular cuspids. |
B. the buccal cusps of maxillary and
lingual cusps of mandibular teeth. |
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The inferior border of the lingual bar of a
mandibular removable partial denture should A. displace the lingual frenum. B. be in contact with the cingula of the incisor teeth. C. be superior to the gingival border. D. be as inferior as the movement of the frenum of the tongue will permit. |
D. be as inferior as the movement of the
frenum of the tongue will permit. |
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Movement of a mandibular distal
extension (Class 1) partial denture away from the denture bearing tissues when the patient opens is primarily caused by A. xerostomia. B. group function occlusion. C. non-passive retentive arms. D. overextended borders. |
D. overextended borders.
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To evaluate an existing occlusion,
diagnostic casts should be mounted on an articulator in A. centric relation. B. balancing occlusion. C. either centric relation or balancing occlusion. D. horizontal protrusive relation |
A. centric relation.
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The stiffness of a material can best be
described by the A. modulus of elasticity. B. percentage elongation. C. modulus of resilience. D. elastic limit. |
A. modulus of elasticity.
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In a porcelain fused to gold restoration,
which property must be modified between porcelain and gold to reduce the bond shear stress? A. Compressive strength. B. Tensile strength. C. Modulus of elasticity. D. Thermal coefficient of expansion. E. Yield strength. |
D. Thermal coefficient of expansion.
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An excessively thick palatal bar of a
maxillary partial denture will A. cause injury to the abutment teeth. B. distort under occlusal stress. C. irritate the palatal tissues. D. cause difficulty in swallowing. |
D. cause difficulty in swallowing.
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A distal extension removable partial
denture is one that receives its support A. from the tissues only. B. mostly from the tissues. C. mostly from the abutment teeth. D. equally from the abutment teeth and the tissues. |
B. mostly from the tissues.
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For a patient with new complete dentures,
errors in centric occlusion are best adjusted by A. directing the patient to close the jaws, bringing the teeth into occlusion. B. having the patient close in centric occlusion and making a transfer record to the articulator. C. having the patient leave the dentures out of the mouth for 24 hours. D. remounting the dentures in the articulator using remount casts and new interocclusal records. |
D. remounting the dentures in the
articulator using remount casts and new interocclusal records. |
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Biologically, the gingival aspect of a
pontic which touches the healed alveolar ridge would be A. convex in the mesio-distal direction. B. concave in the facio-lingual direction. C. convex in all directions. D. shaped for pleasant esthetics. E. in line with the height of the residual ridge. |
C. convex in all directions
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When the mandible makes hinge closure
in its most retruded, unstrained position and all teeth meet in maximum intercuspation simultaneously, the condition is described as A. centric occlusion. B. group function. C. balanced occlusion. D. centric occlusion coinciding with centric relation. |
D. centric occlusion coinciding with
centric relation. |
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The principal advantage of polyether
impression materials over polysulfide polymer impression materials is A. longer shelf life. B. superior accuracy. C. superior surface on the cast. D. less dimensional change with time. |
D. less dimensional change with time.
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The polishing of an amalgam restoration
A. should not be performed before 24 hours after insertion. B. completely prevents tarnish from occurring. C. removes the mercury rich surface layer of the amalgam. D. is more permanent if the surface is heated during the procedure. |
A. should not be performed before
24 hours after insertion. |
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A decrease in the particle size of the
amalgam alloy will affect the amalgam by A. increasing flow. B. decreasing expansion. C. retarding setting rate. D. increasing early strength. |
D. increasing early strength.
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Gold alloy can be given a white colour by
introducing sufficient A. zinc. B. copper. C. cadmium. D. palladium. |
D. palladium.
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The use of a reservoir on the sprue of a
wax pattern decreases A. volumetric changes in the casting. B. casting porosity from inclusion of gases. C. casting porosity from inclusion of foreign bodies. D. casting porosity during solidification |
D. casting porosity during solidification
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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. |
B. is the difference between occlusal
vertical dimension and rest vertical dimension. |
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Marginal leakage of a composite resin
restoration will A. not be detectable. B. be minimized by use of a bonding agent. C. decrease with longevity. D. None of the above. |
B. be minimized by use of a bonding
agent. |
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The coefficient of thermal expansion of
composite resins is A. greater than that of enamel. B. the same as that of enamel. C. less than that of enamel. D. the same as that of amalgam. E. the same as that of glass ionomer cement. |
A. greater than that of enamel.
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Molecular attraction between unlike
substances is called A. adhesion. B. cohesion. C. syneresis. D. absorption. |
A. adhesion
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The modulus of elasticity of a material is
determined by A. dividing stress by strain below elastic limit. B. dividing strain by stress. C. multiplying proportional limit by strain. D. squaring proportional limit and dividing by strain. |
A. dividing stress by strain below elastic
limit. |
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Polysulfide rubber base impressions
should be A. poured immediately. B. allowed to stand a half hour before pouring. C. immersed in a fixing solution before pouring. D. immersed in water 10 minutes before pouring. E. coated with a thin film of separating medium. |
B. allowed to stand a half hour before
pouring. |
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Distortion of a wax pattern is mainly due
to A. insufficient plasticity during manipulation. B. insufficient bulk of material. C. relaxation of stresses introduced during manipulation. D. insufficient paraffin ingredient. E. refrigeration. |
C. relaxation of stresses introduced
during manipulation. |
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Which of the following is the hardest?
A. Amalgam. B. Enamel. C. Composite resin. D. Silicate cement. E. Type IV gold alloy. |
B. Enamel.
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The greatest dimensional change in
denture bases will occur A. after the dentures have been in the mouth 24~hours. B. when the dentures have been stored in tap water at room temperature. C. when a complete denture opposes natural teeth. D. at the time the dentures are removed from the flask. |
D. at the time the dentures are removed
from the flask. |
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Glass ionomer cement restorations are
indicated for A. root caries. B. incisal edge fractures. C. Class II lesions in adults. D. locations where esthetics are important. |
A. root caries.
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Varying the mercury content of an
amalgam results in which of the following? A. The higher the mercury content the greater the strength. B. The higher the mercury content the less the flow. C. The lower the mercury content the greater the flow. D. The lower the mercury content the greater the strength. |
D. The lower the mercury content the
greater the strength. |
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Dental amalgam restorations
A. show decreased flow when the tin mercury phase is increased. B. contain nickel to increase the yield strength. C. show decreased corrosion and marginal breakdown when the copper tin phase is increased. D. contain zinc to reduce galvanic corrosion. |
C. show decreased corrosion and
marginal breakdown when the copper tin phase is increased |
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After the cementation of a crown, which
of the following is most likely to result in chronic gingivitis? A. A subgingival finish line. B. A supragingival finish line. C. An undercontoured crown. D. An overcontoured crown. |
D. An overcontoured crown.
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In fixed bridge construction, where the
vertical dimension has to be increased, the most important consideration is whether A. there is sufficient tooth bulk in the abutment teeth for crown retention. B. the inter-occlusal distance will be physiologically acceptable. C. the aesthetic appearance of the patient will be improved. D. an unfavorable crown-root ratio may develop. |
D. an unfavorable crown-root ratio may
develop. |
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The gingival tissues remain healthier when
margins of crowns are placed A. about lmm below the gingival crest. B. about 5mm below the gingival crest. C. above the gingival crest. D. at the gingival crest. |
C. above the gingival crest.
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The articular disc of the
temporomandibular joint is moved by the A. lateral (external) pterygoid muscle. B. medial (internal) pterygoid muscle. C. temporal muscle. D. fibres of the masseter muscle. E. upper fibres of the buccinator muscle. |
A. lateral (external) pterygoid muscle
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The maxillary labial frenum contains
A. fibres of the orbicularis oris muscle. B. fibres of the levator anguli oris muscle. C. fibres of the levator labii superioris muscle. D. no muscle fibres. |
A. fibres of the orbicularis oris muscle.
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Which of the following is classified as a
muscle of mastication? A. Temporalis. B. Buccinator. C. Digastric. D. Mylohyoid. |
A. Temporalis.
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Which of the following bacterial types is
implicated in the initiation of gingivitis? A. Streptococcus salivarius. B. Streptococcus mutans. C. Leptothrix buccalis. D. Actinomyces viscosus. |
B. Streptococcus mutans.
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Which is the LEAST effective method of
instrument sterilization? A. Chemical solutions. B. Dry heat. C. Chemical autoclave. D. Steam autoclave. |
A. Chemical solutions.
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Anti-plaque mouth washes should be
A. adsorbed onto teeth and other oral surfaces. B. activated by salivary amylase. C. deactivated by salivary amylase. D. absorbed by mucosa. |
B. activated by salivary amylase.
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Which of the following penicillins is
LEAST resistant to the level of acidity found in the stomach? A. Benzylpenicillin. B. Phenoxymethylpenicillin. C. Amoxicillin. D. Ampicillin. |
A. Benzylpenicillin.
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In congestive heart failure, a glycoside
that increases the force of myocardial contraction is A. digitoxin. B. quinidine. C. amyl nitrite. D. procainamide hydrochloride |
A. digitoxin.
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An excess of which hormone is associated
with increased sensitivity to epinephrine? A. Testosterone. B. Parathyroid hormone. C. Insulin. D. Thyroxin. E. Estrogen. |
D. Thyroxin
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