Dental Decks
1. Which of the following types of ridges is unique to permanent maxillary molars?
a. labial ridge
b.marginal ridge
c. oblique ridge
d. transverse ridge
Answer: c. oblique ridge- it crosses the occlusal surface obliquely and is formed by the union of
the distal cusp ridge of the mesiolingual cusp and the triangular ridge of
the distobuccal cusp.
2. The primary function of the dental pulp is to:
a. protect the periodontium
b. form enamel
c. form dentin
d. assure root-end closure
Answer: c. form dentin- by the odontoblast.
3. The human dentition is composed of several kinds of teeth, serving a variety of functions.The term to denote is:
a. polyphyodont dentition
b. heterodont dentition
c. homodont dentition
d. monophyodont dentition
answer: b.heterodont dentition- hetero means “different”,- odont means “tooth”-
4. A hereditary dental defect in which the enamel of the teeth is soft and undercalcified in context yet normal in quantity is called:
a. enamel hypoplasia
b.enamel hypocalcification
c. fluorosis
answer:b. Enamel hypocalcification- the condition is caused by defective maturation of
ameloblast. The teeth are chalky in consistency, the surfaces wear down
rapidly, and a yellow to brown stain appears as the underlying dentin is
exposed.
5. Which tooth is likely to have a pronounced concavity on its mesial surface?
a. mandibular first premolar
b. maxillary second premolar
c. maxillary first premolar
d. mandibular second premolar
Answer: c.maxillary first premolar
6. The main function of cementum is:
a. to provide rough surface anchorage for attachment of Sharpey's fibers
b. to compensate for tooth wear by depositing apical cementum
c. repain in nature
d. protection of the root surface
Answer: A. to provide rough surface anchorage for attachment of Shaepey's fibers
-sharpey's fibers are the terminal portions of the principal fibers of the PDL that are
embedded in the cementum.
NBDE- Mosby's
7. Smooth surface caries refers to;
a. facial and ligual surface
b. occlusal pits and grooves
c. mesial and distal surfaces
d. a and c
Answer: d- smooth surface caries occurs on any of the axial tooth surfaces but not the
occlusal.
8. Causes of post operative sensitivity with amalgam restorations include all of the following except.
a. lack of adequate condensation, especially lateral condensation in the proximal boxes
b. voids
c. extension onto the root surface
d. lack of dentinal sealing
Answer: c- the primary causes of postoperative sensitivity for amalgam restorations are voids
especially at the marrgins, poor condensation or inadequate sealing.
9. The setting reaction of dental amalgam proceeds primarily by...
a. dissolution of the entire alloy particle into mercury
b. dissolution of the Cu from the particles into mercury
c. precipitation of Sn-Hg crystals
d. mercury reaction with Ag on or in the alloy particle
Answer: d.-the trituration process mixes the amalgam components and the reaction results in the
alloy particle being coated by mercury and a product being formed
10. Which of the following materials has the highest linear coefficient of expansion?
a. amalgam
b. direct gold
c. tooth structure
d. composite resin
Answer: d.- composite materials exhibit more dimensional change(2.5 times greater than the tooth
structure) when subjected to extreme changes in temperature than in other choices.
11. A cervical lesion should be restored if it is _____.
a. carious
b. very sensitive
c. causing gingival inflammation
d. all of the above
Answer: d.-all of these factors indicate that a cervical lesion should be restored. In addition, if the
lesion is large and the pulpal or gingival tissues are in jeopardy. It should be considered
for restoration.
12. In comparison to amalgam restoration, composite restoration are____.
a. stronger.
b. more technique sensitive
c. more resistant to occlusal forces
d. not indicated for class II restorations
Answer: b.- because the bonding process is very specific ( requiring exact, correct usage of the
various materials and an isolated, non-contaminated field. The insertion and contou-
ring of composites are more demanding and consuming.
13. The use of rubber dam is best indicated for ____.
a. Adhesive procedures
b. Quadrant densitry
c.Teeth with challenging preparations
d. Difficult patients
e. AOTO
Answer: E. The advantages and benefits of rubber dam usage are reflected in all of the items stated
The rubber dam isolation increases access and visibility.
14. A casting may fail to seat on the prepared tooth due to all of the following factors except____.
a. Temporary cement still on the prepared tooth after the temporary restoration has been removed.
b. Proximal contact of casting too heavy/tight
c. Undercuts present in the prepared tooth
d.The occlusal of the prepared tooth was under-reduced
Answer: D. Occlusal reduction would not affect the stability to seata casting. However, temporary cement, heavy proximal contacts, or tooth undercuts could keep the casting from seating completely.
15. All of the following statements about slot reatained complex amalgams are true except _____.
a. Slots should be 1.5 mm in depth
b. Slots should be 1mm or more in length
c. Slots maybe segmented or continuos
d. Slots should be placed atleast 0.5mm inside the dej
Answer: A. The longer a slot the better. They should be inside the dej and prepared with an inverted cone bur to a depth of 1mm.
16. Which one of the following acids is generally recommended for etching tooth structure?
a. Maleic acid
b. Poly acrylic acid
c. phosphoric acid
d. tartaric acid
e. ethylenediaminetetraacetic acid
Answer: C. although some of the self etched bonding systems use milder acid, the primary acid system used for etching tooth structure is phosphoric acid.
17. Triturating a dental amalgam will ____?
a. reduced the size of alloy particles
b. coat the alloy particles with mercury
c. reduced the crystal sizes as they form
d. dissolve the alloy particles in mercury
Answer: B. triturating the amalgam particles with the mercury is intended to result in coating the particles with a surface of mercury and creating the desirable phases in the set amalgam. All of the alloy particle is not dissolved in the mercury, nor it the size significantly reduced.
18. In the conventional class 1 composite preparation, retention is achieved by which of the following features?
1. Occlusal convergence
2. Occlusal bevel
3. Bonding
4. Retention grooves
a. 2 and 4
b. 1 and 3
c. 1 and 4
d. 2 and 3
Answer: B. typically the class 1 composite preparation has occlusally converging walls that proved primary retention form. The actual bonding also provides retention form. However, an occlusal bevel is not indicated in class 1 preparation nor are retention grooves used.
19. Which of the following statements regarding caries risk assessment is correct?
a. Presence of restorations is a good indicator
b. Presence of restoration is a good indicator of past caries activities
c. Presence of dental plaque is a good indicator of current caries activities
d. Presence of pit and fissure sealant is a good indicator of current caries activities
Answer: B. a restored tooth indicates potential past cariuos activity but not current activity. Plaque presence does not necessarily indicate caries presence and sealants are used for preventive purposes, not caries treatment.
20. Which of the following statements about indirect pulp caps is false?
a. some leathery caries will be felt in the preparation
b. liner is generally recommended in the excavation
c. operator should wait atleast six to eight weeks before re-entry
d. the prognosis of indirect pulp cap treatment is poorer than that of direct pulp caps.
Answer: D. when a doing an indirect pulp cap some caries maybe left, a liner is usually placed over the excavated area, and the area maybe assessed 6-8 weeks later. Regardless, the indirect pulp cap prognosis is better than the prognosis for direct pulp caps.
Avanzado, Darryl R.
DMD 4BB
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