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42 Cards in this Set

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Following trauma, bluish-grey discoloration of the crown is due to:

a. external resorption
b. pulpal hemorrhage
c. discolored composite restoration
d. chromogenic bacteria
B. PULPAL HEMORRHAGE
Which of the following is LEAST likely to cause pain?

a. carious pulp exposure
b. chronic hyperplastic pulpitis
c. acute pulpitis
d. apical periodontitis
B. CHRONIC HYPERPLASTIC PULPITIS
A patient experiences pain and some gingival swelling in the anterior segment of the mandible. The mandibular lateral incisor has a shallow restoration, is tender to percussion and gives a positive response to the EPT. There is some mobility. The most likely diagnosis is:
a. acute apical abcess
b. acute serous pulpitis
c. lateral periodontal abcess
d. acute suppurative pulpitis
e. chronic ulcerative pulpitis
Which one of the following statements is true as defined in endodontics?

a. Overfilling refers to the incomplete filling of the canal system with a surplus of material extruding beyond the apical foramen
b. Underfilling refers to the complete filling of the canal space, but leaving voids in the pulp chamber for possible recontamination or infection
c. Overextension refers to the extrusion of filling material through an accessory canal
d. underextension refers to the vertical extent of the filling material regardless of its completeness of obturation
e. all of the above
C
After completion of endodontic chemomechanical debridgement you can expect to have:

1. removed all tissue from the entire root canal system
2. machined the canals to a microscopically smooth channel
3. caused some temporary inflammation
4. sterilized the root canal
5. left some of areas of the root canal system incompletely cleaned

A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above
A
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
ANSWER: ETHYLENE OXIDE (chemical sterilization)

- Steam autoclave = 250 - 275 F
- Oven-type = 320 F for 1-2 hr
- Rapid Heat Transfer Dry Hear = 375 F for 6 - 20 min
- Alcohol autoclave = 273F for 20 min
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 danger of sensitizing patients to antibiotics

A. 1 3 4
B 2 4 5
C 1 2 3
D 2 and 5
E all of the above
1 3 4
The antibiotic of choice for infections of pulpal origin is:

A. Pen V
B. lincomycin
C. erythromycin
D. tetracycline
A. Pen V
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
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
A patient telephones and tells you he has just knocked out his front tooth but that it is still intact. Your instruction 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
MILK, IMMEDIATELY
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 mandibular first molar
D. mesial of a mandibular first molar
NA
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

A. (1)(2)(3)
B. (1) and (3)
C (2) and (4)
D. (4) only
E. All of the above
E
In permanent teeth, two pulp canals are most commonly found in the

A. distobuccal root of maxillary molars
B. distal root of mandibular first molars
C. palatal root of maxillary first premolars
D. mesial root of mandibular first molars
NA
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
NA
In determining the ideal proximal outline form for a Class II amalgam cavity preparation in the molar the

1. axial wall should be 1.5 mm 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

A. (1)(2)(3)
B. (1) and (3)
C (2) and (4)
D. (4) only
E. All of the above
NA
A rubber dam should be used in

A. Pulp capping procedure
B. amalgam placement
C. composite placement
D. removing carious dentin from deep lesions
E. all of the above
ALL OF THE ABOVE
The air-water spray used as a coolant in high speed cutting of a cavity will

1. decrease pulp damage
2. reduce frictional heat
3. keep the operating site clean
4. reduce clogging of cutting instruments

A. (1)(2)(3)
B. (1) and (3)
C (2) and (4)
D. (4) only
E. All of the above
ALL OF THE ABOVE
Which of the following may affect the results of electric pulp testing?

A. emotional factors
B. pain threshold
C. analgesics
D. recent trauma
E. all of the above
ALL OF THE ABOVE
Which of the following statements is/are true?

1. Radiographs cannot differentiate between infected and non-infected periapical lesions
2. A definitive diagnosis of an apical lesion cannot be made on a radiography alone
3. Periapical radiolucencies are not always indicative of loss of pulp vitality
4. A periapical radiograph can be used to locate the buccal bone level

A. (1)(2)(3)
B. (1) and (3)
C (2) and (4)
D. (4) only
E. All of the above
1 2 3
A positive and prolonged reaction to heat stimulus indicates that the pulp is

A. necrotic
B. in an early hyperemic state
C. normal
D. irreversibly damaged
D. irreversibly damaged
Which of the following is/are associated with the presence of microorganisms in the bloodstream?

A. Anachoresis
B. Cavernous sinus thrombosis
C. Bacteremia
All of the above

Anachoresis - bacteria from bloodstream enters into pulp chamber
Bacteremia -
Cavernous sinus thrombosis - formation of blood clot in cavernous sinus usually due to infection
Which of the following is /are true regarding a tooth filled with formaldehyde- containing paste?

A. Formaldehyde-containing pastes remain non-approved
B. The drug manufacturer may be liable
C. Formaldehyde-containing pastes have a high antigenic potential
D. There are cases on record of paresthesia following overextrusion of such a paste in the vicinity of the mandibular nerve
E. All of the above
NA
The desired termination point of apical root canal preparation when performing endodontic treatment on a vital tooth is

A. 0.5 to 0.1 mm short of the radiographic apex
B. 3mm short of the radiographic apex
C. slightly through the apical foramen
D. to the point where the patient feels sensation
A 0.5 to 1.0 mm short of the rad. apex
A 0.5 to 1.0 mm short of the rad. apex
Which one of the following is the initial treatment for internal resorption

A. pulpectomy
B. pulpotomy
C. Pulp capping
D. apicoectomy
Pulpectomy
The proposed mechanism by which a calcium hydroxide preparation initiates secondary dentin formation in direct pulp cappings is by

A. releasing calcium ions
B. stimulating differentiated ameloblasts to lay down dentin
C. stimulating fibroblasts to elaborate nuclei of first order
D. stimulated undifferentiated cells of the tissue to differentiate into odontoblasts
D
Calcium ions that form the dentine layer are derived entirely from where?
bloodstream
What is the most important part of the calcium hydroxide chemical?
Hydroxyl group
Which of the following are true statements about incision and drainage of an acute apical abscess?

1. A rubber dam drain may be placed
and sutured to assist drainage.
2. The procedure is only indicated with
a localized, fluctuant swelling.
3. Profound anesthesia of the surgical
site is not always possible.
4. Relief of the pressure and pain is
immediate after treatment.

A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.
E
Root canal therapy may be safely and successfully undertaken for

1. hemophiliacs.
2. patients with a history of rheumatic
fever.
3. patients with rheumatoid arthritis.
4. cerebral palsy patients.
5. adolescent diabetics.

A. (2) (3) (4)
B. (2) (3) (5)
C. (1) (2) (3) (5)
D. All of the above.
E. None of the above.
D
Which of the following conditions would NOT require antibiotic premedication before endodontic therapy

A. Valvular heart disease.
B. Cardiac prosthesis.
C. Persistent odontogenic fistula.
D. Immuno-suppressive therapy.
E. Organ transplant.
C
Metallic salts are included in root canal sealers to make the sealers

A. set more firmly.
B. be radiopaque.
C. set more rapidly.
D. be tolerated by periapical tissues.
BE RADIOPAQUE
The mechanical objectives of preparing the root canal system for obturation with gutta-percha should include

A. development of a continuously
tapering cone in the root canal.
B. removal of irregularities.
C. maintenance of an intact foramen.
D. All of the above.
ALL OF THE ABOVE
Which of the following microorganisms are most frequently found in infected root canals?

A. Streptococcus viridans.
B. Staphylococcus aureus.
C. Lactobacilli.
D. Enterococci.
E. Staphylococcus albus.
ENTEROCOCCI
What clinical evidence would support a diagnosis of acute dento-alveolar abscess?

1. A negative reaction to the electric
vitality tester.
2. A positive reaction of short duration
to cold.
3. A positive reaction to percussion.
4. Presence of a draining fistula.

A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.
B. 1 and 3
Severe throbbing tooth pain which increases when the patient lies down is a symptom of

A. a pulp polyp (chronic hyperplastic
pulpitis).
B. late stage of acute pulpitis (acute
suppurative pulpitis).
C. chronic pulpitis (chronic ulcerative
pulpitis).
D. chronic apical abscess.
E. pulp hyperemia.
B. late stage of acute pulpitis
Which of the following tests is most useful in differentiating between an acute apical abscess and an acute periodontal abscess?

A. Palpation.
B. Radiography.
C. Percussion.
D. Pulp vitality.
PULP VITALITY
The cell of the dental pulp most capable of transforming into other cells is the

A. fibroblast.
B. undifferentiated mesenchymal cell.
C. odontoblast.
D. histiocyte.
UNDIFFERENTIATE MESENCHYMAL CELL
In composite resin restorations, polycarboxylate cements are used as a base because they are

A. sedative to a hyperemic pulp.
B. neutral in colour.
C. biocompatible.
D. None of the above.
BIOCOMPATIBLE
Sterilization of carious dentin without pulp injury is assured by the application of

A. phenol.
B. 70% ethyl alcohol.
C. chlorhexidine.
D. absolute alcohol.
E. None of the above.
NONE OF THE ABOVE

Cannot sterilize carious dentine
A lingual approach for a conservative Class III preparation for a composite resin requires

A. a retentive internal form.
B. parallelism of the incisal and gingival
walls.
C. maintenance of the incisal contact
area.
D. All of the above.
maintenance of incisal contact area
Which of the following statements are true concerning the adult mandible?

1. The mandibular foramen lies in the
centre of the mandibular ramus both
in the vertical and horizontal planes.
2. The angle formed by the junction of
the ramus and the body of the
mandible is an acute one.
3. The genial tubercles are attachments
for the anterior bellies of the digastric
muscles.
4. The temporalis muscle attaches to the
lateral surface of the coronoid
process.

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