Dent Exam 5

Front 1

Digitalis is prescribed for the treatment of

A. nephritis.
B. angina pectoris.
C. coronary occlusion.
D. congestive heart failure.
E. None of the above.

Back 1

D. congestive heart failure.

Front 2

Hemangiomas of the jaws

A. never occur in bone.
B. are malignant.
C. can appear cystic radiographically.
D. are metastatic lesions.

Back 2

C. can appear cystic radiographically.

Front 3

Radiographically, a primordial cyst will show

A. mixed radiolucency and radiopacity.
B. a radiolucency around the crown of an impacted tooth.
C. a radiolucency containing multiple rudimentary teeth.
D. a radiolucency.
E. None of the above.

Back 3

D. a radiolucency.

Front 4

Regardless of the target-film distance employed for intraoral surveys, the diameter of the primary beam at the patient's skin surface should not be greater than

A. the longest side of the film.
B. the size of the lead diaphragm.
C. 7cm.
D. the size of the filter.

Back 4

C. 7cm.

Front 5

A hemorrhagic bone cyst (traumatic cyst) is a radiolucency most frequently seen

A. in the mandibular ramus.
B. posteriorly to the maxillary molars.
C. from the symphysis to the ramus of the mandible.
D. in the maxillary premolar area.
E. None of the above.

Back 5

C. from the symphysis to the ramus of the mandible.

Front 6

The normal white cell differential count for neutrophils is

A. 10-19%.
B. 20-29%.
C. 30-39%.
D. 40-65%.
E. 66-90%.

Back 6

D. 40-65%.

Front 7

Acute or subacute suppurative osteomyelitis occurs most frequently in the

A. anterior maxilla.
B. posterior mandible.
C. posterior maxilla.
D. anterior mandible.

Back 7

B. posterior mandible.

Front 8

A decrease in the neutrophil count is present in

A. granulocytopenia (agranulocytosis).
B. iron deficiency anemia.
C. myeloid leukemia.
D. leukocytosis.
E. thrombocytopenic purpura.

Back 8

A. granulocytopenia (agranulocytosis).

Front 9

The characteristic colour seen in the crowns of teeth with internal resorption is due to

A. deposition of pigment in the cells of the odontoblast layer.
B. the presence of hyperplastic vascular pulp tissue.
C. a change in the consistency of the dentin.
D. an optical phenomenon related to the difference in the refractive indices of the normal and affected areas.
E. the degeneration and necrosis of the pulp tissue.

Back 9

B. the presence of hyperplastic vascular pulp tissue.

Front 10

The premolar with the occlusal groove pattern simulating the letter “Y” is the

A. maxillary first premolar.
B. mandibular first premolar.
C. maxillary second premolar.
D. mandibular second premolar.

Back 10

D. mandibular second premolar.

Front 11

Which of the following is immediately distal to the intermaxillary suture?

A. Mandibular central incisor.
B. Mandibular canine.
C. Maxillary central incisor.
D. Maxillary canine.

Back 11

C. Maxillary central incisor.

Front 12

Secondary dentin formation may be stimulated by

A. pulp necrosis.
B. fluorosis.
C. attrition.
D. vitamin D therapy.

Back 12

C. attrition.

Front 13

The pulpal floor of a Class II cavity is cut perpendicular to the long axis of the tooth EXCEPT in the

A. maxillary first premolar.
B. maxillary second premolar.
C. mandibular second premolar.
D. mandibular first premolar.

Back 13

D. mandibular first premolar.

Front 14

The primordial cyst probably results from

A. cystic degeneration of the stellate reticulum early in the formation of the tooth.
B. epithelial remnants in the periodontal ligament.
C. an extension of pulpal inflammation after death of the pulp.
D. failure of formation of the enamel matrix.
E. the dental lamina.

Back 14

A. cystic degeneration of the stellate reticulum early in the formation of the tooth.

Front 15

Gutta-percha may be softened or dissolved within the root canal by using

A. alcohol.
B. ethyl chloride.
C. eugenol.
D. xylene.

Back 15

D. xylene.

Front 16

Hyperemia of the pulp is

A. an acute inflammation of the dental pulp characterized by intermittent paroxysms of pain which may become continuous.
B. an excessive accumulation of blood in the pulp resulting in vascular congestion.
C. a chronic situation whereby minute arterioles of pulpal tissue are engorged for long periods creating temporary episodes of pain.
D. a transient invasion of bacterial elements into the outer lying stroma of the pulpal tissue.

Back 16

B. an excessive accumulation of blood in the pulp resulting in vascular congestion.

Front 17

Following the removal of a vital pulp, a root canal is medicated and sealed. The patient returns with an acute periradicular periodontitis. The most probable cause is

A. overinstrumentation.
B. lateral perforation.
C. incorrect medication.
D. pulp tissue left in the root canal.
E. infection.

Back 17

A. overinstrumentation.

Front 18

The material of choice for obturating the root canal system of a primary tooth is

A. silver cone.
B. gutta percha.
C. zinc-oxide eugenol.
D. paper point medicated with formocresol.
E. zinc oxyphosphate.

Back 18

C. zinc-oxide eugenol.

Front 19

A carious maxillary central incisor with acute suppurative pulpitis requires

A. immediate endodontics and apicectomy.
B. incision and drainage.
C. opening of the canal and drainage for one week.
D. pulpotomy.

Back 19

C. opening of the canal and drainage for one week.

Front 20

After performing an apicoectomy, which of the following should be placed in the bony defect prior to suturing the flap?

A. Corticosteroids.
B. Antibiotic powder.
C. Oxidized cellulose.
D. Bone wax.
E. Nothing.

Back 20

E. Nothing.

Front 21

When closing a diastema with direct composite, care must be taken to ensure that

A. only supragingival enamel is etched.
B. primer is used to increase bond strength.
C. glass-ionomer cement is used subgingivally.
D. interproximal gingiva is adequately retracted.

Back 21

D. interproximal gingiva is adequately retracted. - Black triangles

Front 22

The need to frequently replace intact orthodontic elastics is a direct consequence of

A. creep.
B. low modulus.
C. stress relaxation.
D. high ductility.

Back 22

C. stress relaxation.

Front 23

Which of the following statements is correct with respect to root caries lesions?

A. A specific microoganism causes root caries.
B. Early lesions involve adjacent enamel.
C. Colour of the lesion is a relaible indicator of caries activity.
D. The majority of lesions begin interpoximally.

Back 23

A. A specific microoganism causes root caries.
- Strep mutans or A. visc

Front 24

To achieve adequate retention when placing a post in a posterior tooth with a normal canal configuration, the post requires a

A. length of 7 to 8 mm.
B. length equal to the restored crown height.
C. parallel sided design.
D. resin luting cement.

Back 24

A. length of 7 to 8 mm.

Front 25

830. A fixed partial denture with a single pontic is deflected a certain amount, a span of two similar pontics will deflect

A. the same amount.
B. twice as much.
C. four times as much.
D. eight times as much.

Back 25

D. eight times as much. L^3

Front 26

A cement base under an amalgam restoration should have

A. high modulus and high thermal diffusivity.
B. high modulus and low thermal diffusivity.
C. low modulus and high thermal diffusivity.
D. low modulus and low thermal diffusivity.

Back 26

B. high modulus and low thermal diffusivity.

Front 27

Decreasing the amount of network modifiers in a dental porcelain will

A. decrease its fusion temperature.
B. increase its thermal expansion .
C. decrease its chemical reactivity.
D. increase its potential for devitrification upon heating.

Back 27

B. increase its thermal expansion .

Front 28

For a ceramometal crown, the thermal expansion coefficient of the ceramic (porcelain) should be

A. slightly lower than that of the underlying metal structure.
B. equal to that of the underlying metal structure .
C. slightly higher than that of the underlying metal stucture.
D. significantly higher than that of the underlying metal structure.

Back 28

A. slightly lower than that of the underlying metal structure.

Front 29

All of the following are strategies for increasing the fracture toughness of dental ceramics EXCEPT

A. slow cooling after sintering.
B. tetragonal zirconia addition.
C. self-glazing.
D. crystalline phase dispersion.

Back 29

A. slow cooling after sintering. -Rapid hardens

Front 30

Increasing the crystalline content of a dental ceramic will generally decrease its

A. fracture toughness.
B. opacity.
C. translucency.
D. proportional limit

Back 30

C. translucency.

Front 31

Generalized aggressive periodontitis is characterized by attachment loss affecting the first molars and incisors and at least

A. 1 other permanent tooth.
B. 3 other permanent teeth.
C. 5 other permanent teeth.
D. 7 other permanent teeth.

Back 31

B. 3 other permanent teeth.

Front 32

Two important wound healing principles for guided tissue regeneration are

A. space creation and wound stabilization.
B. space creation and intramarrow penetration.
C. root surface biomodification and wound stabilization.
D. root surface biomodification and intramarrow penetration.

Back 32

A. space creation and wound stabilization.

Front 33

According to functional matrix theory of growth, primary sites

A. cause expansion and growth.
B. respond by compensation to translational forces.
C. are the primary genetic basis for all growth and development.
D. in addition to the bony skull are the major influences of growth.

Back 33

A. cause expansion and growth.

Front 34

When performing a periodontal screening and recording (PSR) for a patient, the code asterisk (*) is used for a sextant when

A. a tooth in the sextant needs to be extracted.
B. all the teeth in the sextant are missing.
C. a mucogingival problem is present.
D. a tooth in the sextant has supraerupted.

Back 34

C. a mucogingival problem is present.

Front 35

Which of the following maxillary incisor angulations complicates a functional appliance construction bite?

A. Retroclined central incisors.
B. Proclined lateral incisors.
C. Retroclined lateral incisors.
D. Proclined central incisors.

Back 35

A. Retroclined central incisors.

Front 36

An ideal occlusion has

A. an absence of contact on cingulums during protrusion.
B. canine guidance or group function on the working side.
C. contact between posterior teeth during protrusion.
D. posterior tooth contact on the non-working side.

Back 36

B. canine guidance or group function on the working side.

Front 37

When using a semi-adjustable articulator, the most significant effect on the occlusal anatomy of a restoration arises from alteration of the

A. immediate side shift.
B. intercondylar width.
C. level of the Frankfort plane.
D. position of the incisal pin.
E. posterior wall of the fossae.

Back 37

D. position of the incisal pin.

Front 38

A modified hinge non-adjustable articulator is limited in its accuracy to reproduce dynamic jaw movements because it can only reproduce

A. large centric relation- maximum intercuspation slides.
B. one hinge axis movement.
C. one specific intercuspal position.
D. eccentric movements by multiple lateroprotrusive registrations.

Back 38

B. one hinge axis movement.

Front 39

The incidence of a second mesiobuccal canal in the maxillary first molar is

A. 40%
B. 60%.
C. 80%.
D. 100%.

Back 39

A. 40%

Front 40

In the mandible, the main growth site is in the

A. gonial angle.
B. condylar cartilage.
C. posterior border of the ramus.
D. inferior and lateral aspects of the body of the mandible.

Back 40

B. condylar cartilage.

Front 41

Which of the following is the most potent corticosteroid?

A. Cortisone.
B. Dexamethasone.
C. Hydrocortisone.
D. Prednisone.
E. Triamcinolone.

Back 41

B. Dexamethasone.

Front 42

When placing an implant in the posterior mandible, the minimum thickness of bone between the implant and the inferior alveolar nerve should be

A. 2mm.
B. 4mm.
C. 6mm.
D. 8mm.

Back 42

A. 2mm.

Front 43

Side effects of therapeutic doses of codeine can include

1. constipation.
2. drowsiness.
3. nausea.
4. respiratory depression.

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

Back 43

E. All of the above.

Front 44

In a developing crown, ameloblasts and odontoblasts

A. are polarized in opposite directions.
B. initially produce an organic nonmineralized matrix.
C. begin to produce matrix simultaneously.
D. have rapid cell division.

Back 44

B. initially produce an organic nonmineralized matrix.

Front 45

A 3 year old has been diagnosed with an inverted mesiodens. What is the most appropriate time to extract the mesiodens?

A. Immediately.
B. Just prior to the eruption of the first permanent molars.
C. Just prior to the eruption of the maxillary central incisors.
D. Just prior to the eruption of the maxillary canines.

Back 45

C. Just prior to the eruption of the maxillary central incisors.

Front 46

Voids in a gypsum cast are most likely the result of

A. high surface tension of a silicone impression material.
B. high surface tension of an irreversible hydrocolloid.
C. using a hydrophilized addition silicone.
D. spraying a surfactant on the impression.

Back 46

A. high surface tension of a silicone impression material.

Front 47

Increasing the amount of network modifiers (e.g. CaO, Na2O) in porcelain will

A. increase its fusion temperature.
B. decrease its thermal expansion.
C. increase its chemical reactivity.
D. decrease its potential for devitrification upon heating.

Back 47

B. decrease its thermal expansion.

Front 48

What is the most significant radiographic finding in hyperparathyroidism?

A. Demineralization of teeth.
B. Multiple odontogenic keratocysts.
C. Hypercementosis.
D. Rampant caries.
E. Generalized loss of lamina dura.

Back 48

E. Generalized loss of lamina dura.

Front 49

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 electric pulp tester. There is some mobility. The most likely diagnosis is

A. acute periradicular abscess.
B. acute serous pulpitis.
C. lateral periodontal abscess.
D. acute suppurative pulpitis.
E. chronic ulcerative pulpitis.

Back 49

C. lateral periodontal abscess.

Front 50

Which of the following structures may be associated with the role of the central nervous system in sleep (nocturnal) bruxism?

A. Basal ganglia (nigrostriatal).
B. A delta and C nerves.
C. Sphenopalatine ganglion.
D. Petrous nerves.

Back 50

A. Basal ganglia (nigrostriatal).