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1. A patient complains of a toothache triggered by heat and relieved by cold. The involved tooth is best treated by which of the following?

 

A. Cold application

B.  Root canal therapy

C.  Pulpotomy

D. Corticosteroids

E.  Antibiotics

 

 

B. A tooth triggered by heat indicates that a necrotic process is occurring in the pulpal chamber. The heat causes expansion of gases created by bacteria which in turn exerts pressure on the remaining vital tissue. Cold causes contraction of the gases resulting in a soothing effect. The therapy of choice for a tooth that is necrotic is n\root canal therapy.

 

 

2. The radiographic procedure of choice for use is periodontal examination is the:

 

A. Paralleling technique

B.  Bisecting technique

C.  Bite-wing

D. Pantrograph

E.  Faminograph

 

A. The paralleling technique or long cone technique gives a better representation of the bony architecture for diagnosis of periodontal disease by elimination of elongation and foreshortening.

 

 

3. One primary advantage of polycarboxylate cements is that they:

 

A. are insoluble in oral fluids

B.  have very high compressive strength

C.  cause minimal pulp irritation

D. have a long setting time

E.  are reliable inhibitors of secondary caries.

 

 

C. the high pH of polycarbozylate cements results in minimal pulpal irritations

 

4.     The  tissue on the  infrapontic surface of a  pressure ridge lap pontic is    usually:

 

A. normal

B.  painful

C.  chronically inflamed

D. plaque free

E.  highly keratinized

 

C. the tissue in the infrapontic area of ridge lap pontic is usually chronically inflamed because of the pressure from the restorative material. It is never painful and is usually full of plaque.

 

 

5. The earliest apical radiographic change seen in a pulpally involved tooth is:

 

A. Apical resorption

B.  Thinning of the famina dura

C.  Thickening of the periodontal ligament space

D. Loss of famina dura

E.  Hypercementosis

 

 

 

 

C. Space in a pulpally involved tooth is the result of bacterial products forming in the apical region and distending the periodontal ligament space

 

6. The treatment of choice for tilted teeth is:

 

A. extraction

B.  telescopic crowns

C.  full crowns

D. orthodontics

E.  endodontic and full coverage

 

 

D. the ideal treatment for tilted teeth for a prosthetic device is orthodontics. Restorative procedures utilizing telescopic crowns or full coverage don’t effectively rid the area of food entrapment and plaque formation.

   

 

7. What is the role of pins in restoring a large amount of lost tooth structure in a molar tooth” they are:

 

A. Used to reinforce the restorative material.

B.  Used to reduce the setting of the amalgam

C.  Used to retain the amalgam in the cavity preparation

D. Used only in teeth to be crowned.

E.  To be used only as temporary restoration.

 

C. The grooves on the pins used for restoring a large amount of lost tooth structure are designed to retain amalgam in the cavity preparation.

 

 

8. Which of the following types of base materials must not be placed is contact with polymethyl methacrylate?

 

A. Zinc phosphate cement

B.  Calcium hydroxide

C.  Zinc oxide eugenol cements

D. Germicidal cements

 

 

C. Cements containing an essential oil such as eugenol will attack methyl methacrylate crowns and temporaries and inhibit the polymerization of the resin. The material will remain soft.

 

 

9. Retention of an amalgam restoration is established by:

 

A. Sharp line and point angles

B.  Dentin elasticity

C.  Undercut preparation         D. none of the above

 

C. Undercutting an alloy preparation in the proximal flare in the dentin without undermining enamel is partly responsible for the retention of the restoration.

 

10. Extending a proximal restoration into the embrasure area:

 

A. Improve esthetics

B.  Decreases thermal sensitivity

C.  Decreases the possibility of recurrent decay

D. All of the above

E.  None of the above

 

 

C. Extension of proximal restoration into the embrasures space decreases the possibility of recurrent caries in that area because it is covered by a restorative that should extend into clean areas labially, buccally, lingually, ang gingivally.

 

 

11. Splinting around the arch will resist:

 

A. Mesiodistal forces only

B.  Buccolingual forces

C.  Multidirectional occlusal forces

D. Tilting forces only

 

C. Splinting around the arch or across arch splinting resists multidirectional occlusal forces. Splinting w/in the same quadrant or arch only will resolve forces that exist in  one plane, whereas splinting around the arch will proctect the tooth against all forces, mesial, distal, buccal, lingual, and occlusal. Increased stability is gained from going around the curve of the arch.

 

 

 

 

 

 

 

 

12. The major function of the cement in an inlay is:

 

A. Retention                           D. All of the above

B.  Sealing                               E. None of the above

C.  Insulation

 

B. The primary function of cement under an inlay is sealing. The inlay should primarily be retained by the parallelism of the preparation and the frictional retention of the casting to the preparation.

 

13. An overhang on a proximal restoration will most likely lead to:

 

A. Recurrent decay                          C. Loss of the restoration

B.  Plaque retention                          D. All of the above

 

 

D. An overhanging margin on a proximal restoration can result in a sequelae of circumstances starting with plaque retention. Recurrent decay, and finally the loss of the restoration and possibly tooth vitality.

 

14.  Undercuts in an inlay preparation:

 

A. May be blocked out on the model

B.  May prevent seating of the inlay

C.  Should be removed if possible.

D. All of the above                                 

E.  None of the above

 

 

D. Undercuts, if minor, may be blocked out on the model of the inlay preparation. Undercuts in an inlay preparation itself will usually prevent the restoration from seating in the mouth, and if it should there is usually a marginal discrepancy.

 

15. The ultraviolet cured restorative materials:

 

A. Bond to the teeth chemically

B.  Bond to the teeth mechanically

C.  Combine chemical and mechanical bonding

D. None of the above

 

 

B. Teeth are acid etched in order to have the restorative material mechanically hold to the microscopic retentive areas in the enamel surface. Acid etching increase the area and surface roughness of enamel for retention and ultraviolet cures this type of restorative.

 

16. Bite-wiring radiographs are most useful for diagnosing:

 

A. Pulpal involvement

B.  Pulp stones

C.  Proximal caries

D. Periodontal abscess

 

 

 

C. Bite-wiring x-rays are of primary importance in diagnosing interproximal caries because the film is placed parallel to the crowns of the teeth and x-ray beam is perpendicular to the film. This permits visibility of the proximal contacting surfaces of bicuspids and molars w/o distortion and overlap.

 

17. When placing a proximal amalgam restoration

 

A. The matrix band should be wedged at the gingival margin

B.  The matrix band need not be wedged at the gingival margin

C.  Wedging of the matrix band can cause an open contact

D. None of the above

 

 

 

A. When placing a proximal amalgam restoration the matrix band should be wedged at the gingival margin in order to hold the matrix material close to the tooth being restored and to provide enough separation to compensate for the thickness of the matrix material.

 

 

 

 

 

18. Which of the following is the proper amount of copper in amalgam according to the ADA specifications?

 

A. 65 percent                                   C. 6 percent

B.  25 percent                                   D. 2 percent

 

C. According to ADA specifications number 1 the proper amount of copper in a silver alloy is 6%.

 

19. A mobile tooth should be splinted to:

 

A. At least one firm tooth

B.  At least two firm teeth

C.  As many teeth as possible

D. A molar

 

B.  A mobile tooth should be splinted to at least two firm teeth because splinting to one firm tooth would cause the one firm tooth to become mobile. Splinting procedures

 

20. The ideal thickness of cement under a cast restoration is:

 

A. 40 microns                                  D. 150 microns

B.  80 microns                                  E. 200 microns

C.  100 microns

 

 

 

A. Cement under a cast restoration is primarily a sealing agent. The closer the restoration fits the preparation the less chance for the sealing agent to become solubilized in saliva.