[ أسنان ] : الله يعافيكم ضروووري مستوى خامس

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السلام عليكم ورحمه الله وبركاته




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Endodontics

1. A useful chelating agent is -------------------------------.
a. Sodium hypochlorite.
b. Ethoxybenzoic acid.
c. Ethylene di-amino tetra acetic acid (EDTA).
d. Hydrogen peroxide.
2. Technique of displacing gutta-percha cones against the root canal
wall to provide space for additional gutta-percha cones is known as
----------------------------.
a. Addition technique.
b. Sectional condensation.
c. Lateral condensation.
d. Incremental condensation.
3. The root canal instrument most likely to break during use is -------.
a. Broach.
b. File.
c. Reamer.
d. Drill.
4. The root canal instrument manufactured from a round stainless
steel wire machined to produce spiral flutes, resembling cones or a
screw is ---------------------------.
a. K- reamer.
b. Unifile.
c. Hedstroem file.
d. K-flex file.
5. Percussion of a tooth is helpful in determining whether -------------.
a. Periodontitis exists.
b. The tooth apex has formed.

c. Pulp stones exist.
d. The tooth is vital.
6. When intense heat or cold is applied to a tooth, a normal pulp
responds by -------------------------.
a. Pain, which lasts for 1-2 minutes.
b. A feeling of hot or cold.
c. Pain, which lasts only for a short time after removal of the
stimulus.
d. No response.
7. The instrument used for lateral compaction of gutta percha is -------
-----------------------------------.
a. Finger plugger.
b. Lentulo spiral.
c. Trephine.
d. Finger spreader.
8. When doing the thermal test, the heated gutta percha is first
applied to which portion of the exposed crown --------------------.
a. Occluso-buccal third.
b. Mesio-proximal third.
c. Cervico-buccal third.
d. Anywhere on the enamel.
9. Depending on the colour code, a reamer of which of the following
colour would have the least diameter -------------------------.
a. Black.
b. Yellow.
c. Green.
d. Red.
10. Periapical surgery may be done -------------------------.
a. To remove necrotic cementum.
b. For vertically fractured teeth.

c. To treat periapical lesions clearly defined by a radiograph.
d. For biopsy.
11. EDTA --------------------.
a. Is effective in softening dentin.
b. Does not possess antimicrobial properties.
c. Cannot cause irritation.
d. All of the above.
12. Pulp testing in multirooted teeth may be misleading because -------
------------------.
a. The maxillary sinus is involved.
b. The pulp may be vital in one or two canals and necrotic in another.
c. Of the presence of enamel *****s.
d. Of the thickness of dentin.
13.What would be the shape of the access preparation of endodontic
therapy in a maxillary central incisor --------------------------.
a. Circular.
b. Triangular.
c. Oval.
d. Quadrangular.
14.Gutta percha cones can be disinfected by immersing them for 20
minutes in -------------------------.
a. Eugenol.
b. Isopropyl alcohol.
c. Acetone.
d. Chloroform.
15. The solution most preferred for irrigation of root canals is ----------
-----------.
a. Sodium hypochlorite.
b. EDTA.

c. Normal saline.
d. Glutaraldehyde.
16.Which of the following is not a contraindication for endodontic
therapy ----------------------------.
a. Presence of severe, untreatable periodontal disease.
b. Nonrestorable teeth.
c. Prophylactic pulpal therapy which may be needed for otherdiscipline
d. Extensive root resorption.
17. The safest instrument for removing the pulp from a very fine canal
is -------------------------.
a. Smooth broach.
b. Barbed broach.
c. Small K-file.
d. Small H-file.
18. False negative responses to electric pulp testing may be due to ----
-----------------------.
a. Pulp tissue undergoing degenerative changes.
b. Placement of an electrode in contact with the gingival.
c. Large amounts of reparative dentin.
d. Totally necrotic pulp tissue in a fluid state.
19.A reversible disease of the pulp is ---------------------.
a. Pulpal necrosis.
b. Acute suppurative pulpitis.
c. Chronic hyperplastic pulpitis.
d. Pulpal hyperemia.
20.When a tooth has a hyperemic pulp, which of the following is
correct --------------------------------.
a. Pain of short duration may occur.
b. Radiographs don

’t aid directly in diagnosis.

c. The condition is aggravated to cold water.
d.All of the above.
21. Function of dental pulp include all of the following except -------.
a- Support.
b- Sensory.
d- Dental repair.
e- Cementum repair.
22. Inflammation of the pulp is most often associated with ------------.
a- Trauma.
c- Occlusion.
d- Dental carries.
e- All of the above.
23. The use of transilluminator is helpful in the detection of ---------.
a. Anterior proximal caries.
b. Occlusal caries.
c. Fracture lines in anterior teeth.
d. A & C are correct.
24. AH 24 sealer cement is --------------------.
a. Zinc oxide eugenol.
b. Contains steroids.
c. Epoxy resin.
25. Erratic and inconsistent results from electric pulp testing may be
caused by ------------------------------------.
a. Saliva on tooth.
b. Secondary dentin obliterating the pulp chamber.
c.Multiple canals presenting various stages of pulp pathosis.
d.All the above.

26. Sodium hypo chlorate may be used effectively as ---------------.
a- Antimicrobial agent.
b- Tissue solvent.
c- Chelating agent.
d- Anodyne dressing.
27. A root canal sealer is usually employed to --------------------------.
a- Hermetically seal the root canal.
b- Stimulate periapical bone formation.
c- Stimulate closure of apical foramen.
d- Fill the space between hard core filler and wall of root canal.
28.What surgical procedure is indicated most frequently following
endodontic therapy on a mandibular molar having both periodontal
bifurcation involvement and extensive bifurcation caries ----------.
a- Hemi section.
b- Root amputation.
c- Apical curettage.
d- None of the above.
29.Which of the following is a useful dentine softener ----------------.
a- Oxygen peroxide.
b- Camphorated parachlorophenol.
c- Ethylenediaminetetracetic acid.
d- Hydrogen chloride

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