OBTURATION TECHNIQUES

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Endodontics

1. The cause of persistence positive cultures from a root canal is most frequently the:

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A. Contaminated culture medium

B. Improper drug therapy

C . Overinstrumentation of the root canal with infected instruments

D. Seepage of saliva into the area of operation

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2. Ideal root canal filling material should:

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A. Be easily introduced into the canal

B. Be semisolid

C. Be dimensionally stable

D. All of the above

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3. Biologically active sealers which enhance the periapical healing contain:

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A. Calcium hydroxide

B. Silver-amalgam paste

C. Zinc phosphate

D. Zinc oxide-eugenol

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4. The most important requirement of an ideal root canal cement is:

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A. It should be radiolucent

B. It should not shrink more than 0.04% upon setting

C. It should make a hermetic seal

D. The particles of powder should be very soft so that they mix easily with the cement liquid

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5. Iodine in glycerine is used for:

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A. Dissolving organic debris

B. Sterilizing the rubber dam

C. Treating pericementitis to relieve the symptoms and is palliative in nature

D. None of the above

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6. The primary gutta-percha cone must fill the canal tightly in the:

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A. Apical third

B. Middle third

C. Occlusal third

D. None of the above

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7. Warm gutta-percha systems are:

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A. Calcibiotic sealants

B. 'Obtura' and 'Ultrafil'

C. Latest techniques for biomechanical preparation

D. None of the above

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8. Free eugenol in root canal sealer cements is significant because it increases:

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A. Cytotoxicity

B. Dimensional stability

C. Strength

D. Working time

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9. Solvent used along with file to remove gutta-percha is:

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A. Alcohol 1 0%

B. Chloroform

C. Formalin

D. Sodium hypochlorite 5%

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10. Chairside sterilization of gutta-percha points is best done by:

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A. 2% metrogyl solution

B. 5.25% solution of sodium hypochlorite

C. 10% by volume hydrogen peroxide

D. 90% alcohol

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