Acid-etching is done for_______________?

Related Mcqs:

1. Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is_________________?

   A. 10 um – 20 um
   B. 3 um – 9 um
   C. 50 um – 110 um
   D. 200 um – 250 um

2. Most advantageous indication of acid etching is______________?

   A. Decrease micro leakage
   B. Decrease polymerization shrinkage
   C. Decrease coefficient of thermal expansion
   D. Decrease porosity in restorative material

3. When restoring a tooth with resin material, acid etching can do all of the following except______________?

   A. Increase the surface area
   B. Permit chemical bonding between resin and enamel
   C. Create surface irregularities in enamel for better mechanical retention of resin
   D. Condition the tooth surface for better wetting

4. Etching of dentin does not include_____________?

   A. Removal of smear layer
   B. Exposure of collagen fibers
   C. Opening of dentinal tubules
   D. Increases surface energy

5. Use of dimethyl-P-toluidine is indicated for_______________?

   A. Thermal polymerization of acrylic
   B. Chemical polymerization
   C. Retarding the polymerization reaction
   D. To inhibit the action of benzoyl peroxide

6. Which acid is formed in the citric acid cycle ?

   A. Oxaloacetic acid
   B. Glutamic acid
   C. Nitric acid
   D. None of the above

7. Frozen slab technique of mixing zinc phosphate is used for_______________?

   A. Cementing crowns
   B. Temporary dressing
   C. base
   D. cementing orthodontic bands

8. K2SO4 in agar-agar is for_______________?

   A. Accelerating the setting stage of gypsum
   B. Increase strength
   C. Give dimensional stability
   D. None of the above

9. Perforated impression tray are used for_______________?

   A. Alginate
   B. Zinc oxide-eugenol
   C. Agar-agar
   D. Impression compound

10. Waxes are used for_______________?

    A. Primary impression
    B. Corrective impressions
    C. Impression of single tooth
    D. None of the above