Hydrocolloid material, show all except______________?

Related Mcqs:

1. A technique of combining reversible and irreversible hydrocolloid that could bond to irreversible hydrocolloid is known as________________?

   A. Injecting technique
   B. Laminate technique
   C. Immersion technique
   D. Tempering technique

2. The basic constituent of reversible hydrocolloid impression material is________________?

   A. Agar
   B. Alginic acid
   C. Gelatin
   D. alginate

3. Which of the following is true about Agar hydrocolloid impression material ?

   A. Liquefies between 71 – 100°C
   B. Solidfies between 50 – 70°C
   C. Facilitates fabrication of metal dyes
   D. Cannot register fine surface details

4. Hysteresis in a hydrocolloid gel is______________?

   A. Moisture absorption
   B. Temperature lag between gelation and liquefaction temperature
   C. Phenomenon of conversion of gel into sol
   D. All of the above

5. Syneresis seen in hydrocolloid gel is______________?

   A. Seen as water loss
   B. Water absorption
   C. Shrinkage
   D. Gelation

6. Dimensional stability of hydrocolloid impressions may be achieved by_________________?

   A. Using less water powder ratio
   B. Storing the impression under water
   C. Prolonged manipulation
   D. Using humidor

7. Which one of the following increase the strength and reduce viscosity of agar hydrocolloid impression material_____________?

   A. Borax
   B. Water
   C. Sulfates
   D. Carbonates

8. In reversible hydrocolloid the property by which the transformation from sol to gel and gel to sol is a function of the_____________?

   A. Concentration of filler and plasticizer
   B. Percentage composition by weight of water
   C. Concentration of potassium sulphate
   D. Temperature

9. The best way to remove a hydrocolloid impression from the patient’s mouth is____________?

   A. Slight rocking of the impression to disengage it from the undercut
   B. Wetting the periphery of the impression with moist cotton to break the peripheral seal
   C. Sudden jerking of the impression to prevent tearing
   D. Supporting the impression along with the tray to prevent disengaging of the tray alone

10. 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