Palatal secretions affect the setting of all the impression materials except_______________?

Related Mcqs:

1. Agar impression materials differ from alginate impression materials in that the former sets by_______________?

   A. Mechanical action of saliva
   B. Physical change
   C. Evolution
   D. Chemical change

2. Which of the following impression materials is easy to pour and difficult to remove the stone cast from the impression ?

   A. Addition polysilicone
   B. Condensation polysilicone
   C. Polyether
   D. Polysulfide

3. All of the following statements about Type II silicon impression material are true EXCEPT_______________?

   A. They evolve hydrogen when cast if they are not fully cured
   B. They exhibit a very low setting shrinkage
   C. They have a lower tear resistance than polysulphide rubbers
   D. They set by condensation polymerisation

4. Impression compound is characterized by all of the following except_______________?

   A. Warps at room temperature
   B. Is a thermoset material
   C. Shows increased flow when kneaded with water
   D. Low coefficient of thermal conductivity

5. When making a polysulphide impression for a caste crown, custom trays are usually preferred over stock trays for all of the following reasons except_______________?

   A. Custom trays facilitate uniform contraction of impression material
   B. Custom trays require less impression material
   C. Stock trays may be short in the flange area
   D. Impressions made n the custom trays are easier to remove from the mouth

6. Alginate impression material is similar to Agar-agar impression material in the following respect________________?

   A. Gelation increase in both on increase in temperature
   B. Mixing time is increased to reduce the setting time
   C. Deformation during removal of impression occurs due to distortion of gel fibers
   D. Both can be re-used for fresh impressions

7. Best impression material to be used for securing impression after crown preparation_______________?

   A. Alginate
   B. Agar
   C. Elastome
   D. Zno paste

8. All of the following can be used to slow down the setting of Zinc oxide eugenol impression paste EXCEPT_________________?

   A. Adding a small amount of glycerine
   B. Adding a small amount of water
   C. Altering the amounts of the two pastes used
   D. Cooling mixing slab

9. During setting of alginate impression materials________________?

   A. Trisodium phosphate reacts with sodium alginate
   B. Trisodium phosphate reacts with calcium sulphate
   C. Colloidal changes to sol
   D. Material in contact with soft tissues sets last

10. The palatal muscle that ends in a tendon that hooks around the hamulus and is inserted in the palate is the_________________?

    A. Palatoglossus
    B. Tensor veli palatini
    C. Levator veli palatini
    D. Palatopharyngeus