A. Remove excess impression material
B. Remove saliva
C. Hydrate the impression
D. Accelerate the setting
Related Mcqs:
- 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 - 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 - Best impression material to be used for securing impression after crown preparation_______________?
A. Alginate
B. Agar
C. Elastome
D. Zno paste - 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 - One of the most important advantages of truly elastic impression material would be its capacity for______________?
A. Close adaptation to soft tissues
B. With drawl without permanent distortion
C. Reproduction of surface details
D. Compatibility with gypsum products - Tear strength for impression material is highest for__________?
A. Condensation silicone
B. Alginate
C. Polysulfide
D. Addition silicone - Which of the following is not true about elastomeric impression ?
A. Single mix material have higher viscosity
B. Shear thinning is related to viscosity of non phase impression material
C. Improper mixing of material can cause permanent deformation of impression
D. Putty – wash technique of impression reduces dimensional change of setting - Which of the following component acts as an accelerator in ZOE impression paste ?
A. Zinc Sulphate & Zinc chloride
B. Zinc chloride & Eugenol
C. Zinc Sulphate & Eugenol
D. Glycerin - 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 - All of the following statements about an alginate impression are EXCEPT________________?
A. It should be rapidly displaced from the mouth
B. It may exhibit fluid exudates on the surface as a result of imbibition of water
C. It will take up water and expand if kept wet
D. It will shrink as a result of syneresis
