1.Which substance acts as the cross-linking agent in polysulfide rubber-based impression materials?
2.When taking a polysulfide impression for a cast crown, why are custom trays generally favored over stock trays, except for which of the following reasons?
3.Which substance acts as the accelerator in Zinc oxide eugenol (ZOE) paste?
4.Which type of elastomeric impression material exhibits the greatest linear shrinkage over time?
5.Which statement accurately describes the properties of Agar hydrocolloid impression material?
6.Which additive enhances the strength and decreases the viscosity of agar hydrocolloid impression material?
7.What is the correct water-to-powder ratio for mixing alginate?
8.Which impression material is most suitable for taking an accurate impression following crown preparation?
9.What is the accurate glass transition temperature for impression compound?
10.What causes a rough and uneven texture on an impression surface?
11.What is the minimum flow percentage of Type-I impression compound when measured at mouth temperature?
12.Why is polysulfide material generally discouraged for routine use?
13.Which of the following is NOT a characteristic exhibited by hydrocolloid materials?
14.Which impression material does not set through a chemical reaction?
15.In the putty wash technique, what is the correct sequence of material application?
16.What should be the minimum thickness of elastomeric impression material to ensure an accurate dental impression?
17.Which instrument is used to measure the relative hardness of elastomers?
18.What causes a rough texture on an elastomeric impression surface?
19.Which elastomer exhibits the highest rigidity?
20.Which of the following materials exhibits the highest elasticity?