Dental Technician Questions and Answers

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Dental Lab Technician question paper for the written examination is given below. Candidates who are looking for Dental Laboratory Technician exam model question paper can find in this section. Previous Papers for Dental Lab Technician.

Model Questions and Answers on Dental Technician

1. Role of gum dammar in Inlay casting wax is
A) To improve cracking resistance
B) To provide strength to wax
C) To impact smoothness to the pattern
D) All of the above

2. Fluoride rich materials include?
A) Silicate cement
B) Glass ionomer cement
C) Polycarboxylate cement
D) All of the above

3. Glass ionomer cements are composed of:
A) Alumino silicate powder and phosphoric acid
B) Aluminosillicate powder and polyacrylate
C) Zinc oxide powder and phosphoric acid
D) Zinc oxide powder and polyacrylate liquid

4. Which one of the following dental cement accelerates the formation of reparative dentin?
A) Eugenol
B) Calcium Hydroxide
C) Zinc oxide
D) Silica

5. Minimum thickness for type I zinc phosphate cement should be:
A) 15 microns
B) 25 microns
C) 50 microns
D) 100 microns

6. Which of the following is common to both zinc eugenol cement and polycarboxylate cement?
A) Polyacrylic acid is liquid
B) Chemical bond to tooth structure
C) Chelation
D) Substitution o eugenol by EBA to increase strength of cement:

7. Increased amount of powder in zinc phosphate cement mixture will cause:
A) Decreased strength
B) Decreased film thickness
C) Decreased solubility
D) Increased setting time

8. The addition of which of the following can accelerate the setting time of zinc oxide cement:
A) Zinc acetate
B) Barium sulphate
C) Zinc sulphate
D) Barium chloride

9. Which of the following show chemicalbond with enamel (Calcified tissues)
A) Composites
B) Direct filling resins
C) Polycarboxylate cements
D) BIS-GMA resins in pit and fissure sealants

10. Which of the following cements is most irritant to pulpal tissues?
A) Zinc phosphate
B) Silicate
C) Glass ionomer
D) Polycarboxylate

11. Which of the following do polycarboxylate and GIC have in common?
A) Polysiloxane
B) Phosphoric acid
C) Polyacrylic acid
D) Ion leachable glass

12. PH of polycarboxylate liquid is:
A) 5
B) 7
C) 8
D) 1.7′

13. When selection the colour of cement to use for cementing a porcelain jacketlcrown, the powder being tested is best mixed with:
A) Glycerin-water solution
B) Cement liquid
C) Alcohol
D) Only water

14. Eugenol may be replaced in the zinc oxide eugenol cement by:
A) Acetic acid
B) Alginic acid
C) Phosphoric acid
D) Ortho-ethoxy acid

15. Thermal conductivity of which material is close to dentin:
A) Amalgam
B) Silicate
C) Composite resin
D) Cavity varnish

16. pH of fully set zinc phosphate:
A) 3-4
B) 4-5
C) 6-7
D) 7-8

17. The logical explanation for the unique anticariogenic property of most silicate cements is:
A) The reduction in enamel solubility due to fluoride uptake by enamel
B) That beryllium flux is used in silicates
C) That silicates show very little leakage at the margins of the restoration
D) Due to the high silica content

18. Thickness of luting cement is:
A) 20-40 μ
B) 10-20 μ
C) 60-80 μ
D) 1-2 μ

19. 4th state of matter is:
A) Solid
B) Liquid
C) Gas
D) Colloid

20. The base paste of the condensation poly sillicone has a low molecular weight dimethyl siloxane with a terminal-group
A) Marcaptan group
B) Hydroxyl group
C) Silane group
D) Virryl group

21. The impression with the least dimensional change upon disinfection is
A) Addition poly silicone
B) Agar-agar
C) Polysulphide
D) Polyether

22. Best material ‘for duplicating cast is:
A) Agar-agar
B) Alginate
C) Zinc oxide eugenol
D) Plaster of paris

23. Palladium is added to polyvinyl siloxane to:
A) Act as a scavenger
B) Helps as surfactant
C) Acts as plasticizer
D) Acts as a catalyst

24. Syneresis seen in hydrocolloid gel is:
A) Seen as water loss
B) Water absorption
C) Shrinkage
D) Gelation

25. impression techniques are used for recording
A) Oral mucosal tissues
B) Dental hard tissues
C) Oral mucosal tissues and dental hard tissues
D) None of the above

26. Model plaster (white) used to cast study models before mixing with water, is largely composed of:
A) CaO
B) CaCO3
C) (CaSO4)2-1/2H20
D) CaS04-2H2O

27. The product, which is obtained by calcining gypsum under steam pressure at 120-130°C or by dehydrating gypsum in the presence of sodium succinate is:
A) Alpha – hemihydrates
B) Beta – hemihydrates
C) Calcium sulphate dehydrate
D) Orthorhombic anhydrate

28. Water powder ratio of dental stone and plaster is respectively
A) 0.28 and 0.6
B) 0.6 and 0128
C) 0.6 and 3.2
D) 0.28 and 0.98

29. The tow cements which hold with the tooth are:
A) GIC and polycarboxylate
B) GIC and ZnPO4
C) ZnPO4 and silicate
D) GIC and silicate

30. The chief advantage of zinc phosphate cement is its:
A) Good compressive strength
B) Film thickness
C) Lack of irritation
D) Low solubility

31. All of the following is used as accelerator in zinc oxide eugenol cement except:
A) Acetic acid
B) Zinc acetate dehydrate
C) Calcium chloride
D) Bromoglycerine

32. Which of the following cements is most biocompatible with pulp?
B) Copper cement
C) Zinc phosphate cement
D) Zinc oxide eugenol cement

33. What is the working time of zinc polyacrylate cement?
A) 1 Minutes
B) 2 Minutes
C) 3 Minutes
D) 4 Minutes

34. The major component of zinc phosphate cement is
A) Zinc oxide
B) Phosphoric acid
C) Zinc
D) None of the above

35. Which of the following cements is most kind to pulp?
A) Glass ionomer
B) Polycarboxylate
C) Silicate
D) Resin cement

36. Polycarboxylate cement is used for:
A) Temporary restoration
B) Leuting
C) Permanent restoration
D) Die material

37. Silicate cement is indicated in:
A) Mouth breathers
B) Patients with high caries index
C) In the restoration of posterior tooth
D) None of the above

38. The dual cure cements should not be used with light transmitting prostheses thicker than:
A) 1.0 mm
B) 1.5 mm
C) 2.0 mm
D) 2.5 mm

39. The cement Which is least soluble in oral cavity:
A) Glass ionomer
B) Resin cement
C) Polycarboxylate cement
D) Silico-Phosphate cement

40. What are snap on dentures?
A) denture over implants
B) Partial denture
C) Fixed partial denture
D) complete denture

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