Dental Materials and Equipments (Practice w Images)

41. The device (shown in figure) is:

• A. Instrument washer

• B. Handpiece autoclave

• C. Handpiece washer and oiler

• D. Handpiece oiler

42. Label (1) in the figure is:

• A. Water line

• B. Exhaust line

• C. Fiber optic cable

• D. Air line

43. The gear ratio of the handpiece in the figure is:

• A. 1:5

• B. 4:20

• C. 20:4

• D. 5:1

44. According to ISO bur classification, code 805 in the figure refers to:

• A. Bur material

• B. Handpiece type

• C. Bur shape

• D. Bur diameter

45. The angle of this handpiece is:

• A. 22.5°

• B. 45°

• C. 350°

• D. 25°

46. The shank diameter of a straight handpiece bur is:

• A. 3.4 mm

• B. 2.35 mm

• C. 2.1 mm

• D. 1.6 mm

47. Coarse-grit diamond burs have particle size of:

• A. 120 μm

• B. 160 μm

• C. 180 μm

• D. 140 μm

48. When the bur is as shown in the figure, it will produce:

• A. Concentricity

• B. Vibration

• C. Run-out

• D. Cutting efficiency

50. This bur is used with handpieces at a speed of:

• A. 300,000 rpm

• B. 350,000 rpm

• C. 400,000 rpm

• D. 250,000 rpm

101. Label (4) in the figure is:

• A. Water inlet knob

• B. Water outlet knob

• C. Model platform adjusting knob

• D. Model platform