Instruments and Instrumentation II Quiz

What is the curvature of the blade used for conservative cutting procedures?

• Curved

• Straight

• Left

• Right

Which type of bur is known for removal of soft carious dentin?

• Ultrasonic

• Air abrasion

• Rotary

• Laser

What is the main advantage of rotary tools over other types of instruments?

• More smooth cavity margin

• Cleave through inter-prismatic substance

• Longer life span

• Painless

Which type of bur has a higher Vickers Hardness Number compared to steel burs?

• None of the above

• Carbide and Carbon Steel

• Carbon Steel

• Carbide

What is the function of the face of the blade on a bur?

• Clearance Angle

• Rake Angle

• Cutting Efficiency

• Chip Space

Which factor affects the cutting efficiency of burs?

• Pressure

• Composition

• Tissue to Be Cut

• Eccentricity

What is the effect of decreasing the clearance space on burs?

• Clogging and heat generation

• Decrease friction

• Increase cutting efficiency

• Increase strength

What is the main difference between carbide and steel burs?

• Carbide burs cut both enamel and dentin

• Steel burs are effective at high speed ranges

• Steel burs are more efficient

• Carbide burs cut only enamel

What is the maximum displacement of the periphery of the working part of a bur from its central axis?

• 0 mm

• 0.0025 mm

• < 0.0025 mm

• > 0.0025 mm

What is the effect of pressure on burs?

• Increase heat generation

• Decrease cutting efficiency

• Decrease bur life

• Increase dulling tendency