Endo instruments

Hand-operated endodontic instruments are most common manufactured of

• copper

• stanless steel

• nickel-titanium alloy

• molybdenum

The length of working (cutting) part of endodontic instrument is

• 16 mm

• 21 mm

• 25 mm

• 31 mm

Standard ISO taper of hand-operated endodontic instruments is

• 1.5 %

• 2%

• 3%

• 8%

The handle of hand file 08 is coded with

• black color

• grey color

• green color

• pink color

The diameter of the tip of the classical hand-operated instrument increases up to instrument # 60 in

• increments of 0.05 mm including instruments 06, 08 and 10

• increments of 0.05 mm except instruments 06, 08 and 10 

• increments of 0.1 mm including instruments 06, 08 and 10

• increments of 0.1 mm except instruments 06, 08 and 10

K type reamer is used with

• one full rotation and withdrawn

• 180˚rotation and withdrawn 

• 120˚ rotation and withdrawn

• exclusively watch-winding movements 

H type file

• has exceptional resistance to torsion

• is exclusively fabricated of electropolished wire

• is most safely used in watch-winding movements

• is fabricated by grinding

For the lentulo-spiral, the following statement is true

• serves for the retreatment

• due to the safety mechanism it cannot be broken in the canal

• exists only in the machine-driven version

• extreme caution is required when using

Machine driven endodontic instruments should

• introduced into the canal in a state of rotation

• any moment or position in the canal to start the rotation is acceptable

• introduced into the canal up to the working length and then started

• introduced passively into the canal, then start

What should be done with endodontic instruments that show a slight deformation of the working part?

• the deformation is corrected, and the instrument is further used

• the instrument needs to be discarded

• the working part of the instrument is shortened

• the deformation does not need to be corrected