Triangular instruments while cutting canals will have to rotate how much to complete one turn?

# Triangular instruments while cutting canals will have to rotate _______ to complete one turn.

A. ¼ turn

B. ½ turn

C. 1/3 turn

D. Full turn

The correct answer is C. 1/3 turn.

The triangular shaft requires a one-third (120 degrees) rotation of the instrument to complete a cutting circle of the root. For cutting action in a canal, a traingular shaft instrument requires 1/3 turn. These cutting points are at 120 degrees to each other and they move simultaneously. So, a 1/3 turn or 120 degree turn will bring about a complete cuttting circle.

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