# 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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