Torsional testing of Canal Master U hand instruments

Area of Science:

• Dental materials science
• Endodontic instrument biomechanics

Background:

• Endodontic instruments are crucial for root canal treatment.
• The American Dental Association (ADA) sets specifications for instrument performance.
• Canal Master U instruments are used in endodontic procedures.

Purpose of the Study:

• To evaluate the torsional failure and revolutions to failure of Canal Master U hand instruments.
• To compare the performance of Canal Master U instruments against ADA Specification No. 28.

Main Methods:

• Ten instruments of sizes 25, 30, 35, 40, and 45 were subjected to torsion testing.
• Testing was performed using an Instron 1125 machine.
• Torsional failure, revolutions to failure, and point of separation were measured.

Main Results:

• Mean torque failure values for sizes 25 and 35 exceeded ADA minimums; sizes 30, 40, and 45 were below.
• All Canal Master U instruments exceeded ADA minimums for revolutions to failure.
• Five size 25 instruments failed below ADA specifications due to a wide range of values.

Conclusions:

• Canal Master U instruments exhibit variable performance concerning ADA torque specifications.
• A need exists for a separate ADA specification category for Canal Master U instruments due to design differences.
• Further research into endodontic instrument standardization is warranted.