Abstract
Objective: To measure cumulative torque values generated during different types of motions during instrumentation by rotary files. Method: Forty extracted human premolar teeth with single canal have been utilised, instrumentation was performed with a single-file procedure with tip end no. 25 and taperness of 6% by two groups of files; Protaper Gold and Wave One Gold. Each group was subdivided into two subgroups; Group A (10 in no.) set at 2.5 N.cm2. Group B (10 in no.) set at 1 N.cm2 using an endodontic motor. A software has been used for precise torque measurements of range of 0.05 N.cm2 for every 30 seconds. Results: The t test showed a highly significant difference between groups 1A and 2A (p≤.01). Cumulative torque also showed non-significant differences by the groups 1B and 2B, (p≥.05) (Table 2). Conclusion: At high torque setting, the preparation mode was affected by cumulative torque values whereas the same comparison was neutral at low torque control motor
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