Ashish Medha1, Suvarna Patil2, Upendra Hoshing3, Siddhesh Bandekar4. 1. Professor, Vasantdada Patil Dental College and Hospital, Kavalapur Sangli- 416306, India . 2. Professor & Head, Vasantdada Patil Dental College and Hospital , Kavalapur, Sangli- 416306, India . 3. Professor, Vasantdada Patil Dental College and Hospital , Kavalapur, Sangli- 416306, India . 4. Student, Vasantdada Patil Dental College and Hospital , Kavalapur, Sangli- 416306, India .
Abstract
AIM: AIM of the study is to evaluate the distribution of forces on the instrument in the apical 3rd of curved canal with three Nickel Titanium rotary systems. METHODOLOGY: Three brands of instruments (ProTaper Universal; DENTSPLY Maillefer, RevoS; MicroMega and Hyflex; Coltene-Whaledent, Allstetten, Switzerland) were scanned with the Laser assisted computerized scanner to produce a real-size, 3-dimensional (3-D) model for each. The stresses on the instrument during simulated shaping of a root canal were analyzed numerically by using a 3-D finite element package, taking into account the nonlinear mechanical behavior of the nickel-titanium material. RESULTS: RevoS shows lowest values for force generation in the apical 3rd of canal as compared to Protaper which shows highest values, while Hyflex shows intermediate values for forces. CONCLUSION: With FE simulation of root canal shaping by 3 files, it was observed that different instrument designs would experience unequal degree of force generation in canal, as well as reaction torque from the root canal wall.
AIM: AIM of the study is to evaluate the distribution of forces on the instrument in the apical 3rd of curved canal with three Nickel Titanium rotary systems. METHODOLOGY: Three brands of instruments (ProTaper Universal; DENTSPLY Maillefer, RevoS; MicroMega and Hyflex; Coltene-Whaledent, Allstetten, Switzerland) were scanned with the Laser assisted computerized scanner to produce a real-size, 3-dimensional (3-D) model for each. The stresses on the instrument during simulated shaping of a root canal were analyzed numerically by using a 3-D finite element package, taking into account the nonlinear mechanical behavior of the nickel-titanium material. RESULTS: RevoS shows lowest values for force generation in the apical 3rd of canal as compared to Protaper which shows highest values, while Hyflex shows intermediate values for forces. CONCLUSION: With FE simulation of root canal shaping by 3 files, it was observed that different instrument designs would experience unequal degree of force generation in canal, as well as reaction torque from the root canal wall.
Entities:
Keywords:
Finite element analysis; NiTi rotary files; Residual stresses; Screwing; Stress distribution