“Coronal Flaring and Biomechanical Preparation Affecting the Working Length of the Curved Canals” – An In Vitro Study.
Journal Title: International Journal of Medical Science and Innovative Research (IJMSIR) - Year 2017, Vol 2, Issue 6
Abstract
Root canal anatomy varies greatly, and the curvature may begin at any level in the canal.1 During instrumentation care has to be taken to prevent any under or over instrumentation to prevent, or straightening of a curved canal due to over instrumentation, or transporting of the apical foramen because canals can curve at any an level, even straight canals may curve at the apical third.2 It has been found that the stainless steel instrument tend to straighten the curved canals more than any Ni-Ti instrument due to the stiffness of the stainless steel files.3Further development taken in the field has led to development of various Ni-Ti instruments that allows better shaping of the curved canals.4Clinical trials comparing the use of Stainless steel instrumentation with that of Ni-Ti instruments reveal that Stainless steel instrument showed more failures than Ni-Ti on one year post-operative radiographic evaluation. Post-obturation inspite of all the latest developments in the material, design, length and the cutting edge of the blades, still there remains a chance of obtaining procedural errors. Weine et al had mentioned that more flared preparations may reduce the chances of elbow formation at the apical third.5 Various techniques have been recommended for flaring of the canals, but most commonly used are the Crown Down and Step Back Technique. Hence, this in-vitro study was conducted with the following objectives: •To evaluate the loss of working length after coronal flare with hand stainless steel K files and Nickel-Titanium rotary files (Protaper rotary and RACE system) To evaluate the loss of working length after complete canal preparation with hand stainless steel K –files and Nickel-Titanium rotary files (Protaper rotary and RACE system).
Authors and Affiliations
Dr. Saurav Purbay
Keywords
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