Abstract
Background: Centering ability of root canal files is considered to be an imperative factor during root canal instrumentation. Hence it is decided to evaluate and compare the centering ability of Reciprocating rotary files in teeth by means of cone beam computed tomography in vitro condition.
 Objectives:
 
 To evaluate the centering ability of the Reciproc file system in extracted mandibular molar.
 To evaluate the centering ability of the Reciproc Blue file system in extracted mandibular molar.
 To evaluate the centering ability of the WaveOne file system in extracted mandibular molar.
 To compare the above file systems with each other.
 
 Methodology: 30 Newly extracted mandibular molars will be considered in the study. Before access opening teeth will be exposed for a pre-instrumentation CBCT scan. After this scanning standard access cavity preparation will be done followed by checking canal patency using 10#K-file. Then teeth will be divided into three groups for root canal instrumentation. Group 1: Instrumentation by using Reciproc file, Group 2: Instrumentation by using Reciproc Blue file, Group 3: Instrumentation by using WaveOne file. For evaluation of centering ability, the equation introduced by Gambill (1996) i.e., (m1 – m2) ÷ (d1 – d2) or (d1 – d2) ÷ (m1 – m2) and (b1-b2) ÷ (l1-l2) or (l1-l2) ÷ (b1-b2) will be used after post instrumentation CBCT scanning. 
 Expected Results: The Reciproc Blue file system is expected to give better results in canal centering ability.
 Conclusion: Centering ability is considered to be important factor in biomechanical preparation, as it can retain the instruments in centre which is crucial to offer a precise extension, without weakening of the root structure. Different files are used to evaluate and compare the centering ability of instrument by CBCT.
Highlights
Biomechanical preparation is the most significant step in the root canal procedure
Centering ability is considered to be important factor in biomechanical preparation, as it can retain the instruments in centre which is crucial to offer a precise extension, without weakening of the root structure
Song et al in his study showed that the while evaluating centering ability of canal using two Nickel-titanium and one stainless steel Ktype in teeth, the result showed that Ni-Ti contributes for even cutting of the dentin with the canal wall further making them centred as compared to the stainless-steel K-type file [2,7]
Summary
Biomechanical preparation is the most significant step in the root canal procedure. The principles of the root canal shaping comprise of continuous tapering conical shape from the canal orifice to the root apex while preserving the actual shape of the root canal without altering the root canal curvature [1,2,3]. Song et al in his study showed that the while evaluating centering ability of canal using two Nickel-titanium and one stainless steel Ktype in teeth, the result showed that Ni-Ti contributes for even cutting of the dentin with the canal wall further making them centred as compared to the stainless-steel K-type file [2,7]. To overcome this complication rotary instruments were used. For evaluation of centering ability, the equation introduced by Gambill (1996) i.e., (m1 – m2) ÷ (d1 – d2) or (d1 – d2) ÷ (m1 – m2) and (b1-b2) ÷ (l1-l2) or (l1-l2) ÷ (b1-b2) will be used after post instrumentation CBCT scanning
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