The definition of glide path and preflaring procedures remains controversial. Glide path preparation significantly reduces canal transportation and the risk of debris extrusion. Coronal preflaring increases the accuracy of working length determination and decreases the amount of debris extrusion.
Hartmann RC, Peters OA, de Figueiredo JAP, Rossi-Fedele G. Association of manual or engine-driven glide path preparation with canal centring and apical transportation: a systematic review.
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