STEREOMICROSCOPIC EVALUATION OF DENTINAL MICRO CRACKS CAUSED BY THREE DIFFERENT SINGLE FILE SYSTEMS

Abstract

Although Ni-Ti rotary instruments have many advantages over hand instruments, Ni-Ti rotary instruments can induce stresses on the canal wall and cause dentinal cracks in root dentin. Recently, a new generation of NiTi files has been introduced with a variable cross-sectional design and their kinematics of activation in rotary or reciprocating motion allowed the possibility to shape root canals with single-file systems. ProTaper Gold (Dentsply, Sirona), One Shape File and Reciproc files were introduced in the family of NiTi rotary instruments were introduced as single file systems. Each of these files was used to instrument 20 teeth and 10 teeth were left as control. After sectioning stereomicroscopic images were analysed at three different levels. Sections were classified as “no crack’’ or as “crack”. Results show that incidence of cracks is maximum in ProTaper Gold followed by Reciproc and least incidence of micro cracks has been found with One Shapefile. So the present study concludes all files cause dentinal cracks but among single files used One Shape causes less micro cracks in dentin.
Keywords: Dentsply, Sirona