THE EFFECT OF OPERATOR'S EXPERIENCE ON THE CYCLIC FATIGUE RESISTANCE OF ONE CURVE, 2SHAPE AND RECIPROC NITI FILE SYSTEMS

Adıgüzel M., YILMAZ K.

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi, cilt.31, sa.1, ss.46-51, 2021 (TRDizin)

Özet

Aim: The objective of this study was to compare the resistance to cyclic fatigue of One Curve (OC), 2Shape (TS), and Reciproc(RC) files by considering the operator’s experience.Materials and methods: Mesial root canals of ninety mandibular molar teeth were prepared by three endodontic residentsduring the first 6 months of their training (IE) or by three professionals with min. 5 years of endodontic training at postgraduatelevel (E). Then, 45 files used by the inexperienced group (IE-OC, IE-TS, and IE-RC), 45 files used by the experienced group (EOC, E-TS, and E-RC), and new 45 files (control group; C-OC, C-TS, and C-RC) were rotated in simulated canals until separationfailure occurred. (n=15) The time to fracture was calculated. For statistical analysis, ANOVA and Tukey’s post hoc tests wereused (P<0.05).Results: When compared to the experienced and inexperienced groups, the time-to-fracture of control group files was found tobe significantly higher (P<0.05). Comparing the experienced and inexperienced operator groups, no significant difference wasfound for RC files, whereas significant differences were determined for TS and OC files (P<0.05).Conclusions: The residual fatigue life of TS and OC instruments may be decreased by inexperienced operators more thanexperienced operators. Single file RC instrument was, however, not affected by the operator’s experience.