Resumen

AHMED, S  y  SAAYMAN, CM. Evaluation of dentine damage after root canal preparation with rotary NiTi instruments. S. Afr. dent. j. [online]. 2018, vol.73, n.4, pp.198-203. ISSN 0375-1562.

AIM: The aim of this in-vitro study was to investigate the possible damage to root canal dentine during instrumentation with four different nickel-titanium rotary instruments and stainless steel hand files. MATERIALS AND METHODS: 90 permanent human mandibular molars, each having two mesial canals, were selected for the study. The mesial roots were randomly divided into six groups (n=30), with one group remaining unprepared as the control. The remaining five groups were randomly assigned to one of the nickel-titanium rotary instrumentation systems (Wave One ™, ProTaper NEXT™, iRaCe™, BT-Ftace™), and to a stainless steel hand file group. Roots were prepared and segmented at 3mm, 6mm and 9mm. Each segment was studied under stereomicroscope to detect any dentine damage. RESULTS: Data for the different groups were collected and summarised as percentages. Pairwise comparisons between the groups were done using Fisher's exact test. There were no significant differences between the four NiTi groups. However, there was a significant difference between the four groups and the stainless steel group (p<0.0001). CONCLUSION: Under the conditions of this in vitro study the use of all NiTi rotary instrumentation systems resulted in dentine damage whereas stainless steel hand instrumentation did not cause dentine damage.

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