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Influence of contemporary nickel-titanium rotary systems on root canal dentin preservation: A cone-beam computed
Likhitha Palla1, Roopesh Borugadda1, U Lavanya Neelima1
1Department of Conservative Dentistry and Endodontics, GSL Dental College and Hospital, Rajahmundry, Andhra Pradesh, India.
Context:
Preservation of canal dentin during rotary root canal instrumentation is essential to maintain structural tooth strength and prevent procedural mishaps. Limited data exist comparing dentin changes between contemporary nickel-titanium (NiTi) rotary systems using three-dimensional imaging.
Aims:
This study aims to evaluate and compare canal dentin changes following instrumentation with three NiTi rotary file systems using cone-beam computed tomography (CBCT).
Materials And Methods:
Sixty-six extracted human mandibular premolars with single straight canals were decoronated and randomly allocated to three groups (n = 22) based on the rotary system used: ProTaper Gold, NeoEndo Flex, and GenEndo. Canals were prepared according to the manufacturer's protocols. Pre- and post-instrumentation CBCT scans were obtained. Dentin thickness was measured at 3 mm, 6 mm, and 9 mm from the apex. Differences in dentin thickness pre- and post-instrumentation were calculated for each system.
Statistical Analysis Used:
One-way analysis of variance followed by Tukey's post hoc test was performed; statistical significance was set at P < 0.05.
Results:
Significant intergroup differences in dentin reduction were observed at all root levels (P < 0.001). Mean reduction (coronal-apical) was highest with ProTaper Gold (1.15-0.97 mm), intermediate with NeoEndo Flex (0.56-0.51 mm), and lowest with GenEndo (0.28-0.10 mm).
Conclusions:
Different NiTi rotary systems result in varying canal dentin changes. Among those evaluated, GenEndo preserved dentin most effectively, while ProTaper Gold resulted in greater dentin reduction. CBCT is a reliable tool for non-destructive assessment of dentin changes after instrumentation.
