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Year : 2019  |  Volume : 9  |  Issue : 2  |  Page : 119-125

Comparative evaluation of efficiency of single-file rotary and reciprocating systems in instrumenting severely curved mesial root canals of extracted mandibular first molars: A morphometric study using cone-beam computed tomography

Department of Conservative Dentistry and Endodontics, Pushpagiri College of Dental Sciences, Thiruvalla, Kerala, India

Correspondence Address:
Dr. Deepthi Santhosh
Department of Conservative Dentistry and Endodontics, Pushpagiri College of Dental Sciences, Thiruvalla - 689 107, Kerala
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/sej.sej_86_18

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Aims and Objectives: The nickel–titanium multifile system is a viable tool in shaping severely curved canals as it reduces instrumentation errors. To eliminate the drawbacks with multifile systems, single-file systems were introduced. In this in vitro study, two single-file systems, One Shape and WaveOne, which work in a rotating and reciprocating motion, respectively, were compared with multifile systems for their efficiency in shaping severely curved mesial canals of extracted mandibular first molars, using cone-beam computed tomography (CBCT). Methodology: Fifty-two intact mesial roots of mandibular first molars with severely curved canals were selected using CBCT and divided into four groups of 13 samples each. Samples in Groups I, II, III, and IV, were instrumented using One Shape, WaveOne, ProTaper, and H and K-files, respectively. All the specimens were prepared up to working length to size 25 file using the manufacturer recommended technique along with standardized irrigation protocol. Pre- and postinstrumentation CBCT images were assessed at 8 mm, 5 mm, and 3 mm from apex to compare the changes in canal transportation (CT), canal centering (CC), and remaining dentin thickness. Results: All the groups showed CT with the statistically significant difference between the groups (P < 0.05). Except for ProTaper group at 5 mm (P < 0.05) none of the file systems showed CC. Except for Group I, a significant reduction in dentin thickness was noticed in Group II, III, and IV (P < 0.05). Conclusion: Among the two single-file systems compared, One Shape file in rotating motion prepared canals with fewer changes in canal anatomy than WaveOne file in the reciprocating motion.

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