Title

Stereomicroscopic evaluation of dentinal microcrack formation induced by rotary file systems: An in vitro study

Authors

Subhankar Banik¹, Navdeep Jethi², Pallawi Pallawi³, Alakesh Singha⁴, T. Jansiya⁵ & Monalisa Debbarma¹,*

Affiliation

¹Department of Conservative Dentistry and Endodontics, Agartala Government Dental College and IGM Hospital, Agartala, Tripura, India; ²Department of Conservative Dentistry and Endodontics, Daswani Dental College and Research Centre, Ranpur, Rajasthan, India; ³Department of Dentistry, Nalanda Medical College and Hospital, Patna, Bihar, India; ⁴Department of Conservative Dentistry and Endodontics, Jaipur Dental College, Jaipur, Rajasthan, India; ⁵Department of Orthodontics and Dentofacial Orthopedics, Vinayaka Mission’s Sankarachariyar Dental College and Hospital, Vinayaka Mission’s Research Foundation (Deemed to be University), Salem, Tamil Nadu, India; *Corresponding author

Email

Subhankar Banik - E-mail: drsubhankar27@gmail.com

Navdeep Jethi - E-mail: navdeepk43@gmail.com

Pallawi Pallawi - E-mail: pallawi13dec@gmail.com

Alakesh Singha - E-mail: alakesh.singha12@gmail.com

T. Jansiya - E-mail: jansiya14@gmail.com

Monalisa Debbarma - E-mail: drmona993@gmail.com

Article Type

Research Article

Date

Received July 1, 2026; Revised July 31, 2026; Accepted July 31, 2026, Published July 31, 2026

Abstract

Root canal instrumentation should preserve radicular dentin to maintain fracture resistance, yet different rotary systems may produce dentinal defects during shaping. Therefore, it is of interest to compare the incidence and types of defects caused by ProTaper Next and OneShape in single-rooted mandibular premolars. Forty-five extracted premolars were divided into control, ProTaper Next and OneShape groups and then sectioned at 2, 4 and 6 mm from the apex for stereomicroscopic evaluation. Both rotary systems produced significantly more defects than the control, but no significant difference was found between ProTaper Next and OneShape in defect incidence or distribution. Thus, data shows that continuous rotary instrumentation with either system increases dentinal microcracks compared with uninstrumented teeth.

Keywords

Stereomicroscopic, rotary file, root canal, obturation, endodontics

Citation

Banik et al. Bioinformation 22(7): 4452-4458 (2026)

Edited by

Vini Mehta

ISSN

0973-2063

Publisher

Biomedical Informatics

License

This is an Open Access article which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. This is distributed under the terms of the Creative Commons Attribution License.