Title
Stereomicroscopic evaluation of dentinal microcrack formation induced by rotary file systems: An in vitro study
Authors
Subhankar Banik¹, Navdeep Jethi², Pallawi Pallawi ³, 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
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
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.
