The minimum residual root thickness after using ProTaper, RaCe and Gates-Glidden drills: A cone beam computerized tomography study

• Published in: European journal of dentistry Vol. 9; no. 2; pp. 228 - 233
• Main Authors: Akhlaghi, Nahid Mohammadzadeh, Bajgiran, Laleh Mohammadian, Naghdi, Amirali, Behrooz, Elaheh, Khalilak, Zohreh
• Format: Journal Article
• Language: English
• Published: A-12, Second Floor, Sector -2, NOIDA -201301, India Thieme Medical and Scientific Publishers Private Ltd 01.04.2015; Medknow Publications and Media Pvt. Ltd; Medknow Publications & Media Pvt Ltd
• Subjects: CAT scans; Dental technology; Innovations; Methods; Original; Original Article; Physiological aspects; Tooth roots; root canal preparation; dentin; instrumentation; Dental instruments
• ISSN: 1305-7456; 1305-7464
• DOI: 10.4103/1305-7456.156833

ABSTRACT Objective : The aim of this study was to evaluate the minimum residual root thickness (MRRT) of the danger zone after preflaring of the mesio-buccal (MB) canal of mandibular first molars using ProTaper, RaCe and Gates-Glidden (GG) drills as coronal shapers by cone beam computerized tomography (CBCT). Materials and Methods: In this experimental study, the initial CBCT scans of 75 MB canals of mandibular first molars were provided within 1, 2, 3 and 4 mm of the furcation level. The samples were divided into three groups. The samples of ProTaper and RaCe groups were prepared up to F2 and #25.04 as the master apical file (MAF), respectively. The coronal preparation of the samples in the GG group was done using GG drills #2, #3 and #4 and canals were prepared till MAF # 25. After obtaining the postinstrumentation images, the MRRT and the amount of removed dentin were analyzed by t -test and ANOVA statistical analyses. Results: The GG drills removed significantly more dentin than RaCe at all the sections ( P < 0.05) and more than ProTaper at 3 mm from the furcation. Statistically there was no significant difference between ProTaper and RaCe groups ( P > 0.05). There was no significant difference in MRRT between the groups ( P > 0.05). The mean MRRT was not < 0.75 mm at all sections. Conclusion: Based on the results of this study, when an appropriate root thickness is initially present, all of the instruments that were investigated may safely be used as coronal shapers in MB canals of mandibular first molars.