A survey of interfacial forces used during filing of root canals

Regan J, Sherriff M, Meredith N and Gulabivala K (2000) A survey of interfacial forces used during filing of root canals. Endodontics and Dental Traumatology, 16 3: 101-106. doi:10.1034/j.1600-9657.2000.016003101.x

Author Regan J
Sherriff M
Meredith N
Gulabivala K
Title A survey of interfacial forces used during filing of root canals
Journal name Endodontics and Dental Traumatology   Check publisher's open access policy
ISSN 1600-4469
Publication date 2000-06
Sub-type Article (original research)
DOI 10.1034/j.1600-9657.2000.016003101.x
Volume 16
Issue 3
Start page 101
End page 106
Total pages 6
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell Publishing
Language eng
Abstract The pattern of dentine removal during endodontic instrumentation is influenced by many factors including the interfacial forces applied by the operator. The aim of this study was to investigate the influence of operators and different sizes and types of instruments on the magnitude of these interfacial forces. Single-rooted teeth were mounted on a cantilevered aluminium beam to which two pairs of single element strain gauges were joined in a half-bridge configuration and mounted at right angles to each other. The strain gauges were connected to an analogue-to-digital converter fitted in a micro-computer via conditioning amplifiers. This enabled strains to be recorded over a period of time. Twenty operators instrumented root canals using a series of hand instruments for 1 min each. The mean interfacial forces used by operators demonstrated a wide variation ranging from 9.06 g to 149.42 g (range of forces from 0–331 g) but there was a consistency in the relative magnitude for each operator. The 20 operators could be divided into 13 groups which were significantly different (α=0.05) from each other. There were significant differences (α=0.05) between the forces used for each of the K-Flex files (15, 25, 35, 45, and 70), the force increasing with the file size. There was also a significant difference (α=0.05) in the forces used between the Flexofile (#25) and the #25 K-Flex and Hedström files. However, there was no significant difference between the K-Flex and Hedström files.
Keyword Interfacial forces
Root canal preparation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Dentistry Publications
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Created: Wed, 19 Oct 2011, 16:53:27 EST by Neil Meredith on behalf of School of Dentistry