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Scanning Electron Microscopy Comparison of the Cleaning Efficacy of a Root Canal System by Nd:YAG Laser and Rotary Instruments

Published online by Cambridge University Press:  02 June 2014

Mohammad Samiei ,
Seyyed Mahdi Vahid Pakdel ,
Sahand Rikhtegaran ,
Sahar Shakoei ,
Delaram Ebrahimpour  and
Pedram Taghavi
Mohammad Samiei
Affiliation:
Department of Endodontics, Tabriz University of Medical Sciences, Tabriz, Iran
Seyyed Mahdi Vahid Pakdel
Affiliation:
Department of Prosthodontics, Student’s research committee, Tabriz University of Medical Sciences, Tabriz, Iran
Sahand Rikhtegaran
Affiliation:
Department of Restorative dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
Sahar Shakoei
Affiliation:
Department of Endodontics, Tabriz University of Medical Sciences, Tabriz, Iran
Delaram Ebrahimpour*
Affiliation:
Department of Oral medicine, Tabriz University of Medical Sciences, Tabriz, Iran
Pedram Taghavi
Affiliation:
Dentist, Private practice, Tabriz, Iran
*
*Corresponding author. [email protected]
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Abstract

This study evaluated the cleaning efficacy of a root canal system by Nd:YAG laser and rotary instruments. Sixty single-rooted human teeth were divided into four experimental groups (n=15). In the first group the teeth were prepared with a step-back technique using conventional K-files. In the second and third groups, tooth preparation was carried out using Nd:YAG laser and rotary NiTi instruments, respectively. Teeth in the fourth group were prepared by combined laser and rotary methods. The smear layer remaining on canal walls was then assessed by scanning electron microscopy in the coronal, middle, and apical portions. The comparison of smear layer removal efficacy between groups was carried out by Kruskal–Wallis and Mann–Whitney U tests. The mean grades of smear layer removal in rotary-laser, rotary, laser and step-back techniques were 1.34±0.18, 2.2±0.28, 1.91±0.25, and 2.42 ±0.19, respectively. On the whole, differences between rotary-laser and rotary groups, step-back, and the three other techniques (rotary, laser, and rotary-laser) were significant at p=0.034. Based on the findings of this study, the cleaning efficacy of rotary, laser, and rotary-laser techniques were better than the step-back technique and the combined laser and rotary technique was the most efficient method.

Keywords

Nd:YAG laserrotary instrumentsmear layerSEM
Type
Biological Applications
Information
Microscopy and Microanalysis , Volume 20 , Issue 4 , August 2014 , pp. 1240 - 1245
Copyright
© Microscopy Society of America 2014 

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