Evolution of the combined effect of different irrigation solutions and activation techniques on the removal of smear layer and dentin microhardness in oval-shaped root canal – An in-vitro study

Authors

  • Lu Shi Department of Endodontics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China
  • Jie Wan Department of Endodontics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China
  • Yunfei Yang Department of Endodontics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China
  • Ying Yao Department of Endodontics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China
  • Ruiming Yang Department of Endodontics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China
  • Wen Xie Department of Endodontics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China

DOI:

https://doi.org/10.17305/bjbms.2022.7440

Keywords:

Root canal therapy, photon-induced photoacoustic streaming, passive ultrasonic irrigation, smear layer, dentin microhardness

Abstract

The aim of this in vitro study was to evaluate the effect of three final irrigants, namely QMix, MTAD and EDTA, combined with three irrigation techniques, namely conventional needle irrigation (CNI), passive ultrasonic irrigation (PUI) and photon-induced photoacoustic streaming (PIPS), on smear layer removal, dentin mineral content and microhardness in oval-shaped canals.    130 decoronated premolars with single, oval root canals were equally divided into1 blank control group and 12 treatment groups (n=10) according to the final irrigation protocols. Roots in treatment groups were instrumented with ProTaper Gold to size F4 and subjected to final irrigation. Smear layer removal was assessed by using a four-level scoring system under an environmental scanning electron microscope. Energy dispersive X-ray spectroscopy was performed to measure the dentin mineral content. Dentin microhardness was measured by Knoop microhardness testing. Statistical analysis of the data was performed by using Kruskal-Wallis test, followed by Dunn’s post hoc test with Bonferroni correction. PUI- and PIPS-activated QMix and EDTA removed smear layer more effectively than MTAD groups (p<0.05). Regarding the dentin mineral content and microhardness, QMix groups yielded the least calcium (Ca), phosphorus (P)  and Ca/P ratio, followed by EDTA groups and MTAD groups (p<0.05). QMix groups produced significantly lower dentin microhardness values and higher hardness reduction percentages than MTAD groups (p<0.05).  Within the limitations of the present study, it was concluded that QMix and EDTA were superior to MTAD in smear layer removal, especially when activated by PUI and PIPS, but these agents produced more pronounced effect on dentin mineral content and microhardness than MTAD.

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Author Biographies

Jie Wan, Department of Endodontics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China

Department of Endodontics

Yunfei Yang, Department of Endodontics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China

Department of Endodontics

Ying Yao, Department of Endodontics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China

Department of Endodontics

Ruiming Yang, Department of Endodontics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China

Department of Endodontics

Wen Xie, Department of Endodontics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China

Department of Endodontics

Evolution of the combined effect of different irrigation solutions and activation techniques on the removal of smear layer and dentin microhardness in oval-shaped root canal – An in-vitro study

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Published

2022-07-25

How to Cite

1.
Shi L, Wan J, Yang Y, Yao Y, Yang R, Xie W. Evolution of the combined effect of different irrigation solutions and activation techniques on the removal of smear layer and dentin microhardness in oval-shaped root canal – An in-vitro study. Bosn J of Basic Med Sci [Internet]. 2022Jul.25 [cited 2022Dec.6];. Available from: https://bjbms.org/ojs/index.php/bjbms/article/view/7440

Issue

Section

Pharmacology