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Basic Study | Publishing Language: Chinese | Open Access

Effect of an Er:YAG laser combined with sodium hypochlorite on the elimination of Enterococcus faecalis in the root canal

Hong CHEN1( ), Fan XUE2, Qiaomei LI1, Yuehong LI3
Department of Endodontics, Shenzhen Stomatological Hospital, Southern Medical University, Shenzhen 51800, China
Department of Periodontics, Shenzhen Stomatological Hospital, Southern Medical University, Shenzhen 51800, China
Children's Department of Stomatology, Shenzhen Stomatological Hospital, Southern Medical University, Shenzhen 51800, China
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Abstract

Objective

To observe the killing and clearance effect of an Er:YAG laser combined with sodium hypochlorite on Enterococcus faecalis at different depths of the root canal in vitro to provide a reference for clinical application.

Methods

A total of 75 models of Enterococcus faecalis infection were successfully established and randomly divided into three groups (25 per group). Ten random samples per group underwent no processing. The remaining models in group A were treated with an Er:YAG laser combined with sodium hypochlorite 52.5 g/L. Group B was treated with 52.5 g/L sodium hypochlorite (positive control), and group C was treated with normal saline (negative control). The bacterial reduction rate was calculated for each group. The bactericidal effect on the surface of the root canal wall was observed in 5 samples by scanning electron microscopy.

Results

There was no statistically significant difference (P > 0.05) between group A (100.00 ± 0.00) and group B (98.62 ± 2.01) but was a statistically significant difference between group A (100.00 ± 0.00) and group C (64.37 ± 2.45) (P < 0.05). The percentage reduction in bacteria was higher in group A (99.46 ± 2.31) than in groups B (92.89 ± 3.07) and C (56.72 ± 4.96) (P < 0.05). The decrease in bacteria was greater in group A (97.62 ± 3.73) than in groups B (72.49 ± 2.35) and C (44.42 ± 4.78) (P < 0.05). The bacterial reduction rate in group A (95.89 ± 2.46) was higher than that in groups B (63.88 ± 1.08) and C (33.31 ± 5.21) (P < 0.05). There were significant differences at different dentin depths in the bacterial reduction rates among groups A, B and C (P < 0.05). Electron microscopy analysis showed that the Er:YAG laser combined with 52.5 g/L sodium hypochlorite was better than either treatment alone at removing bacteria from the surface of the root canal wall.

Conclusion

An Er:YAG laser can effectively enhance the bactericidal effect of sodium hypochlorite on the inner wall of the root canal.

Keywords

Er:YAG laserSodium hypochloriteEnterococcus faecalisRoot canal therapyElectron microscope
CLC number: R781.05 Document code: A Article ID: 2096-1456(2018)12-0773-06

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Journal of Prevention and Treatment for Stomatological Diseases
Volume 26 Issue 12,
December 2018
Pages 773-778
DOI: 10.12016/j.issn.2096-1456.2018.12.004

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Cite this article:
CHEN H, XUE F, LI Q, et al. Effect of an Er:YAG laser combined with sodium hypochlorite on the elimination of Enterococcus faecalis in the root canal. Journal of Prevention and Treatment for Stomatological Diseases, 2018, 26(12): 773-778. https://doi.org/10.12016/j.issn.2096-1456.2018.12.004

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Received: 03 July 2018
Revised: 29 August 2018
Published: 20 December 2018
© 2018 by Editorial Department of Journal of Prevention and Treatment for Stomatological Diseases

This article is licensed under a Creative Commons Attribution 4.0 International License.