The Open Dentistry Journal

ISSN: 1874-2106 ― Volume 14, 2020

Effect of CO2, Nd:YAG and Er:YAG Lasers on Microtensile Bond Strength of Composite to Bleached-Enamel

Mahshid Mohammadi Basir1, Mohammad Bagher Rezvani1, Nasim Chiniforush2, Zohreh Moradi3, *
1 Department of Operative Dentistry, Shahed University, Tehran, Iran
2 Laser Research Center of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
3 Department of Operative Dentistry, Tehran University of Medical Sciences, Tehran, Iran



Tooth restoration immediately after bleaching is challenging due to the potential problems in achieving adequate bond strength.


The aim of this study was to evaluate the effect of surface treatment with ER:YAG, ND:YAG, CO2 lasers and 10% sodium ascorbate solution on immediate microtensile bond strength of composite resin to recently bleached enamel.

Materials & Methods:

Ninety sound molar teeth were randomly divided into three main groups (n:30) : NB (without bleaching), HB (bleached with 38% carbamide peroxide) and OB (bleached with Heydent bleaching gel assisted by diode laser). Each group was divided into five subgroups (n:6) : Si (without surface treatment), Er (Er:YAG laser), CO2 (CO2 laser), Nd (Nd:YAG laser) and As (Immersion in 10% sodium ascorbate solution). The bonding system was then applied and composite build-ups were constructed. The teeth were sectioned by low speed saw to obtain enamel- resin sticks and submitted to microtensile bond testing. Statistical analyses were done using two- way ANOVA, Tukey and Tamhane tests.


µTBS of bleached teeth irradiated with ND:YAG laser was not significantly different from NB-Nd group. Microtensile bond strength of OB-Er group was higher than NB-Er and HB-Er groups. The mean µTBS of HB-CO2 group was higher than NB-CO2 group; the average µTBS of HB-As and OB-As groups was also higher than NB-As group.


Use of Nd:YAG, CO2 lasers and 10% sodium ascorbate solution could improve the bond strength in home-bleached specimens. Application of ND:YAG laser on nonbleached specimens and Er:YAG laser on office-bleached specimens led to the highest µTBS in comparison to other surface treatments in each main group.

Keywords: Bleaching, CO2 laser, Er:YAG laser, microtensile bond strength, Nd:YAG laser, sodium ascorbate.

Article Information

Identifiers and Pagination:

Year: 2016
Volume: 10
First Page: 148
Last Page: 157
Publisher Id: TODENTJ-10-148
DOI: 10.2174/1874210601610010148

Article History:

Received Date: 27/9/2015
Revision Received Date: 17/11/2015
Acceptance Date: 29/12/2015
Electronic publication date: 09/05/2016
Collection year: 2016

© Basir et al. ; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (, which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Department of Operative Dentistry, Tehran University of Medical Sciences, Tehran, Iran; Tel: +982188015017; Fax: +982188015017; E-mail:

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