RESEARCH ARTICLE


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


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© 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) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), 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: z-moradi@sina.tums.ac.ir


Abstract

Background:

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

Objective:

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.

Results:

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.

Conclusion:

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.