Original Article

Effect of Er:YAG and Er,Cr:YSGG Lasers on Ceramic Bracket Debonding from Composite Blocks


Objectives: This study aimed to assess the effect of erbium-doped yttrium aluminum garnet (Er:YAG) and erbium, chromium: yttrium, scandium, gallium, garnet (Er,Cr:YSGG) lasers on the shear bond strength (SBS) of ceramic brackets debonding from the surface of composite blocks.
Materials and Methods: Thirty-six composite blocks were fabricated using Filtek Z250 light-cure composite. The surface of blocks was etched with 37% phosphoric acid for 30 seconds and then rinsed with water for 20 seconds and dried. Maxillary right central incisor ceramic orthodontic brackets were bonded to the surfaces of composite blocks using Transbond XT adhesive and were cured for 40 seconds. Twelve samples were irradiated with Er:YAG laser, while 12 samples were irradiated with Er,Cr:YSGG laser, and the brackets were then debonded using a universal testing machine. Twelve samples served as controls (debonding using the universal testing machine without using a laser). The adhesive  index score and bracket or composite cracks were evaluated under a stereomicroscope. One-way analysis of variance (ANOVA) was used for the comparison of the three groups. Kruskal-Wallis test was used to compare the ARI scores.
Results: The mean SBS was 17.01±5.22 MPa with Er:YAG laser, 18.03±6.46 MPa with Er,Cr:YSGG laser, and 16.61±6.73 MPa in the control group; the difference of the three groups was not significant (P=0.835). The difference in the ARI scores and enamel and composite cracks was not significant either (P>0.05).
Conclusions: This study did not show any reduction in the bond strength of ceramic bracket to composite blocks after Er:YAG and Er,Cr:YSGG laser irradiation.


Ahrari F, Heravi F, Fekrazad R, Farzanegan F, Nakhaei S. Does ultra-pulse CO2 laser reduce the risk of enamel damage during debonding of ceramic brackets? Lasers in medical science. 2012;27(3):567-74.

Han X, Liu X, Bai D, Meng Y, Huang L. Nd: YAG laser-aided ceramic brackets debonding: effects on shear bond strength and enamel surface. Applied Surface Science. 2008;255(2):613-5.

Eliades T, Brantley W. The inappropriateness of conventional orthodontic bond strength assessment protocols. The European Journal of Orthodontics. 2000;22(1):13-23.

Strobl K, Bahns TL, Wiliham L, Bishara SE, Stwalley W. Laser-aided debonding of orthodontic ceramic brackets. American Journal of Orthodontics and Dentofacial Orthopedics. 1992;101(2):152-8.

Alavi S, Birang R, Hajizadeh F, Banimostafaee H. Effect of bracket bonding with Er: YAG laser on nanomechanical properties of enamel. Dental research journal. 2014;11(1):49.

Wigdor H, Abt E, Ashrafi S, Walsh JT. The effect of lasers on dental hard tissues. The Journal of the American Dental Association. 1993;124(2):65-70.

Lee B-S, Hsieh T-T, Lee Y-L, Lan W-H, Hsu Y-J, Wen P-H, et al. Bond strengths of orthodontic bracket after acid-etched, Er: YAG laser-irradiated and combined treatment on enamel surface. The Angle Orthodontist. 2003;73(5):565-70.

de Oliveira MT, de Freitas PM, de Paula Eduardo C, Ambrosano GMB, Giannini M. Influence of diamond sono-abrasion, air-abrasion and Er: YAG laser irradiation on bonding of different adhesive systems to dentin. European journal of dentistry. 2007;1(3):158.

Dumore T, Fried D. Selective ablation of orthodontic composite by using sub‐microsecond IR laser pulses with optical feedback. Lasers in surgery and medicine. 2000;27(2):103-10.

Hibst R, Keller U. Experimental studies of the application of the Er: YAG laser on dental hard substances: I. Measurement of the ablation rate. Lasers in Surgery and Medicine. 1989;9(4):338-44.

Nalbantgil D, Tozlu M, Oztoprak MO. Pulpal Thermal Changes following Er-YAG Laser Debonding of Ceramic Brackets. The Scientific World Journal. 2014;2014:912429.

Rickabaugh JL, Marangoni RD, McCaffrey KK. Ceramic bracket debonding with the carbon dioxide laser. American journal of orthodontics and dentofacial orthopedics. 1996;110(4):388-93.

Obata A, Tsumura T, Niwa K, Ashizawa Y, Deguchi T, Ito M. Super pulse CO2 laser for bracket bonding and debonding. The European Journal of Orthodontics. 1999;21(2):193-8.

Hayakawa K. Nd: YAG laser for debonding ceramic orthodontic brackets. American journal of orthodontics and dentofacial orthopedics. 2005;128(5):638-47.

Yilanci H, Yildirim ZB, Ramoglu SI. Intrapulpal Temperature Increase During Er: YAG Laser-Aided Debonding of Ceramic Brackets. Photomedicine and laser surgery. 2017;35(4):217-22.

Al-maajoun MK, Henar TE, Tost AE, Terren CA. CO2 and Er, Cr: YSGG Laser Applications in Debonding Ceramic Materials: An in Vitro Study. Open Journal of Dentistry and Oral Medicine 2017;5(3):25-30.

Tehranchi A, Fekrazad R, Zafar M, Eslami B, Kalhori KA, Gutknecht N. Evaluation of the effects of CO2 laser on debonding of orthodontics porcelain brackets vs. the conventional method. Lasers in medical science. 2011;26(5):563-7.

Iijima M, Yasuda Y, Muguruma T, Mizoguchi I. Effects of CO2 laser debonding of a ceramic bracket on the mechanical properties of enamel. The Angle orthodontist. 2010;80(6):1029-35.

Ghazanfari R, Nokhbatolfoghahaei H, Alikhasi M. Laser-Aided Ceramic Bracket Debonding: A Comprehensive Review. Journal of lasers in medical sciences. 2016;7(1):2.

Oztoprak MO, Nalbantgil D, Erdem AS, Tozlu M, Arun T. Debonding of ceramic brackets by a new scanning laser method. American Journal of Orthodontics and Dentofacial Orthopedics. 2010;138(2):195-200.

Nalbantgil D, Oztoprak MO, Tozlu M, Arun T. Effects of different application durations of ER: YAG laser on intrapulpal temperature change during debonding. Lasers in medical science. 2011;26(6):735-40.

Mundethu AR, Gutknecht N, Franzen R. Rapid debonding of polycrystalline ceramic orthodontic brackets with an Er: YAG laser: an in vitro study. Lasers in medical science. 2014;29(5):1551-6.

Dostálováa T, Remeš M, Jelínková H, Šulcb J, Němecb M, Vyhlídal D, editors. Er: YAG laser metal and ceramic bracket debonding. Proc of SPIE Vol; 2016.

Heymann HO, Swift Jr EJ, Ritter AV. Sturdevant's Art & Science of Operative Dentistry-E-Book: Elsevier Health Sciences; 2014.

Fernandez L, Canut JA. In vitro comparison of the retention capacity of new aesthetic brackets. The European Journal of Orthodontics. 1999;21(1):71-7.

IssueVol 16, No 2 (2019) QRcode
SectionOriginal Article
DOI https://doi.org/10.18502/fid.v16i2.1359
Er:YAG Laser YSGG Lasers Solid-State Lasers Ceramics Orthodontic Brackets Dental Debonding Dental Bonding

Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
How to Cite
Mirhashemi AH, Hossaini SMH, Etemadi A, Kharazifard MJ, Bahador A, Soudi A. Effect of Er:YAG and Er,Cr:YSGG Lasers on Ceramic Bracket Debonding from Composite Blocks. Front Dent. 2019;16(2):88-95.

Most read articles by the same author(s)