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Different pulse modes of Er:YAG laser irradiation: effects on bond strength achieved with self-etching primers

Er:YAG-Laser-Bestrahlung mit unterschiedlichen Pulsmodi Effekte auf die Haftfestigkeit beim Kleben mit selbstätzenden Primern

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Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie Aims and scope Submit manuscript

Abstract

Objective

The aim of this study was to compare the effects of different pulse modes of Er:YAG laser on shear bond strength (SBS) of orthodontic brackets bonded with self-etching primers (SEP) and phosphoric acid etching.

Materials and methods

A total of 120 human mandibular third molars were randomly assigned to 3 groups of 40 specimens depending on the bonding procedure to be used. The groups were divided into two subgroups according to the pulse mode of the erbium-doped yttrium aluminum garnet (Er:YAG) laser irradiation as medium-short pulse (MSP) mode and quantum-square pulse (QSP) mode at 120 mJ, 10 Hz, 1.2 W. In each subgroup, the mesio- or distobuccal tooth surfaces were randomly assigned as experimental or control sides. After surface preparation with different modes of Er:YAG laser on experimental side, whole buccal tooth surfaces were treated with phosphoric acid etching or two different SEPs. Then metallic brackets were bonded with Transbond XT (3 M Unitek, Monrovia, CA, USA) or Kurasper F (Kuraray, Okayama, Japan). SBS values and the amount of adhesive remaining on the tooth after debonding were assessed. One-way analysis of variance (ANOVA) was used to evaluate the changes in mean SBS between groups resulting from laser etching, followed by post hoc test of Tukey.

Results

There were statistically significant differences between the experimental and control sides of all groups (p < 0.05).

Conclusion

Laser etching with QSP and MSP modes increases the SBS of metallic brackets and Er:YAG laser irradiation with QSP mode increases the SBS of SEPs.

Zusammenfassung

Ziel

In der Studie sollten die Effekte unterschiedlicher Er:YAG(“erbium-doped yttrium aluminum garnet”)-Laser-Pulsmodi auf die Scherhaftfestigkeit (“shear bond strength”, SBS) kieferorthopädischer Brackets untersucht werden, nach dem Kleben unter Verwendung selbstätzender Primer (“self-etching primers”, SEP) und Ätzung mit Phosphorsäure.

Material und Methoden

Insgesamt 120 humane dritte Molaren (Mandibula) wurden in 3 Gruppen à 40 Proben randomisiert, je nach verwendetem Klebe-Verfahren. Diese Gruppen wurden weiter unterteilt in jeweils 2 Untergruppen, je nach dem eingesetzten Pulsmodus des Er:YAGLasers: MSP(medium-short pulse)- bzw. QSP(quantum-square pulse)-Modus, 120 mJ, 10 Hz, 1,2 W. In jeder Untergruppe wurden die mesio- bzw. distobukkalen Zahnoberflächen randomisiert als experimentelle Seiten bzw. Kontrollseiten gewählt. Nach Oberflächenvorbereitung mit unterschiedlichen Er:YAG-Laser-Pulsmodi auf der experimentellen Seite wurden die gesamten bukkalen Zahnoberflächen mit Phosphorsäure oder mit 2 unterschiedlichen SEPs behandelt. Anschließend wurden Metall-Brackets mit Transbond XT (3 M Unitek, Monrovia, CA, USA) oder Kurasper F (Kuraray, Okayama, Japan) aufgebracht. Bestimmt wurden SBS-Werte und die Adhäsivmenge, die nach Debonding auf dem Zahn verblieben war. Zur Evaluierung der durch Laserätzung entstandenen SBS-Veränderungen zwischen den Gruppen dienten der Ein-Wege-ANOVA(“analysis of variance”)-Test und der anschließend durgeführte Post-hoc-Text nach Tukey.

Ergebnisse

Zwischen den experimentellen Seiten und den Kontrollseiten aller Gruppen bestanden statistisch signifikante Unterschiede (p < 0,05).

Schlussfolgerung

Eine Laserätzung in den Modi QSP und MSP verstärkt die SBS bei Metall-Brackets, und eine Er:YAG-Laser-Bestrahlung im QSP-Modus verstärkt die SBS bei Verwendung von SEPs.

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Authors and Affiliations

  1. Department of Orthodontics, Faculty of Dentistry, Selcuk University, Konya, Turkey

    Mehmet Akin, Emire Aybuke Erdur & Tancan Uysal

  2. Department of Orthodontics, Faculty of Dentistry, Izmir Katip Celebi University, Izmir, Turkey

    Ilknur Veli & Tancan Uysal

  3. Department of Orthodontics, Faculty of Dentistry, Bezmialem University, Istanbul, Turkey

    Sertac Aksakalli

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  1. Mehmet Akin
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  2. Ilknur Veli
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  3. Emire Aybuke Erdur
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  4. Sertac Aksakalli
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  5. Tancan Uysal
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Correspondence to Tancan Uysal.

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M. Akin, I. Veli, E.A. Erdur, S. Aksakalli, and Tancan Uysal state that there are no conflicts of interest. The accompanying manuscript does not include studies on humans or animals.

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Prof. Dr. Tancan Uysal.

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Akin, M., Veli, I., Erdur, E.A. et al. Different pulse modes of Er:YAG laser irradiation: effects on bond strength achieved with self-etching primers. J Orofac Orthop 77, 151–159 (2016). https://doi.org/10.1007/s00056-016-0019-3

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  • DOI: https://doi.org/10.1007/s00056-016-0019-3

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