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Effects of reducing light-curing time of a high-power LED device on shear bond strength of brackets

Auswirkungen der Verkürzung der Lichthärtezeit einer Hochleistungs-LED-Lampe auf die Scherbindungsfestigkeit von Brackets

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

Abstract

Purpose

To assess the effects of reducing the curing time of a high-power light-emitting diode (LED) unit (Valo, Ultradent, South Jordan, UT, USA) on shear bond strength (SBS) of metal brackets and on the amount of adhesive remnant of two orthodontic composites.

Methods

Eighty human premolars were divided into four groups (G1–4) according to curing time and composite: G1 (Transbond XT, 6 s), G2 (Opal Bond MV, 6 s), G3 (Transbond XT, 3 s), and G4 (Opal Bond MV, 3 s). Twenty-four hours after bonding, brackets were subject to a SBS test performed with a universal testing machine. Enamel surface was analyzed by SEM and the amount of adhesive remnant was assessed by the Image J software area calculation tool. Two-way analysis of variance was used for statistical analysis of SBS data, while Friedman and Mann–Whitney post hoc tests were used to analyze data on the amount of adhesive remnant.

Results

Time and composite significantly affected SBS (p < 0.001). The 6 s curing showed a higher SBS value (21.56 MPa) in comparison to 3 s curing (15.79 MPa). Transbond XT composite showed a significantly higher SBS value (21.06 MPa) compared to Opal Bond MV (16.29 MPa). After the SBS test, Opal Bond MV showed a significantly greater amount of composite adhered to enamel (p < 0.001).

Conclusion

Reducing exposure time from 6 to 3 s significantly decreased mean values of SBS, even with the use of a high-power LED unit. Reduction in time did not affect the amount of adhesive remnant.

Zusammenfassung

Ziel

Untersucht wurden die Auswirkungen der Verkürzung der Polymerisationszeit einer Hochleistungs-LED-Lampe („light-emitting diode“; Valo, Ultradent, South Jordan/UT, USA) auf die Scherbindungsfestigkeit (SBS) von Metallbrackets und auf die Menge der verbliebenen Adhäsivreste von 2 kieferorthopädischen Kompositen.

Methoden

Achtzig menschliche Prämolaren wurden in 4 Gruppen (G1-4) nach Aushärtezeit und Zusammensetzung eingeteilt: G1 (Transbond XT, 6s), G2 (Opal Bond MV, 6s), G3 (Transbond XT, 3 s) und G4 (Opal Bond MV, 3s). 24 h nach Bonding wurden die Brackets einem SBS-Test mittels Universalprüfmaschine unterzogen. Die Schmelzoberfläche wurde rasterelektronenmikroskopisch untersucht und die Menge der Kunststoffreste mittels des Flächenberechnungstools Image J ermittelt. Für die statistische Analyse der SBS-Daten diente die 2‑way ANOVA, die Adhäsivreste wurden mit den Post-hoc-Tests von Friedman und Mann-Whitney ausgewertet.

Ergebnisse

Sowohl Polymerisationszeit als auch Komposit nahmen signifikanten Einfluss auf die Scherbindungsfestigkeit (p < 0,001). Die Polymerisationszeit von 6s ergab einen durchschnittlich höheren SBS-Wert (21,6 MPa) im Vergleich zur kürzeren Aushärtung von 3s (15,8 MPa). Der durchschnittliche SBS-Wert von Transbond XT lag mit 21,1 MPa signifikant höher als der von Opal Bond MV (16,3 MPa). Opal Bond MV hinterließ nach dem SBS-Test eine größere Menge Komposit auf dem Schmelz (p < 0,001).

Fazit

Nach verkürzter Polymerisationszeit von 3 s fielen die durchschnittlichen SBS-Werte signifikant niedriger aus. Die verkürzte Polymerisationszeit nahm keinen Einfluss auf die Menge der verbliebenen Adhäsivreste.

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Authors and Affiliations

  1. Program of Orthodontics, Universidade Estadual Paulista, Araraquara, Brazil

    Layene Figueiredo Almeida DDS, MS &  Lidia Parsekian Martins DDS, MS, PhD

  2. Department of Orthodontics, Universidade Estadual Paulista, Araraquara, Brazil

    Renato Parsekian Martins DDS, MS, PhD

  3. Private practice, Rua Carlos Gomes, 2158, 14801340, Araraquara, SP, Brazil

    Renato Parsekian Martins DDS, MS, PhD

Authors
  1. Layene Figueiredo Almeida DDS, MS
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  2. Lidia Parsekian Martins DDS, MS, PhD
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Correspondence to Renato Parsekian Martins DDS, MS, PhD.

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Conflict of interest

L.F. Almeida, R. Parsekian Martins and L. Parsekian Martins declare that they have no competing interests.

Ethical standards

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Almeida, L.F., Martins, L.P. & Martins, R.P. Effects of reducing light-curing time of a high-power LED device on shear bond strength of brackets. J Orofac Orthop 79, 352–358 (2018). https://doi.org/10.1007/s00056-018-0146-0

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