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Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie
Published in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie 5/2018

01-09-2018 | Original Article

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

Authors: Layene Figueiredo Almeida, DDS, MS, Prof. Lidia Parsekian Martins, DDS, MS, PhD, Prof. Dr. Renato Parsekian Martins, DDS, MS, PhD

Published in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie | Issue 5/2018

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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.
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Metadata
Title
Effects of reducing light-curing time of a high-power LED device on shear bond strength of brackets
Authors
Layene Figueiredo Almeida, DDS, MS
Prof. Lidia Parsekian Martins, DDS, MS, PhD
Prof. Dr. Renato Parsekian Martins, DDS, MS, PhD
Publication date
01-09-2018
Publisher
Springer Medizin
Published in
Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie / Issue 5/2018
Print ISSN: 1434-5293
Electronic ISSN: 1615-6714
DOI
https://doi.org/10.1007/s00056-018-0146-0

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