Effect of light-curing units in shear bond strength of metallic brackets:
an in vitro study |
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| Authors: | Luciana Borges RETAMOSO Niége Michelle Lazzari ONOFRE Luciane HANN Ernani Menezes MARCHIORO |
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| Institution: | 1. DDS, PhD student, Master’s degree program in Orthodontics, Pontifical Catholic University of Paraná, Curitiba, PR, Brazil.;2. DDS, Graduate student, Master’s degree program in Orthodontics, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil.;3. Private Practice, Porto Alegre, RS, Brazil.;4. DDS, MSc, PhD, Associate Professor of Orthodontics, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil. |
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| Abstract: | ObjectiveTo determine the influence of the light curing units on the shear bond strength of
orthodontic brackets.Material and MethodsSeventy-two premolars were divided into six groups (n=12): Group I: brackets
bonded with Transbond and polymerization with halogen light; Group II: Transbond
and LED; Group III: Fuji Ortho and halogen light; Group IV: Fuji Ortho and LED;
Group V: Fuji Ortho, without acid and halogen light; Group VI: Fuji Ortho, without
acid and LED. The groups were tested to shear strength in a universal testing
machine at a crosshead speed of 0.5 mm/min. Data were analyzed statistically by
ANOVA and Tukey’s test.ResultsThe composite resin presented higher shear bond strength than the resin-modified
glass ionomer cement (p<0.05). The halogen light and LED sources produced
similar shear bond strength (p>0.05).ConclusionThe shear bond strength was influenced by the material but not by the light-curing
unit. The use of LED reduced the experimental time by approximately 60%, with the
same curing efficiency. |
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| Keywords: | Shear bond strength Halogen light LED Brackets |
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