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Published on: July 30, 2007
Effect of light-curing units in shear bond strength of metallic brackets: an in vitro study
Luciana Borges Retamoso1, Niége Michelle Lazzari Onofre, Luciane Hann
1Pontifical Catholic University of Rio Grande do Sul, Curitiba, PR, Brazil. retamosolb@gmail.com
Objectives:
To determine the influence of the light curing units on the shear bond strength of orthodontic brackets.
Material And Methods:
Seventy-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.
Results:
The 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).
Conclusion:
The 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.
