Shear bond strength of orthodontic brackets bonded using halogen light and light-emitting diode at different debond times
Data de publicação2010-01-01
Direito de acesso
MetadadosExibir registro completo
The aim of this in vitro study was to compare the photoactivation effects of QTH (Quartz-Tungsten-Halogen) and LED (Light-Emitting Diode) on the SBS (Shear Bond Strength) of orthodontic brackets at different debond times. Seventy-two bovine lower incisors were randomly divided into two groups according to the photoactivation system used (QTH or LED). The enamel surfaces were conditioned with Transbond self-etching primer, and APC (Adhesive Pre-Coated) brackets were used in all specimens. Group I was cured with QTH for 20 s and Group II with LED for 10 s. Both groups were subdivided according to the different experimental times after bonding (immediately, 24 h and 7 days). The specimens were tested for SBS and the enamel surfaces were analyzed according to the Adhesive Remnant Index (ARI). The statistical analysis included the Tukey's test to evaluate the main effects of photoactivation and debond time on SBS. The Chi-square test was used to compare the ARI values found for each group, and no statistically significant difference was observed. The debond time of 7 days for QTH photoactivation showed statistically greater values of SBS when compared to the immediate and 24 h periods. There was no statistically significant difference between the QTH and LED groups immediately and after the 24 h period. In conclusion, bonding orthodontic brackets with LED photoactivation for 10 s is suggested because it requires a reduced clinical chair time.
Como citar este documento
Este item aparece nas seguintes coleções
Exibindo os itens relacionados pelo título, autor e palavra-chave.
da Silva, Melissa Aline ; Rangel, Patrícia Maria ; Barcellos, Daphne Câmara ; Pagani, Clovis ; Torres, Carlos Rocha Gomes (Journal of Contemporary Dental Practice, 2013) [Artigo]Aim: This study evaluates bond strength between dentin and composite using adhesives with different solvents to dry and wet dentin. Materials and methods: Ninety bovine incisors were used; the vestibular surfaces were worn ...
Magno, A. F F ; Martins, R. P. ; Vaz, Luis Geraldo ; Martins, Lidia Parsekian (Orthodontics and Craniofacial Research, 2010) [Artigo]Authors - Magno AFF, Martins RP, Vaz LG, Martins LP Objectives - Evaluate the shear bond strength (SBS) and the adhesive remnant index (ARI) of indirect bonded lingual brackets using xenon plasma arc light, light-emitting ...
Effect of thickness of indirect restoration and distance from the light-curing unit tip on the hardness of a dual-cured resin cement de Paula, Andréia Bolzan; Tango, Rubens Nisie ; Sinhoreti, Mário Alexandre Coelho; Alves, Marcelo Corrêa; Puppin-Rontani, Regina M. (Brazilian Dental Journal, 2010) [Artigo]This study evaluated the Knoop hardness and polymerization depth of a dual-cured resin cement, light-activated at different distances through different thicknesses of composite resin. One bovine incisor was embedded in ...