Abstract
The aim of this study was to compare the shear bond strength of orthodontic brackets with different adhesive systems without and with saliva contamination. One hundred and twenty bovine teeth were selected. The experimental design consisted of three bonding systems: 1. Transbond Color Change (TPCC) (3M, Sumaré, São Paulo, Brazil) orthodontic composite resin and Transbond Plus Self Etching Primer (SEP) (3M, Sumaré, São Paulo, Brazil), 2. BracePaste Adhesive (BP) (American Orthodontics) orthodontic composite resin, São Paulo, São Paulo, Brasil) and BracePaste MTP primer (BPMTP) (American Orthodontics, São Paulo, São Paulo, Brasil) and 3. Fuji Ortho LC (FO) (GC,Tokyo, Japão) cement resin-modified glass ionomer cement. For each material, the brackets were cemented to the bovine enamel in two conditions, dry or contaminated by saliva, and photoactivated for a total of 12 seconds by the Valo light-curing device (Ultradent, Indaiatuba, São Paulo). The specimens were stored for 24 hours and aged by thermocycling for 10.000 cycles. The specimens were submitted to the shear bond strength (SBS) test (n=10). The results were subjected to a three-factor analysis of variance and the ionomer material was analyzed separately using a two-way analysis of variance and Tukey's test (ɑ = 0.05). After RUC, all the materials showed a decrease in bond strength when contaminated by saliva, but the BP system showed greater bond strength in all conditions, followed by TCC. FO showed lower bond strength when thermocycled. Saliva contamination reduces bond strength in all bonding systems.
Published Version
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