Influence of etching time and bonding strategies on the microshear bond strength of self- and light-cured pit-and-fissure sealants

This study evaluated the impact of extended etching and bonding strategies on the microshear bond strength of three sealant materials. Two pit-and-fissure sealants [FluroShield, Dentsply (light-cured) and AlphaSeal, DFL (self-cured)] and one light-cured flowable composite resin (Permaflo, Ultradent) were evaluated according to different enamel etching times (15 s or 30 s) and bonding procedures (no adhesive application, application of primer/hydrophobic resin or hydrophobic resin only). Intact enamel blocks were obtained from bovine teeth and sealed via the tested protocols. After 24 h, the microshear bond strength test was performed in a universal testing machine at a crosshead speed of 0.5 mm/min. Failure modes were classified by stereomicroscopy. Data were submitted to a three-way ANOVA and to Tukey's test (α=0.05). There was no statistically significant difference (p>0.05) among the materials. Permaflo showed higher bond strength when etched for 30 s alone. Enamel overetching decreased the bond strength of the light-cured sealant. Primer/bond previous treatment improved bond performance for AlphaSeal. In conclusion, from the tested conditions, all sealant materials presented similar bond strength values in relation to bonding protocol and etching time. The flowable composite can be used as a pit-and-fissure sealant. The use of a three-step adhesive system was essential for the self-cured sealant application.

Bibliographic Details

Main Authors:	Souza-Junior,Eduardo José, Borges,Boniek Castillo Dutra, Montes,Marcos Antônio Japiassú Resende, Alonso,Roberta Caroline Bruschi, Ambrosano,Glaucia Maria Bovi, Sinhoreti,Mário Alexandre Coelho
Format:	Digital revista
Language:	English
Published:	Fundação Odontológica de Ribeirão Preto 2012
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-64402012000500002
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