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Effect of pre-etching on microtensile bond strength of a new multi-mode adhesive system submitted to dental substrates

Grant number: 13/13616-0
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): October 01, 2013
Effective date (End): September 30, 2014
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal researcher:Mirela Sanae Shinohara
Grantee:Sinval Pereira do Amaral Júnior
Home Institution: Faculdade de Odontologia (FOA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil


A new category called multi-mode adhesives systems has been introduced recently in the market that can be used with or without previous phosphoric acid etching (ac) to simplify the application technique and to reduce errors. The aim of this study will be to evaluate in vitro the bond strength of 2 adhesive systems (AS): Adper Single Bond 2 (SB) - conventional AS e Single Bond Universal (SBU) - multi-mode AS, which will be applied on different dental substrates: enamel (E), dentin (D) and dentin-enamel junction (AD). Forty-five bovine teeth will be selected and on each tooth will be prepared 2 standardized Class II cavities (PC-II) (6.0mm x 3.5mm x 2.0mm). Then, the PC-II will be randomly separated into 9 groups (n=10), according to the adhesive technique and dental substrate: 1.SB/E; 2.SB/D; 3.SB/AD; 4.SBU/E; 5.SBU/D; 6.SBU/AD; 7.SBU/E-ac; 8.SBU/D-ac; 9.SBU/AD-ac. All adhesive systems will be applied according to manufacturer's instructions on the PC-II, that will be restored with Filtek Z350XT (3M ESPE) resin composite, applying 3 increments of 2.0 mm each and each increment will be light-cured for 20 seconds. After storage 7 days in distilled water at 37ºC, the samples will be cut to obtain 3 fragments of each restoration and the adhesive interfaces will be reduced to 0.8mm² for obtaining hourglass-shape specimens. The specimens will be analyzed with microtensile test at a speed of 1mm/min and the MegaPascal values will be statistically analyzed at a significance level of 5%.