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One-year stability of resin-dentin bonds created with a hydrophobic ethanol-wet bonding technique.
Sadek, Fernanda T; Castellan, Carina S; Braga, Roberto R; Mai, Sui; Tjäderhane, Leo; Pashley, David H; Tay, Franklin R.
Afiliação
  • Sadek FT; Department of Dental Materials, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil.
Dent Mater ; 26(4): 380-6, 2010 Apr.
Article em En | MEDLINE | ID: mdl-20083304
UNLABELLED: Dentin bonding performed with hydrophobic resins using ethanol-wet bonding should be less susceptible to degradation but this hypothesis has never been validated. OBJECTIVES: This in vitro study evaluated stability of resin-dentin bonds created with an experimental three-step BisGMA/TEGDMA hydrophobic adhesive or a three-step hydrophilic adhesive after one year of accelerated aging in artificial saliva. METHODS: Flat surfaces in mid-coronal dentin were obtained from 45 sound human molars and randomly divided into three groups (n=15): an experimental three-step BisGMA/TEGDMA hydrophobic adhesive applied to ethanol (ethanol-wet bonding-GI) or water-saturated dentin (water-wet bonding-GII) and Adper Scotchbond Multi-Purpose [MP-GIII] applied, according to manufacturer instructions, to water-saturated dentin. Resin composite crowns were incrementally formed and light-cured to approximately 5mm in height. Bonded specimens were stored in artificial saliva at 37 degrees C for 24h and sectioned into sticks. They were subjected to microtensile bond test and TEM analysis immediately and after one year. Data were analyzed with two-way ANOVA and Tukey tests. RESULTS: MP exhibited significant reduction in microtensile bond strength after aging (24h: 40.6+/-2.5(a); one year: 27.5+/-3.3(b); in MPa). Hybrid layer degradation was evident in all specimens examined by TEM. The hydrophobic adhesive with ethanol-wet bonding preserved bond strength (24h: 43.7+/-7.4(a); one year: 39.8+/-2.7(a)) and hybrid layer integrity, with the latter demonstrating intact collagen fibrils and wide interfibrillar spaces. SIGNIFICANCE: Coaxing hydrophobic resins into acid-etched dentin using ethanol-wet bonding preserves resin-dentin bond integrity without the adjunctive use of MMPs inhibitors and warrants further biocompatibility and patient safety's studies and clinical testing.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Colagem Dentária / Adesivos Dentinários / Cimentos de Resina / Dentina Limite: Humans Idioma: En Revista: Dent Mater Assunto da revista: ODONTOLOGIA Ano de publicação: 2010 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Colagem Dentária / Adesivos Dentinários / Cimentos de Resina / Dentina Limite: Humans Idioma: En Revista: Dent Mater Assunto da revista: ODONTOLOGIA Ano de publicação: 2010 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido