title: Effect of airborne-particle abrasion on dentin with experimental niobophosphate bioactive glass on the microtensile bond strength of resin cements.
abstract: OBJECTIVE
  The objective of this study was to evaluate the microtensile bond strength (μTBS) of two resin cements bonded to dentin pre-treated with experimental niobophosphate bioactive glass (NBG).
  
  
  METHODS
  The experimental bioactive glass was prepared by mixing different amounts of NbO5; (NH4)2HP4; CaO; Na2CO3. The particle size distribution and composition of the bioactive glass powder were determined. Twenty flat dentin surfaces from sound extracted human molars were polished with 600-grit SiC paper and air-abraded using experimental bioactive glass niobium powder. The bonding procedures were accomplished by the application of two resin cements: self-etching Panavia F or self-adhesive RelyX U-100. The resin-bonded specimens were cut and the μTBS test was performed after 24h. The failure mode was determined with a stereomicroscope at 40× magnification. The results were statistically analyzed by two-way ANOVA and Tukey tests (α=0.05).
  
  
  RESULTS
  The two-way ANOVA did not detect interactions between factors, but only a difference between the self-etching and self-adhesive cement (p=0.001). The self-etching resin cement Panavia F obtained a higher μTBS than the self-adhesive cement Relyx U-100. The predominant failure mode of the cements was adhesive/mixed between the resin cement and dentin.
  
  
  CONCLUSIONS
  A new bioactive glass containing niobium did not interfere with the immediate bonding performance of self-etching and self-adhesive cements.
authors: Department of Dentistry I, School of Dentistry, University Federal of Maranhão (UFMA), Av. dos Portugueses, s/n, 65085680 São Luis, Maranhão, Brazil.
authors: Edilausson Moreno
authors: EM
authors: Carvalho
authors: Department of Dentistry I, School of Dentistry, University Federal of Maranhão (UFMA), Av. dos Portugueses, s/n, 65085680 São Luis, Maranhão, Brazil.
authors: Darlon Martins
authors: DM
authors: Lima
authors: Department of Restorative Dentistry, School of Dentistry, University Ceuma (UNICEUMA), Josué Montello, 01, Renascença II, 65075120 São Luis, Maranhão, Brazil.
authors: Ceci Nunes
authors: CN
authors: Carvalho
authors: Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa (UEPG), Av. General Carlos Cavalcanti, 4748, Bloco M, Sala 64A, 84030900 Ponta Grossa, Paraná, Brazil.
authors: Alessandro Dourado
authors: AD
authors: Loguercio
authors: Center of Materials Science and Technology, Energy and Nuclear Research Institute (IPEN), Av. Lineu Prestes, 2242, Cidade Universitaria, 05588900 São Paulo, SP, Brazil.
authors: José Roberto
authors: JR
authors: Martinelli
authors: Department of Dentistry I, School of Dentistry, University Federal of Maranhão (UFMA), Av. dos Portugueses, s/n, 65085680 São Luis, Maranhão, Brazil. Electronic address: bauer@ufma.br.
authors: José
authors: J
authors: Bauer
mesh_terms: D020906:Air Abrasion, Dental / Q000379:methods*; D001840:Dental Bonding; D003804:Dentin; D005898:Glass / Q000737:chemistry; D006801:Humans; D010316:Particle Size; D010710:Phosphates; D019279:Resin Cements; D012117:Resins, Synthetic; D013718:Tensile Strength
chemical_list: D010710:Phosphates; D019279:Resin Cements; D012117:Resins, Synthetic
keywords: Bioactive glass; Dentin; EDX; Microtensile; Resin cements