title: Adhesives Doped with Bioactive Niobophosphate Micro-Filler: Degree of Conversion and Microtensile Bond Strength.
abstract: To evaluate the effect of incorporating niobium phosphate bioactive glass (NbG) into commercial etch-and-rinse adhesive systems, with and without silane, on their degree of conversion (DC) (%) and microtensile bond strength (μTBS). The NbG micro-filler was added to two etch-and-rinse adhesive systems: One Step (OS) and Prime & Bond (PB) at 40% concentration. The following groups were formed: control without glass addition OS; addition of unsilanized NbG (OSNbG); addition of silanized NbG (OSNbGS); control without glass PB; addition of unsilanized NbG (PBNbG); addition of silanized NbG (PBNbGS). The DC was determined using total Fourier spectroscopy reflection (FTIR/ATR). For μTBS testing, 48 human third molars (n=8) were restored and sliced to obtain specimens (0.8 mm2) and they were tested at two different time intervals: immediately and after 6 months. The fracture mode was evaluated with a stereoscopic loupe (40×) and by scanning electron microscopy (SEM). The data were subjected to ANOVA and Tukey tests (a=0.05). NbG addition did not compromise the adhesive system DC values (p>0.05). Furthermore, the NbG added to the adhesive systems did not affect μTBS values (p>0.05). Fracture occurred predominantly at the dentin-adhesive interface. NbG bioactive glass did not affect the DC or microtensile bond strength results.
authors.affiliation: Department of Restorative Dentistry, Dental School, Universidade CEUMA, São Luís, MA, Brazil.
authors.forename: Karina Kato
authors.initials: KK
authors.lastname: Carneiro
authors.affiliation: Department of Chemistry, CCT, UDESC - Universidade do Estado de Santa Catarina, Joinville, SC, Brazil.
authors.forename: Marcia Margarete
authors.initials: MM
authors.lastname: Meier
authors.affiliation: Materials Research Group, Physics Department, UFMA - Universidade Federal do Maranhão, São Luís, MA, Brazil.
authors.forename: Clenilton Costa Dos
authors.initials: CC
authors.lastname: Santos
authors.affiliation: Department of Chemistry, CCET, UFMA - Universidade Federal do Maranhão, São Luís, MA, Brazil.
authors.forename: Adeilton Pereira
authors.initials: AP
authors.lastname: Maciel
authors.affiliation: Department of Endodontics, Dental School, Universidade CEUMA, São Luís, MA, Brazil.
authors.forename: Ceci Nunes
authors.initials: CN
authors.lastname: Carvalho
authors.affiliation: Discipline of Dental Materials, Dental School, UFMA - Universidade Federal do Maranhão, São Luís, MA, Brazil.
authors.forename: José
authors.initials: J
authors.lastname: Bauer
mesh_terms: D001840:Dental Bonding; D003738:Dental Cements; D003799:Dental Stress Analysis; D008855:Microscopy, Electron, Scanning; D009556:Niobium / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013718:Tensile Strength
chemical_list: D003738:Dental Cements; D010710:Phosphates; D009556:Niobium