title: Nanohybrid resin composites: nanofiller loaded materials or traditional microhybrid resins?
abstract: Nanohybrid resin composites present conventional particles to be mixed with nanomeric fillers and, therefore, it is unknown whether they may perform similarly to nanofilled or microhybrid resins. The current study investigated the properties of nanohybrid resins (TPH3, Grandio, Premise, Concept Advanced) in comparison with a nanofilled (Supreme XT) and a microhybrid (Z250) composite. The inorganic fillers were characterized by SEM/EDS analysis. Diametral tensile strength (DTS), surface roughness before and after toothbrush abrasion, Knoop Hardness (KHN), water sorption and solubility were evaluated. The data were separately analyzed by ANOVA and the Student-Newman-Keuls' tests (p < 0.05). The results of all analyses were material-dependent. Noticeable differences in filler size and shape were detected among the materials. Supreme XT generally showed higher DTS and KHN compared to all the nanohybrids and also showed lower surface roughness before and after toothbrush abrasion compared to most of the materials tested. Similar results were generally detected for the nanohybrids compared with the microhybrid material. In conclusion, the nanohybrid resins generally presented inferior properties compared with the nanofilled composite and either similar or slightly better properties compared to the microhybrid material. Under clinical conditions, nanohybrid resins may not perform similarly to nanofilled materials.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, UFPel, Brazil. moraesrr@gmail.com
authors.forename: Rafael Ratto
authors.initials: RR
authors.lastname: de Moraes
authors.forename: Luciano de Souza
authors.initials: Lde S
authors.lastname: Gonçalves
authors.forename: Ailla Carla
authors.initials: AC
authors.lastname: Lancellotti
authors.forename: Simonides
authors.initials: S
authors.lastname: Consani
authors.forename: Lourenço
authors.initials: L
authors.lastname: Correr-Sobrinho
authors.forename: Mário Alexandre
authors.initials: MA
authors.lastname: Sinhoreti
mesh_terms: D003188:Composite Resins / Q000737:chemistry*; D003793:Dental Restoration, Permanent / Q000379:methods; D003799:Dental Stress Analysis; D006244:Hardness; D008422:Materials Testing; D053761:Nanocomposites; D053758:Nanoparticles; D012995:Solubility; D013499:Surface Properties; D013718:Tensile Strength; D014099:Toothbrushing; D017155:Wettability
chemical_list: D003188:Composite Resins