title: Effect of low shrinkage monomers on physicochemical properties of dental resin composites.
abstract: The aim of this study was to evaluate the effect of low shrinkage monomers on physicochemical properties of dental resin composites. Two low shrinkage resin composites: one with a crosslink branching monomer (Kalore, GC Corp) and a novel monomer (Venus Diamond, Heraeus Kulzer) were compared to a conventional resin composite formulation (Filtek Z250, 3M/ESPE). The volumetric shrinkage was evaluated by µCT analysis (n=5) and the physicochemical properties by degree of C=C conversion (DC), flexural strength (FS) and Young's modulus (YM) (n=10). All samples were light cured by a LED device (Radii, SDI) with 16 J/cm2. The results were analysed by one-way ANOVA and Tukey test for multiple comparisons (α=0.05). No statistical difference was found between µCT shrinkage values to Kalore (1.8%) and Venus Diamond (1.7%) (p≥0.05); Z250 presented statistical highest shrinkage value (2.0%). Kalore presented higher statistical DC (60.8%) than Venus Diamond (49.5%) and Z250 (49.6%). No statistical difference was found between FS or YM properties to Venus Diamond and Z250; Kalore presented statistical lowest FS and YM properties (p≥0.05).
  
  
  CONCLUSIONS
  Using novel monomers seem to reduce polymerization shrinkage without affecting the physicochemical properties evaluated of resin composites rather than using crosslink branching monomers.
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, Universidade Estadual de Campinas, Piracicaba, SP, Brasil.
authors.forename: Dayane Carvalho Ramos Salles
authors.initials: DC
authors.lastname: de Oliveira
authors.affiliation: Department of Dental Radiology, Piracicaba Dental School, Universidade Estadual de Campinas, Piracicaba, SP, Brasil.
authors.forename: Karla
authors.initials: K
authors.lastname: Rovaris
authors.affiliation: Department of Restorative Dentistry, Universidade Estadual de Ponta Grossa, Ponta Grossa, PR, Brasil.
authors.forename: Viviane
authors.initials: V
authors.lastname: Hass
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, Universidade Estadual de Campinas, Piracicaba, SP, Brasil.
authors.forename: Eduardo José
authors.initials: EJ
authors.lastname: Souza-Júnior
authors.affiliation: Department of Dental Radiology, Piracicaba Dental School, Universidade Estadual de Campinas, Piracicaba, SP, Brasil.
authors.forename: Francisco
authors.initials: F
authors.lastname: Haiter-Neto
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, Universidade Estadual de Campinas, Piracicaba, SP, Brasil.
authors.forename: Mario Alexandre Coelho
authors.initials: MA
authors.lastname: Sinhoreti
mesh_terms: D003188:Composite Resins / Q000737:chemistry*; D008422:Materials Testing; D055114:X-Ray Microtomography
chemical_list: D003188:Composite Resins