title: Evaluation of diametral tensile strength and Knoop microhardness of five nanofilled composites in dentin and enamel shades.
abstract: The purpose of this study was to evaluate and compare the mechanical behavior of five nanofilled composites with dentin and enamel shades trough diametral tensile strength and knoop microhardness. 4 Seasons (Ivoclar Vivadent), Esthet X improved (Dentsply), Filtek Supreme (3M), Grandio (Voco) and Palfique Estelite (Tokuyama Dental Corp.) were used in this research. Twenty samples (6 mm diameter and 3 mm thickness) of each material were used. Ten samples were submitted to knoop microhardness and the others to diametral tensile strength examinations. The results were submitted to ANOVA and Tukey statistical tests (a=0.05). There were significant differences between the tested groups (p<0.05). The diametral tensile strength ranged from 36.08 (4 Seansons dentin) to 49.24 (Grandio enamel). The knoop microhardness ranged from 54.45 (Esthet X improved enamel) to 123.90 (Grandio dentin). A great variability in the mechanical behavior of the nanofilled composites was observed. However it was not recorded with dentin and enamel shades with the exception of Grandio.
authors.affiliation: Pontifical Catholic University of Rio Grande do Sul, Brazil. eduardo.mota@pucrs.br
authors.forename: Eduardo Gonçalves
authors.initials: EG
authors.lastname: Mota
authors.forename: Hugo Mitsuo Silva
authors.initials: HM
authors.lastname: Oshima
authors.forename: Luiz Henrique
authors.initials: LH
authors.lastname: Burnett
authors.forename: Luiz Antonio Gaieski
authors.initials: LA
authors.lastname: Pires
authors.forename: Rogério Simões
authors.initials: RS
authors.lastname: Rosa
mesh_terms: D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003743:Dental Enamel; D003764:Dental Materials / Q000737:chemistry*; D003804:Dentin; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D053758:Nanoparticles / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D003188:Composite Resins; D003764:Dental Materials; C466112:Esthet-X; C474035:Filtek Supreme; C509998:Grandio; C111840:flowable hybrid composite; C086113:palfique estelite