title: Microstructural characterization and evaluation of the properties of polymeric materials for maxillofacial prosthetics.
abstract: This study evaluated the Shore A hardness, colour and microstructural alterations of an experimental silicone for maxillofacial prostheses. As a control, the MDX 4-4210 silicone was used. Eighty specimens of each material were randomly divided into groups of pigmentation and ageing. For microstructural analysis by Thermogravimetry, Fourier Transform Infrared Spectroscopy and Differential Scanning Calorimetry, three specimens of each group were used. Anova and Tukey test (p < 0.05) was used in statistical analysis. There was significant difference in hardness depending on the materials, pigmentation and ageing and interaction between all the factors evaluated (p = 0.00). The colour change was significant due to ageing (p = 0.00) and the interaction between the factors evaluated (p = 0.00). The microstructural analyses have shown that ageing methods and pigmentations did not cause structural alterations. The results suggest that the alterations in hardness and colour do not represent important structural changes.
authors.affiliation: Department of Dental Materials and Prosthodontics , Ribeirão Preto Dental School, University of São Paulo , Ribeirao Preto , Brazil.
authors.forename: Juliana Barchelli
authors.initials: JB
authors.lastname: Pinheiro
authors.forename: Andréa Cândido
authors.initials: AC
authors.lastname: Reis
authors.forename: Marina Xavier
authors.initials: MX
authors.lastname: Pisani
authors.forename: Vanessa Maria Fagundes
authors.initials: VM
authors.lastname: Leite
authors.forename: Raphael Freitas
authors.initials: RF
authors.lastname: Souza
authors.forename: Helena Freitas Oliveira
authors.initials: HF
authors.lastname: Paranhos
authors.forename: Silva-Lovato
authors.initials: SL
authors.lastname: Cláudia Helena
mesh_terms: D003116:Color; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D008422:Materials Testing / Q000379:methods*; D008447:Maxillofacial Prosthesis; D012826:Silicone Elastomers / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry
chemical_list: D004129:Dimethylpolysiloxanes; C020964:MDX 4-4210; D012826:Silicone Elastomers