|Support type:||Scholarships in Brazil - Master|
|Effective date (Start):||September 01, 2012|
|Effective date (End):||January 31, 2014|
|Field of knowledge:||Health Sciences - Dentistry - Dental Materials|
|Principal Investigator:||Daniela Micheline dos Santos|
|Grantee:||Agda Marobo Andreotti|
|Home Institution:||Faculdade de Odontologia (FOA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil|
The ocular absence implies on difficulties to establish social and affective ties; functional, emotional, personal and social disorders, and loss of aesthetic balance. A safe, aesthetic and satisfactory alternative to rehab patients with this deformity is the use of ocular prosthesis. It is very important to know about the physical and mechanical properties of the materials used on the prosthesis production. Nanoparticles have been added to the acrylic resins polymeric chain in order to improve these properties. So, this study aims to assess the influence of nanoparticles addition on the color stability, microhardness, and flexural resistance of artificial sclera N1 acrylic resin. To this purpose, 300 samples will be made and divided into 10 groups, according to the kind of opacifier associated to the artificial sclera N1 acrylic resin: control - without opacifier (C); zinc opacifier 1% (OZ1) ; zinc opacifier 2% (OZ2); zinc opacifier 2,5% (OZ2,5); titanium opacifier 1% (OT1); titanium opacifier 2% (OT2); titanium opacifier 2,5% (OT2,5); barium opacifier 1% (OB1); barium opacifier2% (OB2); barium opacifier2,5% (OB2,5). The specific samples to color and microhardness tests will have the dimension of 45 x 2mm (n=10); and the specific ones to flexural resistance test, will have the dimension of 64 x 10 x 3.3 mm (n=20). The color stability, microhardness and flexural strength tests will be realized before and after 1008 hours of accelerated aging. The color stability tests will be made through reflection spectrophotometry and the superficial microhardness will be measured by a hardness meter. The flexural strength will be measured through the EMIC, according to the three-point technique. Data will be submitted to the test of adherence to the normal curve, and appropriate statistical test will be applied.