|Support type:||Scholarships in Brazil - Scientific Initiation|
|Effective date (Start):||June 01, 2008|
|Effective date (End):||May 31, 2009|
|Field of knowledge:||Health Sciences - Dentistry - Dental Materials|
|Principal Investigator:||Raphael Freitas de Souza|
|Grantee:||Ana Paula Zanini|
|Home Institution:||Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil|
The incorporation of an antiseptic agent into denture bases has a great preventive potential against that accumulation. However, active sites in the resulting copolymer might present greater affinity to water and staining agents. The aim of this project is to evaluate the incorporation of an antiseptic monomer in a heat-polymerized acrylic resin and its effect over color stability after immersion in different solutions. The tested compound will be the methacryloyloxyundecylpyridinium bromide (MUPB), which can copolymerize with conventional acrylic resins. Tests will be conducted over a heat-polymerized acrylic resin incorporating 4 concentrations of MUPB (0, 0.15, 0.3 or 0.6 %, mass). Specimens will be immersed in distilled water, coffee or red wine during 36 days, and color changes (E) will be evaluated by a portable spectrophotometer (Color Guide 45/0; BYK-Gardner Latin America, Santo André, SP). E will be compared among concentrations and solution by means of 2-way ANOVA followed by Tukey HSD test (±=.05).