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Complete denture hygiene solutions - adverse effects on heat-polymerized acrylic resin

Grant number: 11/22898-3
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): March 01, 2012
Effective date (End): December 31, 2012
Field of knowledge:Health Sciences - Dentistry
Principal Investigator:Helena de Freitas Oliveira Paranhos
Grantee:Carolina Noronha Ferraz de Arruda
Home Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil


The aim of this study was to evaluate the effect of denture cleansers solutions (Alkaline (hypochlorite and Alkaline peroxides)on the properties of color, flexural strength and surface roughness of a thermally activated acrylic resin. For the experiment, 120 specimens thermally activated acrylic resin (Lucitone 550)will be made, with 60 circular for testing color change and 60 rectangular for testing surface roughness and flexural strength.Circular metal matrix (analysis of color change) and rectangular (analysis of surface roughness and flexural strength) will be included in conventional flasks and the acrylic resin will be handled, pressed and cured according to manufacturers' instructions. After divestment, the specimens obtained will be finished (micromotor, milling and sanding water) polished (pumice and diamond paste) and immersed for 20 minutes in the solutions: 1) Control 1 (no water), 2) control 2 (distilled water), 3) Corega Tabs effervescent tablet, 4) sodium Hypochlorite 0.5%. The immersions simulate daily hygiene of 05 years (1825 days). Before and after the immersion, the specimens will be evaluated for color change through spectrocolorimeter (Color Guide 45/0) and correlation of data according to NBS units, for surface roughness (surface analyzer Surftest SJ-201P) and flexural strength (Universal Testing machine DL 2000, EMIC)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
CAROLINA NORONHA FERRAZ ARRUDA; DANILO BALERO SORGINI; VIVIANE DE CÁSSIA OLIVEIRA; ANA PAULA MACEDO; CLÁUDIA HELENA SILVA LOVATO; HELENA DE FREITAS OLIVEIRA PARANHOS. Effects of Denture Cleansers on Heat-Polymerized Acrylic Resin: A Five-Year-Simulated Period of Use. Brazilian Dental Journal, v. 26, n. 4, p. 404-408, Ago. 2015.

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