Influence of different amines in a ternary radical photoinitiator system in experimental resin cements containing onium salt

Author(s)

Kamila Menezes Guedes de Andrade

• Document type: Master's Dissertation
• Press: Piracicaba, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba
• Defense date: 2012-10-12

Examining board members

Giselle Maria Marchi; Maria Cecília Caldas Giorgi; Marcelo Tavares de Oliveira

• Advisor: Giselle Maria Marchi

Abstract

The goal of this study was to evaluate the influence of the addition of different concentrations of diphenyliodonium hexafluorophosphate (DPI) on the properties of photoactivaed experimental resin cements containing dimethylaminoethil methacrylate (DMAEMA) and dimethylaminoethil benzoate (EDAB) in different concentrations. To the Bis-GMA/TEGDMA comonomer blend (1:1 in weight) was added 1 mol% of the photoinitiator camphorquinone (CQ) and 0,1 mol% of the inhibitor hydroxyl butyl toluene (BHT). The addition of the co-initiators varied in 0, 0,5 and 1 mol% of DPI; 1 and 2 mol% of DMAEMA; 1 and 2 mol% of EDAB. Each amine concentration was combined to each salt concentration in 12 experimental groups. After the manipulation of the resin matrix, 60% in weight of inorganic sillanated particles of Ba-Al-Si glass were added. The analysed properties were sorption (SR) and solubility (SL) in distilled water (n=5); Flexural strength (FS) and elasticity modulus (E) (n=10) and degree of conversion (DC) (n=5). The statistical analysis was done with significance of 5% to each test separately. The results showed that the addition of different concentrations of DPI, DMAEMA and EDAB had an influence on all the tested properties. Formulations containing 1 mol% of DMAEMA were more sensitive to the addition of 0,5 mol% of DPI, presenting an increase on DC, RF, E and decrease on SR. The addition of 1 mol% of DPI increased the SR, the E and decreased the SL and the DC. Cements containing 2 mol% of DMAEMA presented increase on DC, FS and E with the addition of 0,5 mol% of DPI and minor values of SL. The amine EDAB 1 mol % was influenced by the two concentrations of DFI with gradual increase of the SR and increase of the DC. The concentration of 2 mol% of EDAB was little influenced by the addition of the salt. In conclusion, the addition of the DPI improves the cements containing DMAEMA in a more significant way than the cements containing EDAB. Formulations with 2 mol% of the amines are more stable to most of the realized tests (AU)

• FAPESP's process: 11/04513-7 - Influence of different tertiary amines in a ternary radical photoinitiator system in a resin cement containing diphenyliodonium salt
• Grantee: Kamila Menezes Guedes de Andrade
• Support Opportunities: Scholarships in Brazil - Master