Effect of diphenyliodonium hexafluorphosphate on resin cements containing different concentrations of ethyl 4-(dimethylamino)benzoate and 2-(dimethylamino)ethyl methacrylate as co-initiators. Issue 6 (June 2016)

• Record Type: Journal Article
• Authors: Andrade, Kamila Menezes Guedes de; Palialol, Alan Rodrigo; Lancellotti, Ailla C.; Aguiar, Flávio Henrique Baggio; Watts, David C.; Gonçalves, Luciano Souza; Lima, Adriano Fonseca; Marchi, Giselle Maria
• Is Part Of: Dental materials. Volume 32:Issue 6(2016)
• Page Start: 749
• Page End: 755
• Publication Date: 2016-06
• Subjects: Degree of conversion -- Flexural modulus -- Mechanical properties; Dentistry -- Periodicals; Dental materials -- Periodicals; 617.695
• DOI: 10.1016/j.dental.2016.03.014
• Languages: English
• ISSNs: 0109-5641

Abstract

Highlights: Both amines (EDAB and DMAEMA) can be used combined with DPI in resin formulations. Resin cements using DMAEMA as co-initiator has the properties improved by use of DPI. EDAB seems to be the best amine to be used in resin cements with or without DPI. Abstract: Objective: The present study evaluated the influence of diphenyliodonium hexafluorphosphate (DPI) combined with two different amines [ethyl 4-(dimethylamino)benzoate (EDAB) and 2-(dimethylamino)ethyl methacrylate (DMAEMA)] on the properties of model resin cements. Methods: A comonomer base containing a 1:1 mass ratio of 2.2-bis[4-(2-hydroxy-3-methacryloxypropoxy)phenyl]propane (bis-GMA) and triethyleneglycol dimethacrylate (TEGDMA) was obtained, after which 1 mol% of camphorquinone and 0.1 mol% of hydroxyl butyl toluene were added to the comonomer blend. Concentrations of co-initiators varied at 0, 0.5 or 1 mol% for DPI and in 1 or 2 mol% for amines (DMAEMA or EDAB). Silanated Ba-Al-Si glass (60 wt%) was added as filler. The combination of each amine and DPI concentration resulted in 12 formulations, which had the following properties analyzed: degree of conversion (DC), water sorption ( W sp ) and solubility ( W sl ), flexural strength (FS) and flexural modulus ( E f ). Data for DC, FS and E f were analyzed by two-way ANOVA and Tukey's test ( α = 0.05) and W sp and W sl by Kruskal–Wallis and Dunn tests ( α = 0.05). Results: EDAB promoted a higher DC than did DMAEMA; however, DPI increased DC for all materials with DMAEMA. The physical properties of resin formulations containing EDAB were significantly better than those of groups with DMAEMA; however, DPI had a positive influence on the chemical and physical properties of the model resin cement containing DMAEMA, especially with higher concentrations of amine. Significance: EDAB proved to be more reactive than DMAEMA, being less influenced by DPI. Resins containing a 1:2 CQ/amine ratio had better properties than those with 1:1.