Effect of Diphenyliodonium Hexafluorphosphate on Resin Cements Containing Different Concentrations of Ethyl 4-(dimethylamino)benzoate and 2-(dimethylamino)ethyl Methacrylate as Co-Initiators

Kamila Menezes Guedes de Andrade, Alan Rodrigo Palialol, Ailla C Lancellotti, Flávio Henrique Baggio Aguiar, David C Watts, Luciano Souza Gonçalves, Adriano Fonseca Lima, Giselle Maria Marchi

Dent Mater. 2016 Jun;32(6):749-55.

PMID: 27056595

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 1mol% of camphorquinone and 0.1mol% of hydroxyl butyl toluene were added to the comonomer blend. Concentrations of co-initiators varied at 0, 0.5 or 1mol% for DPI and in 1 or 2mol% for amines (DMAEMA or EDAB). Silanated Ba-Al-Si glass (60wt%) 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 (Wsp) and solubility (Wsl), flexural strength (FS) and flexural modulus (Ef). Data for DC, FS and Ef were analyzed by two-way ANOVA and Tukey's test (α=0.05) and Wsp and Wsl 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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP10287533	Ethyl 4-(dimethylamino)benzoate		10287-53-3	Price