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Network structures of Bis-GMA/TEGDMA resins differ in DC, shrinkage-strain, hardness and optical properties as a
Adilson Y Furuse1, José Mondelli, David C Watts
1Master of Science Program in Clinical Dentistry, Department of Dentistry, Positivo University, Rua Professor Pedro Viriato Parigot de Souza, 5300, CEP 81280-330 Curitiba, PR, Brazil. furuseay@yahoo.com.br
Objectives:
To evaluate the influence of different tertiary amines on degree of conversion (DC), shrinkage-strain, shrinkage-strain rate, Knoop microhardness, and color and transmittance stabilities of experimental resins containing BisGMA/TEGDMA (3:1wt), 0.25wt% camphorquinone, 1wt% amine (DMAEMA, CEMA, DMPT, DEPT or DABE). Different light-curing protocols were also evaluated.
Methods:
DC was evaluated with FTIR-ATR and shrinkage-strain with the bonded-disk method. Shrinkage-strain-rate data were obtained from numerical differentiation of shrinkage-strain data with respect to time. Color stability and transmittance were evaluated after different periods of artificial aging, according to ISO 7491:2000. Results were evaluated with ANOVA, Tukey, and Dunnett's T3 tests (α=0.05).
Results:
Studied properties were influenced by amines. DC and shrinkage-strain were maximum at the sequence: CQ
Significance:
The resin containing DMAEMA showed higher DC, shrinkage-strain, shrinkage-strain rate, and microhardness, in addition to better optical properties.
