THE EFFECT OF COMONOMER COMPOSITION, SILANE HEATING, AND FILLER TYPE ON AQUEOUS TEGDMA LEACHABILITY IN MODEL RESIN COMPOSITES

Experimental composites using either bisGMA/TEGDMA or UEDMA/TEGDMA mat rices, quartz or barium glass fillers, and 2 different filler silaniza tion methods were evaluated regarding monomer leachability in distille d water. The leached amount was detected and quantified using gas chro matography. The results showed that twice as much TEGDMA is leached fr om a bisGMA/TEGDMA based composite than from an UEDMA/TEGDMA based com posite, when both contain 50 wt% TEGDMA. The hypothesis suggested that the higher degree of curl of UEDMA/TEGDMA based composites would be r eflected in a lower monomer leaching value, and this hypothesis was su pported by the findings. Whether such a correlation exists within grou ps of UEDMA/TEGDMA based matrices having different degrees of cure was not determined and needs to be investigated in future studies. Variab les such as filler composition and silane treatment did not affect the leaching values of TEGDMA in water. That finding suggests that future studies should target differences in matrices, and that the need for considering effects of filler composition and silane treatment methods should not receive the same priority.