Figure 1. SDH activity of THP-1 monocytes exposed to HEMA and TEGDMA for 7 hrs and measured by the MTT method, with (open circles) and without (solid circles) heat stress at 43°C for 1 hr. Upper-case letters indicate statistical comparisons between concentrations within the no-heat group (ANOVA, Tukey, 
= 0.05). Lower-case letters show statistical comparisons among the heat-stressed groups. Heat-stressed vs. unstressed controls at the highest concentrations of HEMA and TEGDMA exposure were statistically different (two-tailed t test, p = 10-10 for HEMA, 10-7 for TEGDMA).
