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. 2015 Apr 23;3:e868. doi: 10.7717/peerj.868

Figure 4. Mechanical properties of PMMA resin with or without NAC.

Figure 4

Data are presented as the mean ± SD. Values with different superscripts are significantly different from each other (One-way ANOVA, p < 0.05). (A) The flexural strength (FS) of specimens in various subgroups after 24 h (n = 12). (B) Microhardness value (VHN) after 24 h (n = 15). (C) Surface roughness (Ra) of the specimens (n = 3). (D) The SEM image of the fractured surfaces for each subgroup. Pit-like internal defects can be observed for subgroup with NAC (arrows).