Figure 8.

Vickers surface microhardness (VHN) after immersion in deionized water for 24 h. The boxes represent the first quartile (Q1) to the third quartile (Q3), the horizontal line in the boxes represents the median, the whiskers represent the maximum and minimum values, and “+” represents the mean value (n = 5). The same letters represent p < 0.05 of the data compared within the same materials at 24 h and 4 weeks. The dashed and solid lines with stars indicated p < 0.05 of data compared among different materials at 24 h and 4 weeks, respectively.