Figure 2.

(a) Mean and standard error (SE) of the first-cycle indentation distance (ID) of root canal dentin exposed to various treatments and a no-treatment control group. Different upper-case letters represent a significant difference. (b) Mean and SE of estimated hardness of intact root canal dentin exposed to various treatments and a no-treatment control group. Different upper-case letters represent a significant difference. (c) Mean and SE of ID increase of intact root canal dentin exposed to various treatments and a no-treatment control group. Different upper-case letters represent a significant difference. (d) Mean and SE of Total ID of intact root canal dentin exposed to various treatments and a no-treatment control group. Different upper-case letters represent a significant difference. (e) Mean and SE of Vickers microhardness of polished radicular dentin exposed to various treatments and a no-treatment control group. Different upper-case letters represent a significant difference