Figure 1 The expression of NLRP3 between groups. (a) The expression percentage of NLRP3 was significantly lower in group H compared to group CP (*P < 0.05). (b) Qualitative evaluation of NLRP3 by using Staining-Intensity-Distribution score. No differences were detected between any of groups (P > 0.05). CP = chronic periodontitis, SID = staining intensity distribution.