Figure 3From: Pro-oxidant status and matrix metalloproteinases in apical lesions and gingival crevicular fluid as potential biomarkers for asymptomatic apical periodontitis and endodontic treatment responseActivity levels of MMP-9 (A) and MMP-2 (B) in apical lesions and healthy periodontal ligament. PDL: Healthy periodontal ligament; proMMP-9 and proMMP-2: proenzyme forms; aMMP-9 and aMMP-2: Active enzyme forms. *p < 0.05.Back to article page