To evaluate the effect of systemic administration of zinc on the gingival crevicular fluid level of total oxidant capacity in controlled Type-2 diabetic patients with stage-II and III periodontitis after non-surgical periodontal therapy.

Hypozincaemia and hyperzincuria is known to be present in patients with type-2 diabetes, and Zinc supplementation is known to be helpful in restoring plasma Zinc levels to normal,Zinc's deficiency can lead to an increase in circulating glucose due to beta cells malfunctioning and resistance to insulin, which makes it easier for type 2 diabetes mellitus (DM2) to happen ,Zinc was found to be a structural part of key anti-oxidant enzymes such as superoxide dismutase (SOD), and Zinc deficiency impaired their synthesis, leading to increased oxidative stress

Inclusion Criteria:

• Controlled Type-2 diabetes mellitus
• Stage-II &III periodontitis
• At least 2 sites with clinical attachment loss 3 or 4 mm to ≥5 mm and radiographic bone loss 15% Extending to mid-third of root and beyond.
• Probing depth from ≤5 mm to ≥6 mm

Exclusion Criteria:

• Any periodontal or Antibiotic treatment during the last six months.
• Receiving trace element supplements in the previous three months
• Pregnant or lactating females
• Gastric or diuretic treatment
• Acute renal failure
• smoking

The outcome assessor and statistician will be blinded to the intervention