To compare the effect of 1% melatonin gel versus calcium hydroxide as intra canal medication in necrotic mandibular premolars on: * Intensity of postoperative pain. * Bacterial load reduction. * Periapical (MMP-9) level.
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Intensity of postoperative pain
Timeframe: up to 48 hours