Evaluation of the Effect of Intra-ligamentary Injection of Diclofenac Potassium Versus Articaine on Anaesthetic Efficacy in Mandibular Molars With Symptomatic Irreversible Pulpitis.

Inclusion Criteria: * Systemically healthy patient (ASA I or II). * Mandibular Posterior teeth with: Preoperative sharp pain, Absence or slight widening in the periodontal ligament (PDL), Vital response of pulp tissue to cold pulp test. * patients who agree to provide written consent and the patients able to understand the pain scale and attend for recall appointments Exclusion Criteria: 1. Patients allergic to anesthetic solutions \& other NSAIDs. 2. Pregnant or nursing females. 3. Patients having significant systemic disorder (ASA III or IV). 4. Gastrointestinal disorders. 5. If the initial diagnosis revealed pain in more than one tooth. 6. Hemostatic disorders or anti-coagulant therapy during the last month. 7. Consumption of opioid or non-opioid analgesics or NSAIDs during the last 12 hours before treatment. 8. Teeth that have: i. Periodontal involvement (with pocket depth greater than 5mm, associated with swelling or fistulous tract, or greater than grade I mobility). ii. No possible restorability. iii.Signs of pulpal necrosis; associated sinus tract or swelling. \-