Postoperative Pain After Dexamethasone Injection by Two Techniques in Irreversible Pulpitis

The aim of this randomized clinical trial to evaluate the effect of dexamethasone in two different techniques on postoperative pain by dividing patients randomly into three groups: * Group I: buccinator injection of dexamethasone. * Group II: buccal infiltration of dexamethasone. * Group III (Control): IANB using local anesthesia only post operative pain will be evaluated subjectively by patients by VAS score after procedure immediately and follow up for 12, 24 and 72 hours and frequency of analgesic intake

Inclusion Criteria: * Both genders * Older than age of (18 to 60) years * Participants willing to commit for the entire period of the trial and agreed to sign the written consent after full explanation of the study * Having a mandibular molar tooth with vital pulp * These patients were also suffering from symptomatic irreversible pulpitis ,intermittent or continuous sharp pain that lasts longer after removal of the stimulus * Patients with moderate to severe symptoms VAS≥4 Exclusion Criteria: * Vulnerable group; pregnant females, mentally ill and diseased patientsetc.… * Patients irritable to local anesthesia * Patients who are supposed to take plain anesthesia * Use of analgesic or antibiotic within 6 hours before the visit * Absence of bleeding in the pulp chamber during cavity preparation * Severe periodontal disease b- Patients' randomization, allocation and blinding: