Pre-operative Aceclofenac on the Anesthetic Efficacy of IANB in Symptomatic Irreversible Pulpitis

Inclusion Criteria: * Patients in good health (American Society of Anesthesiologists Class I or Class II). * Patients having symptomatic irreversible pulpitis in one of their mandibular molars * Age is 18 years or older. * Patients who can understand Heft- Parker Visual Analogue Scales. * Patients able to sign informed consent. Exclusion Criteria: * Patients allergic to aceclofenac or Mepivacaine. * Pregnant or nursing women. * Patients having active pain in more than one molar in the same quadrant. * Administration of analgesics within 12 h before the administration of the study drug.