Influence of Occlusal Reduction on Endodontic Postoperative Pain

Inclusion Criteria: 1. Systemically healthy subjects (ASA I\&II) between the age of 18 and 70 years 2. Patients diagnosed with necrotic pulp or previously initiated (accessed). 3. Posterior maxillary or mandibular molar tooth. 4. Presence of an opposing tooth (or teeth) with normal occlusal contact with the opposing tooth (or teeth). 5. Tooth needs cuspal coverage. Exclusion Criteria: 1. Pregnant females. 2. Patients with significant medical conditions (ASA III \& IV). 3. Reported bruxism or clenching. 4. Took analgesics\\antibiotics or other drugs that might alter their pain during the last 12 hours preoperatively. 5. A history of allergic reactions to any of the medications and/or materials used. 6. Patients with a tooth that had no contacts or premature contact, fewer than three teeth on one side of the jaw. 7. Greater than grade I mobility or pocket depth greater than 5mm. 8. Non-restorable crowns, severely curved root canals, or post-treatment endodontic disease were, also, excluded.