1. Infection in the oral and maxillofacial region can arise due to a balance between the host's defense system, microbial virulence and quantity, and local circumstances. Common routes of infection include odontogenic, traumatic, hematogenous, and iatrogenic causes. 2. Diagnosis involves identifying local signs like pain, swelling and pus formation as well as systemic symptoms such as fever and lymphadenopathy. Imaging may also be used. 3. Treatment of acute infections focuses on supporting the host's defense system with antibiotics and surgical drainage or incision of abscesses when pus has formed. For chronic infections, surgical removal of the infection source is often needed in addition to antibiotics and drainage.

1. Infection in Oral & Maxillofacial Region

3. Infection---conception Infectious agent(bacteria) Host Inflammatory reaction Elimination the infectious pathogen Repair tissue injury Hypersensitivity Autoimmune disease Beneficial Harmful protective and defensive

6. Anatomy Alveolar bone Soft tissue Fascial space Tooth Caries Pulpitis Apical infection

12. Periapical infection Acute-chronic Periapical infection Fistular Cellulitis Intraoral soft tissue abscess Osteomyelitis Septicemia Deep fascial space infection Ascending facial-cerebral infection

13. Pathways of Periapical infection

14. Pericoronitis Lower third molar

29. Fluctuant examination

31. Infection in masseteric space

32. Infection in multi-space Ludwig’s angina

34. Principles of surgical drainage & incision

37. Thank you