Pulp necrosis and Calcification Diseases of periapical area Dental granuloma, abscess, alveolar osteitis. Osteomyelitis (acute and chronic). Odontogenic cysts. Classification, inflammatory odontogenic cysts. Developmental odontogenic cysts Soft tissue cysts Odontogenic tumors. Classification, epithelial odontogenic tumors. Mesenchymal and mixed odontogenic tumors