What causes chronic periapical inflammation?

Chronic periapical inflammation is primarily caused by persistent infection or irritation at the apex of a tooth root, often resulting from untreated dental caries, trauma, or previous dental procedures. The inflammation is typically associated with the presence of necrotic pulp tissue, which leads to a bacterial infection that triggers an immune response. Factors such as poor oral hygiene, systemic health issues, and anatomical variations can also contribute to the development of chronic periapical conditions. Over time, this inflammation may lead to the formation of periapical lesions, such as granulomas or cysts.