Pathogenic Interplay Between Diabetes Mellitus and Periodontal Disease

Abstract

Diabetes mellitus and periodontal disease are both chronic inflammatory conditions that are intertwined with a bidirectional, well-observed association. More evidence is emerging by which metabolic dysregulation in diabetes exacerbates periodontal tissue homeostasis, and that periodontal inflammation will also worsen systemic glycaemic control. Clarification of the molecular and immunological processes underlying this relationship is needed to offer improved medical and dental management. This review addresses the epidemiological and mechanistic relationships between periodontal disease and diabetes, with a focus on immune dysregulation, action of pro-inflammatory cytokines, development and influence of advanced glycation end-products (AGEs) and their receptors (RAGEs). It also identifies the clinical implications of concurrent patient management. A detailed literature review was performed using the assistance of MEDLINE and PubMed databases to scan for appropriate studies between 1990 and 2025. Experimental and clinical data were both evaluated to identify the manner in which immune dysfunction resulting from hyperglycaemia contributes to periodontal tissue breakdown. Epidemiological data have substantiated enhanced risk and severity of periodontitis in diabetes in a number of populations. Hyperglycaemia impairs the function of neutrophils and macrophages, enabling poor bacterial clearance and increased production of inflammatory cytokines, specifically TNF-α, IL-1β, and IL-6. Concurrently, AGEs develop in diabetic tissues and trigger RAGE on numerous cell types and promote oxidative stress and inflammation through NF-κB and JAK/STAT signaling. These alterations facilitate periodontal deterioration and further jeopardize glycaemic control. A two-way interaction between periodontal disease and diabetes is supported by shared pathogenic processes including dysregulation of the immune system and chronic inflammation.