The demand for orthodontic treatment among adults has increased substantially, with periodontal disease posing a significant challenge to successful outcomes. This manuscript reviews and synthesizes existing classification systems for assessing periodontal risk in the context of adult orthodontics, focusing on the Ortho-Perio Risk Assessment (OPRA) and the 2017 American Academy of Periodontology/European Federation of Periodontology (AAP/EFP) staging and grading framework for periodontitis. The OPRA provides guidance on timing orthodontic intervention based on periodontal status, while the AAP/EFP system categorizes disease severity, extent, and progression rate. Limitations of these systems when applied independently to orthodontic cases include inadequate integration of orthodontic-specific factors such as force application and tooth movement dynamics. To address this, a novel unified classification framework is proposed, incorporating elements from both systems into an orthodontic-specific risk matrix stratified into low, medium, and high risk categories. This matrix considers parameters like clinical attachment loss, bone loss, progression grade, systemic modifiers, and orthodontic complexity. A clinical decision flowchart is outlined to facilitate interdisciplinary planning. This synthesis aims to improve risk stratification, enhance treatment predictability, and support evidence-based management in adult orthodontic patients with periodontal involvement.
