It is an overview of classification, diagnosis, and treatment of partially edentulous arches in prosthodontics. It highlights the purpose of classification systems-to aid treatment planning, communication, and denture design-and reviews many systems, from early ones like Cummer's and Kennedy's (the most widely used, refined by Applegate's rules), to others such as Bailyn, Neurohr, Mauk, Wild, Godfrey, Beckett & Wilson, and the modern ACP classification. Treatment options range from removable partial dentures (RPDs) and fixed bridges to overdentures and implants, depending on the patient's...