Suresh, R2025-09-242025-09-242014https://hdl.handle.net/20.500.14572/2324Suresh R Department of Orthodontic Adhi Parasakthi Dental College and Hospital Melmaruvathur, Tamilnadu, IndiaABSTRACT This article describes the management of class III subdivision malocclusion with unilateral left side posterior crossbite in an adolescent girl, using rapid palatal expansion followed by extraction of four premolars with comprehensive fixed appliance mechanotherapy. KEY WORDS Class III subdivision, posterior crossbite, rapid palatal expansion, second premolar extractionen-USClass III subdivisionPosterior crossbiteRapid palatal expansionSecond premolar extractionArticle