Comprehensive Management of Skeletal Class II Division 1 Malocclusion with Bilateral Crossbite using Haas Expander and Forsus^TM FRD: A Case Report

1. Postgraduate Student, Department of Orthodontics and Dentofacial Orthopaedics, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, Maharashtra, India. 2. Postgraduate Student, Department of Orthodontics and Dentofacial Orthopaedics, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, Maharashtra, India. 3. Professor, Department of Orthodontics and Dentofacial Orthopaedics, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, Maharashtra, India. 4. Professor and Head, Department of Orthodontics and Dentofacial Orthopaedics, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, Maharashtra, India. 5. Postgraduate Student, Department of Orthodontics and Dentofacial Orthopaedics, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, Maharashtra, India.

Abstract

Skeletal Class II malocclusion is a jaw discrepancy where the mandible is retruded relative to the maxilla, leading to a convex profile, increased overjet, and potential deep bite. It may result from mandibular deficiency, maxillary excess, or both. This case report details the comprehensive management of a 19-year-old male patient with a Class II Division 1 malocclusion, characterised by an orthognathic maxilla, retrognathic mandible, increased overjet and overbite, and a convex facial profile. The treatment involved fixed orthodontic therapy using the McLaughlin-Bennett-Trevisi (MBT) 0.022” prescription for comprehensive tooth alignment and leveling. Maxillary expansion was achieved using a Haas expander, a tooth- and tissue-borne appliance designed to widen the upper arch. Class-II correction was carried out with the ForsusTM Fatigue Resistant Device (FRD), a Fixed Functional Appliance (FFA) that applies continuous force to advance the mandible and correct the sagittal jaw discrepancy. Following two years of active treatment, the patient achieved a well-aligned dentition, a Class I molar and canine relationship, and an improved facial profile. This case highlights the efficacy of FFAs in the non-extraction management of Class II malocclusion, demonstrating favourable dentoalveolar and soft-tissue changes.

Convex profile, Functional appliance, Jaw discrepancy, Molar relationship