NL Journal of Dentistry and Oral Sciences
(ISSN: 3049-1053)

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The Interest of Single-arch Extraction in the Management of Class III Malocclusion: Therapeutic Occlusion

Author(s) : Rabab Zbir*, Hajar Benmohimd, Azaroual F.M, Zaoui Fatima.
DOI : 10.71168/NDO.03.01.144

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Abstract

Introduction: Skeletal Class III is a complex sagittal discrepancy that requires treatment ranging from orthopedics to orthognathic surgery. In cases of moderate malocclusion where patients refuse surgery, dentoalveolar compensation via monomandibular extractions (lower first premolars) represents a specific therapeutic alternative. Case Report: This report describes the case of a 13-year-old female patient presenting with a skeletal Class III due to maxillary retrognathism, associated with an anterior crossbite and mandibular crowding. The treatment plan involved maxillary expansion followed exclusively by the extraction of the mandibular first premolars. Results: The treatment successfully achieved a Class I canine relationship, a functional anterior guide, and harmonious facial aesthetics. The final molar relationship resulted in a functional “therapeutic Class III” occlusion. Particular attention was paid to post-treatment occlusal equilibration including selective grinding, torque adjustments, and deepening of the fossae to ensure long-term stability and prevent occlusal overloading. Conclusion: Monomandibular extraction is an effective compromise for skeletal Class III when clinical indications are strictly followed. Long-term success relies on a rigorous occlusal adjustment protocol to compensate for the reduction in contact points and to ensure optimal functional stability. Keywords: Class III malocclusion, Orthodontic compensation, Therapeutic occlusion, Occlusal equilibration.

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