Mandibular retrognathia correction using a fixed sagittal guidance appliance individually manufactured by selective laser melting manufacturing technology

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Abstract
Purpose: Digitalization and additive manufacturing now play an important role in the manufacturing of medical and dental products. The purpose of this paper is to present the results of the treatment of skeletal Class II malocclusion in a growing patient using fixed sagittal guidance (FSG) appliance manufactured by digital and fast procedure by selective laser melting. Design/methodology/Approach: This study present the case of a 14-year-old boy with a convex profile owing to a retrognathic mandible, an overjet (8 mm), a deep overbite (7 mm), a Class II canine, a molar relationship on both sides and an accentuated lower curve of Spee. The lateral cephalogram showed a skeletal Class II discrepancy with mandibular retrognathia, skeletal deep bite, reduced lower anterior facial height and proclined upper incisors. Treatment using FSG and fixed orthodontic appliance was performed within 15 months. Findings: The final results show a well-balanced face and a nice profile. Protrusion of the maxillary anterior teeth was corrected, and a Class I molar relationship was achieved with proper overjet and overbite. Research limitations/implications: The results from the proposed method are promising, although long-term results with a large group are not yet available. Practical implications: Using an individually made FSG appliance from biocompatible material and an individualized treatment plan, an effective result in treating Class II malocclusion due to retrognathic mandible with favorable dentofacial effects has been achieved. Originality/value: This is the first paper describing the use of additive manufacturing for orthodontic appliances in Slovenia.

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