Treatment of Skeletal Class II Protrusion with Gummy Smile Using a Antero-Posterior Lingual Retractor
Hobeen Yu, Hyo-Won Ahn
Department of Orthodontics, School of Dentistry, Kyung Hee University, Seoul, Korea
In this case report, we present the application of antero-posterior lingual retractor (APLR) for a protrusion and gummy smile case which needs anterior torque control and intrusion of anterior teeth. After total 24 months of treatment, the superimposition between pretreatment and post-treatment showed slight proclination of the maxillary incisiors (FH-U1 angle, from 111.5o to 117.5o ) during 3.0 mm intrusion and 5.0 mm retraction of the incisal edge. The maxillary molars were intruded up to 0.5 mm, which was followed by autorotation of the mandible (mandibular plane to FH angle, from 35.3o to 34.6o ) with 1.0 mm advancement of pogonion. The APLR system produced excellent and efficient retraction with good torque control and significant intrusion of the anterior segment. This system approach would be an effective option for skeletal Class II with the bialveolar protrusion and gummy smile patient.
Key words: Anterior-posterior lingual retractor, Gummy smile, lip protrusion, Torque control, Vertical control
Korean J Lingual Orthod 2018;7(1):18-24