Special Section Case Report RETENTION Treatment Options Option 1 1. Maxillary fixed appliance 621|126 2. High-pull headgear 12 hours/day with a transpalatal arch 3. When 1 mm overjet is achieved, start using an inclined plane retainer 4. After growth is finished, consider mandibular advancement surgery Option 2 1. Bond brackets on C21|12C for alignment 2. Impressions and deliver splint headgear with an occipital strap 14 hours/day 3. When 1 mm overjet is achieved, switch to anterior inclined bite plane retainer for nights only 4. Monitor transition to permanent dentition. 5. After growth is finished, consider mandibular advancement surgery Option 3 1. No Phase 1 treatment; wait for full permanent dentition 2. Treatment plan for comprehensive orthodontic treatment in combination with orthognathic surgery 3. Remove mandibular first premolars, retract mandibular incisors to increase overjet 4. Mandibular advancement Initial panoramic radiograph and lateral cephalogram Initial Lateral Cephalometric Measurements Variable Norm Pre-Treatment SNA (º) 82.0 85.3 SNB (º) 80.0 74.8 ANB (º) 2.0 10.6 FMA (FH-MP) (º) 25.0 31.2 SN-MP (º) 32.0 38.2 4.0 4.5 104.0 113.3 4.0 11.5 IMPA (L1-MP) (º) 90.0 107.6 Upper Lip-E Line (mm) -4.0 9.5 Lower Lip-E Line (mm) -2.0 11.8 U1-NA (mm) U1-SN (º) L1-NB (mm) Post-treatment description of Case J.K. begins on the next page. Summer 2018 PCSO Bulletin 35