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(A) The acrylic-splint Herbst appliance. (B) Rapid maxillary expander adapted to the Herbst appliance. (C) Cephalometric tracing: 1. SNA; 2. SNB; 3. Co-A; 4. Co-Gn; 5. ANB; 6. A1-PNS; 7. posterior airway space; 8. tongue length; 9. tongue height; 10. H-MP (hyoid bone to mandibular plane); 11. H-H1 (hyoid bone to Sinf-C3 plane); 12. H-C3 (linear distance between hyoid bone and C3); and 13. H-Sinf (linear distance between hyoid bone and Sinf).
