The biophysical system.
D000539:Alveolar Process / Q000502:physiology; D006801:Humans; D009068:Movement; D009967:Orthodontic Appliances; D010513:Periodontal Ligament / Q000502:physiology; D012399:Rotation; D014070:Tooth / Q000502:physiology; D014087:Tooth Movement Techniques / Q000295:instrumentation