Orthodontic Appliances

• advantages:
• 1. removable for social situations
• 2. made in lab rather than by dentist (less chair time)
• disadvantage:
• 1. response to tx heavily depends on patient compliance
• 2. difficult to obtain two-point contacts necessary to produce complex tooth movements

arch expansion and repositioning of individual teeth

one that changes the posture of the mandible, holding it open or forward/open. pressures created by stretch of the muscles and soft tissues move tooth and modify growth.

• fixed:
• 1. bodily translation (removable: tipping only)
• 2. control of root movement
• 3. results less dependent on patient compliance
• 4. less hygienic (well not really and advantage but it's on the study guide...)

• 1st order: horizontal plane
• 2nd order: MD angulation
• 3rd order: Labiolingual angulation