Join me as I summaries John Morton’s lecture from this year’s Invisalign Aligner Summit
John Morton, director of research and technology for Align describes G8 with invisalign
Introduction:
How to aligners move
- Force driven system: Shape of the appliances derived from the force desired to be delivered
- Displacement driven system – Shape of the appliance is the location of the tooth in the desired position, no concept of force being applied
Invisalign system
- Smartforce features
- Control the position of the crown relative to the roots
- SmartTrack material
- Control movement of the teeth applying the force
- Smartstage technology
- Progression of tooth movements
- Coordination of arches
- Which tooth moves 1st etc – G8
G8 change in contour of the aligner and the tooth surface
- Smartforce feature: – Optimised attachment
- Temporary change to shape of the tooth with composite
- Aligner to contact tooth surface to produce a force in the direction of desired movement
- Large flat surface Vs conventional attachment (sloped surface)
- Reliable that aligner will contact the surface – we can measure it
- Where to put attachment
- What is the direction of the force
- What is the magnitude (measured by being perpendicular)
- Reliable that aligner will contact the surface – we can measure it
- Mismatch of tooth shape and aligner formation
- Small mismatch = flex of aligner
- Large mismatch = bowing of aligner labially = large force
G8
- Improve efficiency
- Smartforce activation
- Changes contact of the aligner with tooth surface
- Control contact points = control force, magnitude and direction
- Examples
- Intrusion
- Expansion
- Changes contact of the aligner with tooth surface
Intrusion for deep bite with G8
- 2N force on each tooth to predictably deliver intrusion for deep bites
- Displacement driven system = – each tooth receives the same activation, however different forces are generated
- G8 delivers different activation / mismatch tooth Vs aligner = same force levels on teeth being intruded
