The Invisalign system is not just a set of aligners, as other resources are needed to achieve success in each case. Based on this, we describe five pillars of the technique, which are:

• Aligners
• ClinCheck software
• Attachments and features of SmartForce
• Auxiliary techniques
• Technicians

9.1 Aligners

Aligners are made from SmartTrack material, a patented plastic formula exclusively designed this purpose, while attachment templates are made with EX 15 and Vivera retainers with EX 40.

Characteristics of the SmartTrack technology:¹

• Creates a soft and constant force.
• Is more elastic than other aligner materials, which results in a longer working period.
• Better adjustment to the teeth than any other alternative.
• Easier to use and provides an easier way of placing and removing the aligner.

Every aligner makes:

• 0.25 mm of lineal movement
• 2 degrees of angular movement to correct rotations
• 1 degree of torque movement (lingual–root torque or labial–root torque)