This protocol, popularized by the doctor Arturo Vela, is based on the classical principles of flattening the Spee curve: Space Search (by protilizing the incisors) and a mixture of relative and pure intrusion that is determined by the patient's initial situation.
In any case, We must understand that it is an acronym that describes the sequence in which the lower incisors move in this malocclusion:
- Pro-tilting of the crowns, usually without associating it with root movement (although this will occur, To lingual, in the opposite way to that of the crown)
- Incisors intrusion, after having made space for this movement (It is accepted that 2.5mm of arch space is needed for every 1mm of curve flattening)
- Retrusion of the incisors to close the remaining spaces, if there are any, adding in this case 1 Degree of lingual radiculus torque per aligner to provide coronal and root movement
In certain cases, the phases 2 and 3 (GO) are performed simultaneously, depending on the total number of aligners, the patient's periodontal situation... In any case, It is important to understand that the initial inclination is important to generate space in the arch, without which the curve cannot be flattened.
At last, note that this protocol does not address the flattening of the posterior level curve, especially important in the case of the lower second molars, which should follow a similar sequence: Distalization (1mm), intrusion (1mm) and then close the space with the retroinclination of the anterior incisors.
Fountain: https://alignersacademy.es/