[One phase or two-phase orthodontic treatment: comparisons]

The optimal timing for starting an orthodontic treatment is discussed by many authors. This is even more difficult that there are different therapeutic approaches. In case of Class II, division 1 malocclusion, one approach consists of realising an early treatment during mixed dentition, then a surveillance phase and finally an alignment phase during adolescent dentition. The other approach consists of waiting for adolescent dentition to treat.

We made a study with 65 subjects with Class II, division 1 malocclusion: 33 were treated in one phase during adolescent dentition and 32 were treated in two phases, beginning in mixed dentition. In both groups the patients had the same age at the beginning of treatment and were treated with Distal Active Concept.

Correction of offset bases bone, increase of the diagonal mandibular and over-jet stability are significantly better in the group treated in two phases. We guess that the functions estimated progressively more and more surely in this new environment.