The Efficacy of Tow Mechanics for Total-maxillary-arch-distalization

A group of patients in which participants will be undergo to the one-jaw mechanic for mini-implants anchored total-maxillary-arch-distalization (the mini-implants will be inserted in the maxillary arch between the roots of 2nd premolar and 1st molar and closer to the molar, then a force of 250 g will be applied from the TAD to a hook lateral to the laterals).

A group of patients in which participants will be undergo to the tow-jaw mechanic for mini-implants anchored total-maxillary-arch-distalization (the mini-implants will be inserted in the mandibular arch between the 2nd premolar and 1st molar, then, a class II elastics 3/16 and 6.5oz will be use from the TAD to the hook of canines brackets).

A group of patients in which participants will be undergo to the en-mass retraction with first premolars extraction with mini-implants in the maxillary arch inserted between the 2nd premolar and 1st molar, then a force of 250 g will be applied from the TAD to a hook lateral to the laterals .