Over the past decade, the interest for miniscrews is continuously growing as confirmed by the amount of recent published studies. In particular, their use allows to make corrections in a single phase and avoids extractions of premolars, while keeping usual goals of treatment. Main results of pilot studies and some clinical examples are presented here to illustrate our therapeutic approach for the treatment of tooth discrepancy in Class I, Class II and Class III situations.

Three 10-mm-long miniscrews commonly employed in orthodontic treatment were compared in four different situations involving diverse thicknesses of cortical bone. The finite element method (FEM) was used in the study, in which a force of 250 g was applied in two directions: perpendicular and parallel to the bone surface. As the parameter under study was the thickness of cortical bone, simulations were performed in four different bone loss situations: 2.5, 2, 1.5 and 1 mm. Our aim was also to quantify the stresses and displacements generated when applying a force of 250 g perpendicular and parallel to the bone surface under the same skeletal conditions. The results reveal similar performance in the three analysed samples, with increased stresses and displacements in the surrounding bone in relation to similar variations in the thickness of cortical bone.