Effect of bicortical orthodontic microimplant on tooth movement in dogs / 浙江大学学报·医学版

ABSTRACT

<p><b>OBJECTIVE</b>To evaluate the potential anchorage of bicortical microimplant for tooth movement.</p><p><b>METHODS</b>Five bicortical microimplants were inserted in the interradicular area of the second premolar (P2) in one side of the mandible (test side), 5 monocortical microimplant in the contralateral region (control side) in 5 beagle dogs. A total of 100 g force was generated between the implant and the fourth premolar (P4) in two sides. M1-P4, CA-IB and CA-M1 were measured biweekly. At the end of loading, specimens with P4 segments were cut and grounded to 70 microm to calculate the bone-to-implant contact (BIC).</p><p><b>RESULT</b>All the bicortical microimplants remained stable during the treatment periods, while 1 monocortical microimplant was lost within 1 week. Mesial movement of P4 was ( 3.92+/-0.22) mm in the test side, (2.03+/-0.15) mm in the control side (P<0.05). Analysis showed no difference of the BIC between the bicortical microimplants and the monocortical microimplants.</p><p><b>CONCLUSION</b>The bicortical microimplant may be used as orthodontic anchorage for mesial movement of posterior tooth.</p>