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[Effect of bicortical orthodontic microimplant on tooth movement in dogs]
Jian-chao Wu1, Ji-na Huang, Shi-fang Zhao
1Department of Orthodontic, The Affiliated Stomatology Hospital, College of Medicine, Zhejiang University, Hangzhou 310031, China.
Objective:
To evaluate the potential anchorage of bicortical microimplant for tooth movement.
Methods:
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).
Result:
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.
Conclusion:
The bicortical microimplant may be used as orthodontic anchorage for mesial movement of posterior tooth.
