[Effect of bicortical orthodontic microimplant on tooth movement in dogs].
To evaluate the potential anchorage of bicortical microimplant for tooth movement.



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).



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.



The bicortical microimplant may be used as orthodontic anchorage for mesial movement of posterior tooth.
Wu
Jian-chao
JC
Department of Orthodontic, The Affiliated Stomatology Hospital, College of Medicine, Zhejiang University, Hangzhou 310031, China.
Huang
Ji-na
JN
Zhao
Shi-fang
SF
D000818:Animals; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D004285:Dogs; D008297:Male; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation*; D016382:Orthodontic Appliance Design; D009967:Orthodontic Appliances; D014087:Tooth Movement Techniques / Q000379:methods*
D015921:Dental Implants