Abstract
The purpose of this study was to compare the stability of porous TiNi alloy miniscrew implants with different force levels (0 g, 200 g, 400 g and 600 g) loaded immediately after placement. Using a randomized split-mouth design, we placed 16 miniscrews into 3 skeletally mature male beagle dogs. All the miniscrews were equally divided into 4 groups. The result showed that there was more fibrous tissue repair between the miniscrew-bone interfaces with the increase of the force levels. The 600 g load caused serious bone trabecular damage on the neck of miniscrew, whereas no significant effect on tissue around miniscrews has been apical. Not only was the miniscrew-bone interface completely mechanically integrated, but it also formed osteoid-like tissue. There was more fibrous healing, with the increasing of the force levels. Bone trabecular around the neck of the miniscrew destroyed, when the case of 600 g loaded.
