Stability and time of miniscrew used as orthodontic anchorage in dogs / 吉林大学学报(医学版)

ABSTRACT

Objective To evaluate the effects of different loading occasions of orthodontic force on the stability of miniscrew as an anchorage.Methods The titanium miniscrews were respectively implanted into canine and posterior region of both upper and lower jaws of 3 crossbred dogs.The implants were immediately loaded with 200 g orthodontic force or loaded after 2 weeks of implantation.The dogs were sacrificed after 8 weeks.The samples including the microscrew implant and its around bone tissue were extracted,fixed and X-ray photographed.Then the specimens were decalcified,embedded,sectioned and stained with HE and GOMORI.The sections were examined under light microscope.Results The stability of miniscrew in posterior region of jaws was higher than that in canine region in X-ray photograph.There was more bone trabecular formation between miniscrew and jaw bone in non-immediately loaded group than those in immediately loaded group with HE and GOMORI.Conclusion The non-immediately loaded implant as an anchorage can afford more stability than the immediately loaded implant.