Abstract
The use of miniscrews for anchorage control during orthodontic movements has the potential to improve the treatment of different type of malocclusions.
There are several factors to evaluate the stability such as bone quality, gender, oral hygiene, facial typology, insertion sites and anchorage types, that mainly determines the survival rate.
Materials and methods: one hundred and four self-drilling, self-tapping, and Ti6AI4V alloy miniscrews implants (1,8×10 mm) were inserted in edentulous sites (59 in the mandible, 45 in the maxilla) during 12 months, for sixty-four patients (32 females, 32 males; age range 12-19 years) as orthodontic anchorages to support tooth movements. Orthodontic loads were applied immediately after miniscrew placement.
Results: an overall cumulative survival rate of 91% was found in our study. The cumulative failure rate was found to be significantly higher when miniscrews were placed in the maxilla (16%), especially with poor oral hygiene (33%), next to thin cortical sites (22%) using monocrotical anchorage (24%).
Conclusion: the present results confirm that factors mentioned above impair miniscrews implants secondary stability.
Keywords: Anchorage, Miniscrews implant, stability, secondary, failures rate.
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