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Factors associated with the success rate of orthodontic miniscrews placed in the upper and lower posterior buccal region.

Moon CH, Lee DG, Lee HS, Im JS, Baek SH

Department of Orthodontics, Gachon Medical School, Gil Medical Center, Incheon, South Korea. orthodm@gilhospital.com

OBJECTIVE: To determine the success rate and the factors related to the success rate of orthodontic miniscrew implants (OMI) placed at the attached gingiva of the posterior buccal region. MATERIALS AND METHODS: Four hundred eighty OMI placed in 209 orthodontic patients were examined retroactively. The sample was divided into young patients (range 10-18 years, N = 108) and adult patients (range 19-64 years, N = 109). The placement site was divided into three interdental areas from the first premolar to the second molar in the maxilla and mandible. According to soft tissue management, the samples were divided into incision and nonincision groups. Chi-square tests and multiple logistic regression analyses were used. RESULTS: The overall success rate was 83.8%. Dislodgement of the OMI occurred most frequently in the first 1-2 months, and more than 90% of the failures occurred within the first 4 months. Sex, age, jaw, soft tissue management, and placement side did not show any difference in the success rate. Placement site, however, showed a significant difference in the mandible of adult patients. There was no difference in the success rate in the maxilla. CONCLUSIONS: Placement site is one of the important factors for success rate of OMI.

Published 15 January 2008 in Angle Orthod, 78(1): 101-6.
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