Factors Associated with the Success Rate of Orthodontic Miniscrews Placed in the Upper and Lower Posterior Buccal Region

Abstract

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 ϭ 108) and adult patients (range 19-64 years, N ϭ 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.

Uprighting of the Impacted Second Mandibular Molar with Skeletal Anchorage

“…The use of miniscrews and their success rate are predictable. (Degichi et al, 2003), (Motoyoshy et al, 2007), (Yanosky & Holmes, 2008), (Moon et al, 2008), (Manni et al, 2010).…”

Temporary Anchorage Device Stability: Monocortical Versus Bicortical Anchorage Technique

“…[12][13] Primary stability of the orthodontic miniscrew occurs when mechanical stability is achieved in the bone immediately after the miniscrew is inserted into the bone. [14][15][16][17][18] The primary stability of temporary skeletal anchorage can be influenced by many factors including geometry of miniscrew, bone characteristics, angulation placement of miniscrew and pullout force which is the major factor for clinical success with miniscrews. [19][20] These factors may directly or indirectly affect the results.…”

Avaliação da resistência à flexão e fratura de mini-implantes ortodônticos

“…Com a utilização dos mini-implantes, surge um novo conceito de ancoragem em Ortodontia, denominado ancoragem esquelética, a qual não permite a movimentação da unidade de reação 1 . Ela é obtida devido à incapacidade de movimentação da unidade de ancoragem frente à mecânica ortodôntica 4,12,14,20 . Assim como nos sistemas convencionais de implantes dentários, os profissionais que instalam os mini-implantes devem tomar cuidados especiais, tanto na cirurgia como na fase de aplicação da força ortodôntica, uma vez que pode ocorrer deformação ou, até mesmo, a fratura do mini-implante 3,8 .…”