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Quintessence Int 41 (2010), No. 1     7. Dec. 2009
Quintessence Int 41 (2010), No. 1  (07.12.2009)

Page 59-66, PubMed:19907734


Quantitative assessment of orthodontic mini-implant displacement: The effect of initial force application
Holst, Alexandra Ioana / Karl, Matthias / Karolczak, Marek / Goellner, Matthias / Holst, Stefan
Objective: Primary stability and micromovement of orthodontic mini-implants depends on a number of factors and influences clinical success or failure. The purpose of this study was to assess the behavior of orthodontic mini-implants upon initial load application.
Method and Materials: Orthodontic mini-implants (n = 39) were inserted in the alveolar process of maxillary human cadaver specimens (n = 10). Increasing horizontal forces (up to 2.5 N) were applied, and triggered images were taken in 0.5-N load intervals. Additionally, peri-implant parameters based on micro-CT volume data were recorded. Data were subjected to a two-sided nonparametric Wilcoxon signed rank test, and betweengroup comparisons were assessed with a Mann-Whitney test (α = .05).
Results: Initial load application led to displacement beyond elastic recovery of the surrounding bone after force release (P < .001). Cortical thickness and insertion depth, despite numeric differences, did not reveal any statistical differences, while displacement of mini-implants was significantly affected by contact to neighboring teeth (P < .001).
Conclusions: Insertion technique and initial load application on orthodontic mini-implants may be regarded as two crucial factors for success, while repeated application of orthodontic force does not seem to increase screw mobility.

Keywords: cortical bone thickness, human cadaver, maxillary bone, mini-implant, optical measurement, primary stability