Quantitative assessment of orthodontic mini-implant displacement: the effect of initial force application

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. Orthodontic mini-implants (n = 39) were inserte...

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Published inQuintessence international (Berlin, Germany : 1985) Vol. 41; no. 1; p. 59
Main Authors Holst, Alexandra Ioana, Karl, Matthias, Karolczak, Marek, Goellner, Matthias, Holst, Stefan
Format Journal Article
LanguageEnglish
Published Germany 01.01.2010
Subjects
Bone Density
Bone Screws
Cadaver
Dental Implantation, Endosseous - methods
Dental Implants
Dental Stress Analysis
Elasticity
Equipment Failure
Humans
Maxilla - diagnostic imaging
Maxilla - surgery
Miniaturization
Orthodontic Anchorage Procedures - instrumentation
Orthodontic Appliance Design
Photogrammetry
Statistics, Nonparametric
Stress, Mechanical
Tooth Movement Techniques
Torque
X-Ray Microtomography
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Summary: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. 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 between-group comparisons were assessed with a Mann-Whitney test (alpha = .05). 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). 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.
ISSN:1936-7163