Abstract
The orthodontic miniscrew (TADs) is a device that is fixed into bone in the short term for the purpose of enhancing orthodontic anchorage. The aim of our study was to investigate the structural and surface properties of recovered TADs after orthodontic treatment, and compare them to new TADs. TADs (n = 15) from the same manufacturer (Absoanchor; Dentos, Daegu, Korea) were assessed; n = 10 were recovered from patients after orthodontic treatment and n = 5 were new. We performed electrochemical investigations, scanning electron microscopy (SEM) and microbiological analysis. Qualitative analysis on general electrochemical polarization revealed that the TADs retrieved from the patients provided much lower current densities in the passivity zone, and the oxidative processes taking place on their surface were of lower intensity. The surface morphologies of the tips of the retrieved mini-implants showed less sharp tips and smooth surfaces. Defects in the form of pores or cracks could be identified in both evaluated TAD groups. All retrieved TADs showed signs of biological materials (SEM analysis) and contamination on their surfaces. In conclusion, these results can assist orthodontists in comprehending the complexities of TAD behavior with respect to their design and structure.
Highlights
Orthodontic miniscrews were first made known by Gainsforth and Higley in an animal study
A Vitallium screw was placed in the anterior edge of the mandible branch of five dogs, to apply traction using orthodontic elastic connected to a maxillary device for skeletal anchorage [1]
A temporary anchorage device (TADs) is a device that is, in the short term, fixed to the bone orthodontic anchorage supporting the teeth of the reactive unit, or avoiding the need for the reactive unit, and which is removed after use [3,4]
Summary
Orthodontic miniscrews were first made known by Gainsforth and Higley in an animal study.
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