Abstract
BackgroundThe aim of the present study was to evaluate the relationship between insertion torque and stability of miniscrews in terms of resistance against dislocation, then comparing a self-tapping screw with a self-drilling one.MethodsInsertion torque was measured during placement of 30 self-drilling and 31 self-tapping stainless steel miniscrews (Leone SpA, Sesto Fiorentino, Italy) in synthetic bone blocks. Then, an increasing pulling force was applied at an angle of 90° and 45°, and the displacement of the miniscrews was recorded.ResultsThe statistical analysis showed a statistically significant difference between the mean Maximum Insertion Torque (MIT) observed in the two groups and showed that force angulation and MIT have a statistically significant effect on miniscrews stability. For both the miniscrews, an angle of 90° between miniscrew and loading force is preferable in terms of stability.ConclusionsThe tested self-drilling orthodontic miniscrews showed higher MIT and greater resistance against dislocation than the self-tapping ones.
Highlights
The aim of the present study was to evaluate the relationship between insertion torque and stability of miniscrews in terms of resistance against dislocation, comparing a self-tapping screw with a self-drilling one
Orthodontic miniscrews are devices specially designed to be placed within the maxillofacial bones with the aim of providing anchorage for an orthodontic appliance [1]
Orthodontic miniscrews are designed for temporary usage, so in most cases osseointegration of the screw is unwanted in order to facilitate its removal, and only a primary stability is pursued [2]
Summary
The aim of the present study was to evaluate the relationship between insertion torque and stability of miniscrews in terms of resistance against dislocation, comparing a self-tapping screw with a self-drilling one. Orthodontic miniscrews ( known as microscrews, micro/mini-implants, orthodontic implants or TADs —temporary anchorage devices) are devices specially designed to be placed within the maxillofacial bones with the aim of providing anchorage for an orthodontic appliance [1]. They can have different diameters and lengths, body designs and thread shapes, and can be made of different alloys Orthodontic miniscrews are designed for temporary usage, so in most cases osseointegration of the screw is unwanted in order to facilitate its removal, and only a primary stability is pursued [2]. According to Melsen and Tepedino et al Head & Face Medicine (2017) 13:10
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