Abstract
BackgroundTo compare the frictional resistance between passive self-ligating brackets and conventional brackets with low-friction ligature under bracket/archwire and root/bone interface during dental alignment and leveling.Material and MethodsA tridimensional model of the maxilla and teeth of a patient treated with conventional brackets, and slide ligatures was generated employing the SolidWorks modeling software. SmartClip self-ligating brackets and Logic Line conventional brackets were assembled with slide low-friction ligatures, utilizing archwires with different diameters and alloys used for the alignment and leveling stage. Friction caused during the bracket/archwire interface and stress during the bone/root interface were compared through a finite element model.ResultsSmartClip and Logic Line brackets with slide elastomeric low-friction elastomeric ligature showed similar frictional stress values of 0.50 MPa and 0.64 MPa, respectively. Passive self-ligating brackets transmitted a lower load along the periodontal ligament, compared to conventional brackets with a low-friction ligature.ConclusionsSlide low-friction elastomeric ligatures showed frictional forces during the bracket/archwire interface similar to those of the SmartClip brackets, while the distribution of stresses and deformations during the root/bone interface were lower in the passive self-ligating brackets. Key words:Orthodontic friction, finite element analysis, orthodontic brackets, orthodontic wires.
Highlights
Frictional resistance is the force that delays or impedes movement between two objects that are in contact [1]
The capacity of the archwire to slide through brackets and tubes is essential to achieve proper alignment and leveling since dental movement is only possible when the stress applied exceeds the friction caused during the bracket/archwire interface [2]
Material and Methods The following methodological sequence was conducted: the setting of mechanical characteristics of orthodontic materials, clinical treatment, construction of computer-assisted design (CAD) model of biological structures, and orthodontic accessories, assembly of systems, movement simulation, results, and comparison of the results. -Initial Clinical Treatment A patient with no systemic commitment was chosen; proper oral-dental conditions and slight dental crowding were mandatory; the orthodontic treatment was applied through the assembly of the following accessories: a Logic Line (Leone® Florence, Italy) MBT bracket system, slot 0.022” x 0.028” with Leone® SlideTM low-friction ligatures; a sequence of Ni-Ti 0.016”, 0.017”x0.025, 0.019”x0.225 archwires, β-Ti 0.017”x0.025”, and stainless steel 0.019”x0.025”
Summary
Frictional resistance is the force that delays or impedes movement between two objects that are in contact [1]. The objective of this study was to compare the behavior, in terms of frictional resistance, during the bracket/archwire and bone/root interface, between passive self-ligating brackets, and conventional brackets with Slide-type low-friction ligatures during the alignment, and leveling stage. To compare the frictional resistance between passive self-ligating brackets and conventional brackets with low-friction ligature under bracket/archwire and root/bone interface during dental alignment and leveling. SmartClip self-ligating brackets and Logic Line conventional brackets were assembled with slide low-friction ligatures, utilizing archwires with different diameters and alloys used for the alignment and leveling stage. Conclusions: Slide low-friction elastomeric ligatures showed frictional forces during the bracket/archwire interface similar to those of the SmartClip brackets, while the distribution of stresses and deformations during the root/bone interface were lower in the passive self-ligating brackets
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