AI Article Synopsis
- The study investigates how different dimensions of orthodontic brackets and archwires affect torsional play, a factor that impacts clinical outcomes.
- Measurements revealed that bracket slots are typically larger than intended, while archwire sizes can vary, affecting the fit and resulting in torsional play that can hinder effective torque application.
- The findings emphasize the need for better manufacturer specifications on the edge bevel of archwires, as variability in production can lead to significant differences in clinical performance.
Article Abstract
Background: The loss of third-order information in pre-adjusted brackets due to torsional play is a problem in clinical orthodontics. The aim of this study was to evaluate the impact of slot height, archwire height, width and edge bevel's radius on the torsional play for three brackets/archwire systems.
Methods: Ninety brackets with a 0.022 × 0.028 in. slot with McLaughlin-Bennett-Trevisi prescription from three different manufacturers were selected, and the slot's height and depth were measured using a profile projector. Sixty stainless-steel rectangular archwires from three different manufacturers were sectioned and observed with a SEM to measure their height, width, and radius of edge bevel. The recorded data were used to calculate the theoretical torsional play between different slot-archwire combinations. One-way ANOVA was used to compare the measurements within different bracket types and among different manufacturers.
Results: Slot height was usually oversized. Archwire's height was usually undersized, but oversized wires were also observed. The radius edge bevel was the most variable parameter. A certain degree of torsional play is always present that differs from one bracket type to another of the same producer and that can even be doubled from one manufacturer to another.
Conclusions: Due to production tolerance, differences between the nominal values and the real dimensions of any components of a slot/archwire system are common. This results in a torsional play that limits torque expression. The archwire's edge bevel plays an important role in torque expression, and clearer information should be provided by the manufacturers regarding this aspect.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7487281 | PMC |
| http://dx.doi.org/10.1186/s40510-020-00333-5 | DOI Listing |
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