Photoelastic analysis of stress generated by wires when conventional and self-ligating brackets are used: A pilot study

Photoelastic analysis of stress generated by wires when conventional and self-ligating brackets are used: A pilot study

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OBJECTIVE: By means of a photoelastic model, this study analyzed the stress caused on conventional and self-ligating brackets with expanded arch wires.METHOD: Standard brackets were adhered to artificial teeth and a photoelastic model was prepared using the Interlandi 19/12 diagram as base.Successive activations were made with 0.014-in and 0.

018-in rounded cross section Nickel-Titanium wires (NiTi) and 0.019 x 0.025-in rectangular stainless steel wires Recovery - Training Equipment all of which made on 22/14 Interlandi diagram.The model was observed on a plane polariscope - in a dark field microscope configuration - and photographed at each exchange of wire.

Then, they were replaced by self-ligating brackets and the process was repeated.Analysis was qualitative and observed stress location and pattern on both models analyzed.CONCLUSIONS: Results identified greater stress on the region of the apex of premolars in both analyzed models.Upon comparing the stress between models, a greater amount of stress Antennas was found in the model with conventional brackets in all of its wires.

Therefore, the present pilot study revealed that alignment of wires in self-ligating brackets produced lower stress in periodontal tissues in expansive mechanics.