The effect of bleaching agent on the compressive strength of orthodontic thermoplastic retainer materials

Abstract

Background: There is an increasing desire for teeth bleching after orthodontic treatment.
Therefor, this study aims to evaluate the effect of carbamide peroxide 15% and thermocycling
on the compressive strength of polyethylene terephthalate glycol (PETG) thermoplastic retainer
material.
Materials and Methods: In this in vitro study, forty samples of PETG material were thermoformed
over a plastic template (10 mm × 8 mm × 2 mm). The samples were divided into four groups, with
ten samples in each group. Group I served as the control, Group II was exposed to carbamide
peroxide 15% (5 h daily for 14 days), Group III underwent thermocycling (5000 times), and Group IV
underwent thermocycling (5000 times) followed by exposure to carbamide peroxide 15% (5 h daily
for 14 days). The compressive strength of the groups was then evaluated using one‑way ANOVA
and Tukey’s HSD tests for statistical analysis. The significance level was set to 0.05.
Results: The analysis showed a significant difference among the four groups. The compressive
strength of all groups significantly decreased compared to the control group. Group II exhibited a
significant decrease compared to Group III (P = 0.003). However, there was no significant difference
between Group II and Group IV (P = 0.191). In addition, there was no significant difference
observed between Group III and Group IV (P = 0.308). Group II had the lowest compressive
strength (163.9 Mpa).
Conclusion: It is not recommended to use a thermoplastic retainer as a bleaching tray during the
initial phase of retention. However, since there were no further harmful effects of bleaching agents
observed after thermocycling, it is possible to recommend the use of a thermoplastic retainer as
a bleaching tray toward the end of the retention phase.
Key Words: Bleaching agents, carbamide peroxide, orthodontic retainers, polyethylene terephthalates

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