Influence of intraoral application of antiseptics and fluorides during orthodontic treatment on corrosion and mechanical characteristics of nickel-titanium alloy in orthodontic appliances

Tihana Zibar Belasic, Biljana Pejova, Helena Otmacic Curkovic, Ervin Kamenar, Bojana Cetenovic, Stjepan Spalj, Tihana Zibar Belasic, Biljana Pejova, Helena Otmacic Curkovic, Ervin Kamenar, Bojana Cetenovic, Stjepan Spalj

Abstract

Objectives: To explore whether the commercial agents recommended for controlling dental biofilm formation had a significant effect in vivo on mechanical and corrosion properties of nickel-titanium (NiTi) alloy.

Materials and methods: NiTi archwires (dimensions 0.508 × 0.508 mm) were collected from 36 orthodontic patients aged 13-42 years after a 3-month intraoral exposure. Three experimental groups were formed: (1) subjects conducting regular oral hygiene, (2) subjects who used fluorides for intensive prophylaxis for the first month, and (3) subjects who used chlorhexidine in the same manner. Corrosion behavior, surface characteristics, stiffness, hardness, and friction were analyzed.

Results: Exposure to intraoral conditions significantly reduced the stiffness and hardness of the NiTi alloy (P ≤ .015). Fluoride tended to reduce stiffness and hardness more than did saliva or antiseptic, but not significantly. Roughness and friction were not significantly influenced by oral exposure. Intraoral aging predominantly produced general corrosion independent of the adjuvant prophylactic agent, although localized corrosion may also have occurred.

Conclusions: Fluorides and the antiseptic chlorhexidine do not increase corrosion more than saliva itself, nor do they further modify the mechanical properties of the NiTi alloy.

Trial registration: ClinicalTrials.gov NCT03334461.

Keywords: Antiseptics; Corrosion; Fluorides; Nickel; Titanium.

© 2021 by The EH Angle Education and Research Foundation, Inc.

Figures

Figure 1.
Figure 1.
Two- and three-dimensional AFM microphotographs of the studied unexposed and exposed NiTi wire samples.
Figure 2.
Figure 2.
FTIR spectra of samples.
Figure 3.
Figure 3.
Comparison of stiffness, hardness, and friction among experimental conditions.
Figure 4.
Figure 4.
Comparison of NiTi archwires that exhibited pitting corrosion (upper figure), those that did not exhibit pitting corrosion (middle), and comparison with the as-received samples (lower figure).
Figure 5.
Figure 5.
Bode plots for dependence of phase angle on the frequency.

Source: PubMed

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