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

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.

Nanotopography Evaluation of NiTi Alloy Exposed to Artificial Saliva and Different Mouthwashes

“…This, together with the fact that commercial mouthwashes with fluorine-containing compounds do not cause the dissolution of Ti-O but a release of Ni-ions [ 43 ] suggests that the investigated mouthwashes behave in the same fashion. The opposite trends on surface roughness which is observed for fluoride media are in agreement with the literature data that fluoride compound-containing media can induce both an increase [ 30 , 31 , 32 ] and a decrease [ 33 ] in surface roughness. Our findings suggest that these diverging trends are a consequence of preferred corrosion locations, relative to the mean plane.…”

“…These techniques allow detection of nanometric changes on the surface and quantification of these changes by surface roughness parameters. It is reported that both fluorine- and chlorine-containing compounds in media can cause a considerable change of the surface topography [ 10 , 26 , 30 , 31 , 32 , 33 ] and that the intensity of the corrosion processes can depend on the surface topography [ 18 , 23 , 31 , 34 ].…”

Clinical effect of chlorhexidine and sodium fluoride on corrosion behavior and surface topography of nitinol orthodontic archwires

“…Sample size was calculated according ( Arkin., 1984) and ( Belasic et al, 2021) using Eqs [ 7 , 8 ]. :…”

“…The sample size was calculated using a computer program SPSS software for windows version 22.0 (Statistical Package for Social Science, Armonk, NY: IBM Corp), G Power version 3.1.9 based on a previous study [ 8 ]. For the present study, the power sample size was more than 80%, the significance level was 0.05, the confidence interval was 95%, and the actual power was 95.40%.…”

Comparison of the High Cycle Fatigue Behavior of the Orthodontic NiTi Wires: An in Vitro Study

“…In fixed orthodontic treatment, changes in the mechanical characteristics of the archwires may cause negative effects on the mechanical properties or working properties and, consequently, disturb the clinical progress and outcome [6]. When the archwires are placed in the brackets, cyclical forces during mastication can produce fatigue and limit the wire's lifespan [7].…”