Background: Orthodontic treatment becomes an essential field in dentistry since it creates a healthy, functional "bite," which promotes oral health and general physical health. Aim: This study aimed to determine the defects in an old nickel-titanium orthodontic wire in the mouth after four weeks as compared to a new one, as well as their impact on orthodontic treatment quality, and to underline the necessity of restoring these defects using various methods. Methods: For this reason, this research extensively differentiates between two sets of samples of orthodontic arches, both new and used, and quantified their deterioration condition by examining their thermal responses in static and dynamic systems and joule heating. Results:The results showed that the used archwires bear more surface defects in terms of size and area when compared to unused ones. These affirmative conclusions were obtained with accurate results up to 99%. Conclusion:The importance of this study lies in the repetition of this technique for three famous companies in this field that increases the quantity of wire used (291 wires used and new), as no previous study has ever experimented with this large number of patients, if this indicates anything, it is the validity followed in this research, which is reflected in the reduction of errors.
Electron microscopic observation of the surface of orthodontic arches reveals observable differences between new and used arches after four weeks in the mouth. This qualitative observation led us to consider their study by stimulated infrared thermography. These dental arches consist of a nickel-titanium (NiTi) shape memory alloy and are highly stressed during the stay in the mouth. Over the months, there will be evolution of their mechanical properties with multifactorial causes. In this study, we will demonstrate that it is possible to differentiate between the used arcs from the new arcs by observing their thermal response during a controlled heating.
Objective: The aim was to observe the modification of NiTi arch wires mechanical characteristics before and after their use and to highlight that when shape memory and super elasticity are stressed, hardness and roughness are also altered. Materials and methods: Samples of used and new 0.016-0.022- and 0.016-inch archwires made by American Orthodontics (AO), AZDent and Ortho Classic (OC) were retrieved from 192 patients. They were analyzed using an Atomic Force Microscope, a hardness tester and SEM. The arches were classified into various categories: the qualitative factors that include manufacturers, type, usage, age, gender, size and location. The quantitative factors include roughness (nm) and hardness (Vickers). The analysis was divided into three parts, comparison of new arches for all three companies, comparison of used arches between all three and comparison between new and used arches company by company. Results: As expected, the acquired results revealed a decrease in the hardness value (ΔHV~50 Vickers) of the retrieved samples after 4–6-week oral installation compared to the control samples, as well as increased surface roughness and porosity. AZDent brand bows have the smallest drop in hardness. The AO brand arches proved to be the roughest while those manufactured by AZDent were the smoothest. It should also be noted that 0.016-0.022 arches showed the most degradation. Conclusion: We was able to demonstrate that the mechanical properties of NiTi arches (shape memory and super-elasticity) appear to differ significantly before and after intra-oral usage. That mean the old arch wires have fewer mechanical properties than the new one and, in this situation, we need to find a solution to avoid this problem.
Objective: The corrosion behavior of titanium alloy (NiTi) orthodontic wires shows a high resistance to corrosion in various solutions, such as Ringer's solution, artificial saliva, sodium chloride solution, and others. In these different liquids, NiTi corrosion resistance is higher than that of stainless steel or cobalt-based alloys. These research studies the behavior of the nickel-titanium Orthodontics archwires in the mouth by three methods. Methods: The first testing was the SEM that can perform EPMA (Electro Probing Micro Analysis), microanalysis X, and local and quantitative elementary analysis, and the examination of NiTi are observed in two ways: cross sectional and surface examination. The second one was the electrochemical analysis performed by immersion in an artificial saliva solution consisting of lactic acid at 0.1 moles per liter and sodium chloride at 0.1 mole per liter: Two types of NiTi orthodontic arches were tested. The first ones are from the manufacturer Ortho Classic and were used in the mouth for 4-6 weeks. The second arches are from the manufacturer AZ Dent and were new. The last test was the TEM cartography that shows the atoms and their dispersion on the surface of the wire. Results: The results showed that the presence of corrosion cells in the artificial saliva proved that the NiTi orthodontic archwires were able to initiate the process of corrosion in the mouth, particularly at the point of friction in contact with the braces (Ti6Al4V). Conclusion: The results obtained by the MET on thin sections of orthodontic arches prepared by the FIB method revealed the presence of double or multiple layers of titanium oxide and N-oxide plus aluminum.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.