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Advances and Applications of Nickel-Titanium Alloys in Medical Fields (Volume II)

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Biomaterials".

Deadline for manuscript submissions: closed (20 November 2023) | Viewed by 3298

Special Issue Editor

Dr. Jorge Nuno do Martins

E-Mail Website
Guest Editor
School of Dental Medicine, University of Lisbon, 1600-277 Lisbon, Portugal
Interests: endodontics; tooth anatomy; NiTi instruments; NiTi alloys; cone-beam computed tomography; prevalence studies
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Since the observation of shape memory characteristics in an almost equiatomic nickel–titanium (NiTi) alloy in research developed for the United States of America Navy, the NiTi alloys have been employed in ocean engineering, but also in medical fields with applications in orthopedics, orthodontics, and endodontics. The almost equiatomic proportion of the main two elements led to a weight proportion of around 56% nickel and 44% titanium. As with other metallic alloys, NiTi can exist in several crystallographic arrangements. The changes in the alloy arrangement may result from stress application or temperature effects. Due to their characteristics, the NiTi alloys have been recurrently used in the manufacture of medical tools and instruments. This Special Issue intends to give an overview of the late advances, tendencies and applications of this alloy in multiple areas of medical fields. It’s my pleasure to invite you to contribute with this Special Issue, where both research papers and reviews, with focus on the following potential topics, are welcome. Potential topic include, but are not limited to: novel medical applications; advances in technical procedures; new technologies and recent developments on manufacturing; mechanical properties and novel modes to assess it; new concepts, historical and future perspectives

Dr. Jorge Nuno do Martins
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • mechanical properties
  • metal alloys
  • metallurgy
  • nickel/titanium alloys
  • phase transformation
  • strength
  • structural characterization

Published Papers (2 papers)

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Research

15 pages, 2293 KiB  
Article
Thermal Behavior Changes of As-Received and Retrieved Bio-Active® (BA) and TriTanium® (TR) Multiforce Nickel–Titanium Orthodontic Archwires
by Angelina Stoyanova-Ivanova, Mirela Georgieva, Valeri Petrov, Jorge N. R. Martins, Laura Andreeva, Alexander Petkov, Nadia Petrova and Velizar Georgiev
Materials 2023, 16(10), 3776; https://doi.org/10.3390/ma16103776 - 17 May 2023
Cited by 1 | Viewed by 1240
Abstract
Multiforce nickel–titanium (NiTi) orthodontic archwires release progressively increasing forces in a front-to-back direction along their length. The properties of NiTi orthodontic archwires depend on the correlation and characteristics of their microstructural phases (austenite, martensite and the intermediate R-phase). From a clinical and manufacturing [...] Read more.
Multiforce nickel–titanium (NiTi) orthodontic archwires release progressively increasing forces in a front-to-back direction along their length. The properties of NiTi orthodontic archwires depend on the correlation and characteristics of their microstructural phases (austenite, martensite and the intermediate R-phase). From a clinical and manufacturing point of view, the determination of the austenite finish (Af) temperature is of the greatest importance, as in the austenitic phase, the alloy is most stable and exhibits the final workable form. The main purpose of using multiforce orthodontic archwires is to decrease the intensity of the applied forces to the teeth with a small root surface area, such as the lower central incisors, and also provide forces high enough to move the molars. With the optimally dosed forces of multiforce orthodontic archwires in the frontal, premolar and molar segments, the feeling of pain can be reduced. This will contribute to the greater cooperation of the patient, which is of utmost importance to achieve optimal results. The aim of this research was to determine the Af temperature at each segment of as-received and retrieved Bio-Active® and TriTanium® archwires with dimensions of 0.016 × 0.022 inches, investigated by the differential scanning calorimetry (DSC) method. A classical Kruskal–Wallis one-way ANOVA test and multi-variance comparison based on the ANOVA test statistic using the Bonferroni corrected Mann–Whitney test for multiple comparisons were used. The incisor, premolar and molar segments have different Af temperatures, and they decrease from the anterior to posterior so that the posterior segment has the lowest Af. Bio-Active® and TriTanium® with dimensions of 0.016 × 0.022 inches can be used as first leveling archwires by additional cooling and are not recommended for use on patients with mouth breathing. Full article
(This article belongs to the Special Issue Advances and Applications of Nickel-Titanium Alloys in Medical Fields (Volume II))
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16 pages, 5677 KiB  
Article
3D Surface Scanning—A Novel Protocol to Characterize Virtual Nickel–Titanium Endodontic Instruments
by Jorge N. R. Martins, Ricardo Pinto, Emmanuel J. N. L. Silva, Marco Simões-Carvalho, Duarte Marques, Rui F. Martins and Marco A. Versiani
Materials 2023, 16(10), 3636; https://doi.org/10.3390/ma16103636 - 10 May 2023
Cited by 4 | Viewed by 1785
Abstract
The nickel–titanium (NiTi) instruments’ geometry plays an important role in their performance and behavior. The present assessment intends to validate and test the applicability of a 3D surface scanning method using a high-resolution laboratory-based optical scanner to create reliable virtual models of NiTi [...] Read more.
The nickel–titanium (NiTi) instruments’ geometry plays an important role in their performance and behavior. The present assessment intends to validate and test the applicability of a 3D surface scanning method using a high-resolution laboratory-based optical scanner to create reliable virtual models of NiTi instruments. Sixteen instruments were scanned using a 12-megapixel optical 3D scanner, and methodological validation was performed by comparing quantitative and qualitative measurements of specific dimensions and identifying some geometric features of the 3D models with images obtained through scanning electron microscopy. Additionally, the reproducibility of the method was assessed by calculating 2D and 3D parameters of three different instruments twice. The quality of the 3D models created by two different optical scanners and a micro-CT device was compared. The 3D surface scanning method using the high-resolution laboratory-based optical scanner allowed for the creation of reliable and precise virtual models of different NiTi instruments with discrepancies varying from 0.0002 to 0.0182 mm. The reproducibility of measurements performed with this method was high, and the acquired virtual models were adequate for use in in silico experiments, as well as for commercial or educational purposes. The quality of the 3D model obtained using the high-resolution optical scanner was superior to that acquired by micro-CT technology. The ability to superimpose virtual models of scanned instruments and apply them in Finite Element Analysis and educational purposes was also demonstrated. Full article
(This article belongs to the Special Issue Advances and Applications of Nickel-Titanium Alloys in Medical Fields (Volume II))
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