Faculty Collaboration Database

An investigation into the mechanical and aesthetic properties of new generation coated nickel-titanium wires in the as-received state and after clinical use. Eur J Orthod 2014 Jun;36(3):290-6

Date

07/23/2013

Pubmed ID

23873791

DOI

10.1093/ejo/cjt048

Scopus ID

2-s2.0-84901461145 (requires institutional sign-in at Scopus site)   29 Citations

Abstract

BACKGROUND/OBJECTIVES: The purpose of this study was to compare the mechanical, structural, and aesthetic properties of two types of aesthetic coated nickel-titanium (NiTi) wires compared with comparable regular NiTi wires in the as-received state and after clinical use.

MATERIALS/METHODS: Sixty one subjects were randomly assigned to four groups (N = 61), two groups of coated wires and two groups of comparable, non-coated controls (n = 15/group). The period in the mouth ranged from 4 to 12 weeks after insertion. In total, 121 wires (61 retrieved and 60 as-received) were used in the study. The percentages of coating retention and loss were extrapolated from scans. A brief survey of five questions with three choices was given to all patients. Differential scanning calorimetry (DSC) and three-point bending tests were done on as-received and used wires.

RESULTS: The surface characterization by the percentage of resin remaining indicated that most wires in both test groups lost a significant amount of coating. A patient survey indicated that this was a noticeable feature for patients. DSC analysis of the wires indicated that the metallurgical properties of the coated wires were not similar to the uncoated wires in the as-received condition. Three-point bending results indicate a wide variation in test results with large standard deviations among all the groups.

LIMITATIONS: The extent of coating loss requires investigating, as do the biological properties of the detached coating.

CONCLUSIONS: Both wires lost a significant amount of aesthetic coating after varying periods in the mouth. The metallurgical testing of these findings may indicate that these wires perform differently in the mouth.

Author List

Bradley TG, Berzins DW, Valeri N, Pruszynski J, Eliades T, Katsaros C

Author

David Berzins BS,PhD Graduate Program Director for Dental Biomaterials in the General Dental Sciences/Dental Biomaterials department at Marquette University

MESH terms used to index this publication - Major topics in bold

Adolescent
Calorimetry, Differential Scanning
Child
Coated Materials, Biocompatible
Dental Alloys
Elasticity
Equipment Failure
Esthetics, Dental
Female
Humans
Male
Materials Testing
Nickel
Orthodontic Appliance Design
Orthodontic Wires
Pliability
Titanium
Young Adult