An investigation into the mechanical and aesthetic properties of new generation coated nickel-titanium wires in the as-received state and after clinical use.
- Bradley TG *Department of Developmental Sciences, Marquette University School of Dentistry, Milwaukee, WI, USA, thomas.bradley@marquette.edu.
- Berzins DW *Department of Developmental Sciences, Marquette University School of Dentistry, Milwaukee, WI, USA.
- Valeri N *Department of Developmental Sciences, Marquette University School of Dentistry, Milwaukee, WI, USA.
- Pruszynski J **Division of Biostatistics, Medical College of Wisconsin, Milwaukee, USA.
- Eliades T ***Department of Orthodontics and Paediatric Dentistry, Center of Dental Medicine, University of Zurich, Switzerland.
- Katsaros C ****Department of Orthodontics and Dentofacial Orthopedics, Medical School, University of Bern, Switzerland.
- 2013-07-23
Published in:
- European journal of orthodontics. - 2014
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
English
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.
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.
- Language
-
- English
- Open access status
- green
- Identifiers
-
- DOI 10.1093/ejo/cjt048
- PMID 23873791
- Persistent URL
- https://sonar.ch/global/documents/79702
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