Bonded orthodontic retainers: The wire-composite interface

The bonded orthodontic retainer constructed from multistrand wire and composite is an efficient esthetic retainer, which can be maintained long-term. Clinical failures of bonded orthodontic retainers, most commonly at the wire/composite interface, have been reported. This in vitro investigation aime...

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Bibliographic Details
Published in:American journal of orthodontics and dentofacial orthopedics 1997, Vol.111 (1), p.67-74
Main Authors: Bearn, David R., McCabe, John F., Gordon, Peter H., Aird, John C.
Format: Article
Language:English
Subjects:
Adhesiveness
Analysis of Variance
Bisphenol A-Glycidyl Methacrylate
Composite Resins - chemistry
Dental Bonding
Dentistry
Humans
Materials Testing
Microscopy, Electron, Scanning
Orthodontic Appliance Design
Orthodontic Retainers
Orthodontic Wires
Resin Cements
Statistics, Nonparametric
Surface Properties
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Summary:The bonded orthodontic retainer constructed from multistrand wire and composite is an efficient esthetic retainer, which can be maintained long-term. Clinical failures of bonded orthodontic retainers, most commonly at the wire/composite interface, have been reported. This in vitro investigation aimed to evaluate selected multistrand wires and composite materials that are available for use in the construction of bonded fixed retainers. An in vitro model was developed to simulate the forces encountered at the wire/composite interface. No significant difference was detected between different multistrand wire types and diameters with regard to retention in composite. Wires were placed in one of three groups according to surface characteristics identified with scanning electron microscopy. Increasing the thickness of composite overlying the wire increased the force required to detach the wire from the composite. Thickness of composite greater than 1.0 mm overlying the wire may give little clinical advantage. Greater force was required to detach the wire from Concise Orthodontic (3M Unitek) than any other composite tested. In vitro abrasion resistance testing found Heliosit Orthodontic (Vivadent) and Right On (TP Orthodontics, Inc.) to have poor abrasion resistance, whereas Concise Orthodontic and Transbond (3M Unitek) had abrasion resistance comparable with restorative composites. Clinical recommendations are made based on these findings. (Am J Orthod Dentofac Orthop 1997;111:67-74.)
ISSN:0889-5406
1097-6752
DOI:10.1016/S0889-5406(97)70304-4