Morphological and Structural Characterization of Two Types of As-Received and In vivo Orthodontic Stainless Steel Brackets.
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Date
2012-10
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Abstract
Aims: To perform a) a topographical analysis of the bracket slot of 12 as-received
stainless steel brackets and of in vivo used stainless steel brackets from 7 patients and
b) a compositional characterization of the constituting materials of two types of brackets.
Study Design: In vitro laboratory study.
Methodology: 12 as-received brackets and in vivo used brackets of seven patients were
analysed. Two commercially available brackets were used for this study. A SEM analysis
evaluated the topographic features of each bracket slot while an EDAX analysis was
performed to analyse the constituting parts of each bracket.
Results: As-received ORMCO brackets show more traces of plastic deformation than
GAC brackets. On the contrary, pits, crevices and grain boundaries were observed on all
as-received brackets. An increased plastic deformation and amount of scratches was
noticed on ORMCO and GAC brackets after orthodontic treatment. Elemental analysis
revealed that base and wing materials were not identical in GAC nor in Ormco brackets.
In addition, both ORMCO and GAC brackets consist each of two parts assembled using
a different brazing material.
Conclusion: Both as-received brackets show different damage patterns on their slot surface. Increase of damage patterns was visualized after intra-oral use. As a
consequence of the use of different constituting materials for the manufacturing of the
two types of brackets investigated, galvanic corrosion is likely to occur.
Description
Keywords
Brackets, morphological evaluation, surface characteristics, as received, in vivo
Citation
Hoste Sofie, Celis Jean-Pierre, Willems Guy. Morphological and Structural Characterization of Two Types of As-Received and In vivo Orthodontic Stainless Steel Brackets. British Journal of Medicine and Medical Research. 2012 Oct-Dec; 2(4): 662-675.