The metal content of generic orthodontic brackets compared with proprietary brackets
Online veröffentlicht: 20. Juli 2021
Seitenbereich: 163 - 170
Eingereicht: 01. Jan. 2018
Akzeptiert: 01. Aug. 2018
DOI: https://doi.org/10.21307/aoj-2020-067
© 2018 Morgan Wishney et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Background
With minimal manufacturer information, a variety of ‘generic’ orthodontic brackets are available online from overseas distributors. The present study investigated the metal composition of generic orthodontic brackets compared with two well-known ‘proprietary’ brands.
Materials and methods
Ranging in price from AU$2.99 to $65, five sets of different generic brackets were obtained directly from China via eBay (G1, G2…G5). Proprietary brackets were obtained from American Orthodontics (P1) and Rocky Mountain Orthodontics (P2). The 11, 12, 13 and 14 brackets from each set were liquefied in an acid solution and subjected to trace element analysis using inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma optical emission spectroscopy (ICP-OES) with respect to nickel, chromium, iron, copper, molybdenum, manganese, cadmium, mercury, arsenic and lead. Statistical analysis investigated the compositional consistency within and between each brand.
Results
The composition of P1 and P2 agreed with the manufacturer’s data. The generic groups typically had low molybdenum and higher copper content and approximated either 17-4 or AISI304 stainless steels or a combination of both. No relationship between brand and consistency of manufacture could be identified. The cheapest bracket contained lead.
Conclusions
Generic and proprietary brackets showed differences in their metal composition that may have biocompatibility implications.