Properties of crimpable archwire hooks: a laboratory investigation

The aim of the present study was to utilize a strain gauge, which enabled the force applied to produce firmly attached crimpable hooks to rectangular stainless steel arch wires, to be measured. In vitro testing of two hooks, American Orthodontic (AO) and TP Orthodontic (TP), and two dimensions of st...

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Bibliographic Details
Published in:European journal of orthodontics Vol. 21; no. 6; p. 679
Main Authors: Johal, A, Harper, C R, Sherriff, M
Format: Journal Article
Language:English
Published: England 01.12.1999
Subjects:
Dental Stress Analysis - instrumentation
Dental Stress Analysis - methods
Dental Stress Analysis - statistics & numerical data
Female
Humans
Male
Orthodontic Appliance Design - statistics & numerical data
Orthodontic Brackets - statistics & numerical data
Orthodontic Wires - statistics & numerical data
Pilot Projects
Stainless Steel
ISSN:0141-5387
Online Access:Get more information
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Summary:The aim of the present study was to utilize a strain gauge, which enabled the force applied to produce firmly attached crimpable hooks to rectangular stainless steel arch wires, to be measured. In vitro testing of two hooks, American Orthodontic (AO) and TP Orthodontic (TP), and two dimensions of stainless steel archwire, 0.019 x 0.025 and 0.018 x 0.025-inch, was carried out using an Instron Universal Testing machine. The results demonstrate that there was a significant difference in the behaviour of the two types of crimpable hooks, with almost twice the force needed to dislodge the TP hooks compared with the AO hooks (11.7 and 6.22 N, respectively). When using TP hooks attached to either 0.019 x 0.025 or 0.018 x 0.025-inch stainless steel wires, the archwire size makes little difference to the force required to produce movement. The clinical significance of these findings is discussed.
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ISSN:0141-5387
DOI:10.1093/ejo/21.6.679