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The resistance to axial dislodgement of nickel titanium compression arch wire hooks - an in vitro study
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2019 (English)In: Australasian Orthodontic Journal, ISSN 2207-7480, Vol. 35, no 1, p. 21-26Article in journal (Refereed) Published
Abstract [en]

Objective: To evaluate the level of force required to axially dislodge nickel titanium compression hooks (Trillium Compression HookTM, Hespeler Orthodontics) placed on orthodontic arch wires in vitro. Materials and methods: Nickel titanium compression hooks were placed on arch wires with a specially designed pair of pliers. The resistance to axial dislodgement was tested on a total of 260 hooks placed in a standardised way on round (0.016", 0.018", 0.020"), square (0.020 × 0.020") and rectangular (0.016 × 0.022", 0.019 × 0.025", 0.021 × 0.025") stainless steel (Rocky Mountain Orthodontics), nickel titanium, or β-titanium (Hespeler Orthodontics) arch wires. The forces required to displace the hooks were recorded using an Instron tensile testing machine. The data were compared with the results reported in similar studies on stainless steel crimpable arch wire hooks. Results: The forces required to dislodge the compression hooks varied between 45.0 N and 161.9 N. The hook’s resistance to dislodgement was found to be high in all tested hook/wire combinations. The lowest recorded average dislodging force was found in the 0.020" nickel titanium group and the highest average force was in the 0.016 × 0.022" β-titanium group. Conclusion: The forces needed to dislodge the tested nickel titanium compression arch wire hooks exceed the force levels previously reported for stainless steel crimpable arch wire hooks.

Place, publisher, year, edition, pages
Australian Society of Orthodontists , 2019. Vol. 35, no 1, p. 21-26
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-268564Scopus ID: 2-s2.0-85073728255OAI: oai:DiVA.org:kth-268564DiVA, id: diva2:1423276
Note

QC 20200414

Available from: 2020-04-14 Created: 2020-04-14 Last updated: 2020-04-14Bibliographically approved

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Öberg, Martin

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