Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Force relaxation in orthodontic arch wires.

R J Hazel, G J Rohan, V C West

    American Journal of Orthodontics
    |November 1, 1984
    PubMed
    Summary

    Selecting orthodontic arch wires based on measured force relaxation offers superior results compared to clinical impressions. Nitinol wires showed no relaxation at body temperature, indicating potential for consistent force delivery in orthodontic appliances.

    Related Concept Videos

    You might also read

    Related Articles

    Articles linked to this work by shared authors, journal, and citation graph.

    Sort by
    Same author

    The effect of the Myo device on the gingival health in orthodontic patients.

    Australian dental journal·1995
    Same author

    Mechanical properties of some polymer materials used for tooth positioners.

    Australian dental journal·1994
    Same author

    Deformation of orthodontic archwires over time.

    Australian orthodontic journal·1994
    Same author

    The dynamic frictional resistance between orthodontic brackets and arch wires.

    American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics·1994
    Same author

    Terminology of facial morphology in the vertical dimension.

    Australian dental journal·1993
    Same author

    Terminology of facial morphology in the vertical dimension.

    Australian dental journal·1993

    Area of Science:

    • Orthodontic Materials Science
    • Biomedical Engineering
    • Dental Mechanics

    Background:

    • Current orthodontic arch wire selection relies on subjective clinical judgment, which is suboptimal.
    • Understanding force relaxation is crucial for predicting appliance behavior and treatment outcomes.
    • Objective measurement of wire properties can lead to more predictable orthodontic treatment.

    Purpose of the Study:

    • To develop and utilize an apparatus for measuring force relaxation in orthodontic arch wires.
    • To compare the force relaxation characteristics of different orthodontic wire materials (stainless steel, Elgiloy, nitinol).
    • To evaluate the effect of temperature on force relaxation, particularly at body temperature (37°C).

    Main Methods:

    • An apparatus was designed to measure force relaxation in representative arch-form orthodontic wires.
    • Force relaxation measurements were conducted on stainless steel, Elgiloy, and nitinol wires.
    • Experiments were performed at two temperatures: 21°C (room temperature) and 37°C (body temperature).

    Main Results:

    • All tested wires exhibited force relaxation at 21°C.
    • Nitinol wires demonstrated no significant force relaxation at 37°C.
    • Stainless steel wires (Wilcock) showed less relaxation than Elgiloy wires at both temperatures.
    • A specific heat treatment eliminated relaxation in green Elgiloy and reduced it in blue Elgiloy.

    Conclusions:

    • Objective force relaxation measurements provide a better basis for orthodontic wire selection than clinical impressions.
    • Nitinol's lack of relaxation at body temperature suggests its suitability for applications requiring sustained, predictable forces.
    • Material properties and heat treatments significantly influence the force relaxation behavior of orthodontic wires.

    Related Experiment Videos