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Related Experiment Videos

A new intra-oral screw jack.

D R McMillan, G Tryde, K Stoltze

    Journal of Oral Rehabilitation
    |April 1, 1977
    PubMed
    Summary

    A novel screwjack design enhances vertical dimension assessment in edentulous patients using proprioception. This new device offers greater accuracy and a wider range of motion compared to existing methods.

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    Area of Science:

    • Dentistry
    • Biomedical Engineering
    • Prosthodontics

    Background:

    • Assessing vertical dimension of occlusion (VDO) is crucial in prosthodontics.
    • Existing methods may have limitations in range and accuracy.
    • Proprioceptive sensation offers a potential avenue for VDO determination.

    Purpose of the Study:

    • To describe a new screwjack design for VDO assessment.
    • To evaluate the accuracy and functional performance of the new screwjack.
    • To compare the new screwjack with existing devices.

    Main Methods:

    • A novel screwjack with a 9-21 mm range and captive elements was designed.
    • Laboratory experiments assessed reading errors and screw thread play.
    • Clinical experiments compared the new screwjack's performance against the Timmer version.

    Main Results:

    • The new screwjack demonstrated a mean thread play of 0.01 mm, significantly less than the Timmer version (0.05 mm).
    • Laboratory errors in interpretation did not exceed 0.1 mm, deemed clinically insignificant.
    • Clinical trials showed the new screwjack to be significantly more accurate than the Timmer version.

    Conclusions:

    • The new screwjack design is a clinically viable tool for VDO assessment in edentulous patients.
    • Its improved accuracy and range of motion offer advantages over existing devices.
    • The device's design prevents disassembly during use, enhancing reliability.

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