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Related Experiment Video

Updated: May 13, 2025

Designing CAD/CAM Surgical Guides for Maxillary Reconstruction Using an In-house Approach
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Validating a Novel 3D Printed Depth Gauge With Mandible Models.

Eric M Smith1, Rhorie P Kerr1, Ashley E Kita1

  • 1Department of Head and Neck Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA.

Surgical Innovation
|April 13, 2025
PubMed
Summary

A novel 3D-printed bone depth gauge improves accuracy for first-time users in head and neck surgery. This innovative tool performs comparably to standard gauges, reducing risks associated with inaccurate screw sizing.

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Area of Science:

  • Biomedical Engineering
  • Surgical Instrumentation
  • Orthopedic Surgery

Background:

  • Traditional bone depth gauges used in head and neck surgery exhibit significant inaccuracies.
  • Inaccurate screw sizing can lead to complications such as soft tissue irritation, repair weakness, and refracture.

Purpose of the Study:

  • To develop and evaluate a novel 3D-printed depth gauge prototype for improved screw length selection in fracture fixation.
  • To compare the accuracy of the prototype depth gauge against an industry-standard device.

Main Methods:

  • A 3D-printed depth gauge with a deployable hook and disassembly feature was designed.
  • Measurements were taken from drilled holes in a synthetic mandible by medical students, residents, and fellows/attendings using both gauges.
Keywords:
facial plasticshardwareopen reduction and internal fixationorthopedicsplatingprototypingreconstructive surgerysurgical techniquessurgical training

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  • Device accuracy was assessed by comparing measurements to true hole depths, with statistical analysis of differences between devices and user experience levels.
  • Cadaveric testing was also performed.

    • Main Results:

    • In the synthetic model, the prototype depth gauge demonstrated greater overall accuracy, particularly among novice users (medical students).
    • No significant difference in accuracy was found between the prototype and the industry standard gauge when comparing true depths to measured depths.
    • Prototype malfunctions occurred during cadaveric testing, though overall accuracy remained comparable.

    Conclusions:

    • The novel 3D-printed depth gauge shows potential for enhancing accuracy, especially for inexperienced users in surgical settings.
    • The device performs non-inferiorly to current industry standards, offering a promising alternative for improving screw length selection accuracy.