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Helical axis errors affect computer-generated occlusal contacts.

R DeLong1, C-C Ko, I Olson

  • 1Minnesota Dental Research Center for Biomaterials and Biomechanics, Department of Oral Science, University of Minnesota School of Dentistry, Moos Health Science Tower, 515 Delaware Street SE, Minneapolis, MN 55455, USA. delon002@tc.umn.edu

Journal of Dental Research
|July 5, 2002
PubMed
Summary
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Mandibular helical axis calculations are sensitive to position errors. However, even with small rotational errors (0.7-5.0 degrees), simulated mandibular motion accurately reflects occlusal contacts, ensuring reliable dental analysis.

Area of Science:

  • Biomechanical Engineering
  • Dental Mechanics
  • Craniofacial Kinesiology

Background:

  • Accurate calculation of the helical axis is crucial for describing mandibular motion.
  • Increasing proximity of mandibular positions used for calculation amplifies errors.
  • The impact of helical axis calculation errors on occlusal contact analysis is not fully understood.

Purpose of the Study:

  • To investigate the effect of helical axis calculation errors on simulated mandibular motion.
  • To quantify changes in occlusal contacts resulting from errors in helical axis parameters.
  • To determine the tolerance of occlusal contact analysis to helical axis calculation inaccuracies.

Main Methods:

  • A standard helical axis was computed from simulated lateral mandibular movement.

Related Experiment Videos

  • Digital interocclusal records were generated for mandibular rotations from 0 to 5 degrees around the standard axis.
  • Digital dental models were aligned to these records, and helical axis parameters and occlusal contacts were recalculated and compared.

    • Main Results:

    • Helical axes calculated from mandibular positions separated by 1.5 to 5.0 degrees produced equivalent occlusal contacts.
    • Occlusal contacts calculated using helical axes derived from rotations of 0.7 degrees or larger were nearly identical to the standard.
    • The study demonstrates a degree of robustness in occlusal contact analysis despite helical axis calculation errors.

    Conclusions:

    • Mandibular motion analysis using helical axes is tolerant to calculation errors within a specific range.
    • Occlusal contact analysis remains reliable even with moderate inaccuracies in helical axis determination.
    • These findings support the clinical applicability of helical axis analysis in dentistry, acknowledging potential sources of error.