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Related Experiment Videos

Internal screw fixation: comparison of placement pattern and rigidity.

W L Foley1, D E Frost, W B Paulin

  • 1University of North Carolina, Chapel Hill.

Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons
|July 1, 1989
PubMed
Summary

The inverted L screw pattern offers superior rigidity for sagittal split ramus osteotomy fixation compared to linear patterns or K-wires. Screw type (compression vs. bicortical) did not impact rigidity when patterns were identical.

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Orthodontic Surgery
  • Biomechanical Engineering

Background:

  • Sagittal split ramus osteotomy (SSRO) is a common procedure in orthognathic surgery.
  • Various fixation methods exist for SSRO, but optimal biomechanical stability remains a focus.
  • Understanding screw placement's impact on osteotomy rigidity is crucial for clinical success.

Purpose of the Study:

  • To compare the transverse strength (rigidity) of simulated SSROs fixed with different screw configurations.
  • To determine if screw placement pattern significantly influences the biomechanical stability of the osteotomy.
  • To evaluate the effect of screw type (compression vs. bicortical) on rigidity within identical patterns.

Main Methods:

  • Six groups of simulated sagittal split ramus osteotomies were created.

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  • Different screw placement patterns (inverted L, linear) and fixation devices (screws, K-wires) were employed.
  • Transverse strength (rigidity) was measured for each fixation group.

    • Main Results:

    • Osteotomies fixed with an inverted L screw pattern demonstrated significantly greater rigidity (P < .05).
    • The inverted L pattern was superior to linear screw patterns and triangular K-wire patterns.
    • No significant difference in rigidity was found between compression and bicortical screws when using identical placement patterns.

    Conclusions:

    • The inverted L screw pattern provides enhanced biomechanical stability for sagittal split ramus osteotomies.
    • Screw placement pattern is a critical factor influencing osteotomy rigidity.
    • Clinical recommendations for SSRO fixation should consider the superior rigidity of the inverted L pattern.