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Related Concept Videos

Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

246
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
246
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

233
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
233

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Related Experiment Video

Updated: Sep 14, 2025

C-arm-Free Simultaneous OLIF51 and Percutaneous Pedicle Screw Fixation in a Single Lateral Position
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Using a Single-Screw Cortical Disc for a Simplified Shell Technique: A Novel Approach and Technical Note.

Mehdi Ekhlasmandkermani1,2, Fatemeh Goudarzimoghaddam3, Mohammad Sabet Jahromi2

  • 1Dentistry, School of Dentistry, Kerman University of Medical Sciences, Kerman, IRN.

Cureus
|July 22, 2025
PubMed
Summary

This study introduces a modified shell technique for horizontal bone augmentation in implant dentistry. The simplified approach, using a single-screw cortical disc, effectively increases bone width and enhances surgical management.

Keywords:
allograftalveolar ridge augmentationbone graftcortical bone platedental implantsshell technique

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Area of Science:

  • Implant Dentistry
  • Oral Surgery
  • Regenerative Medicine

Background:

  • Horizontal bone deficiency presents a significant challenge in implant dentistry.
  • Guided bone regeneration is standard, but new techniques like the shell technique offer improved bone gain.
  • A modified shell technique provides a simplified, minimally invasive solution for horizontal bone defects.

Purpose of the Study:

  • To introduce a modified, practitioner-friendly shell technique for horizontal bone augmentation.
  • To simplify space maintenance and surgical management in bone reconstruction.
  • To enable extraoral screw fixation for enhanced stability and patient comfort.

Main Methods:

  • Six patients with horizontal bone defects underwent augmentation using a modified shell technique.
  • Cortical discs were fabricated and secured with a single extraoral screw, anchored bi-cortically.
  • The gap was filled with a combination of autogenous chips and allograft material.

Main Results:

  • Postoperative cone-beam computed tomography (CBCT) at five months showed bone width increases ranging from 2.03 mm to 5.76 mm.
  • Initial bone width ranged from 1.74 mm to 4.40 mm before reconstruction.
  • Radiographs confirmed significant bone formation after the procedure.

Conclusions:

  • The modified shell technique, utilizing a single extraoral screw fixation, simplifies the surgical process.
  • This approach effectively addresses horizontal bone deficiencies, enhancing bone augmentation.
  • The technique offers improved patient comfort and surgical manageability.