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Related Concept Videos

Frictional Forces on Screws01:17

Frictional Forces on Screws

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Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
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Self-Locking Screw01:16

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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
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Residual Stresses in Circular Shafts01:10

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In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
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Related Experiment Video

Updated: May 31, 2025

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Pre- and Post-Procedural Considerations and Thread Types for Thread Lifting.

Gi-Woong Hong1, Jovian Wan2, Song-Eun Yoon3

  • 1Samskin Plastic Surgery Clinic, Seoul 06577, Republic of Korea.

Life (Basel, Switzerland)
|January 25, 2025
PubMed
Summary
This summary is machine-generated.

Facial thread lifting offers a minimally invasive option, comparing U-shaped and I-shaped threads for rejuvenation. U-shaped threads provide significant lifting but have higher complication risks, while I-shaped threads are safer but offer less dramatic results.

Keywords:
facial musclesminimally invasiverejuvenationrhytidoplastysuperficial musculoaponeurotic systemsurgical procedures

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Area of Science:

  • Aesthetic Medicine
  • Plastic Surgery
  • Dermatology

Background:

  • Facial thread lifting is a minimally invasive alternative to traditional facelifts.
  • U-shaped and I-shaped barbed threads are prominent types used for facial rejuvenation.
  • Understanding their mechanical principles and clinical outcomes is crucial for effective application.

Purpose of the Study:

  • To analyze anatomical considerations, procedural techniques, and clinical outcomes of U-shaped and I-shaped facial threads.
  • To compare the lifting mechanisms and efficacy of different thread types.
  • To identify optimal strategies for facial rejuvenation using barbed threads.

Main Methods:

  • Review of literature on facial thread lifting techniques.
  • Analysis of mechanical principles and lifting mechanisms of U-shaped and I-shaped threads.
  • Comparison of clinical outcomes, success rates, and complication profiles.

Main Results:

  • U-shaped threads offer strong lifting (85-90% success) but have higher complication rates (bleeding, dimpling, tissue damage).
  • I-shaped threads have lower complication rates (<5%) with less dramatic lifting effects and improved patient comfort.
  • Distinct characteristics and applications exist for each thread type.

Conclusions:

  • Optimal facial rejuvenation results are achieved through careful patient selection and customized combination approaches.
  • Reliance on a single thread type may not yield the best outcomes.
  • Future research should focus on hybrid techniques combining strengths of both thread types to maximize efficacy and minimize risks.