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Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
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Related Experiment Video

Updated: Jan 24, 2026

Isolating Stem Cells from Soft Musculoskeletal Tissues
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Nasal dorsum augmentation using soft tissue filler injection.

Won Lee1, Ji-Soo Kim2, Wook Oh3

  • 1Yonsei E1 Plastic Surgery Clinic, Anyang, South Korea.

Journal of Cosmetic Dermatology
|June 4, 2019
PubMed
Summary

Ultrasound revealed the dorsal nasal artery

Keywords:
augmentation rhinoplastydorsal nasal arteryhyaluronic acid Fillervascular compromise

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Area of Science:

  • Plastic Surgery
  • Anatomy
  • Medical Imaging

Background:

  • Soft tissue filler injections are common for augmentation rhinoplasty.
  • Techniques vary regarding needle size, injection depth, and vascular considerations.
  • Understanding nasal artery anatomy is crucial for safe augmentation.

Purpose of the Study:

  • To evaluate the dorsal nasal artery's course in patients undergoing filler rhinoplasty.
  • To propose a safer augmentation method by mapping blood vessels with ultrasound.

Main Methods:

  • Augmentation rhinoplasty using soft tissue fillers.
  • Pre-injection ultrasound examination of all patients.

Main Results:

  • Ultrasound performed on 50 patients before augmentation rhinoplasty.
  • Dorsal nasal artery found laterally in 80% and midline in 20%.
  • Artery located beneath the preperiosteal layer (8%) or subdermal layer (14%).

Conclusions:

  • Injecting fillers into the preperiosteal layer is relatively safe but carries vascular risks.
  • A large cannula and gentle injection into the preperiosteal layer is recommended.
  • Minimizing vessel damage is key for safe soft tissue filler rhinoplasty.