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Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a result, EDTA...

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Micro-dissection of Enamel Organ from Mandibular Incisor of Rats Exposed to Environmental Toxicants
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Published on: March 29, 2018

Effect of simulated debracketing on enamel damage.

Ming-Zen Su1, Eddie Hsiang-Hua Lai, Jenny Zwei-Chieng Chang

  • 1Department of Orthodontics, School of Dentistry, National Taiwan University and National Taiwan University Hospital, Taipei, Taiwan.

Journal of the Formosan Medical Association = Taiwan Yi Zhi
|October 24, 2012
PubMed
Summary
This summary is machine-generated.

The squeezing and tensile debracketing techniques are safe for enamel, with minimal adhesive remnants. The shearing method, however, risks enamel damage due to higher forces and fractures.

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Area of Science:

  • Dental Materials Science
  • Orthodontic Technology
  • Biomaterials Engineering

Background:

  • Maintaining a smooth enamel surface post-bracket removal is crucial for aesthetics and plaque prevention.
  • Evaluating enamel damage from debracketing is essential for safe orthodontic treatment.

Purpose of the Study:

  • To assess enamel damage resulting from three distinct, standardized debracketing techniques.
  • To compare the effectiveness and safety of squeezing, shearing, and tensile debracketing methods.

Main Methods:

  • Three debracketing simulation devices were used: How Plier (squeezing), Direct Bond Bracket Remover (shearing), and Lift-Off Instrument (tensile).
  • Optical stereomicroscopy and computerized image analysis quantified remnant adhesive area (RAE).
  • Scanning electron microscopy analyzed enamel surface fractography.

Main Results:

  • Squeezing method: highest force (54.3 N), least enamel damage (RAE 99.5%).
  • Tensile method: lowest force (6.8 N), minimal damage (RAE 98.7%).
  • Shearing method: higher force (32.0 N), significant enamel damage (RAE 77.3%), and enamel prism fractures in 3 specimens.

Conclusions:

  • Squeezing and tensile debracketing methods are clinically acceptable for preserving enamel integrity.
  • The shearing method, particularly with the Direct Bond Bracket Remover, poses a risk of enamel damage due to potential shearing failure.