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Related Concept Videos

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...

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Updated: Jun 15, 2026

Chronic Implantation of Multiple Flexible Polymer Electrode Arrays
08:54

Chronic Implantation of Multiple Flexible Polymer Electrode Arrays

Published on: October 4, 2019

Evaluation of alternative polymer bracket materials.

Julia Krauss1, Andreas Faltermeier, Michael Behr

  • 1Department of Orthodontics, University Medical Centre of Regensburg, Regensburg, Germany.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|March 4, 2010
PubMed
Summary
This summary is machine-generated.

Polyoxymethylene demonstrated superior mechanical properties, including high fracture toughness and hardness, making it the best polymer bracket material. High-density polyethylene showed excessive wear and low toughness, deeming it unsuitable.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Orthodontics

Background:

  • Polymer dental brackets face challenges with wear resistance and hardness.
  • Investigating alternative polymers is crucial for improving bracket performance.

Purpose of the Study:

  • To evaluate the mechanical properties of urethane-dimethacrylate, high-density polyethylene, and an experimental bracket polymer (EBP).
  • To compare these materials against polycarbonate and polyoxymethylene control brackets.

Main Methods:

  • Mechanical properties were assessed after thermocycling and simulated chewing.
  • Tests included medium-wear, fracture toughness, and Vickers hardness.

Main Results:

  • High-density polyethylene exhibited the highest wear and lowest toughness/hardness.
  • Urethane-dimethacrylate and EBP showed better mechanical properties than polycarbonate.
  • Polyoxymethylene demonstrated the best fracture toughness, hardness, and lowest wear.

Conclusions:

  • High-density polyethylene is unsuitable for bracket applications due to poor wear resistance and fracture toughness.
  • Polyoxymethylene emerged as the superior material based on mechanical testing performance.