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Collar Bearings01:23

Collar Bearings

Collar bearings are essential in various machines designed to support axial loads on rotating shafts. Depending on the specific application and requirements, they can be found with single or multiple collars.

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Related Experiment Video

Updated: Jul 12, 2026

Multi-Scale Modification of Metallic Implants With Pore Gradients, Polyelectrolytes and Their Indirect Monitoring In vivo
12:19

Multi-Scale Modification of Metallic Implants With Pore Gradients, Polyelectrolytes and Their Indirect Monitoring In vivo

Published on: July 1, 2013

Two-piece implants with turned versus microtextured collars.

Jan Cosyn1, Mehran Moradi Sabzevar, Peter De Wilde

  • 1Department of Periodontology, School of Dental Medicine, Free University of Brussels (VUB), Brussels, Belgium. jan.cosyn@vub.ac.be

Journal of Periodontology
|September 1, 2007
PubMed
Summary

Microtextured implant collars may not preserve bone or improve soft tissue integration as claimed. Current evidence is inconclusive, and potential risks for peri-implant pathology remain unknown.

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Area of Science:

  • Dental Implantology
  • Biomaterials Science
  • Periodontology

Background:

  • Two-piece dental implants with microtextured collars are marketed for enhanced hard and soft tissue preservation.
  • The scientific rationale behind these features, particularly regarding crestal bone stability and soft tissue attachment, requires critical evaluation.

Purpose of the Study:

  • To critically assess the current evidence supporting the use of microtextured implant collars for hard tissue preservation and soft tissue integration.
  • To evaluate the impact of microtextured implant necks on crestal bone remodeling and peri-implant soft tissue characteristics.

Main Methods:

  • Review and analysis of available comparative studies on dental implants with microtextured vs. smooth implant necks.
  • Evaluation of factors influencing crestal bone remodeling, such as biologic width establishment.
  • Assessment of collagen fiber orientation and attachment in peri-implant mucosa based on surface topography.

Main Results:

  • Current comparative studies do not provide clear evidence that microroughened implant necks reduce crestal bone loss.
  • The potential benefits of microtexturing may be negated by biologic width formation and other bone remodeling factors.
  • Surface roughness variations at the implant neck level influence collagen fiber attachment and orientation in the peri-implant mucosa.

Conclusions:

  • The purported benefits of microtextured implant collars for hard tissue preservation are not conclusively supported by existing data.
  • Clinicians should exercise caution when using implants with microtextured collars due to unknown effects on peri-implant pathology initiation and progression.