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Removable partial denture alloys processed by laser-sintering technique.

Omar Alageel1,2, Mohamed-Nur Abdallah1, Ammar Alsheghri3

  • 1Faculty of Dentistry, McGill University, Montreal, Quebec, Canada.

Journal of Biomedical Materials Research. Part B, Applied Biomaterials
|June 1, 2017
PubMed
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Laser-sintered cobalt-chromium alloys offer superior precision and mechanical properties for removable partial dentures (RPDs) compared to traditional casting methods. These advanced additive manufacturing techniques enhance RPD framework fabrication.

Area of Science:

  • Biomaterials Engineering
  • Additive Manufacturing
  • Dental Prosthetics

Background:

  • Traditional removable partial denture (RPD) frameworks rely on casting techniques.
  • Additive manufacturing, specifically laser sintering, presents a novel, cost-effective alternative for RPD framework fabrication.

Purpose of the Study:

  • To evaluate and compare the mechanical, physical, and biocompatibility properties of cobalt-chromium (Co-Cr) alloys for RPDs fabricated using two laser-sintering systems versus traditional casting.

Main Methods:

  • Co-Cr alloys were processed using selective laser sintering (SLS) and direct metal laser sintering (DMLS) via Phenix (L-1) and EOS (L-2) systems.
  • Comparison involved assessing precision, hardness, yield strength, fatigue resistance, and porosity against traditional casting (CC) methods.
Keywords:
biocompatibilitycobalt-chromium (Co-Cr)fatigue resistancelaser-sinteringremovable partial dentures

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Main Results:

  • Laser-sintered (L-1, L-2) techniques demonstrated significantly higher precision (8x and 3.5x) than casting (CC).
  • L-1 and L-2 alloys exhibited enhanced hardness (14-19%), yield strength (10-13%), and fatigue resistance (71-72%) compared to CC.
  • All alloys showed low porosity, with laser-sintered materials having more homogenous pore distribution.

Conclusions:

  • Laser-sintered Co-Cr alloys offer superior precision and mechanical performance for RPD frameworks over cast alloys.
  • Both laser-sintered and cast Co-Cr alloys demonstrated biocompatibility for dental applications.