Effect of powder loading on local feedstock injection behavior for fabrication process of orthodontic bracket SS 17-4 PH using metal injection molding

B. Suharno, F. A. Mawardi, S. Dewantoro, B. Irawan, M. Doloksaribu, S. Supriadi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Citations (Scopus)

Abstract

The need for orthodontic brackets in Indonesia is very high due to the high prevalence of malocclusion sufferers in Indonesia. Metal Injection Molding is one of fabrication methods that can be used by obtaining an optimum powder loading in order to produce good feedstock quality for manufacturing orthodontic bracket products. A higher powder loading was able to improve the mechanical properties and tighten dimensional tolerances of products by increasing its density. However, excessive number of powder loading leads to exorbitant viscosity of the feedstock and results in failure of injection process. The aim of this study was to evaluate the performance of Stainless Steel 17-4 PH orthodontic bracket fabrication process, so that the optimum powder loading for local bracket orthodontic manufacturing process could be obtained. In this study, SS 17-4 PH and local binder system (i.e. beeswax, paraffin wax, low linear density polyethylene, ethylene vinyl acetate, and stearic acid with 30, 30, 30, 5, and 5 vol.%, respectively) were used to prepare four kinds of feedstocks at powder loading of 60, 62, 64, and 66 vol.%. The feedstocks were injected into the orthodontic bracket mold and observed the effect on their rheological properties. The results showed that the feedstock with powder loading of 64 wt.% was the optimum one, with optimum torque value of 5.4 Nm resulted from the mixing process that produced green parts with a good shape stability and minimum defects when injection molded.

Original languageEnglish
Title of host publication3rd Biomedical Engineering''s Recent Progress in Biomaterials, Drugs Development, and Medical Devices
Subtitle of host publicationProceedings of the International Symposium of Biomedical Engineering, ISBE 2018
EditorsPraswasti P.D.K. Wulan, Misri Gozan, Sotya Astutiningsih, Ghiska Ramahdita, Radon Dhelika, Prasetyanugraheni Kreshanti
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735418226
DOIs
Publication statusPublished - 9 Apr 2019
Event3rd International Symposium of Biomedical Engineering''s Recent Progress in Biomaterials, Drugs Development, and Medical Devices, ISBE 2018 - Jakarta, Indonesia
Duration: 6 Aug 20188 Aug 2018

Publication series

NameAIP Conference Proceedings
Volume2092
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference3rd International Symposium of Biomedical Engineering''s Recent Progress in Biomaterials, Drugs Development, and Medical Devices, ISBE 2018
Country/TerritoryIndonesia
CityJakarta
Period6/08/188/08/18

Keywords

  • binder systems
  • feedstock
  • Metal Injection Molding (MIM)
  • orthodontic bracket
  • powder loading

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