International Journal of Prosthodontics and Restorative Dentistry

Register      Login

VOLUME 1 , ISSUE 1 ( April-June, 2011 ) > List of Articles

RESEARCH ARTICLE

Mechanical Properties of Co-Cr Alloys for Metal Base Framework

Andreja Carek, Jasenka Zivko Babic, Zdravko Schauperl, Tomislav Badel

Citation Information : Carek A, Babic JZ, Schauperl Z, Badel T. Mechanical Properties of Co-Cr Alloys for Metal Base Framework. Int J Prosthodont Restor Dent 2011; 1 (1):13-19.

DOI: 10.5005/jp-journals-10019-1003

Published Online: 01-03-2013

Copyright Statement:  Copyright © 2011; The Author(s).


Abstract

Purpose

This study investigated the effect of two welding methods on the mechanical properties of a cobalt-chromium (Co-Cr) alloy for metal base framework.

Materials and methods

Fifty-four plates were cast for TIG and laser welding. Cobalt-chromium for plates were prepared and divided into three groups of 18 samples. Group 1 and 2 were cut at the center of the plate. Eighteen specimens were joint by using TIG (Primotec Phaser Mx1), and other 18 by laser (Nd:YAG laser). Specimens in the as-cast condition were used as control group (group 3). After joining, each specimen was microscopic analyzed and tested to flexural and dynamic failure. Failure loads were recorded and fracture strength calculated.

Results

The changes in microstructure and micro-hardness were studied in the heat-affected zones (HAZ) and unaffected zones. Micro- hardness values increased in the heat-affected zone (HAZ) and in welded material compared to the parent material. The ANOVA test showed a highly significant difference (α = 0.05) between the joint strengths of the as-cast control specimens and, TIG and laser-welded joints. The flexural and dynamic strength of the joints were higher than those for the TIG-welded joints, and both were higher than the laser-welded joint strengths for the tested Co-Cr alloy.

Conclusions

Although laser is more popular, in our research TIG showed better results for flexural and dynamic strength.


PDF Share
  1. Microstructure analysis of base alloys joints. MED, Dublin, Ireland 2006;340-49.
  2. Influence of the partial denture on the articulation of dental and postalveolar Sounds. Collegium Antropologicum 2004;28:799-807.
  3. Mechanical properties of Co-Cr welded alloy. Journal of Dental Research 2010;89:745.
  4. Metals in dental prosthodontics. Zagreb: Školska knjiga 2005.
  5. Council on Dental Materials, Instruments, and Equipment. Journal of American Dental Association 1984;109:766.
  6. Dental materials: Properties and manipulation. St Louis: Mosby 2000.
  7. Electrochemical and mechanical properties of cobalt-chromium dental alloy joints. Materials and technology 2007;6:295-300.
  8. Quantitative thin-layer chromatographic of dental base alloys. Journal of Chromatography, Biomed Applications 1998;710:247-53.
  9. Anodic sampling and TLC identification of dental alloys. Journal of Planar Chromatography 2001;14:426-29.
  10. Cytotoxicity of precious and nonprecious alloys-experimental comparison of in vitro data from two laboratories. Journal of Biomedical Materials Research 2002;63:214-19.
  11. Identification of cobalt and chromium in prosthetic devices using thin-layerchromatography. Acta Stomatoliga Croatica 2000;34: 41-45.
  12. Determination of chromium and nickel in high alloy steel by thin-layer chromatography with anodic sampling. Journal of Planar Chromatography 1998;11:460-63.
  13. Alloys for prosthodontic restorations. Journal of Prosthetic Dentistry 2002;87:351-63.
  14. Cobalt-Chromium alloys with veneering capacity. BEGO. Bremen 2008.
  15. Bite force in subject with complete dentition. Collegium Antropologicum 2002;26:293-302.
  16. Lightening in a Bottle: State of the art loining techniques in dental technology (Part 1). Continuing Education 2004;4:110-19.
  17. Lightening in a Bottle (Part 3). Dental Dialogue 2004;4:37-51.
  18. Precision milling and partial denture constructions. International School BEGO. Bremen 2004.
  19. Lightning in a Bottle. Soldering and welding are not the same. Dental Dialogue 2005;3:52-63.
  20. Penetration depth of Nd:YAG laser into dental casting alloys. 32nd Annual Meeting and Exhibition of the AADR 2003.
  21. Laser welding of cobalt-chromium removable partial denture alloys. Journal of Prosthetic Dentinstry 1998;79:285-90.
  22. The laser welding technique applied to the nonprecious dental alloys procedure and results. British Dental Journal 2001;190:255-57.
  23. Optimization of operator and physical parameters for laser welding of dental materials. British Dental Journal 2004;196:413-18.
  24. Flexural strength of pure Ti, Ni-Cr and Co-Cr alloys submitted to Nd:YAG laser or TIG welding. British Dental Journal 2006;17:20-23.
  25. Bond strength of gold alloys laser welded to cobalt-chromium alloy. The Open Dentistry Journal 2008;2:109-13.
  26. Influence of joining methods on microstructure and properties of dental alloys. In proceedings. Matrib 2006;274-82.
  27. Characterization of laser and TIG joints of Co-Cr alloys. Acta Stomatologica Croatica 2009;43:354.
  28. Analysis of base alloy joints made by soldering and laser welding. Abstracts of 30th Annual Conference of EPA, London 2006; 19.
  29. Intraoral metal laser welding: A case report. Lasers in Medical Science 2010;25:303-07.
  30. Intra-oral laser welding: An in vitro evaluation of thermal increase. Lasers in Medical Science 2009;24:81-85.
  31. Laser welding of cast titanuim and dental alloys using argon shielding. Journal of Prosthodontics 2006;15:102-07.
  32. Mjerenje i obrada parametara zavarivanja i zvuènih signala tijekom elektroluènog zavarivanja. Strojarski fakultet u Slavonskom Brodu. Dipomski rad 2006.
  33. Control of mechanical properties in structural steel welds by numerical simulation of coupling among temperature, microstructure, and macro-mechanics. Science and Technology of Advanced Materials 2004;5: 255-66.
  34. Dimensional change of laser- welded gold alloy induced by heat. Wiley Inter Science 2004.
  35. Experimental studies of the laser welding of Co-Cr alloys using a pulsed Nd:YAG-laser. Zahn-, Mund-, und Kieferheilkunde mit Zentralblatt 1989;77:578-79.
  36. Laser in der Zahnmedizin, Quintessence 1992;32:142-72.
  37. Joint properties of cast Fe-Pt magnetic alloy laser-welded to Co-Cr alloy. Dental Materials Journal 2005;24:550-54.
  38. Mechanical properties of laser-welded dental casting alloys. IADR San Anton 2003.
  39. Laser welding of a cobalt- chromium removable partial denture alloy. Journal of Prosthetic Dentistry 1998;79:285-90.
  40. Studies on laser plasma welded titanium. Dental Materials 1993;9:104-07.
  41. Macroscopic analysis of Co-Cr base alloys joints. Acta Stomatol Croat 2007; 41:216-24.
PDF Share
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.