Fractographic analysis of two fractured removable partial denture metal frameworks

Authors

DOI:

https://doi.org/10.33448/rsd-v10i10.18370

Keywords:

Chromium alloys; Cobalt; Removable partial denture; Scanning electron microscopy.

Abstract

This study aimed to analyze two cases of fracture of the metal framework of Co-Cr-based removable partial dentures, using fractography to identify a true cause of these failures. The first case concerned the coupling between the smaller and larger connectors; the patient brought his fractured removable partial dentures to the clinic. The second case referred to a larger connector; structure of the patient fractured during the test.  For failure analysis, images of two fractured metal frameworks were taken by scanning electron microscopy to identify the origin of the fracture and to determine the mechanisms involved in the process. Subsequently, energy dispersive X-ray spectroscopy was used for elemental chemical mapping of the fracture interface. The fractography indicated material fatigue as a possible cause in the first case and an error in the casting process in the second. The energy dispersive X-ray spectroscopy test, performed in the specimen of case B, showed predominant and characteristic peaks for Co and Cr, with a higher concentration of chromium. The fractures identified were associated with inclusions and with material fatigue and a number important characteristics were evidenced by the technique.

References

Al Jabbari Y. S. (2014). Physico-mechanical properties and prosthodontic applications of Co-Cr dental alloys: a review of the literature. J Adv Prosthod ; 6: 138-45.

Bates, J. F. (1965). Studies related to the fracture of partial dentures. Flexural fatigue of a cobalt-chromium alloy. Brit Dent J; 118: 532-537.

Ben-ur, Z. (1986). The fracture of cobalt-chromium alloy removable partial dentures. Quintess Int 1986; 17: 797-801.

Blackman R, Barghi N & Trail C. (1991). Dimensional changes in casting titanium removable partial denture frameworks. J Prosthet Dent; 65: 309-15.

Bridgeport D.A, Brantley W.A & Herman P.F. (1993). Cobalt-chromium and nickel-chromium alloys for removable prosthodontics. Part 1: mechanical properties. J Prosthod; 2:144-50.

Carr A.B & Brown D.T. (2011). Mc Cracken’s Removable Partial Prosthodontics. 12.ed. Mosby; 400.

Craig R.G, Hanks C.T, Kohn D.H, Koran A Ill, O'Brien W.J, Peyton F.A & et al. (1993). Restorative dental materials. 9th ed. St Louis: CV Mosby. p. 55-105, 415-49.

Earnshaw R. (1961). Fatigue tests on a dental cobalt-chromium alloy. Br Dent J; 110: 341-6.

Earnshaw R. (1958). The casting shrinkage of cobalt-chromium alloys. Aust Dent; 3:159-170.

Erdle R.W & Prange C.H U.S. patent 1956278. (1934). Apud American Dental Association. Guide to dental materials: including A.D.A. specification n. 14 for dental Co-Cr castings alloys. Chicago: A.D.A., /63; 78-88.

Ghani F & Mahood M. (1990). A laboratory examination of the behavior of cast cobalt-chromium clasps. J Oral Rehabil; 17: 229-37.

Harcourt H. J. (1961). Fractures of cobalt-chromium castings. Br Dent J; 110: 43-50.

Lewis A. J. (1978). Radiographic evaluation of porosities in removable partial denture castings. J Prosthet Dent; 39: 278-281.

Machado-Cucci A. L, Fuller J. B, Giampaolo E. T & Leonardi P. (1990). Fatigue of retentive clasps of removable partial dentures. Effect of alloys, thickness and casting techniques. 2. Rev Odontol Unesp; 19: 251-8.

Morris H. F, Farah J. W, Craig R.G & Hood J. A. (1976). Stress distribution within circumferential clasp arms. J Oral Rehabil; 3: 387-94.

Noort R. V & Lamb D. J. (1984). A scanning electron microscope study of Co-Cr partial dentures fractured in service. J Dent; l2: 122-6.

Paffenbarger G. C, Caul D. J & Dickson G. (1943). Base metal alloys for oral restorations. J Am Dent Ass; 30: 852-862.

Pang Z, Chughtai A, Sailer I & Zhang Y. (2015). A fractographic study of clinically retrieved zirconia-ceramic and metal-ceramic fixed dental prostheses. Dent Mater; 31: 1198-206.

Phillips R. W. (1991). Skinner’s science of dental materials. 9 ed. Philadelphia: WB Saunders Co. p. 40.

Vallittu P.K. (1997). Transverse strength, ductility, and qualitative elemental analysis of cobalt chromium alloy after various durations of induction melting. J Prosthodont.; 6:55-60.

Wouters R & Froyen L. (1997). Materials characterization. Elsevier Science Inc; 25-41

Downloads

Published

04/08/2021

How to Cite

BARBOSA, J. da S.; LIMA, E. D. de; MELO, J. B. C. A. de; BATISTA, A. U. D. .; SILVA NETO, J. P. .; SILVA, H. F. V. .; SILVA, T. V. S. da; ASSUNÇÃO , M. G. de; BAGGIO, A. M. P. .; QUEIROZ, J. R. C. . Fractographic analysis of two fractured removable partial denture metal frameworks. Research, Society and Development, [S. l.], v. 10, n. 10, p. e08101018370, 2021. DOI: 10.33448/rsd-v10i10.18370. Disponível em: https://rsdjournal.org/index.php/rsd/article/view/18370. Acesso em: 27 oct. 2021.

Issue

Section

Health Sciences