Evaluation of ceramic flexural strength of a cobalt-chromium alloy subjected to airborne particle abrasion and tungsten inert gas welding

Keywords: Dental materials, Dental soldering, Dental porcelain.


Aim: The aim of this study was to evaluate the influence of tungsten inert gas (TIG) welding and airborne particle abrasion using aluminum oxide particles on the flexural strength of a joint between ceramic and cobalt-chromium alloys. Methods: The specimens were cast and welded using TIG, then divided into 6 groups (n = 10) and subjected to blasting with 250 μm, 100 μm, and 50 μm aluminum oxide particles. Ceramic systems were applied to the central part of all specimens. A three-point bending test using a velocity of 0.5 mm/m was performed on the specimens to measure flexural strength. Data were analyzed using two-way analysis of variance and Tukey’s test. Results: TIG welding demonstrated the lowest resistance compared with the non-welded groups. Airborne particle abrasion using 250 μm aluminum oxide particles demonstrated greater resistance in the welded groups (p < 0.05). Mixed faults were found in all specimens. Conclusion: TIG welding decreased the bond strength, and the particle size of aluminum oxide did not affect the metal-ceramic bond in groups without TIG welding.


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Author Biographies

Laise Pena Braga Monteiro, Federal University of Pará

Master student in the Postgraduate Program in Dentistry at the Federal University of Pará.

Issae Sousa Sano, Federal University of Pará

Graduated from the Faculty of Dentistry of the Federal University of Pará, specialist in Dental Prosthesis at PROFIS-Bauru. Experience in Dental Clinic.

Suelen Reis Cunha, Federal University of Pará

Department of Prosthodontics, Dentistry College, Federal University of Pará (UFPA), Belém, Pará, Brazil.

Eliza Burlamaqui Klautau, Federal University of Pará

Doctorate in Dentistry, University of São Paulo. Assistant Professor III of the Federal University of Pará.

Bruno Pereira Alves, Federal University of Pará

Department of Prosthodontics, Dentistry College, Federal University of Pará (UFPA), Belém, Pará, Brazil.


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How to Cite
Monteiro, L. P. B., Issae Sousa Sano, Cunha, S. R., Klautau, E. B., & Alves, B. P. (2019). Evaluation of ceramic flexural strength of a cobalt-chromium alloy subjected to airborne particle abrasion and tungsten inert gas welding. Brazilian Journal of Oral Sciences, 18, e191443. https://doi.org/10.20396/bjos.v18i0.8656599