Metallographic characterization of overdenture bars manufactured by overcasting abutments for dental implants

Authors

  • Anthony Molina Universidad del Valle
  • Diana Echeverri Universidad del Valle
  • Maritza Parra Universidad del Valle
  • Irvin J. Castro Universidad del Valle
  • Herney Garzón Universidad del Valle
  • Carlos H. Valencia Universidad del Valle
  • Gilberto Olave Universidad del Valle

Keywords:

Dental implants, Overdentures, Metallography, Segregation

Abstract


Introduction: the difficulty in handling conventional dentures in fully edentulous patients may be improved by using anchorage systems on dental implants for overdentures. The goal of this study was to conduct a metallographic characterization of a system of bars for overdentures by overcasting a metal base alloy on prefabricated titanium alloy abutments. Methods: using a design of overdenture bars, made with an addition of prefabricated titanium (Ti-6Al-4V) and a metal base alloy (Ni65-Cr22%,5%-Mo9,5%), a metallographic characterization of the overcasting process was performed by analyzing its influence on the microstructure of two commercial dental alloys: Ti-6Al-4V and Ni65%-Cr22,5%-Mo9,5% (Wiron 99) using scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), light microscopy analysis (LM), and stereomicroscopy (EM). Results: the findings suggest that during overcasting a chemical bonding occurs due to the presence of oxygen between these two alloys, showing heterogeneous dendritic structures along the samples due to thickness irregularities on the bars and to precipitations of their molybdenum borders. Conclusions: from a metallographic perspective, the chemical bonding of the two alloys (Ni65-Cr22%, 5%-Mo9, 5% and Ti-6Al-4V) after overcasting suggests that overcasting between these two alloys is a viable option for placing structures on implant abutments.

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Author Biographies

Anthony Molina, Universidad del Valle

Materials Engineering Student, Universidad del Valle, Cali (Colombia)

Diana Echeverri, Universidad del Valle

Graduate Intern. Specialization in Oral Rehabilitation. Universidad del Valle, Cali (Colombia)

Maritza Parra, Universidad del Valle

Graduate Intern. Specialization in Oral Rehabilitation. Universidad del Valle, Cali (Colombia)

Irvin J. Castro, Universidad del Valle

Materials Engineer. MA with a focus in Materials Engineering. Universidad del Valle. Professor, School of Materials Engineering, Universidad del Valle, Cali (Colombia)

Herney Garzón, Universidad del Valle

Oral Rehabilitation Specialist, Universidad Militar Nueva Granada, Fundación CIEO. Professor, Specialization in Oral Rehabilitation, Universidad del Valle, Cali (Colombia).

Carlos H. Valencia, Universidad del Valle

Oral Implants and Reconstructive Dentistry Specialist, Universidad Militar Nueva Granada, Fundación CIEO. Professor, Specialization in Oral Rehabilitation, Universidad del Valle, Cali (Colombia)

Gilberto Olave, Universidad del Valle

Oral and Maxillofacial Implants Specialist, Universidad de Chile. Professor, Specialization in Oral Rehabilitation, Universidad del Valle, Cali (Colombia)

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Published

2014-01-13

How to Cite

Molina, A., Echeverri, D., Parra, M., Castro, I. J., Garzón, H., Valencia, C. H., & Olave, G. (2014). Metallographic characterization of overdenture bars manufactured by overcasting abutments for dental implants. Revista Facultad De Odontología Universidad De Antioquia, 25(1), 26–43. Retrieved from https://revistas.udea.edu.co/index.php/odont/article/view/11549