Annealing of Co-Cr dental alloy: effects on nanostructure and Rockwell hardness

The Journal of Advanced Prosthodontics
Simel AyyıldızHasan Suat Gökçe

Abstract

The aim of the study was to evaluate the effect of annealing on the nanostructure and hardness of Co-Cr metal ceramic samples that were fabricated with a direct metal laser sintering (DMLS) technique. Five groups of Co-Cr dental alloy samples were manufactured in a rectangular form measuring 4 × 2 × 2 mm. Samples fabricated by a conventional casting technique (Group I) and prefabricated milling blanks (Group II) were examined as conventional technique groups. The DMLS samples were randomly divided into three groups as not annealed (Group III), annealed in argon atmosphere (Group IV), or annealed in oxygen atmosphere (Group V). The nanostructure was examined with the small-angle X-ray scattering method. The Rockwell hardness test was used to measure the hardness changes in each group, and the means and standard deviations were statistically analyzed by one-way ANOVA for comparison of continuous variables and Tukey's HSD test was used for post hoc analysis. P values of <.05 were accepted as statistically significant. The general nanostructures of the samples were composed of small spherical entities stacked atop one another in dendritic form. All groups also displayed different hardness values depending on the manufacturing techn...Continue Reading

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Citations

May 9, 2015·Materials Science & Engineering. C, Materials for Biological Applications·Simel Ayyıldız
Sep 9, 2015·Journal of Prosthodontic Research·Mehmet Selim Bilginİbrahim Ersoy
Jun 12, 2016·Materials Science & Engineering. C, Materials for Biological Applications·Ling RenKe Yang
Oct 22, 2015·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Swee Leong SingFlorencia Edith Wiria
Nov 9, 2016·Journal of Prosthodontic Research·Toyoki NakataChikahiro Ohkubo
Oct 3, 2017·Journal of Applied Biomaterials & Functional Materials·Francesco TrevisanDiego Manfredi
Feb 28, 2015·The Journal of Advanced Prosthodontics·John KokolisSpiros Zinelis
Feb 13, 2018·Journal of Prosthodontic Research·Mana ToriiChikahiro Ohkubo
May 2, 2018·The Journal of Advanced Prosthodontics·Faruk EmirCem Sahin
Feb 22, 2021·The Journal of Prosthetic Dentistry·Cosmin CosmaNicolae Balc

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Methods Mentioned

BETA
X-ray
thermal treatment

Software Mentioned

IGOR Pro
SPSS

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