Processing, characterization, and in vitro/in vivo evaluations of powder metallurgy processed Ti-13Nb-13Zr alloys

Marco C. Bottino, Paulo G. Coelho, Vinicius A.R. Henriques, Olga Z. Higa, Ana H.A. Bressiani, José C. Bressiani

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

This article presents details of processing, characterization and in vitro as well as in vivo evaluations of powder metallurgy processed Ti-13Nb-13Zr samples with different levels of porosity. Sintered samples were characterized for density, crystalline phases (XRD), and micro-structure (SEM and EDX). Samples sintered at 1000°C showed the highest porosity level (∼30%), featuring open and interconnected pores ranging from 50 to 100 uμm in diameter but incomplete densification. In contrast, samples sintered at 1300 and 1500°C demonstrated high densification with 10% porosity level distributed in a homogeneous microstructure. The different sintering conditions used in this study demonstrated a coherent trend that is increase in temperature lead to higher sample densification, even though densification represents a drawback for bone ingrowth. Cytotoxicity tests did not reveal any toxic effects of the starting and processed materials on surviving cell percentage. After an 8-week healing period in rabbit tibias, the implants were retrieved, processed for nondecalcified histological evaluation, and then assessed by backscattered electron images (BSEI-SEM) and EDX. Bone growth into the microstructure was observed only in samples sintered at 1000°C. Overall, a close relation between newly formed bone and all processed samples was observed.

Original languageEnglish (US)
Pages (from-to)689-696
Number of pages8
JournalJournal of Biomedical Materials Research - Part A
Volume88
Issue number3
DOIs
StatePublished - Mar 1 2009

Keywords

  • Cytotoxicity
  • Osseointegration
  • Powder metallurgy
  • Sintering
  • Titanium alloys

ASJC Scopus subject areas

  • Ceramics and Composites
  • Biomaterials
  • Biomedical Engineering
  • Metals and Alloys

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