Application of Plasma Electrolytic Oxidation Coating on Powder Metallurgy Ti-6Al-4V for Dental Implants

Cristina Garcia-Cabezón,Arturo Ibañez Fonseca,Bayon Raquel,Vicente Amigo Borrás,María Luz Rodriguez-Mendez,Fernando Martin-Pedrosa,Jose Carlos Rodriguez Cabello

doi:10.3390/met10091167

Abstract

Ti-6Al-4V alloy obtained by powder metallurgy (PM) is a good candidate biomaterial in the manufacture of dental implants but its inherent porosity makes it have worse corrosion behavior than conventionally obtained alloys. In order to improve the corrosion and biological properties, surface modification technologies could be used. The plasma electrolytic oxidation (PEO) process is a novelty process successfully used in case of conventional titanium alloys. The present work investigates the effect of PEO treatment on PM Ti-6Al-4V alloy using two electrolytes. Both coatings show good adherence and improved corrosion behavior in artificial saliva, the PEO coatings delivers a steady growth of corrosion resistance from day one until 90 days immersion. Highest corrosion resistance was shown in case of Ca/P enrichment PEO coatings. The cytocompatibility tests indicated these coatings seem to be appropriate to improve the bone osseointegration with proper porosity index.

Highlights

The Ti-6Al-4V alloy is the most widely used titanium alloy in orthopedics and dental implants [1]due to its high strength-to-weight ratio, good fatigue strength and toughness and anti-magnetic properties
For plasma electrolytic oxidation (PEO) sample a mixture of sodium titanium phosphate and titanium phosphate were identified while for PEO-Ca/P sample the intensity of calcium phosphate peaks was the highest
PEO of Ti-6Al-4V alloy obtained by powder metallurgy (PM) was studied in two electrolytes with different Ca and

Summary

Introduction

The Ti-6Al-4V alloy is the most widely used titanium alloy in orthopedics and dental implants [1]due to its high strength-to-weight ratio, good fatigue strength and toughness and anti-magnetic properties. The first one is the stress shielding problem as consequence of differences between the elastic modulus of bone and biomaterial and the associated bone resorption [2] which is one of the main causes of failure in implants [3,4]. Porous materials can result in faster and more complete growth of the bone, which in return results in greater strength at the implant pores. Such increase could allow for a homogeneous transfer of stress between the bone and the implant [5,6,7]

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