Enhanced apatite formation on Ti metal heated in PO2-controlled nitrogen atmosphere

Hashimoto, Masami; Hayashi, Kazumi; Kitaoka, Satoshi

doi:10.1016/j.msec.2013.06.003

Cited by 19 publications

(11 citation statements)

References 24 publications

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“…NaOH and heat treatments [4], hydrogen peroxide and heat treatments [5], anodic oxidation [6], and autoclave treatment [7] have been proposed for such surface modification. The crystal structure of the titanium oxide [8], amount and acidity of Ti-OH groups [9,10], ability of Ca 2+ to be released from Ti [11], and amount of surface lattice vacancies [12] have also been suggested as factors governing apatite formation in Ti-based materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of metallographic structure and machining process on the apatite-forming ability of sodium hydroxide- and heat-treated titanium

Miyazaki

Sasaki

Shirosaki

et al. 2017

BME

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Although titanium (Ti) is clinically used for hard tissue reconstruction, it has low bone-bonding ability, i.e. bioactivity. Materials able to deposit apatite on their surfaces within the body is considered to exhibit bioactivity. Effects of the metallographic structure and machining process of Ti on its apatite-forming ability remains unclear. In this study, Ti substrates subjected to various preheating and machining processes were then subjected to NaOH and heat treatments. The apatite-forming abilities of resulting Ti were examined in simulated body fluid (SBF). Preheating of the Ti decreased its reactivity with NaOH solution. When quenched or annealed Ti was subjected to NaOH and heat treatments, the induction period for apatite formation in SBF slightly increased. This was attributed to a decrease in sodium titanate and increase in rutile on the Ti surface after the treatments. Substrates subjected to wire-electrical-discharge machining did not form apatite. This was attributed to the inhibition of PO43- adsorption on their surfaces following Ca2+ adsorption, which is an essential process for apatite nucleation. Contamination of Ti surface by components of the brass wire used in the machining contributed to the inhibition. The bioactivity of surface-modified Ti was therefore significantly affected by its thermal treatment and machining process.

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Section: Introductionmentioning

confidence: 99%

Effect of metallographic structure and machining process on the apatite-forming ability of sodium hydroxide- and heat-treated titanium

Miyazaki

Sasaki

Shirosaki

et al. 2017

BME

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“…The induction periods of apatite formation on the acid treated Ti were longer than 7 days in many cases [ 4 , 5 , 6 ], whereas they decreased to be shorter than 3 days when Ti was subsequently heat treated at moderate temperature or soaked in nitric acid solution for a long period of time [ 6 , 7 ]. Surface roughness, crystalline phases of anatase and rutile, amount of hydroxyl groups, surface potential and so forth have been thought to be the important factors for apatite formation on Ti [ 4 , 5 , 6 , 7 , 9 , 10 ]. Among them, recent research reported that surface potential is a dominant factor of apatite formation in pure Ti [ 4 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…Surface roughness, crystalline phases of anatase and rutile, amount of hydroxyl groups, surface potential and so forth have been thought to be the important factors for apatite formation on Ti [ 4 , 5 , 6 , 7 , 9 , 10 ]. Among them, recent research reported that surface potential is a dominant factor of apatite formation in pure Ti [ 4 , 9 ]. However, studies on acid- and heat-treated Ti alloys are scarce, and the impact of surface potential on apatite formation in Ti alloys subjected to acid and heat treatments remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Impact of Surface Potential on Apatite Formation in Ti Alloys Subjected to Acid and Heat Treatments

et al. 2017

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Titanium metal (Ti) and its alloys are widely used in orthopedic and dental fields. We have previously shown that acid and heat treatment was effective to introduce bone bonding, osteoconduction and osteoinduction on pure Ti. In the present study, acid and heat treatment with or without initial NaOH treatment was performed on typical Ti-based alloys used in orthopedic and dental fields. Dynamic movements of alloying elements were developed, which depended on the kind of treatment and type of alloy. It was found that the simple acid and heat treatment enriched/remained the alloying elements on Ti–6Al–4V, Ti–15Mo–5Zr–3Al and Ti–15Zr–4Nb–4Ta, resulting in neutral surface charges. Thus, the treated alloys did not form apatite in a simulated body fluid (SBF) within 3 days. In contrast, when the alloys were subjected to a NaOH treatment prior to an acid and heat treatment, alloying elements were selectively removed from the alloy surfaces. As a result, the treated alloys became positively charged, and formed apatite in SBF within 3 days. Thus, the treated alloys would be useful in orthopedic and dental fields since they form apatite even in a living body and bond to bone.

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“…13.1306120 In recent years, new surface treatment methods have been developed to improve biological characteristics of biomaterials such as Ti alloy, which is used in the medical field. Several studies have reported that TiN coatings and nitriding of Ti alloys improved biocompatibility [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. For example, Lin et al determined that a TiN layer can inhibit the adhesive property of mutans streptococcus [1].…”

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confidence: 99%

“…To evaluate the formation ability of calcium phos- Table 1. The immersion test is a typical method for examining the hard-tissue compatibility of materials in vitro [14,[37][38][39][40][41][42], in which the deposition properties of calcium phosphate are compared. The volume of the solution for each sample was 12 mL.…”

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confidence: 99%

Investigation on Hard-Tissue Compatibility of TiN Surface Formed by Atmospheric-Pressure-Plasma Nitriding

Sannomiya

Ichiki

Otani

et al. 2018

Plasma and Fusion Research

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In this study, we demonstrated the improvement in the biocompatibility of titanium alloy by atmosphericpressure-plasma nitriding, in which the pulsed-arc plasma jet is sprayed onto a titanium alloy to form TiN surface. The deposition properties of calcium phosphate on different samples were compared after immersion in simulated body fluid to investigate hard-tissue compatibility. It was determined that the growth of the calcium phosphate layer on the nitrided sample was the most rapid. This result suggests that atmospheric-pressure-plasma nitriding has the potential to easily improve the hard-tissue compatibility of titanium alloy.

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Enhanced apatite formation on Ti metal heated in PO2-controlled nitrogen atmosphere

Cited by 19 publications

References 24 publications

Effect of metallographic structure and machining process on the apatite-forming ability of sodium hydroxide- and heat-treated titanium

Effect of metallographic structure and machining process on the apatite-forming ability of sodium hydroxide- and heat-treated titanium

Impact of Surface Potential on Apatite Formation in Ti Alloys Subjected to Acid and Heat Treatments

Investigation on Hard-Tissue Compatibility of TiN Surface Formed by Atmospheric-Pressure-Plasma Nitriding

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