牙科植體用低彈性模數 TNM 合金耐蝕性之研究

Study on Corrosion Resistance of Low Elastic Modulus TNM Alloy for Dental Implants

蔡淳宇(CHUN-YU TSAI)

指導教授 ： 許學全

中臺科技大學/健康科學院/牙體技術暨材料系碩士班/碩士(2019年)

摘要

牙科植體在口腔環境中極易受到侵蝕性氟離子的影響。因此，本研究探討低彈性Ti-5Nb-5Mo(TNM)和奈米管表面TNM合金(TNM-nt)在含氟人工唾液中之耐蝕性。實驗用材料包括c.p. Ti、TNM合金和TNM-nt，使用Fusayama人工唾液加入不同含量的NaF中，進行開路電位、動態極化曲線和電化學阻抗譜，評估耐蝕性，並使用掃描電子顯微鏡（FE-SEM）、能量色散X射線光譜儀(Energy Dispersive Spectrometer , EDS)和X射線光電子能譜(X-ray photoelectron spectoscopy , XPS)進行表面分析。動態極化曲線分析顯示在含NaF的人工唾液中c.p. Ti、TNM和TNM-nt合金隨著NaF含量的增加，其腐蝕電位(Ecorr)隨著降低，其腐蝕電流密度(Icorr)隨著增加。交流阻抗分析顯示在人工唾液中極化阻抗(Rp)的大小順序為TNM-nt (112.58 kΩ/cm2) > TNM (23.11 kΩ/cm2) > c.p. Ti (15.15 kΩ/cm2)。含1 wt.% NaF的人工唾液中極化阻抗(Rp)的大小順序為 TNM-nt (97.42 kΩ/cm2) > TNM (9.43 kΩ/cm2) > c.p. Ti (3.75 kΩ/cm2)。以上結果顯示氟離子濃度增加會降低c.p. Ti、TNM合金和TNM-nt三者的耐蝕性，而TNM-nt具有最佳的耐蝕性以及抵抗氟離子侵蝕的能力。

關鍵字

鈦合金 ； 耐腐蝕 ； 人工唾液 ； 氟

並列摘要

Dental implants are highly susceptible to fluorine ions in the oral environment. In this study, the corrosion resistance of c.p. Ti, low-elastic Ti-5Nb-5Mo (TNM) and nanotube surface of TNM (TNM-nt) alloys in fluorine-containing artificial saliva with added different amounts of NaF was investigated. Open circuit potential (OCP), potentiodynamic polarization, and electrochemical impedance spectrum (EIS), were used to assess corrosion resistance. Furthermore, scanning electron microscope (SEM), energy dispersion X-ray spectrometer (EDS), and X-ray photoelectron energy spectrum (XPS) were used for surface analysis. Dynamic polarization curves showed that, for c.p. Ti, TNM and TNM-nt alloys, the corrosion potential (Ecorr) decreased and the corrosion potential (icorr) increased as the increase of NaF content in artificial saliva. AC impedance analysis showed that, the order of polarization resistance (Rp) in artificial saliva was TNM-nt (112.58 kΩ/cm2) > TNM (23.11 kΩ/cm2) > c.p. Ti (15.15 kΩ/cm2), and in artificial saliva with 1 wt.% NaF is TNM-nt (97.42 kΩ/cm2) and TNM (9.43 kΩ/cm2) and c.p. Ti (3.75kΩ/cm2). The above results show that the increase of fluoride ion concentration will reduce the corrosion resistance of c.p. Ti, TNM alloy and TNM-nt, while TNM-nt has the best corrosion resistance and the ability to resist fluoride ion erosion.

並列關鍵字

Titanium alloy ； Corrosion resistance ； Artificial saliva ； Fluoride

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