高转移人涎腺黏液表皮样癌耐药细胞系的建立及其生物学特性

目的:建立人涎腺黏液表皮样癌细胞系耐药细胞株并观察其生物学特性及耐药性能.方法:采用裸鼠体内成瘤加药诱导然后在体外用恒定浓度间歇法持续加药,建立高转移人涎腺黏液表皮样癌细胞系MC3的耐药细胞系,应用MTT法,细胞计数法,免疫组化,电镜,RT-PCR等方法观察及检测细胞的生物学特性及耐药性.结果:MC3细胞经过5-FU在体内、体外反复作用产生了多药耐药性,耐药细胞系命名为MC3/5-FU.MC3和MC3/5-FU细胞均为单层贴壁生长,局部可见重叠生长,增殖活跃,2种细胞形态及超微结构未见明显差别.MC3/5-FU,MC3细胞的群体倍增时间分别为55 h和60 h.MC3/5-FU细胞对于5-氟尿嘧啶(5-FU)、博莱霉素(BLM)、长春新碱(VCR)、长春花碱(VBL)、顺铂(CDDP)的耐药倍数分别为13.3、4.2、6.5、6.9、0.7.免疫组化结果显示:P-gp(P蛋白)在MC3/5-FU呈阳性表达,而在MC3则未见表达.PCR结果显示MDR-1基因在MC3/5-FU中表达高于MC3.结论:MC3/5-FU具有多药耐药性.     

5-FU聚乳酸纳米微球对人舌癌Tca83细胞增殖及凋亡的影响

目的:探讨5-FU聚乳酸纳米微球抑制人舌癌Tca83细胞增殖及诱导其凋亡的作用。方法:5-FU聚乳酸纳米微球、5-FU及空白对照组分别作用于Tca83细胞,四唑盐(MTT)比色法检测细胞存活率;吖啶橙(AO)荧光染色法检测细胞凋亡情况,并计算凋亡指数(AI);流式细胞仪(FCM)检测细胞周期的变化。结果:5-FU与5-FU聚乳酸纳米微球组自第3天起与对照组之间存在显著性差异(P<0.05),且差异随作用时间的延长、作用浓度的增加而增大,其中5-FU组持续到第7天其后差异的变化不再具有统计学意义;而5-FU聚乳酸纳米微球组则一直持续到第11天且差异的增加始终具有统计学意义,同时自第7天起与同条件下5-FU各浓度组比较差异亦有显著性(P<0.01)。结论:5-FU聚乳酸纳米微球可抑制Tca83细胞增殖并诱导其凋亡,其作用呈剂量和时间依赖性,且作用时间较5-FU延长、作用效果较5-FU提高。     

莱菔硫烷与5-氟尿嘧啶对人涎腺腺样囊性癌细胞生长的协同作用研究

目的:研究莱菔硫烷(SFN)与5-氟尿嘧啶(5-FU)对人涎腺腺样囊性癌细胞(ACC-2)生长的抑制作用,并初步探讨其与细胞核核因子κB p65(NF-κB p65)表达的关系.方法:应用中位效应原理和联合作用指数法来评价药物的联合作用;应用Western 印迹法分析NF-κB p65的表达.结果:SFN和5-FU半数生长抑制率(IC50)分别为56.73 ±6.59 μmol/L和89.88±7.56 μmol/L,联合使用时对ACC-2细胞生长具有协同抑制作用,同时可观察到细胞核NF-κB p65表达显著下降.结论:SFN可以增强5-FU的化学治疗效果,二者联合使用的协同抑癌作用对于涎腺腺样囊性癌的临床治疗可能具有实际意义.     

口腔癌患者口服脱氧5-氟尿苷后向肿瘤组织移行的临床研究

脱氧5-氟尿苷(5′-DFUR)是1979年由Cook等人合成的5-FU诱导剂,磷酸嘧啶核苷在肿瘤组织内具有高活性,能使5′-DFUR转化成5-FU。5′-DFUR对胃癌、直肠癌、乳腺癌有效,用于头颈部恶性肿瘤较少。本文作者以7例口腔癌患者为对象,其中原发癌4例、局部复发及复发转移癌3例,术前1周口服5′-DFUR400mg,然后行化疗,以CDDP和PEP方案为主,放疗4例,再行手术切除肿瘤,测定切除肿瘤组织及相连接正常组织5-FU浓度,部分患者测定血中5-FU浓度,研究了5′-DFUR的安全性及有效性。     

二种途径灌注5-FU犬头颈部药物浓度的变化比较

目的:比较不同方法灌注5-FU后,犬舌及颌下淋巴结组织内的药物浓度。方法 :16只健康家犬称重后随机分为A组(舌动脉给药)和B组(股静脉给药)。分别行经舌动脉及股静脉持续24 h灌注5-FU。在12、24 h采集2组灌注侧舌体组织及下颌下淋巴结。反相高效液相色谱法(RP-HPLC)检测以上采集组织标本中5-FU含量。结果:全麻状态下,犬能耐受24 h舌动脉持续灌注5-FU并保持生命体征平稳。舌动脉灌注组舌体组织及颌下淋巴结内5-FU浓度,明显高于股静脉给药组。结论:5-FU舌动脉持续灌注后,舌及下颌下淋巴结的药物浓度均明显高于股静脉持续灌注。     

变形链球菌UA159Pfs蛋白原核表达纯化及对自诱导分子2合成的影响

目的 合成有活性的变形链球菌自诱导分子2(autoinducer-2,AI-2),探讨AI-2在牙面生物膜形成中的作用,以期为后续研究奠定基础.方法 构建表达载体pET21a(+)-pfs;诱导表达S-腺苷高半胱氨酸核苷酶(S-adenosylhomocysteine nucleosidase,Pfs)蛋白,蛋白质印迹法鉴定；镍柱纯化；Pfs与S-核糖基高半胱氨酸酶(S-ribosylhomocysteinase,LuxS)催化S-腺苷L高半胱氨酸[S-(5’-adenosyl)-L-homocysteine,SAH]合成AI-2,以哈氏弧菌BB170检测其生物活性,并观察Pfs蛋白浓度对AI-2合成的影响.结果 成功构建了表达载体pET21a(+)-pfs;1 mmol/L异丙基硫代-β-D-半乳糖苷诱导目的蛋白表达4h蛋白表达量最高,纯化得蛋白质量浓度为0.8 g/L;蛋白质印迹法证实表达产物为Pfs融合蛋白.合成了有生物活性的AI-2,其诱导哈氏弧菌BB170发光的强度在5h时最强[(815 522 ±73 912) cd].Pfs质量浓度与AI-2相对活性呈浓度依赖关系(P＜0.05),且随着Pfs蛋白质量浓度的升高(0 ～0.38 g/L) AI-2的相对活性逐渐增大(0 ～ 29.14 ±1.35),二者呈正相关(r =0.819,P=0.000).结论 Pfs融合蛋白具备相应的生物功能,可在体外合成有活性的AI-2;线性相关分析表明Pfs蛋白浓度与合成的AI-2相对活性呈正相关.     

人黏液表皮样癌裸鼠耐药移植瘤模型的建立及其生物学特性

目的:建立一种耐药性稳定的人涎腺黏液表皮样癌裸鼠移植瘤模型.方法:将人涎腺黏液表皮样癌多药耐药细胞接种于裸鼠皮下,成瘤后经腹腔注射小剂量5-FU进行体内诱导,建立稳定的黏液表皮样癌裸鼠移植瘤模型.结果:裸鼠移植瘤原代培养的MEC/5-FU/NU细胞与体外培养细胞结构类似,MEC/5-FU/NU细胞对5-FU的耐药指数为27.82.RT-PCR显示耐药相关基因ABCB1、ABCB11、GSTA1在MEC/5-FU/NU细胞中明显高表达(P<0.05).免疫荧光显示多药耐药蛋白MDR-1在MEC/5-FU/NU细胞中高表达.结论:以MEC/5-FU建立的黏液表皮样癌裸鼠皮下移植瘤模型仍保持MEC/5-FU细胞的形态学特征和多药耐药性,可为耐药性人涎腺黏液表皮样癌耐药机制和逆转的研究提供较理想的动物模型.     

耐药和非耐药口腔鳞癌Tca8113代谢组学方法鉴定的初步研究

目的:初步将基于氢谱核磁共振(1H-NMR)的代谢组学方法应用于口腔耐药和非耐药口腔鳞癌Tca8113的鉴定。方法:MTT法绘制细胞生长曲线并检测药物敏感性,免疫组织化学检测与多药耐药现象相关蛋白P-gp的表达情况;收集胞外代谢产物进行核磁共振检测,用主成分分析法进行数据分析。结果:主成分分析法显示耐药细胞和非耐药细胞数据内部有集中的聚类关系,基于氢谱核磁共振的代谢组学方法可以区分耐药和非耐药的Tca8113。结论:代谢组学方法在产生耐药性的口腔癌细胞的快速鉴定中具有良好的应用前景,有望成为一种新的检测手段。     

人涎腺黏液表皮样癌多药耐药细胞系的建立及其生物学特性

目的：建立一种耐药性稳定的人涎腺黏液表皮样癌细胞株（MEC/5-FU）,为研究其耐药机制和逆转药物的筛选奠定实验基础。方法：采用浓度递增法联合大剂量冲击诱导方法,建立稳定的MEC/5-FU。应用MTT法、RT-PCR、罗丹明123蓄积试验等方法检测该细胞株的耐药性能及其生物学特性。结果：MEC/5-FU耐药性能稳定,对5-FU的耐药倍数达到36.11,并且对其他几种化疗药物表现不同程度的交叉耐药性。RT-PCR显示耐药相关基因ABCA2、ABCB1、ABCB11、ABCC1、ABCC4等ABC家族基因在MEC/5-FU细胞中明显高表达。罗丹明123在MEC/5-FU细胞中的蓄积量远低于MEC细胞。结论：MEC/5-FU具有多药耐药特性,为人涎腺黏液表皮样癌耐药机制和耐药逆转研究提供了理想的实验模型。     

应用代谢组学法分析3种常用口腔材料对细胞内小分子蛋白的影响

目的采用一氢核磁共振(1H-NMR)的代谢组学方法,分析3种常用口腔材料对细胞的胞内小分子蛋白质谱的影响,探讨代谢组学方法在评价材料生物相容性方面的潜在应用前景。方法将小鼠成纤维细胞分别与羟基磷灰石-磷酸三钙生物陶瓷、钛合金、聚甲基丙烯酸甲酯(自凝塑料)3种常用口腔材料进行体外培养,并设单独细胞培养作为空白对照。培养72 h后提取细胞内蛋白质,利用核磁共振技术检测细胞内蛋白变化谱,经数据处理和和偏最小二乘法判别分析(PLS-DA),比较各组间小分子蛋白质谱的变化情况,观察各组间小分子蛋白质谱的差异。结果3组材料引起的细胞内小分子蛋白质谱明显不同,均有各自聚集趋势,分布区域间有较大的分隔区,且区分明显。结论代谢组学分析细胞内小分子蛋白质谱可能是一种在分子水平上研究口腔材料生物相容性机制以及评价的有效方法。     

Preparation and evaluation of novel bio-based Bis-GMA-free dental composites with low estrogenic activity

ObjectiveAlthough bisphenol Aglycidyl methacrylate (Bis-GMA) are widely used in the dental composite, its raw materials include the petroleum-based product bisphenol A (BPA) with high estrogenic activity (EA). In this study, two new BPA-free dimethacrylate monomers from bio-based material creosol were synthesized and evaluated.MethodsThe renewable bisphenol monomer 5, 5'-methylenedicreosol (BCF) was prepared from bio-based material creosol. By the human breast cancer cells (MCF-7 cells) proliferation assay, a risk assessment of BCF was performed to determine if BCF possessed reduced EA in comparison to BPA. Then, the novel monomers 5, 5'-methylenedicreosol diglycidyl ether diacrylate (BCF-EA) and 5, 5'-methylenedicreosol diglycidyl ether dimethacrylate (BCF-GMA) were synthesized from BCF with epichlorohydrin and (meth)acrylate. All products were investigated by ¹H NMR and FT-IR spectra. The control resin was a mixture based on Bis-GMA and tri(ethyleneglycol) dimethacrylate (TEGDMA) with a weight ratio of 5:5 (5B5T). Similarly, experimental resin matrix was a mixture based on BCF-EA/TEGDMA (5E5T) and BCF-GMA/TEGDMA (5G5T). And their corresponding composites were then prepared with corresponding resin matrices and hybrid SiO₂ (5E5TC, 5G5TC and 5B5TC). The properties of these composites were investigated according to the standard or referenced methods. Each sample was evaluated for double bond conversion (DC), shrinkage stress (SS) and volumetric polymerization shrinkage (VS). Water sorption (WS), water solubility (SL), mechanical properties and cytotoxicity were also measured.Results¹H NMR and FT-IR spectra confirmed the chemical structure of each monomer. EA test revealed that bio-based bisphenol monomer BCF as the precursor of BCF-EA and BCF-GMA showed lower EA than BPA. Cured resin matrix: Both 5E5T and 5G5T had nearly the same DC (p < 0.05), which was higher than 5B5T (p < 0.05); 5E5T and 5G5T had lower VS, SL and cytotoxicity than 5B5T (p < 0.05); mechanical properties of 5E5T and 5G5T were all better than those of 5B5T (p < 0.05). Cured composite: There was no significant difference in conversion (p < 0.05); 5E5TC and 5G5TC had significantly lower VS (p < 0.05); WS of 5E5TC and 5G5TC were similar (p < 0.05), but higher compared to 5B5TC (p < 0.05); 5E5TC and 5G5TC had the deeper depth of cure (p > 0.05); before water immersion, there was no significant difference in flexural strength between 5E5TC and 5G5TC (p > 0.05), and higher than 5B5TC (p < 0.05); 5E5TC and 5G5TC showed less cytotoxicity than 5B5TC (p < 0.05).SignificanceThe new BPA-free di(meth)acrylates are promising photocurable dental monomers owning to bio-based raw material, high degree of conversion coupled with low curing shrinkage and good mechanical properties. Therefore, BCF-EA and BCF-GMA has a potential to be used as the substitution for Bis-GMA to prepare Bis-GMA-free dental composite.     

Correlation of preference- and profile-based quality of life of Japanese oral cancer patients during the perioperative period measured using EQ-5D-5L and FACT-H&N

The EuroQol 5-dimension 5-level (EQ-5D-5L) instrument is among the most used preference-based quality of life (QOL) measures for cost–utility analysis. Each dimension is evaluated on five levels. The aim of this study was to clarify whether the EQ-5D-5L, which consists of only five items, correlates with profile-based QOL measures in Japanese oral cancer patients during the perioperative period. One hundred participants with oral cancer undergoing radical therapy completed QOL assessments before treatment, at treatment completion, and 1 and 3 months after treatment using the EQ-5D-5L and Functional Assessment of Cancer Therapy – Head & Neck instrument (FACT-H&N, Japanese version). To clarify how the EQ-5D-5L reflects the FACT-H&N, multiple regression analyses were performed using FACT-H&N subscales. The ceiling effect of the EQ-5D-5L was investigated. The EQ-5D-5L moderately correlated with the FACT-H&N over the entire perioperative period (r_s = 0.586, P < 0.01). In the multiple regression analysis, the EQ-5D-5L was strongly reflected in the physical wellbeing subscale of the FACT-H&N, excluding social wellbeing. The pre-treatment EQ-5D-5L score was decreased owing to the impacts of the dimensions of pain/discomfort and anxiety/depression. The EQ-5D-5L did not have a ceiling effect in oral cancer patients. The EQ-5D-5L appears to generally correlate with the FACT-H&N for oral cancer patients during the perioperative period.     

口腔扁平苔藓与丙型肝炎病毒感染关系的探讨

目的 :研究丙型肝炎病毒感染与口腔扁平苔藓发病之间的关系。方法 :采用ELISA法检测 31例OLP患者和 71例正常对照组血清中HCV-Ab阳性率。结果 :31例OLP患者中 5例HOV-Ab阳性 (阳性率16.13% ) ,正常组阳性率为零 (p <0.01) ,并且糜烂型OLP患者HCV-Ab阳性率高于非糜烂型患者。结论 :HCV感染与OLP存在相关性。     

瓷层厚度影响金瓷界面抗断裂能力的初步研究

目的：采用云纹干涉法结合界面断裂力学研究瓷厚度对金瓷界面抗断裂能力的影响。方法：比较瓷厚度分别为0．5mm,1.5mm,2.5mm的试件（金属均为0．5mm)界面断裂韧性Jc并观测裂纹扩展。结果：0．5mm组试件的Jc值及承受最大载荷均值（2．813N/m,9.979N)低于1．5mm及2．5mm组（5．395N／m,19.134N与5．429N/m,19.256N).1.5mm与0．5mm组试件，裂纹易沿界面扩展。结论：（1）瓷厚度为1．5mm与2．5mm组的金瓷界面抗断裂能力相当，厚度为0．5mm时减弱，（2）瓷厚度为1．5mm与0．5mm组的界面裂纹易沿界面扩展，厚度为2．5mm组易向瓷层内扩展。     

Pharmacological properties of serotonin receptor subtypes mediating contraction of bovine inferior alveolar arteries

OBJECTIVE: To characterise the 5-hydroxytryptamine (5-HT) receptor subtypes mediating contraction of the inferior alveolar artery. Additionally, to determine the role of cyclooxygenase products, nitric oxide, endothelium, monoamine oxidase and 5-HT uptake in modulating contraction of inferior alveolar arteries to 5-HT. METHODS: Contractile responses to 5-HT were examined in vitro using ring segments of bovine inferior alveolar arteries. Affinity constants (K(B)'s) of subtype-selective 5-HT receptor antagonists were determined to characterise the 5-HT receptor-subtypes causing contraction of inferior alveolar arteries. RESULTS: In 100 nM ketanserin or 30 nM spiperone, 5-HT caused a biphasic contraction best-fit by a two-site curve model, where one site was antagonist-sensitive and the other site antagonist-insensitive. 5-HT(2A) receptor-subtype selective antagonists, ketanserin and spiperone, blocked 5-HT induced contraction with K(B)'s of 1.0 and 0.16 nM, respectively. RS102221 (5-HT(2C) selective) and (S)-WAY100135 (5-HT(1A) selective) blocked 5-HT stimulated contraction with low affinities (K(B)'s=100 nM and 330 nM, respectively). GR55562, a 5-HT(1) receptor subtype antagonist with a reported affinity of 500 nM at the 5-HT(1D) receptor subtype, blocked 5-HT induced contraction with a K(B) of 470 nM. Cylooxygenase inhibition with 50 microM ibuprofen caused a 44% increase in maximal contraction to 5-HT; whereas, nitric oxide inhibition with N(G)-nitro-L-arginine, endothelium removal or inhibition of 5-HT uptake and monoamine oxidase with imipramine and iproniazid, respectively, did not affect 5-HT contraction. CONCLUSIONS: Both 5-HT(2A) and 5-HT(1D/1B) receptor subtypes mediate 5-HT induced contraction of the bovine inferior alveolar artery. 5-HT stimulated contraction of the inferior alveolar artery is modulated by a vasodilator prostaglandin.     

CCL5/CCR5生物轴在涎腺腺样囊性癌细胞嗜神经侵袭中的作用

目的 探讨CCL5/CCR5生物轴在涎腺腺样囊性癌（SACC）细胞嗜神经侵袭中的作用。方法 应用细胞免疫荧光技术和流式细胞术检测SACC-LM细胞中趋化因子受体CCR5的表达;应用酶联免疫吸附测定（ELISA）法检测周围神经细胞培养上清液中趋化因子CCL5的表达。应用流式细胞术检测CCL5对SACC-LM细胞内F肌动蛋白的作用,并通过划痕和侵袭实验观察趋化因子CCL5和其受体CCR5对SACC-LM细胞运动能力和侵袭能力的作用。结果 SACC-LM细胞高表达趋化因子受体CCR5;周围神经原代培养上清液中趋化因子CCL5质量浓度为（359.2±15.8）、（696.4±22.6） pg·mL^-1;趋化因子CCL5和其受体CCR5结合后对SACC-LM细胞的运动能力和侵袭能力可以产生促进作用。结论 CCL5/CCR5生物轴可能在SACC细胞嗜神经侵袭中起着重要的作用。     

Bone augmentation using rhGDF-5-collagen composite

The aim of this study was to evaluate the effectiveness of local application of growth differentiation factor-5 (GDF-5)-collagen composite on bone augmentation on the rat calvaria. GDF-5-collagen composite is made from recombinant human GDF-5 (rhGDF-5) and purified bovine type I atelocollagen. The GDF-5 solution was mixed with 0.3% atelocollagen acid solution, and the mixture was lyophilized. The spongy lyophilized material was pressed into the shape of a minidisk to make the GDF-5-collagen composite. The GDF-5-collagen composite contained 1, 10, or 100-microg rhGDF-5. The control collagen composite contained 0-microg rhGDF-5. The GDF-5-collagen composite or control collagen composite was inserted beneath the calvarial periosteum of 4-week-old rats. At 3 weeks after implantation, the implants containing 1-microg rhGDF-5 had mostly induced new bone formation on the cranial side. In the implants containing 10- microg rhGDF-5, bone formation had proceeded to the center of the GDF-5-collagen composite from the periosteal and the cranial sides, and bone marrow was seen focally. The augmented bone showed a connected trabecular structure with abundant vascularization. The implants containing 100-microg rhGDF-5 were nearly entirely replaced by new bone with bone marrow, and the augmented bone was firmly connected with the original bone. Neither cartilage nor bone formation was found in the control collagen composite. Thus, we conclude that the GDF-5-collagen composite may be a superior biomaterial for bone augmentation and this composite could be useful as a local osteoinductive device.     

DLX5对牙源性间充质干细胞迁移及趋化作用的研究

目的 探究distal-less homeobox 5 (DLX5)对牙源性间充质干细胞(dental tissue-derived mesenchymal stem cells, DT-MSCs)迁移及趋化的作用。方法 利用逆转录病毒对根尖牙乳头干细胞(stem cells from apical papilla, SCAPs)进行转染,构建稳定过表达及敲减DLX5的细胞系。通过体外细胞划痕实验、transwell实验,探究DLX5对SCAPs迁移及趋化的影响。进一步观察DLX5过表达的SCAPs的条件培养基对牙周膜干细胞 (periodontal ligament stem cells, PDLSCs)迁移及趋化的影响。结果 ①逆转录病毒转染DLX5过表达的质粒后,DLX5在SCAPs中有效过表达;逆转录病毒转染DLX5敲减的质粒后,有效抑制了DLX5在SCAPs中的表达,与对照组相比,差异具有显著性。②过表达DLX5能明显促进SCAPs的迁移及趋化能力。③敲减DLX5能明显抑制SCAPs的迁移及趋化能力。④过表达DLX5的SCAPs的条件培养基促进了PDLSCs的迁移及趋化能力。结论 DLX5对SCAPs的迁移及趋化具有正向调控作用,过表达DLX5的SCAPs条件培养基可以促进PDLSCs的迁移及趋化能力。     

Activation of the bulbospinal serotonergic system during experimental tooth movement in the rat

Experimental tooth movement is known to induce characteristic delayed and continuous nociception. Nociceptive somatic stimuli activate endogenous pain control systems such as descending monoaminergic pathways, which modulate the transmission of ascending sensory messages. To test the hypothesis that bulbospinal serotonergic pathways modulate subchronic nociception, we assayed the medulla at the level of the subnucleus caudalis and peri-aqueductal grey by high-performance liquid chromatography with electrochemical detection for the serotonin (5-hydroxytryptamine, 5-HT) and its metabolite (5-hydroxyindoleacetic acid, 5-HIAA) 24 hrs after the onset of experimental tooth movement. Experimental tooth movement significantly increased 5-HT and 5-HIAA levels, and 5-HIAA/5-HT, an index of serotonin turnover, in the medulla, and 5-HIAA level and 5-HIAA/5-HT in the peri-aqueductal grey, indicating that nociception induced by experimental tooth movement activates the bulbospinal serotonergic pathway.     

新型钛锆铌锡合金的耐蚀性研究

目的 评价新型钛锆铌锡合金在人工唾液中的耐蚀性,为钛锆铌锡合金的临床应用提供依据.方法 观察钛锆铌锡合金(Ti-12.5Zr-3Nb-2.5Sn)和对照纯钛(TA2)及钛铝钒合金(Ti-fAl-4V)在人工唾液中的电化学行为,比较极化曲线及极化阻力;检测钛锆铌锡合金和钛铝钒合金在人工唾液中1、2、3、5、7、15 d的离子释出情况.结果 极化曲线显示,钛铝钒合金的击穿电位(0.8 V)低于钛锆铌锡合金(＞2.5 V);钛锆铌锡合金、纯钛在钝化区的维钝电流密度(icorr)基本保持稳定,分别为3.32×10-6～3.46×10-5A/cm2和5.03×10-6～2.65×10-5A/cm2,低于钛铝钒合金(1.45×10-4～1.09×10-3 A/cm2).纯钛、钛锆铌锡合金、钛铝钒合金的极化阻力分别为371.0、252.0、60.1 kΩ·cm2.离子释出结果显示,随浸泡时间增加,两种钛合金的离子溶出量均有不同程度增加,且各时间点钛铝钒合金的离子溶出量均高于钛锆铌锡合金.结论 钛锆铌锡合金在人工唾液中具有良好的耐蚀性,可用于制作口腔修复体.