Ti-35Nb-7Zr-5Ta的表面性能：在人工唾液和氟溶液中长期浸泡的影响

Surface properties of Ti-35Nb-7Zr-5Ta: Effects of long-term immersion in artificial saliva and fluoride solution.

作者信息

Miotto Larissa N, Fais Laiza M G, Ribeiro Ana L R, Vaz Luís G

机构信息

Postgraduate student, Department of Dental Materials and Prosthodontics, Araraquara Dental School, São Paulo State University, Araraquara, Sao Paulo, Brazil.

Professor, Department of Dental Materials and Prosthodontics, Araraquara Dental School, São Paulo State University, Araraquara, Sao Paulo, Brazil.

出版信息

J Prosthet Dent. 2016 Jul;116(1):102-11. doi: 10.1016/j.prosdent.2015.10.024. Epub 2016 Jan 29.

DOI:10.1016/j.prosdent.2015.10.024

PMID:26831918

Abstract

STATEMENT OF PROBLEM

The mechanical properties of new titanium alloys with an elastic modulus closest to cortical bone have been studied. However, potentially damaging conditions experienced in the oral cavity, such as fluoride ions, can initiate a localized or crevice process of corrosive degradation in the alloy surfaces.

PURPOSE

The purpose of this in vitro study was to evaluate the effects of long-term immersion in artificial saliva or in fluoride solution on mean roughness (Ra), Vickers hardness, and topography of the new titanium alloy Ti-35Nb-7Zr-5Ta (TNZT) compared with those of cp Ti and Ti-6Al-4V (TAV).

MATERIAL AND METHODS

Disks (N=210) were divided into cp Ti, TAV, and TNZT and subdivided according to the following treatments: no immersion (N(-), control), immersion in artificial saliva (S), and immersion in fluoride (F) during periods equivalent to 5, 10, 15, and 20 years. The Ra and Vickers hardness were measured with a profilometer and a hardness tester. The topography was analyzed by scanning electronic microscopy. Data were compared using the Kruskal-Wallis and Dunn tests (α=.05).

RESULTS

Values of Ra and hardness were significantly different among the metals (Ra: TAV<TNZT<cp Ti; P<.05); and hardness (cp Ti<TNZT<TAV; P<.05); with a tendency for Ra to increase for TAV after 20 years of fluoride immersion and changes in hardness values of TAV and TNZT after immersion. TAV surfaces showed a heterogeneous appearance.

CONCLUSIONS

Long-term immersion in NaF did not change the roughness of Ti-35Nb-7Zr-5Ta. However, the hardness of the alloys increased with immersion.

摘要

问题陈述

人们已经对弹性模量最接近皮质骨的新型钛合金的力学性能进行了研究。然而，口腔中可能遇到的潜在损伤条件，如氟离子，会引发合金表面局部或缝隙腐蚀降解过程。

目的

本体外研究的目的是评估新钛合金Ti-35Nb-7Zr-5Ta（TNZT）与纯钛及Ti-6Al-4V（TAV）相比，长期浸泡在人工唾液或氟溶液中对平均粗糙度（Ra）、维氏硬度和表面形貌的影响。

材料与方法

将圆盘（N = 210）分为纯钛、TAV和TNZT三组，并根据以下处理进一步细分：不浸泡（N(-)，对照）、浸泡在人工唾液（S）中以及浸泡在氟溶液（F）中，浸泡时间分别相当于5、10、15和20年。使用轮廓仪和硬度测试仪测量Ra和维氏硬度。通过扫描电子显微镜分析表面形貌。使用Kruskal-Wallis和Dunn检验（α = 0.05）比较数据。