DENTAL CASTING OF TITANIUM ALLOYS

钛合金牙科铸件

• 批准号: 2701013
• 负责人: TORU OKABE
• 金额: $ 16.07万
• 依托单位: TEXAS A&M BAYLOR COLLEGE OF DENTISTRY
• 依托单位国家: 美国
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-05-01 至 2000-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/2701013
• 关键词: X ray crystallography; alloys; animal tissue; biomaterial compatibility; biomaterial development /preparation; biomaterial evaluation; biomechanics; corrosions; cytotoxicity; dental bonding material; dental casting material; elasticity; enzyme activity; fiber optic microscopy; fibroblasts; hardness; porcelain; scanning electron microscopy; succinate dehydrogenase; temperature; tensile strength; titanium

Dental casting by means of the lost-wax technique has been the dominant method of fabricating crowns and bridges for many years. However, since the end of the 1970's, efforts have been made to case fixed and removable dental prostheses using commercially pure (CP) titanium, which has mechanical properties similar to ADA Types I-IV gold alloys. The overwhelming advantage of titanium over other metals is its excellent biocompatibility, which is important because of increasing concerns about the toxicity of biomedical materials. In addition, titanium is an economical metal ($30/oz vs. $350/oz for a precious alloy) and is in abundant supply. Many of the initial problems with dental titanium casting arising from the inherent characteristics of titanium have now been solved. There are presently various kinds of commercial casting equipment and investment materials available which were specifically developed for dental titanium casting. However, further refinement of titanium casting technology remains to be done, particularly the casting alloys. The main goal of this proposal is to develop titanium alloys which have a low fusing temperature and high oxidation resistance which will result in casting performance, mechanical and corrosion properties , biocompatibility, and machinability equal or superior to CP titanium and ADA Type IV gold alloy. Specifically, the proposed project will attempt first to find suitable casting conditions for the NIOM/Baylor titanium casting equipment for CP titanium and Ti-6AI-4V. After the casting technology is refined with this equipment, binary candidate alloys will be screened based on mechanical properties and corrosion resistance. Experimental binary and ternary alloys (based on the screened binaries) will be evaluated in terms of casting performance, mechanical properties, corrosion behavior, microstructure, and biocompatibility. Advancements in the machinability of the selected experimental alloys will be attempted by alloying small amounts of elements noted for improving this property. Finally, the nature of porcelain bonding will be evaluated on selected experimental titanium alloys. The present research group believes the proposed study to be an important step for the advancement of this "technique-sensitive" process to a more practical level. There is great potential for titanium in dental casting applications and to ignore it would be a disservice to the public. In order for th e public to benefit, however, more work needs to be done on perfecting all aspects of the titanium casting technology. This is the work that this proposal addresses.

用失蜡技术铸造的牙齿一直占主导地位 制作牙冠和牙桥的方法。 但由于 在20世纪70年代末，人们已经努力使外壳固定和可移动 使用商业纯钛（CP）的牙科假体， 机械性能与ADA I-IV型金合金相似。 的 钛与其他金属相比的压倒性优势是其优异的 生物相容性，这是重要的，因为越来越多的关注， 生物医学材料的毒性。 此外，钛是一种 经济金属（30美元/盎司，贵合金350美元/盎司）， 供应充足。 牙科钛铸造的许多初始问题 由钛的固有特性引起的问题现已得到解决。 目前有各种商业铸造设备， 专门为牙科开发的投资材料 钛铸件 然而，进一步细化钛铸造 技术仍有待完成，特别是铸造合金。 主要 该提案的目标是开发具有低熔融性的钛合金， 温度和高抗氧化性，这将导致铸造 性能、机械和腐蚀性能、生物相容性，以及 机械加工性等于或上级于CP钛和ADA IV型金合金。 具体而言，拟议项目将首先尝试找到合适的 NIOM/Baylor CP钛铸造设备的铸造条件 钛和Ti-6Al-4V。 铸造工艺用此精炼后， 设备，二元候选合金将筛选的基础上，机械 性能和耐腐蚀性。 实验二元和三元 合金（基于筛选的二进制文件）将根据以下方面进行评估： 铸造性能，机械性能，腐蚀行为， 微结构和生物相容性。 机械加工性能的进步 所选择的实验合金将尝试通过合金化小的 注意到用于改善该性能的元素的量。 最后，自然 将在选定的实验钛上评价瓷结合的 合金. 目前的研究小组认为，拟议的研究是一个 这是推进这一“技术敏感”进程的重要一步， 更实际的水平。 钛在牙科领域有着巨大的应用潜力 对申请进行筛选和忽视将是对公众的伤害。 然而，为了使公众受益，还需要做更多的工作， 完善钛铸造技术的各个方面。 这是 这项提案所涉及的工作。