Studies on Improvement of Properties and Clinical Qpplication of Pure Titanium Restoration

纯钛修复体性能改进及临床应用研究

• 批准号: 61870081
• 负责人: KAWAZOE Takayoshi
• 金额: $ 6.08万
• 依托单位: OSAKA DENTAL UNIVERSUTY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61870081/
• 关键词: Titanium Casting; Casting Defects; Dimensional Fitness; Zirconium Metal powder; Oxidation Expansion; Internal Porosities; Castability

1) Internal porositiesThe amount of prosity of titanium casting was estimated from the densi determination of any specimen,and radiographic examinations were employed to observe the internal porosities of the casting.The amount of porosity was independent on the mold temperature and the magnitude of the casting pressure. Hoeever,it was markedly influenced by the permeability of the mold materials and the suction during the application of castig pressure. It was showed that the amount the porosity decreased with decreasing the permeability of the mold materials. In the case of the high permeability mold materials,the casting pressure with suction developed the internal porosities much more than without suction.2) GastabilityThe castability values of pure titanium was lower at room temperature than at 8000゜C. Increasing the casting pressre caused an increase in the castability value and the suction was effective on the gain. The value decreased as the permeability of the mold materials w … More as lowered.These result suggest that the casting procedure for preventing the porosities of titanium castings is unsuitable for increasing the castability. Therefore,it is most effective to apply the large castung perssure without suction. Employing a diaphram between the melting chamber and the casting chamber of the vacuum!argon pressure casting machine was very effective on the gain of the castability.3) Improvement of fitness on castingsThe practical improvement of dimensional fitness between titanium castin and abutment was achieved by the oxidizing expansion of Zr metal powder mixed in a magnesia invesment during firing up to 800゜C. This magnesia investment was used as a face-coating investment and the dental phosphate-bonded investment was used as a outer investment for the titanium casting crown.4) Glinical application of pure titanium restorationSince 1982,more than one hundred restorations of pure titanium have bee used chinically. There were no problem in the adhesion of plaque, discoloration and occlusal wear to the titanium restorations.There were useful for prosthodontic evaluation in retentive condition on resin veneered titanium cast crown,and bending strength and corrosion on titanium post core. Less

1)内部气孔通过测定任何试样的密度来估计钛铸件的气孔量，并通过射线照相检查来观察铸件的内部气孔，气孔量与模具温度和铸造压力的大小无关。但铸型材料的透气性和施加压力时的负压对铸坯的透气性有显著影响。结果表明，随着铸型材料透气性的降低，气孔率降低。在高渗透性模具材料的情况下，有抽吸的铸造压力比没有抽吸的铸造压力产生更多的内部孔隙。2）可铸性纯钛的可铸性值在室温下比在8000 ℃下低。提高铸造压力可提高铸坯的可铸性，而抽气对增益有明显的影响。随着模具材料渗透率的增加， ...更多信息 这些结果表明，防止钛铸件气孔的铸造工艺不适合于提高铸造性能。因此，最有效的方法是在不抽气的情况下施加较大的抛掷压力。在真空的熔化室和铸造室之间采用隔膜！氩气压力铸造机对提高铸件的可铸性是非常有效的。3）改善铸件的适合性通过在高达800 ℃的烧成过程中将Zr金属粉末混合在氧化镁包埋物中进行氧化膨胀，实现了钛铸件与基台之间的尺寸适合性的实际改善。4）纯钛铸造的临床应用自1982年以来，已有上百种纯钛铸造材料在临床上应用。结果表明：钛桩核的抗弯强度、抗蚀性和树脂贴面钛铸造冠的固位情况对口腔修复有一定的参考价值。少

项目成果

都賀谷 紀宏: 歯科材料・器械. 6. 90-91 (1987)

Norihiro Tsugaya：牙科材料和仪器 6. 90-91 (1987)。

K.IDA: "Properties and Use of Titanium" DE. 82. 34-39 (1987)

K.IDA：“钛的特性和用途”DE。

M.NAKAMURA,T.TOGAYA and K.IDA: Advances in Ceramics. 24. (1988)

M.NAKAMURA、T.TOGAYA 和 K.IDA：陶瓷的进展。

川添尭彬,末瀬一彦: "「チタンの歯科利用 第V章I節 チタンのクラウン・ブリッジヘの応用」" クィンテッセンス出版, (1988)

Takaaki Kawazoe、Kazuhiko Suese：“钛的牙科用途第五章第一节钛在牙冠和牙桥上的应用”Quintessence Publishing，（1988 年）

Y.KAWAZOE: "Current and Future Pure-Titanium Crown Restoration" J.Dent Technology. 14. 1252-1254 (1986)

Y.KAWAZOE：“当前和未来的纯钛牙冠修复”J.Dent Technology。