Application of titanium alloys to porcelain fused to metal crown

钛合金在金属烤瓷冠中的应用

• 批准号: 13470409
• 负责人: YODA Masanobu
• 金额: $ 2.75万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13470409/
• 关键词: titanium alloy; porcelain fused to metal crown; bond strength to porcelain; thermal expansion; shrinkage

Titanium is an attractive dental restorative material because of its excellent characteristics, however it is difficult to cast. Beta-stabilized titanium alloys have lower fusion temperatures than pure titanium. For dental clinical use, these alloys must be able to bond to dental porcelains because of the esthetic demands of dentistry. Eighteen binary titanium alloys were examined : Ti-Cr (15, 20, 25 wt%), Ti-Pd (15, 20, 25 wt%), Ti-Ag (10, 15, 20 wt%), Ti-Cu (5, 10 wt%), Ti-Fe (5, 10, 15 wt%) and Ti-Mn (5, 10, 15, 20 wt%). As controls, pure titanium and a gold alloy were also examined. Bond strengths were evaluated according to ISO 9693. The elastic modulus was also measured for each. The titanium alloy composition had a significant effect on alloy elastic modulus, but it had little effect on the bond strength to porcelain. The bond strengths for all the experimental alloys were similar to those of the two control alloys (Pure titanium and gold alloy) and were higher than 25 MPa, the minimum value specified in ISO 9693. These findings indicate that the experimental alloys exhibited sufficient shear bond strength for use in metal-ceramic restorations.In this study, some specimens (Ti-15wt%Pd and Ti-20wt%Pd) deflected upon cooling, even after the bond test. The thermal expansion value of these alloys was not much different from that of the other alloys. The next study investigated the cause of this deflection by analyzing the thermal expansion/shrinkage curve.Because the beta to alpha phase transformation and the stress developed from the shrinkage of the porcelain simultaneously occurred, these alloys were permanently deformed (I.e., they underwent creep), resulting in the deflected specimens.

钛因其优良的性能而成为一种极具吸引力的牙科修复材料，但其铸造困难。β稳定钛合金的熔化温度比纯钛低。对于牙科临床应用，由于牙科的美学要求，这些合金必须能够与牙科陶瓷结合。研究了18种二元钛合金：Ti-Cr（15，20，25重量%），Ti-Pd（15，20，25重量%），Ti-Ag（10，15，20重量%），Ti-Cu（5，10重量%），Ti-Fe（5，10，15重量%）和Ti-Mn（5，10，15，20重量%）。作为对照，还检查了纯钛和金合金。根据ISO 9693评价粘合强度。还测量了每种材料的弹性模量。钛合金成分对合金弹性模量有显著影响，但对钛合金与瓷的结合强度影响不大。所有实验合金的结合强度与两种对照合金（纯钛和金合金）的结合强度相似，并且高于25 MPa，即ISO 9693中规定的最小值。在本研究中，一些试样（Ti-15wt%Pd和Ti-20wt%Pd）在冷却时发生弯曲，甚至在粘结试验后也发生弯曲。这些合金的热膨胀值与其他合金的热膨胀值没有太大的不同。接下来的研究通过分析热膨胀/收缩曲线来调查这种偏转的原因。因为β到α相变和瓷收缩产生的应力同时发生，这些合金永久变形（即，它们经历蠕变），导致试样发生偏转。

项目成果

Masanobu Yoda, Tatsuhiko Konno, Yukyo Takada, Kazunori Iijima, Jason Griggs, Osamu Okuno, Kohei Kimura, Toru Okabe: "Bond strength of binary titanium alloys to porcelain"Biomaterials. 22-12. 1675-1681 (2001)

Masanobu Yoda、Tatsuhiko Konno、Yukyo Takada、Kazunori Iijima、Jason Griggs、Osamu Okuno、Kohei Kimura、Toru Okabe：“二元钛合金与陶瓷的结合强度”生物材料。

Yukyo TAKADA, Hiroshi NAKAJIMA, Osamu OKUNO, Toru OKABE: "Microstructure and Corrosion Behavior of Binary Titanium Alloys with Beta-stabilizing Elements"Dental Materials Journal. 20・1. 34-52 (2001)

Yukyo TAKADA、Hiroshi NAKAJIMA、Osamu OKUNO、Toru OKABE：“含β稳定元素的二元钛合金的微观结构和腐蚀行为”牙科材料杂志 20・1（2001）。

Masanobu Yoda, Tatsuhiko Konno, Yukyo Takada et al.: "Bond strength of binary titanium alloys to porcelain"Biomaterials. 22・12. 1675-1681 (2001)

Masanobu Yoda、Tatsuhiko Konno、Yukyo Takada 等：“二元钛合金与瓷器的结合强度”22・12 1675-1681 (2001)。

Yukyo TAKADA, Hiroshi NAKAJIMA, Osamu OKUNO and Toru OKABE: "Microstructure and Corrosion Behavior of Binary Titanium Alloys with Beta-stabilizing Elements"Dental Materials Journal. 20-1. 34-52 (2001)

Yukyo TAKADA、Hiroshi NAKAJIMA、Osamu OKUNO 和 Toru OKABE：“含 Beta 稳定元素的二元钛合金的微观结构和腐蚀行为”牙科材料杂志。