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Modification of Electrochemically Deposited Apatite Using Supercritical Water and its Dental Application

超临界水电化学沉积磷灰石的改性及其牙科应用

基本信息

批准号：
12671912
负责人：
BAN Seiji
金额：
$ 2.18万
依托单位：
Kagoshima University (2001)Aichi Gakuin University (2000)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12671912/
关键词：
Supercritical water Electrochemical deposition Apatite Dental implant Surface modification

项目摘要

Supercritical water was used as a modification method of electrochemically deposited apatite on pure titanium. The apatites were coated on a commercially pure titanium plate using a hydrothermal-electrochemical method. A constant direct current at 12.5 mA/cm^2 was loaded for 1 hr at 25, 60, 100, 150 and 200℃ in an electrolyte containing calcium and phosphate ions. The deposited apatite on the titanium substrate was stored in supercritical water at 450℃ under 45 MPa for 8 hr. With this treatment, the crystallinity of the apatites increased, sharp edges of the deposited apatites were rounded off, and the bonding strength of the titanium substrate to the deposited apatites significantly increased. On the other hand, weight loss in 0.01 N HC1 decreased and the weight gain rate in a simulated body fluid also decreased with this treatment. It is suggested that the modification using supercritical water improved the mechanical strength of the deposited apatite, but worsened its bioactivity.Furthermore, pure titanium and 12 % AuPdAg alloy plates after sandblasting were treated with super critical water )SCW) in an autoclave under 45MPa at 450℃. Field emission-type scanning electron microscopy showed that fine particles, less than 0.2μm, were formed on the cpTi with SCW and thick layer was formed on the surface heated at 600℃ in air. X-ray diffractometric study revealed that TiO_2 was formed on the cpTi with both the treatments. The bonding strength of two types of veneering resin to both metal plates with and without the above treatments were determined. The bonding strengths of cpTi with SCW to the one resin were larger than the other conditions )p<0.05).

采用超临界水作为纯钛上电化学沉积磷灰石的改性方法。使用水热电化学方法将磷灰石涂覆在商业纯钛板上。在含有钙离子和磷酸根离子的电解液中，在25、60、100、150和200℃下，以12.5 mA/cm^2的恒定直流电流加载1小时。将沉积在钛基体上的磷灰石在450℃、45MPa的超临界水中保存8小时。通过这种处理，磷灰石的结晶度增加，沉积的磷灰石的锋利边缘变圆，钛基体与沉积的磷灰石的结合强度显着增加。另一方面，通过该处理，0.01N HCl中的体重减轻减少，并且模拟体液中的体重增加率也减少。超临界水改性提高了沉积磷灰石的机械强度，但降低了其生物活性。此外，将喷砂后的纯钛和12％AuPdAg合金板在45MPa、450℃的高压釜中用超临界水（SCW）处理。场发射型扫描电镜显示，超临界水处理后的cpTi上形成了小于0.2μm的细颗粒，并在空气中600℃加热的表面形成了厚层。 X射线衍射研究表明，两种处理方法均在cpTi上形成了TiO_2。测定了经过和未经上述处理的两种贴面树脂对两种金属板的粘合强度。具有 SCW 的 cpTi 对一种树脂的粘合强度大于其他条件 (p<0.05)。