| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a more aesthetic orthodontics bracket made of translucent ceramics and an industry method enabling mass production. <P>SOLUTION: The orthodontics bracket is made with translucent ceramics yielded by making a magnesium aluminum compound oxide (general formula MgAl<SB>2</SB>O<SB>4</SB>) sinter, which has a spinel crystal structure and contains 0.001 to 2.0 wt% of boron in boron oxide (B<SB>2</SB>O<SB>3</SB>) equivalent, to be a sinter with almost 100% relative density through an HIP process. The translucent ceramics has more than 60% of the linear transmittance of visible light having the wavelength of 550 nm and 7.5% or less of the surface reflectance at the thickness of 0.5 mm. The orthodontics bracket can be produced industrially using an injection molding method. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
