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    • 6. 发明授权
    • Ceramic orthodontic appliance
    • 陶瓷矫正器具
    • US4954080A
    • 1990-09-04
    • US248297
    • 1988-09-21
    • John S. KellyHenrick K. Gille
    • John S. KellyHenrick K. Gille
    • A61C7/12
    • A61C7/12
    • An orthodontic bracket or similar orthodontic appliance is made of a polycrystalline ceramic having a translucency which minimizes visibility of the appliance when mounted on a tooth. The ceramic is formed by pressing a powder material, such as high purity aluminum oxide, and sintering to yield a single phase appliance having substantially zero porosity and an average grain size preferably in the range of 10 to 30 microns. The substantially color-free ceramic appliance has desirable strength and other mechanical properties combined with a translucency which permits the natural color of the tooth to diffusely show through in a fashion tending to make the appliance blend with and disappear against the tooth.
    • 正畸托架或类似的矫正器具由具有半透明度的多晶陶瓷制成,其在安装在牙齿上时使器具的可视性最小化。 通过压制诸如高纯度氧化铝的粉末材料并烧结来形成陶瓷,以产生具有基本上零孔隙率和平均晶粒度的单相器具,优选在10至30微米的范围内。 基本上无色的陶瓷器具具有期望的强度和其它机械性质与半透明性相结合,其允许牙齿的自然颜色以倾向于使器具与牙齿混合并消失的方式扩散地显示穿透。