| 摘要 |
<p>A composite is disclosed having a controlled rate of dissolution. The composite includes (a) a first region that includes a first composition that includes calcium sulfate, the first region exhibiting a first rate of dissolution; and (b) a second region that includes a second composition that includes calcium sulfate, the second region exhibiting a second rate of dissolution, the first rate of dissolution being different from the second rate of dissolution.</p> |
