Acute Periodontal Defect的用法和样例：
- Clinical Evaluation of a Collagen Barrier Membrane (Bio-Gide) Combined with a Bovine-derived Porous Xenograft (Bio-Oss) for the Treatment of Intrabony Periodontal Defects in Humans.
- They detected no defect in the product.
- This was his fatal defect; he was of feeble will.
- The patient is complaining of acute earache.
- A defect of focus, such as blurring in an image.