Over the last few issues, we've been talking about the math entity called a matrix. I've given examples of how matrices are useful and how matrix algebra can simplify complicated problems. A messy ...

Geistlich Biomaterials has introduced two new sizes of its collagen matrix used in soft-tissue augmentation procedures. The company's Fibro-Gide line now includes 15 x 20 x 6-mm and 20 x 40 x 6-mm ...