Do you have any data to show that composites can last as long as amalgams?

The Dental Advisor has just completed a 15-year clinical performance report on 3M ESPE Z100 Restorative composite. The report showed that out of 129 restorations placed in 1992, 81% showed no fracture or chipping, 72% still showed excellent shade match, and 84% showed no evidence of any wear. The composite received a 96% overall clinical rating. This is an excellent result for 15 years after placement. This shows that, at least with this product, composites can be as long-lasting as amalgams.