What characteristic of an autogenous bone graft relates to the viability of osteoblasts?

• A. Less viable when milled
• B. More viable when unmilled
• C. Higher viability with age
• D. Independence from milling process

Answer: (B)

The characteristic of an autogenous bone graft that relates to the viability of osteoblasts being more viable when unmilled is rooted in the nature of the bone itself and the processes involved in harvesting and preparing the graft.

When bone is milled, the osteoblasts, which are the cells responsible for new bone formation, can suffer damage due to the mechanical process of milling. This is because milling often involves significant forces that can crush or destroy the cells, resulting in a lower density of viable osteoblasts in the graft material. Unmilled bone grafts, on the other hand, retain their natural architecture and structural integrity, allowing for a greater number of healthy and functional osteoblasts to remain viable in the graft.

This retention of viable osteoblasts is crucial for the graft's ability to assimilate with the host bone and promote healing and regeneration. The presence of viable osteoblasts directly correlates to the graft's osteogenic potential and overall success in bone healing processes.