What is the success rate of an implant placed into radiated bone compared to non-radiated bone?

• A. Higher success rate
• B. The same success rate
• C. Lower success rate
• D. Variable success rate

Answer: (C)

The success rate of an implant placed into radiated bone is generally considered to be lower compared to that of non-radiated bone. This is primarily due to changes in the biological and structural properties of the bone that have been subjected to radiation, which can lead to complications in osseointegration.

Radiation therapy, particularly in the head and neck region, can cause tissue fibrosis, reduced vascularity, and altered bone remodeling, all of which can compromise the healing process and the subsequent stability of dental implants. The irradiated bone experiences poorer quality and quantity of available bone, making it less conducive to successful implant integration.

In contrast, non-radiated bone typically has a more robust vascular supply and better biological response to implant placement, leading to a higher rate of success in terms of osseointegration and long-term viability of the implant. Hence, the notion that implants in irradiated bone have a lower success rate is consistent with the clinical observations and research findings in the field.