Biocompatibility and Chemical Stability

Metal Bone Screws: Long-term implantation may release metal ions, such as nickel and chromium, which can cause allergic reactions or inflammation in some patients.

**Biodegradable plastic Bone Screws: **They offer extremely high chemical inertness and biological stability.

Advantages: They are non-cytotoxic, do not cause allergic reactions, and will not degrade or corrode in the long-term in vivo environment, including exposure to body fluids and pH fluctuations.