Dental Fiber Posts
How fiber posts reinforce endodontically treated teeth.
Dental fiber posts are prefabricated cylindrical or tapered posts made from glass, quartz, or carbon fibers embedded in a resin matrix. They are placed into the root canal of endodontically treated teeth to provide retention for the core buildup, which supports the final crown restoration. Fiber posts have largely replaced metal posts due to their superior aesthetics and biomechanical properties. The key advantage of fiber posts is their elastic modulus, which closely matches that of dentin (approximately 18-25 GPa). This biomimetic property distributes stress evenly along the root, significantly reducing the risk of catastrophic root fracture that can occur with stiffer metal posts. If failure does occur, it typically involves the post or cement rather than the root, allowing for retreatment. Fiber posts are bonded into the canal using resin cement and adhesive systems, creating a unified restoration called a monoblock. Light-transmitting posts allow some degree of light curing through the post itself. The translucent or white color of fiber posts avoids the dark shadow that metal posts can cast through all-ceramic crowns, making them essential for aesthetic restorations.