Which type of periodontal fiber is found only between the roots of multi-rooted teeth?

Interradicular fibers are specifically located in the periodontal ligament between the roots of multi-rooted teeth, such as molars. Their main role is to provide support and anchorage to the tooth within the alveolar bone, helping to withstand the forces generated during chewing. By being positioned between the roots, these fibers help to maintain the stability of the tooth and prevent excessive movement.

The other types of periodontal fibers have different roles and locations. Horizontal fibers run horizontally around the tooth, providing support at the cervical area. Apical fibers are found at the apex of the tooth root and help to support the tooth against forces coming from below. Oblique fibers, located at an angle, primarily help resist vertical masticatory forces.

Understanding the specific location and function of interradicular fibers is important for recognizing their unique contribution to dental anatomy and periodontal health, particularly in multi-rooted teeth.