Left panel: Attenuation profiles (arbitrary units) from left to right through interradicular bone; bone formation in the mesial root-bone complex (left side) to bone resorption in the distal complex (right side) of the same molar. Attenuation of the “old” bone on the resorption side (right side) is generally higher and transition from PDL is steeper compared to the newly formed bone on the other side (left side). Right panel: sagittal section of a 7-week-old specimen with fluorochrome labeling; bone deposition predominantly in the mesial root-bone complex (white arrow), but also probably growth-related deposition in the distal complex (yellow arrow); note: predentin formation in the pulp (blue arrow), red stain on resorption pits (yellow stars); formation/repair of secondary cementum (blue stars). De = dentin, RB = interradicular bone, RC = root canal, and SC = secondary cementum.
