Figure 3: The linear measurements in histometric analysis L) Root length: length of the root surface; N) normal periodontium: combined longitudinal heights of the periodontal ligament had a normal histologic appearance; R) replacement resorption (ankylosis): combined longitudinal heights of ankylosis; S) surface resorption: combined longitudinal heights of resorption lacunae on the root surface without inflammatory cells in the area; I) inflammatory resorption: combined longitudinal heights of resorption lacunae on the root surface with inflammatory cells in the area