Figure 1.

Periodontal ligament regions scheme. (A) Sagittal section of 3-dimensional volume rendering of an in situ mouse first mandibular molar from a micro–computed tomography (CT) scan showing the tooth, alveolar bone, and interconnecting collagenous component of the PDL. Imaging was done on a fresh sample using a humidity chamber and phase enhancement by micro-CT according to our published method (Naveh et al. 2013, 2018). Colored regions highlight the furcation, dense collar, and apical regions as defined in this study for sample collection analysis. (B) Digital graphic depicting the transverse view of the PDL and surrounding structures at the section level used for mechanical analyses. Dense collar region was analyzed only on the buccal surface for biomechanics but analyzed from lingual and buccal surfaces for all other analyses.