Efficacy of Alveolar Ridge Preservation after Maxillary Molar Extraction in Reducing Crestal Bone Resorption and Sinus Pneumatization: A Multicenter Prospective Case-Control Study

Figure 2

Diagram summarizing main reference points taken for measurements. PN: sinus expansion between T0 and T1 (mm). RHm: vertical reduction of the alveolar bone measured (mm) in correspondence of the mesial socket, following the root axis and representing the linear difference between the most coronal position of the ridge at T0 and T1 and the root apex at T0. RW0: ridge width in the most coronal part of the crest at T0. RW1: ridge width in the most coronal part of the crest at T1.