Fig. 4

A simple diagram describing alveolar modeling/remodeling. When an incisor was retracted, the bending of the labial and palatal cortex followed the direction of the incisor movement, thus leading to alveolar surface modeling and inner PDL remodeling (a). The areas of alveolar surface modeling and inner PDL remodeling were measured (b). Paired comparisons between A1 and A2 (c, d), A1 and A3 (c, e), A2 and A4 (d, f) were performed to analyze alveolar morphological changes