Histological microphotographs of tension side of third incisiors in experiment groups.

Each panel includes two pictures of H&E staining with the amplifications of 100× (left) and 400× (right). (a) thin projection of alveolar bone spicules after compression for 12 d and consolidation for 1 d. (b) new bone formation accompanied by well-organized osteoblasts and extended, dense periodontal ligament space after 14 d of consolidation. (c) periodontal ligament space reverted to the normal status and new lamina dura formed after 28 d of consolidation.