Abstract: Objective: To improve periodontal accelerated osteogenic orthodontics (PAOO) technique and suspensory suture method, and to preliminarily evaluate the effects of them. Methods: The PAOO technique and suspensory suture method were modified respectively. Six patients were treated with new operative and suture methods. 2 mm partial thickness flap was dissected from 3 or 4 mm below gingival margin. Full-thickness flap was preformed downwards. In the operation area, bone dust and gingival flap were restored. The needle and thread were passed through flap, and then were passed from the bottom of gingival papilla to the lingual gingival sulcus. The needle was placed around the lingual surface of the tooth, and was passed from the bottom of gingival papilla on the other side of the tooth, and then passed through the flap. The procedure was repeated and the suture was brought back to the starting point. Cone-beam computed tomography (CBCT) were used to evaluate the alveolar bone before and 3 months after surgery. Graphpad was used to carry out statistic analyze. Results: CBCT showed the thickness of buccal alveolar in root-middle 1/3 of the anterior tooth root increased from (0.98±0.33) mm to (3.64±0.89) mm, and the thickness of root-apical 1/3 increased from (1.28±0.57) mm to (3.97±1.04) mm. The bone thickness of root-middle and -apical significantly increased. Conclusion: The novel PAOO method with modified suspensory suture can effectively increase the bone thickness of buccal alveolar. The modified methods showed effective clinical results. However, long term follow-up is still needed in further study.

Key words: periodontally accelerated osteogenic orthodontics, alveolar fenestration, alveolar dehiscence, modified suspensory suture, bone increment