LONG DISTANCE BILATERAL PREMOLAR AND MOLAR MESIALIZATION BY TEMPORARY ANCHORAGE DEVICE: A CASE REPORT OF CONGENITALLY MISSING MAXILLARY CANINES

Jindong Chen¹, Peng Wang²,  Guorong Zhang¹, Huang Li^{3 *} 

¹MDS, Lecturer, Department of Orthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, People's Republic of China - ²MDS, Lecturer, Department of Prosthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, People's Republic of China - ³DDS, PhD, Professor, Department of Orthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, People's Republic of China

Purpose: Distal to mesial space closure is one of the most difficult orthodontic tasks to achieve. Tooth-borne anchorage limits the scale of tooth movement. As an alternative to conventional mesialization appliances, temporary anchorage devices can be used for long distance, bilateral premolar and molar mesialization in orthodontic treatment. 

Methods: In the presented case, mini-screws were placed in the buccal alveolar bone of anterior mesialization of the premolars and molars. An anterior open bite appeared in the first three months after placement of the mini-screws. This was corrected after treatment using short, Class II elastics. There were no other side effects during treatment. 

Results: Good esthetic and dental results were achieved after 22 months of active treatment. 

Conclusion: Mini-screws can be used as orthodontic anchorage to move maxillary premolars and molars forward.