Mauro Cozzani1, Arash Azizi2, Sara Eslami3, Alireza Darnahal3, Amirparham Pirhadirad4, Abdolreza Jamilian5. 1. Medical and Rehabilitation Area, Dental Sciences Section, United Campus of Malta HEI, Malta, USA. 2. Department of Oral and Maxillofacial Medicine, Tehran Medical Sciences, Craniomaxillofacial Research Centre, Islamic Azad University, Tehran, Iran. 3. Department of orthodontics, Dental School, Craniomaxillofacial Research Centre, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran. 4. Department of Bio Medical Engineering, Faculty of Bio Medical Engineering, Science and Research Branch, Tehran Dental Branch, Cranio maxillofacial Research Centre, Islamic Azad University, Tehran, Iran. 5. Department of orthodontics, Dental School, Craniomaxillofacial Research Centre, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran. Electronic address: info@jamilian.net.
Abstract
The purpose of this study was to compare the effect of a 4-bracket system including Alexander, Roth, MBT (Maxillary Transverse Bioadaptation), and Gianelly on the upper anterior tooth movement in sliding mechanics with the help of a 3-Dimensional (3D) Finite Element Method. METHODS: Displacement, stress, strain, centre of rotation and resistance on the incise edge and apex of the maxillary central incisor were calculated when 100, 200, 300, 400grams of retraction force were applied. RESULTS: The amount of incise edge displacement was 2.609×10-4mm 2.682×10-4mm 2.875×10-4mm and 2.881×10-4mm in Alexander, Gianelly, Roth and MBT respectively with 100gr of retraction force. The value of apex root movement was 3.485×10-4mm 3.547×10-4mm 3.852×10-4mm and 3.864×10-4mm in Alexander, Gianelly, Roth and MBT respectively with 400g of retraction force. CONCLUSIONS: The MBT system had the maximum apex root and incisal edge movement in all 100, 200, 300, 400grams of retraction force. The Alexander system had the lowest apex and incisal edge movement in all retraction forces.
The purpose of this study was to compare the effect of a 4-bracket system including Alexander, Roth, MBT (Maxillary Transverse Bioadaptation), and Gianelly on the upper anterior tooth movement in sliding mechanics with the help of a 3-Dimensional (3D) Finite Element Method. METHODS: Displacement, stress, strain, centre of rotation and resistance on the incise edge and apex of the maxillary central incisor were calculated when 100, 200, 300, 400grams of retraction force were applied. RESULTS: The amount of incise edge displacement was 2.609×10-4mm 2.682×10-4mm 2.875×10-4mm and 2.881×10-4mm in Alexander, Gianelly, Roth and MBT respectively with 100gr of retraction force. The value of apex root movement was 3.485×10-4mm 3.547×10-4mm 3.852×10-4mm and 3.864×10-4mm in Alexander, Gianelly, Roth and MBT respectively with 400g of retraction force. CONCLUSIONS: The MBT system had the maximum apex root and incisal edge movement in all 100, 200, 300, 400grams of retraction force. The Alexander system had the lowest apex and incisal edge movement in all retraction forces.