Cozzani Mauro, Azizi Arash, Eslami Sara, Darnahal Alireza, Pirhadirad Amirparham, Jamilian Abdolreza
Medical and Rehabilitation Area, Dental Sciences Section, United Campus of Malta HEI, Malta, USA.
Department of Oral and Maxillofacial Medicine, Tehran Medical Sciences, Craniomaxillofacial Research Centre, Islamic Azad University, Tehran, Iran.
Int Orthod. 2019 Mar;17(1):45-52. doi: 10.1016/j.ortho.2019.01.010. Epub 2019 Feb 14.
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.
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.
The amount of incise edge displacement was 2.609×10mm 2.682×10mm 2.875×10mm and 2.881×10mm in Alexander, Gianelly, Roth and MBT respectively with 100gr of retraction force. The value of apex root movement was 3.485×10mm 3.547×10mm 3.852×10mm and 3.864×10mm in Alexander, Gianelly, Roth and MBT respectively with 400g of retraction force.
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.
本研究的目的是借助三维有限元方法，比较包括亚历山大、罗斯、MBT（上颌横向生物适应性矫治器）和贾内利在内的四种托槽系统在滑动机制下对上颌前牙移动的影响。
当施加100、200、300、400克的后移力时，计算上颌中切牙切缘和根尖的位移、应力、应变、旋转中心及阻力。
在100克后移力作用下，亚历山大、贾内利、罗斯和MBT系统中切缘位移量分别为2.609×10毫米、2.682×10毫米、2.875×10毫米和2.881×10毫米。在400克后移力作用下，亚历山大、贾内利、罗斯和MBT系统根尖移动值分别为3.485×10毫米、3.547×10毫米、3.852×10毫米和3.864×10毫米。
在所有100、200、300、400克后移力下，MBT系统的根尖和切缘移动量最大。亚历山大系统在所有后移力下的根尖和切缘移动量最小。
