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| Effect of Different Attachment with Aligner in Mandibular Canine′s Labial-Lingual Direction Translation#br# |
1 Department of Chemical Engineering, Fuzhou University, Fuzhou 350116, China
2 Department of Mechanical Engineering, Fuzhou University, Fuzhou 350116, China |
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Abstract The aim of this work is to evaluate the influence of attachments on mandibular canine’s translation movement in labial-lingual direction with Invisalign. The three-dimensional CT scan technology accompanied with modeling software of Mimics and Geomagic Studio were used to model the mandibular tissues. Twelve different attachments used to assist the orthodontic tooth movement were built by Solidworks software. The obtained mandibular and attachment models were imported into ABAQUS software to build the finite element model. Thirteen orthodontic treatment simulations that aimed to move the mandibular canine from labial to lingual side 0.25 mm were operated in this study. Twelve simulations were operated with 12 different attachments, and one treatment simulation without attachment. The absolute value of the ratio of the maximum displacement in crown apical and root apex |Rcr| were used to evaluate the position of the canine’s rotation center. In the simulation case without attachment, the value of |Rcr| was 2.902, and the |Rcr| value in other simulation cases with attachments were all greater than 2.902. The |Rcr | average value was 1.57 in oval and rectangula attachments, and 2.25 in other 8 semi-body attachment cases. The canine moved more like translation when the attachment was semi-body type. In the simulation case without attachment, the maximum von Mises stress in canine’s periodontal ligament was 1.077 MPa. In other 12 simulations with attachments, the maximum von Mises stress in canine’s periodontal ligament was 1.129 MPa, only increased by 4.83% when compared with 1.077 MPa. The maximum von Mises stress value in 12 attachments was 245.1 MPa in oval horizontal attachment. Attachments are helpful to the canine’s translation movement. The attachments with large volume and area are not the most efficient. The most appropriate attachment in this orthodontic treatment was semi-tet left.
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