Three Dimensional Finite Element Analysis of the Influence of Attachment Differences on Posterior Tooth Displacement During the Expansion of Maxillary Arch with Non Bracket Concealed Orthodontic Appliances
Objective To analyze the effect of using fully fractured precision scanning modeling on the three-dimensional displacement of posterior teeth when expanding the maxillary arch with a non bracket invisible orthodontic appliance.Methods 86 adult patients who visited the orthodontic department of the author's hospital from January 2017 to June 2022 were selected as the research subjects.All patients had Class I malocclusion,and the treatment plan was designed to align the upper and lower anterior teeth only through adjacent enamel removal.Based on accurate scanning modeling of the entire dental arch,a non bracket invisible orthodontic device was constructed to compare the three-dimensional finite element models of the posterior teeth before and after maxillary arch expansion.Results The ratio of the maximum displacement(3.315 17)to the minimum displacement(3.139 25)in Group 5 is the smallest among all groups.Compared with other groups,the minimum displacement in Group 5 is closer to the root tip;The equivalent stress value obtained for the second premolar in Group 5 is the smallest,and the stress distribution is more uniform.Conclusion When the attachment effect is applied,the root control effect on premolars is significantly better than that on molars,and the optimized post expansion support attachment has a better root control effect on posterior teeth.
three dimensional finite elementnon bracket invisible applianceattachmentexpansion of maxillary
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