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A comparative assessment of developed novel power bridge with conventional power arm for en-masse retraction of maxillary six anterior teeth
Published in Elsevier Ltd
2022
Volume: 62
   
Issue: 6, SI
Pages: 3957 - 3962
Abstract
For en-masse retraction of protruded maxillary six anterior teeth, power arms are attached on the archwire as a general practice to pass the force vector through centre of resistance (Cres) of maxillary six anterior teeth. As a power arm is similar to cantilever beam, it gets more deflected at free end (hook end) where retraction spring is attached. Additionally, the equivalent stresses at base of power arm increases due to deflection of power arm. The developed novel power bridge in this research study has a parabolic shape as parabolic arches can support larger load with less deformation. To verify the performance of the power bridge, finite element analysis was done to compare the results of equivalent (von-mises) stresses and total deformation of this novel power bridge and conventional power arm. The cross-sections of segments of both power bridge and power arm were kept uniform and equal to justify the results of finite element analysis. The maximum equivalent (von-mises) stress in the teeth assembly model with power arm was found to be 10.42 times greater than the teeth assembly model with power bridge. Thus, power bridge structure developed in this study can be considered as approximately 10 times safer than the power arm structure. The maximum total deformation in the teeth assembly model with power arm was found to be 92 times greater than the teeth assembly model with power bridge. Thus, power bridge structure developed in this study can be considered as 92 times stiffer than the power arm structure. So, it is clear that the power bridge structure is significantly safer and stiffer than the power arm structure. Hence, this research study suggests that the power bridge structure should be used instead of power arm once the efficacy of power bridge structure is tested and proved clinically. © 2022
About the journal
JournalMaterials Today: Proceedings
PublisherElsevier Ltd
ISSN22147853
Open AccessNo