Finite element analysis of distal movement of canines under four loading methods
Objective:To compare the biomechanical changes of maxillary canines under four loading methods of straight-wire orthodontic technique using finite element analysis.Methods:A finite element model of the maxillary canine,periodontal ligament,maxillary bone,and orthodontic appliance was constructed.Four loading methods were set on the canine bracket wings,Method Ⅰ:Loading at the center of the mesial twin wings of the canine bracket,Method Ⅱ:Loading at the center of the distal twin wings of the canine bracket,Method Ⅲ:Loading at the center of all four wings of the canine bracket,Method IV:Loading at the traction hook of the canine bracket.A horizontal distal orthodontic force of 1 N was applied to the canine.The displacement trends and stress distribution in the tooth and periodontal ligament under the four loading methods were compared.Results:Under all four loading methods,the maxillary canines exhibited distal tipping movement with a tendency for mesial-labial and distal-lingual rotation.The stress distribution in the tooth and periodontal ligament was more uniform un-der Method IV,achieving closer to bodily movement than the other three methods,but the degree of rotational movement was greater.Conclusion:Among the four loading methods,Method IV was the most effective for distal movement of the maxillary canines.
CanineOrthodontic forceBracketFinite element analysis
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