Purpose: To optimize the structure of composite archwire applied to anterior malocclusion with extraction of bilateral first premolars.
Methods: The mandibular model was scanned by spiral CT and 30 CT images were obtained, then the mandible finite element model and the archwire model was respectively established by means of SOLIDWORKS software and ANSYS software, mechanics analysis and calculation were carried out.
Results: The force produced by composite archwire applied to anteriorly malocclused teeth in the model was greater than by TiNi shape memory alloy but smaller than stainless steel: F(SS)>F(CoAw)>F(NiTi); As the diameter of NiTi in the composite archwire increased (the diameter of stainless steel kept unchanged) , the force on the malocclused teeth gradually increased; As the diameter of stainless steel in the composite archwire increased (the diameter of NiTi kept unchanged),the force on the malocclused teeth increased accordingly.
Conclusion: The rigidity of the composite archwire increases as the the diameter of NiTi increases; the rigidity of composite archwire also increases as the the diameter of the stainless steel increases.Supported by Research Fund of Jilin Provincial Bureau of Science and Technology (Grant No.20030539-3).