[Mechanical analysis of composite archwire applied to anterior malocclusion with extraction of bilateral first premolars].
OBJECTIVE
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.


CONCLUSIONS
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).
Lin
Xing-nan
XN
Department of Orthodontics, Stomatological Hospital, Jilin University, Changchun 130041, Jilin Province, China.
Sun
Xin-hua
XH
Zhu
Xian-chun
XC
D001641:Bicuspid / Q000601:surgery; D003722:Dental Alloys / Q000737:chemistry*; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D006801:Humans; D008310:Malocclusion / Q000628:therapy*; D008334:Mandible; D009532:Nickel; D016382:Orthodontic Appliance Design; D009969:Orthodontic Wires; D013193:Stainless Steel; D014025:Titanium; D036542:Tomography, Spiral Computed; D014070:Tooth; D014081:Tooth Extraction; D014087:Tooth Movement Techniques
D003722:Dental Alloys; C040654:titanium nickelide; D013193:Stainless Steel; D009532:Nickel; D014025:Titanium