title: [Selection of optimal length and diameter of mini implant in two different forces: a three-dimensional finite element analysis].
abstract: OBJECTIVE
  To investigate the effect of different length and diameters on the stability of mini implant and to select optimal length and diameter using continuous variation of parameters.
  
  
  METHODS
  To perform 3-dimensional finite element analysis, finite element models of a maxilla, and mini implants with length of 6-12 mm and diameters of 1.2-2.0 mm were generated. Load of two different forces were applied to the head of mini implant. One type was horizontal force (HF), the other was composite force (CF). The maximum equivalent stress (Max EQV) in maxilla and the maximum displacement (Max DM) of mini implant were evaluated.
  
  
  RESULTS
  The Max EQV in maxilla and Max DM of mini implant decreased as length and diameter increased. When length was more than 9 mm, the evaluation indexes were small and had a less change. Datas indicated that diameter played a more important role in reducing target, and was a more effective parameter in reducing Max EQV when CF was loaded.
  
  
  CONCLUSIONS
  From biomechanical point of view, the choice of the length should not be more than 9 mm. When CF is loaded using the mini implant, diameter exceeding 1.2 mm are optimal design for mini implant.
authors.forename: Yingjuan
authors.initials: Y
authors.lastname: Lu
authors.forename: Shaohai
authors.initials: S
authors.lastname: Chang
authors.forename: Hong
authors.initials: H
authors.lastname: Wu
authors.forename: Yansong
authors.initials: Y
authors.lastname: Yu
authors.forename: Yushan
authors.initials: Y
authors.lastname: Ye
authors.forename: Lanru
authors.initials: L
authors.lastname: Chang
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
mesh_terms: D015921:Dental Implants; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D006801:Humans; D008437:Maxilla; D013314:Stress, Mechanical
chemical_list: D015921:Dental Implants