title: Comparison of implant body designs and threaded designs of dental implants: a 3-dimensional finite element analysis.
abstract: OBJECTIVE
  Stress analysis was performed for various implant designs using 3-dimensional finite element analysis approaches.
  
  
  METHODS
  Six implant designs were included: 3 parallel-sided implants (no thread, triangular thread, and squared thread), 2 stepped configurations (non-thread and triangular thread), and a tapered body of implant with squared thread. All threads had spiral characteristics. The mandibular model was constructed from computed tomographic (CT) images of a human mandible, and the material properties were anisotropic (different in different directions). A 100-N oblique force was applied at a 45-degree angle to the long axis of the implants at the buccal cusp as the loading condition.
  
  
  RESULTS
  Compared with cylindric implants, threaded implants (either triangular or squared) demonstrated increased peak stress at the crestal bone. The bone stress of stepped implants was decreased in the cortical region but was increased in the trabecular region. However, both threaded and stepped designs showed decreased interfacial stresses of bone near the valleys of the threaded and stepped areas. The tapered design decreased stresses by up to 32% in the cortical region and 17% in the trabecular region.
  
  
  CONCLUSIONS
  Although threaded implants could not decrease the peak stress at the crestal bone, both threaded and stepped designs show an ability to dissipate the interfacial stresses of bone. The use of tapered implants could reduce peak stress in both cortical and trabecular bone.
authors.affiliation: School of Dentistry, China Medical University, Taichung, Taiwan.
authors.forename: Heng-Li
authors.initials: HL
authors.lastname: Huang
authors.forename: Chin-Han
authors.initials: CH
authors.lastname: Chang
authors.forename: Jui-Ting
authors.initials: JT
authors.lastname: Hsu
authors.forename: Alison M
authors.initials: AM
authors.lastname: Fallgatter
authors.forename: Ching-Chang
authors.initials: CC
authors.lastname: Ko
mesh_terms: D001696:Biomechanical Phenomena; D003198:Computer Simulation; D015921:Dental Implants; D017267:Dental Prosthesis Design; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional; D008334:Mandible / Q000033:anatomy & histology / Q000502:physiology; D008422:Materials Testing; D008954:Models, Biological; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D015921:Dental Implants