title: Biomechanics and peri-implantitis: The effect of a subcrestal wing-thread to decrease alveolar crestal bone strain. theory, finite element analysis, and clinical application.
abstract: OBJECTIVE
  This study used finite element analysis and a clinical case example to test the hypothesis that a wing-thread placed 4 mm below the top of an implant would decrease crestal bone loss in function.
  
  
  METHODS
  Finite element analysis was used to compare standard and wing-thread implants subjected to axial and off-axis forces based on the hypothesis that decreasing bone strain at the alveolar crestal margin improves peri-implant bone stability. A clinical case example of the wing-thread implant was followed for 30 months.
  
  
  RESULTS
  Stress concentration was diminished at the crest when a wing-thread was used compared to a standard implant body. Ninety-degree lateral forces were diminished by a factor of 10 in the wing-thread implant. A patient followed for 30 months showed stable bone levels around the wing-thread implants.
  
  
  CONCLUSIONS
  The wing-thread hypothesis appears to have some support for increasing bone stability based on finite element analysis and early clinical results.
authors.forename: Zvi
authors.initials: Z
authors.lastname: Laster
authors.forename: Ilan
authors.initials: I
authors.lastname: Weissberg
authors.forename: Fares
authors.initials: F
authors.lastname: Kablan
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D003758:Dental Implantation, Endosseous / Q000295:instrumentation*; D015921:Dental Implants; D017267:Dental Prosthesis Design; D020342:Finite Element Analysis; D006801:Humans; D057873:Peri-Implantitis / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000517:prevention & control; D011859:Radiography
chemical_list: D015921:Dental Implants