title: Bone microstrain values of 1-piece and 2-piece implants subjected to mechanical loading.
abstract: OBJECTIVE
  The purpose of this study was to measure and compare the strain levels in peri-implant bone as generated by 1-piece (1P) and 2-piece (2P) implant systems.
  
  
  METHODS
  The implants (1P and 2P) were placed into bovine bone according to the manufacturer's protocol. Four linear strain gauges were placed around each implant neck and apex. Each model was loaded in static loading by a material testing machine in ascending forces ranging from 20 to 120 N. Microstrains (μ[Latin Small Letter Open E]) generated in the surrounding bone were measured by a strain gauge and recorded.
  
  
  RESULTS
  Recorded microstrains were significantly higher for 1P implants than for 2P implants. Average recorded microstrain values were significantly lower in the neck (71.6 and 17.3 µs) compared with the apical (132 and 60 µs) regions of 1P and 2P implants, respectively (P < 0.0001).
  
  
  CONCLUSIONS
  Within the limitations of this study, highest microstrains were generated in apical regions regardless of implant design, but the 2P implant ap-peared to provide a stress-damping effect in both the cervical and apical regions compared with the 1P implant.
authors.affiliation: Department of Oral Rehabilitation, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv 69978, Israel. noga.hrl@gmail.com
authors.forename: Noga
authors.initials: N
authors.lastname: Harel
authors.forename: Inbar
authors.initials: I
authors.lastname: Eshkol-Yogev
authors.forename: Dana
authors.initials: D
authors.lastname: Piek
authors.forename: Shiri
authors.initials: S
authors.lastname: Livne
authors.forename: David
authors.initials: D
authors.lastname: Lavi
authors.forename: Zeev
authors.initials: Z
authors.lastname: Ormianer
mesh_terms: D000539:Alveolar Process / Q000502:physiology*; D000818:Animals; D002417:Cattle; D015921:Dental Implants; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis; D012272:Ribs
chemical_list: D015921:Dental Implants