title: Impact of insertion torque and implant neck design on peri-implant bone level: a randomized split-mouth trial.
abstract: OBJECTIVE
  The aim of this study is to assess the impact of insertion torque and implant neck design on peri-implant bone levels and gain insights into dynamic crestal tissue alterations by radiological, clinical, and biochemical examinations.
  
  
  METHODS
  In this prospective trial, a total of 84 implants (four implants in each patient) in the interforaminal region of 21 edentulous mandibles were randomly alternated according to a split-mouth design. Implant placement was performed using different insertion torques (≤20 Ncm vs >50 Ncm). In each group, one machined and one anodized implant neck design (1.5 mm length) was used in the same jaw side. Evaluation of peri-implant tissues involved radiological, clinical examination and immunoassays for interleukin-1β.
  
  
  RESULTS
  No significant influence of insertion torque or implant neck design on peri-implant bone level was found. Protein levels of interleukin-1β in the peri-implant crevicular fluid revealed no difference between both insertion torque groups and different neck designs.
  
  
  CONCLUSIONS
  Interactive effects of insertion torque and neck surface modification may exist; however, no clinically significant differences in marginal bone resorption after 1 year could be observed in the edentulous anterior mandible.
authors: Department of Oral Surgery, Bernhard Gottlieb University Clinic of Dentistry, Medical University of Vienna, Vienna, Austria.
authors: Markus
authors: M
authors: Hof
authors: Bernhard
authors: B
authors: Pommer
authors: Georg D
authors: GD
authors: Strbac
authors: Christoph
authors: C
authors: Vasak
authors: Hermann
authors: H
authors: Agis
authors: Werner
authors: W
authors: Zechner
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015921:Dental Implants; D005260:Female; D006801:Humans; D007575:Jaw, Edentulous / Q000601:surgery; D008297:Male; D008875:Middle Aged; D016348:Osseointegration; D011446:Prospective Studies; D011474:Prosthesis Design
chemical_list: D015921:Dental Implants
keywords: bone-implant interface; crestal bone loss; crevicular fluid analysis; edentulous mandible; implant neck design; implant stability; insertion torque; osseointegration; tapered implants