title: Influence of platelet-rich plasma on osseous healing of dental implants: a histologic and histomorphometric study in minipigs.
abstract: OBJECTIVE
  In the present study the time course of local bone formation following the application of PRP during implant placement was evaluated histomorphometrically and histologically.
  
  
  METHODS
  The mandibular premolars of 12 adult minipigs were removed surgically and 72 sites were prepared for implant placement. Before the implants (MK III, Replace, and MK III TiUnite) were placed, autogenous PRP (8 x 10(5) to 10 x 10(5) platelets/microL) was instilled into the host sites on the left side. The animals were sacrificed at 3, 6, and 12 weeks, and undecalcified ground sections were prepared.
  
  
  RESULTS
  The histomorphometric evaluation showed significantly more bone-to-implant contact after topical PRP application in the early healing phase (6 weeks), which varied as a function of the distance from the implant surface (controls = 24.2% versus PRP = 44.21%; P = .013). At 12 weeks, the extent of osteoneogenesis was comparable in the 2 groups (controls = 51.3% versus PRP = 44.2%; P = .251). Statistical analysis revealed no significant interaction between implant surface type and PRP.
  
  
  CONCLUSIONS
  Topical PRP application significantly increased the activity of bone regeneration at implant host sites during early healing.
  
  
  CONCLUSIONS
  In the present study PRP was found to have a time- and site-dependent effect on peri-implant bone healing.
authors.affiliation: Department of Oral Surgery, Dental School of the University of Vienna, Austria and Ludwig Boltzmann Institute of Oral Implantology, Vienna, Austria. werner.zechner@univie.ac.at
authors.forename: Werner
authors.initials: W
authors.lastname: Zechner
authors.forename: Stefan
authors.initials: S
authors.lastname: Tangl
authors.forename: Gabor
authors.initials: G
authors.lastname: Tepper
authors.forename: Gabor
authors.initials: G
authors.lastname: Fürst
authors.forename: Thomas
authors.initials: T
authors.lastname: Bernhart
authors.forename: Robert
authors.initials: R
authors.lastname: Haas
authors.forename: Georg
authors.initials: G
authors.lastname: Mailath
authors.forename: Georg
authors.initials: G
authors.lastname: Watzek
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D001792:Blood Platelets / Q000502:physiology*; D001861:Bone Regeneration / Q000502:physiology; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D015921:Dental Implants; D017886:Durapatite / Q000737:chemistry; D016018:Least-Squares Analysis; D016015:Logistic Models; D008334:Mandible / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D016348:Osseointegration; D010012:Osteogenesis / Q000502:physiology; D017713:Platelet Transfusion; D013499:Surface Properties; D013552:Swine; D013556:Swine, Miniature; D013997:Time Factors; D014025:Titanium / Q000737:chemistry; D014945:Wound Healing / Q000502:physiology
chemical_list: D020099:Coated Materials, Biocompatible; D015921:Dental Implants; D017886:Durapatite; D014025:Titanium