title: Differences in Healing Patterns of the Bone-Implant Interface between Immediately and Delayed-Placed Titanium Implants in Mouse Maxillae.
abstract: BACKGROUND
  There are no available data on the healing process at the bone-implant interface after immediate implant placement.
  
  
  OBJECTIVE
  This study aimed to establish an animal experimental model of titanium implants placed in mouse maxillae and compare the healing pattern of the bone-implant interface after immediate implant placement with that after delayed implant placement.
  
  
  METHODS
  Maxillary first molars (M1) from 4-week-old mice were extracted and replaced with the implant following drilling (immediate-placement group). In contrast, M1 from 2-week-old mice were extracted, followed by drilling and implantation after 4 weeks (delayed-placement group). The decalcified samples at 0-28 days after implantation were processed by immunohistochemistry, terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling assay, and tartrate-resistant acid phosphatase histochemistry. The elements and bone volume of undecalcified samples were quantitatively analyzed by an electron probe microanalyzer.
  
  
  RESULTS
  Osseointegration was completed by 28 days after the procedure in both groups. There were no differences in contact area, bone loss at the cervical area, or rate of calcification at the bone-implant interface between the two groups.
  
  
  CONCLUSIONS
  This study found no significant differences in the chronological healing process at the bone-implant interface between the two groups at the cellular level.
authors: Division of Anatomy and Cell Biology of the Hard Tissue, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
authors: Taisuke
authors: T
authors: Watanabe
authors: Division of Anatomy and Cell Biology of the Hard Tissue, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
authors: Eizo
authors: E
authors: Nakagawa
authors: Division of Anatomy and Cell Biology of the Hard Tissue, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
authors: Kotaro
authors: K
authors: Saito
authors: Division of Anatomy and Cell Biology of the Hard Tissue, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
authors: Hayato
authors: H
authors: Ohshima
mesh_terms: D000818:Animals; D000069343:Bone-Implant Interface / Q000502:physiology*; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D057893:Immediate Dental Implant Loading; D008437:Maxilla / Q000601:surgery*; D051379:Mice; D016348:Osseointegration / Q000502:physiology; D014945:Wound Healing / Q000502:physiology*
chemical_list: D015921:Dental Implants
keywords: ICR mice; dental implants; maxilla; osseointegration; osteopontin; titanium; tooth extraction