title: Buccal and lingual bone level alterations after immediate implantation of four implant surfaces: a study in dogs.
abstract: OBJECTIVE
  Bone formation and maintenance around implants placed immediately after tooth extraction may be affected by implant surface treatment and compromise long-term esthetic results. This study morphometrically evaluated buccal bone loss and bone-to-implant contact (BIC) of four implant systems placed immediately after tooth extraction in a dog model.
  
  
  METHODS
  The premolars of eight beagle dogs were bilaterally extracted with a full-thickness flap, and root-form dental implants were placed on the root extraction socket. Implants (n = 16 each) with different surface treatments were placed from sites 1 to 4 and alternated between animals to allow evaluation of the same number of implants at sites and evaluation time points. Implant surface treatments were as follows: anodized, discrete crystalline deposition, SLActive, and microblasted. The left and right side provided implants that stayed for 2 and 4 weeks, respectively. Submerged healing was allowed and bone-to-implant contact (BIC) and buccal bone loss were morphometrically measured. Linear mixed models (P < 0.05) were used to assess differences between groups, across time, and their interaction.
  
  
  RESULTS
  Buccal bone loss was observed to approximately double between 2 and 4 weeks (P = 0.01). BIC also increased between 2 and 4 weeks, by 20-25% (P = 0.01). These changes were statistically similar for each surface.
  
  
  CONCLUSIONS
  When placed immediately after tooth extraction, the evaluated histomorphometric parameters vary only with time.
authors.affiliation: Postgraduate Program in Dentistry, UNIGRANRIO University, School of Health Sciences, Duque de Caxias, RJ, Brazil.
authors.forename: Estevam A
authors.initials: EA
authors.lastname: Bonfante
authors.forename: Malvin N
authors.initials: MN
authors.lastname: Janal
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Granato
authors.forename: Charles
authors.initials: C
authors.lastname: Marin
authors.forename: Marcelo
authors.initials: M
authors.lastname: Suzuki
authors.forename: Nick
authors.initials: N
authors.lastname: Tovar
authors.forename: Paulo G
authors.initials: PG
authors.lastname: Coelho
mesh_terms: D016301:Alveolar Bone Loss / Q000503:physiopathology*; D000818:Animals; D015921:Dental Implants; D004285:Dogs; D057893:Immediate Dental Implant Loading; D020007:Implants, Experimental; D008334:Mandible / Q000601:surgery; D010012:Osteogenesis / Q000502:physiology*; D014081:Tooth Extraction; D014945:Wound Healing / Q000502:physiology
chemical_list: D015921:Dental Implants