title: Bone Behavior in Relation to the Depth of the Line of Marginal Cementation of Prostheses on Morse Cone Implants: Radiographic Evaluation in a Dog Model.
abstract: OBJECTIVE
  This study was aimed at radiographically evaluating the effect of 3 different depths of the cementation line of prosthetic crowns on the bone response around Morse cone implants.
  
  
  METHODS
  Five dogs underwent extractions of the lower premolars; after 3 months, placement of 30 implants, 3 mm apical to the bone level, was performed. Prefabricated cylinders of alumina, used as abutments, with 3 different transmucosal extension were cemented to the implants with zinc oxide-eugenol cement, determining the depth of the cementation lines (1.5 mm apically, and 0.5 and 2.5 mm coronally, respectively, to the bone level). In the control group, implants and abutments were placed without crowns, therefore, with no cementation line.
  
  
  RESULTS
  The results showed no statistically significant differences between the control and test groups regarding the different depths of the cementation line both mesially (P = 0.18) and distally (P = 0.50).
  
  
  CONCLUSIONS
  Different depths of cementation did not affect the behavior of marginal bone, indicating that crowns can be cemented with zinc oxide-eugenol cement at any distance or even at the bone level without disturbing bone healing around Morse cone implants.
authors.affiliation: *Master in Oral Rehabilitation, Department of Prosthodontics, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil. †Master in Implantology, Federal University of Santa Catarina, UFSC, Florianópolis, Santa Catarina, Brazil. ‡Professor of Prosthodontics, Department of Prosthodontics, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil. §Assistant Professor, Department of Prosthodontics, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil. ¶Research Fellow, Department of Medical, Oral and Biotechnological Sciences, University G. d'Annunzio of Chieti-Pescara, Chieti, Italy. ‖Researcher, Department of Medical, Oral and Biotechnological Sciences, University G. d'Annunzio of Chieti-Pescara, Chieti, Italy.
authors.forename: Fernanda H
authors.initials: FH
authors.lastname: Stancari
authors.forename: Maria A
authors.initials: MA
authors.lastname: Rehder de Araujo
authors.forename: Paulo C
authors.initials: PC
authors.lastname: Rodrigues Conti
authors.forename: Carlos Dos Reis Pereira de
authors.initials: Cdos R
authors.lastname: Araujo
authors.forename: Bruna
authors.initials: B
authors.lastname: Sinjari
authors.forename: Giovanna
authors.initials: G
authors.lastname: Iezzi
authors.forename: Vittoria
authors.initials: V
authors.lastname: Perrotti
mesh_terms: D000818:Animals; D002484:Cementation / Q000379:methods; D003442:Crowns; D003738:Dental Cements / Q000627:therapeutic use; D015921:Dental Implants; D018772:Dental Marginal Adaptation; D019094:Dental Prosthesis, Implant-Supported / Q000379:methods; D004285:Dogs; D008297:Male; D011861:Radiography, Dental; D015035:Zinc Oxide-Eugenol Cement / Q000627:therapeutic use
chemical_list: D003738:Dental Cements; D015921:Dental Implants; D015035:Zinc Oxide-Eugenol Cement