title: Influence of the Localization of Frontal Bone Defects on Primary Stability Values of 2 Different Implant Designs: An In Vitro Study.
abstract: OBJECTIVE
  The aim of this study was to determine the influence of different frontal bone defect localizations on primary stability values of 2 different implant designs.
  
  
  METHODS
  Eight cow rib segments were prepared before implant installation, as 2 segments with coronal, 2 with middle, and 2 with apical defects and 2 with control. Thirty-two cylindrical and 32 tapered implants were placed in the remaining 4 segments. Implant stability measurements were performed using electronic percussive testing and resonance frequency analysis.
  
  
  RESULTS
  No significance was detected between the stability values of the 2 implant designs except the implant stability quotient (ISQ) of control groups. The tapered implants control group showed significantly higher lateral ISQs compared with cylindrical implants (P = 0.033). For both implant types, stability values were significantly lower in coronal defects (P < 0.01). No significant differences were detected in other defect types.
  
  
  CONCLUSIONS
  Within the limitations of this study, it may be concluded that coronal defects may influence primary stability negatively, compared with middle and apical defects. Although statistically not significant, coronal defects caused lower primary stability values with the tapered design compared with parallel design.
authors.affiliation: *Assistant Professor, Department of Oral and Maxillofacial Surgery, Dentistry School, Okan University, Istanbul, Turkey. †Associate Professor, Department of Prosthodontics, Dentistry School, Okan University, Istanbul, Turkey. ‡Professor, Department of Oral and Maxillofacial Surgery, Dentistry School, Okan University, Istanbul, Turkey. §Assistant Professor, Department of Prosthodontics, Dentistry School, Okan University, Istanbul, Turkey. ¶Assistant Professor, Department of Periodontology, Dentistry School, Okan University, Istanbul, Turkey. ‖Associate Professor, Department of Prosthodontics, Dentistry School, Istanbul University, Istanbul, Turkey.
authors.forename: Ugur
authors.initials: U
authors.lastname: Mercan
authors.forename: Hakan
authors.initials: H
authors.lastname: Bilhan
authors.forename: Deniz Gokce
authors.initials: DG
authors.lastname: Meral
authors.forename: Sehnaz
authors.initials: S
authors.lastname: Kazokoglu
authors.forename: Gokce
authors.initials: G
authors.lastname: Aykol-Sahin
authors.forename: Onur
authors.initials: O
authors.lastname: Geckili
mesh_terms: D000818:Animals; D000069343:Bone-Implant Interface / Q000473:pathology*; D002417:Cattle; D015921:Dental Implants; D017267:Dental Prosthesis Design / Q000379:methods; D017268:Dental Prosthesis Retention; D003799:Dental Stress Analysis / Q000379:methods; D005624:Frontal Bone / Q000473:pathology / Q000601:surgery*; D066298:In Vitro Techniques; D012272:Ribs / Q000601:surgery
chemical_list: D015921:Dental Implants