title: Effect of conical configuration of fixture on the maintenance of marginal bone level: preliminary results at 1 year of function.
abstract: OBJECTIVE
  To evaluate and to compare the effect of the conical neck design on marginal bone loss around the fixtures, when both implants were provided with micro-threads to the top of the fixture.
  
  
  METHODS
  Two types of implant, one with a straight shape (S) and the other with a conical neck design (C) provided with a retentive element to the top of the fixture, were placed adjacent to each other in the partially edentulous areas of 12 patients. Bone loss around each implant was analyzed after 1 year of functional loading. The bone losses after loading were compared using Wilcoxon's signed-rank test.
  
  
  RESULTS
  The mean marginal bone losses (S, 0.05 + or - 0.09 mm; C, 0.07 + or - 0.14 mm) were not statistically significant between the two groups (P=0.578).
  
  
  CONCLUSIONS
  There was no significant difference between conical and straight neck implants in terms of marginal bone loss after 1 year of loading.
authors.affiliation: Department of Periodontology, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: Jung-Joo
authors.initials: JJ
authors.lastname: Kim
authors.forename: Dong-Won
authors.initials: DW
authors.lastname: Lee
authors.forename: Chong-Kwan
authors.initials: CK
authors.lastname: Kim
authors.forename: Kwang-Ho
authors.initials: KH
authors.lastname: Park
authors.forename: Ik-Sang
authors.initials: IS
authors.lastname: Moon
mesh_terms: D000368:Aged; D016301:Alveolar Bone Loss / Q000517:prevention & control*; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D018709:Statistics, Nonparametric
chemical_list: D015921:Dental Implants