title: Comparison of Bone Loss around Bone Platform Shift and Non-Bone Platform Shift Implants After 12 Months.
abstract: OBJECTIVE
  The aim of the present randomized clinical trial was to evaluate marginal bone loss around two types of implants modified at the neck area: Nobel Active and Nobel Replace Groovy, both manufactured by Nobel Biocare.
  
  
  METHODS
  A total of 25 Nobel Active and 21 Nobel Replace Groovy implants were included in the present study. The implants were placed based on the relevant protocol and patient inclusion and exclusion criteria. The amount of bone loss around implants was compared at 6 and 12-month intervals using digital periapical radiographs.
  
  
  RESULTS
  The mean bone loss values in the Nobel Active and Nobel Replace Groovy groups were 0.682 mm and 0.645 mm, respectively, with no statistically significant difference based on the results of independent t-test (P=0.802).
  
  
  CONCLUSIONS
  Use of both implant types yielded favorable results, with high durability. The two implant types exhibited no superiority over each other in terms of bone loss.
authors.affiliation: Professor, Dental Implant Research Center, Periodontics Department, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Amir Reza
authors.initials: AR
authors.lastname: Rokn
authors.affiliation: Dental Implant Research Center, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Samareh
authors.initials: S
authors.lastname: Badri
authors.affiliation: Assistant Professor, Dental Implant Research Center, Periodontics Department, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Amir Alireza
authors.initials: AA
authors.lastname: Rasouli Ghahroudi
authors.affiliation: Dental Implant Research Center, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Rebeca
authors.initials: R
authors.lastname: Manasheof
authors.affiliation: Epidemiologist, Dental Research Center, Dental School, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mohamad Javad
authors.initials: MJ
authors.lastname: Kharazi Fard
authors.affiliation: Dental Implant Research Center, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Hamidreza
authors.initials: H
authors.lastname: Barikani
keywords: Bone loss; Dental implant-abutment design; platform shifting