title: A short-term clinical study of marginal bone level change around microthreaded and platform-switched implants.
abstract: OBJECTIVE
  The marginal bone levels around implants following restoration are used as a reference for evaluating implant success and survival. Two design concepts that can reduce crestal bone resorption are the microthread and platform-switching concepts. The aims of this study were to analyze the placement of microthreaded and platform-switched implants and their short-term survival rate, as well as the level of bone around the implants.
  
  
  METHODS
  The subjects of this study were 27 patients (79 implants) undergoing treatment with microthreaded and platform-switched implants between October 2008 and July 2009 in the Dental Hospital of Yonsei University Department of Periodontology. The patients received follow-up care more than 6 months after the final setting of the prosthesis, at which time periapical radiographs were taken. The marginal bone level was measured from the reference point to the lowest observed point of contact between the marginal bone and the fixture. Comparisons were made between radiographs taken at the time of fixture installation and those taken at the follow-up visit.
  
  
  RESULTS
  During the study period (average of 11.8 months after fixture installation and 7.4 months after the prosthesis delivery), the short-term survival rate of microthreaded and platform-switched implants was 100% and the marginal bone loss around implants was 0.16±0.08 mm, the latter of which is lower than the previously reported values.
  
  
  CONCLUSIONS
  This short-term clinical study has demonstrated the successful survival rates of a microthread and platform-switched implant system, and that this system is associated with reduced marginal bone loss.
authors.affiliation: Department of Periodontology, Yonsei University College of Dentistry, Seoul, Korea.
authors.forename: Hee-Jung
authors.initials: HJ
authors.lastname: Yun
authors.forename: Jung-Chul
authors.initials: JC
authors.lastname: Park
authors.forename: Jeong-Ho
authors.initials: JH
authors.lastname: Yun
authors.forename: Ui-Won
authors.initials: UW
authors.lastname: Jung
authors.forename: Chang-Sung
authors.initials: CS
authors.lastname: Kim
authors.forename: Seong-Ho
authors.initials: SH
authors.lastname: Choi
authors.forename: Kyoo-Sung
authors.initials: KS
authors.lastname: Cho
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