A short-term clinical study of marginal bone level change around microthreaded and platformswitched implants

Hee Jung Yun, Jung Chul Park, Jeong Ho Yun, Ui Won Jung, Chang Sung Kim, Seong Ho Choi, Kyoo Sung Cho

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Purpose: 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 platformswitched 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 platformswitched implant system, and that this system is associated with reduced marginal bone loss.

Original languageEnglish
Pages (from-to)211-217
Number of pages7
JournalJournal of Periodontal and Implant Science
Issue number5
Publication statusPublished - 2011 Oct

All Science Journal Classification (ASJC) codes

  • Oral Surgery
  • Periodontics


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