The effect of internal versus external abutment connection modes on crestal bone changes around dental implants: A radiographic analysis

Ki Tae Koo, Eun Jeong Lee, Jae Yoon Kim, Yang Jo Seol, Jung Suk Han, Tae Il Kim, Yong Moo Lee, Young Ku, Ulf M E Wikesjö, In Chul Rhyu

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43 Scopus citations

Abstract

Background: To the best of our knowledge, the influence of external versus internal implant-abutment connections on crestal bone remodeling has not been reported. The aim of the present study is to investigate the influence of the abutment connection on peri-implant crestal bone levels (CBLs) using radiographic recordings. Methods: Radiographic recordings from 40 single-tooth implants (20 external and 20 internal octagonal connections; one implant/patient) in 40 patients (15 males and 25 females; mean age: 54.3 years) were selected for analyses. The radiographic evaluation included the following: 1) linear bone change (LBC); 2) dimensional change (DC); and 3) angle between the implant and adjacent bone (AIB). Differences in LBC, DC, and AIB between implant placement and 1 year after loading for each system were evaluated using a paired ttest. Comparison of LBC, DC, and AIB between systems at 1 year after loading was done using analysis of covariance. The significance level was set at P≤0.05. Results: Radiographic CBLs (LBCs) were reduced at 1 year after loading compared to those at implant placement to reach statistical significance for the external connection (P= 0.000) but not the internal connection (P= 0.939). CBL changes were significantly greater for the external compared to the internal connection (P= 0.000). Similarly, the DC for the external connection was significantly greater compared to that for the internal connection (P= 0.004). Conclusion: Within the limitations of this study, the implant-abutment connection technology appears to have a significant impact on peri-implant CBLs, with the external connection paralleled by a significant reduction of CBLs.

Original languageEnglish (US)
Pages (from-to)1104-1109
Number of pages6
JournalJournal of periodontology
Volume83
Issue number9
DOIs
StatePublished - Sep 1 2012

Keywords

  • Alveolar bone loss
  • Dental abutments
  • Dental implants

ASJC Scopus subject areas

  • Periodontics

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    Koo, K. T., Lee, E. J., Kim, J. Y., Seol, Y. J., Han, J. S., Kim, T. I., Lee, Y. M., Ku, Y., Wikesjö, U. M. E., & Rhyu, I. C. (2012). The effect of internal versus external abutment connection modes on crestal bone changes around dental implants: A radiographic analysis. Journal of periodontology, 83(9), 1104-1109. https://doi.org/10.1902/jop.2011.110456