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Journal of Biomedical Optics • Open Access

Evaluation of the marginal fit at implant–abutment interface by optical coherence tomography
Author(s): Keisuke Kikuchi; Norihisa Akiba; Alireza Sadr; Yasunori Sumi; Junji Tagami; Shunsuke Minakuchi

Paper Abstract

Vertical misfit of implant–abutment interface can affect the success of implant treatment; however, currently available modalities have limitations to detect these gaps. This study aimed to evaluate implant–abutment gaps <italic<in vitro</italic< using optical coherence tomography (OCT). Vertical misfit gaps sized 50, 100, 150, or 200 <italic<μ</italic<m were created between external hexagonal implants and titanium abutments (Nobel Biocare, Göteborg, Sweden). A porcine gingival tissue slice, 0.5, 1.0, 1.5, or 2.0 mm in thickness, was placed on each implant–abutment interface. The gaps were evaluated by swept-source OCT at a center wavelength of 1330 nm (Panasonic Healthcare, Ehime, Japan) with beam angles of 90, 75 and 60 deg to the implant long-axis. The results suggested that while the measurements were precise, gap size and gingival thickness affected the sensitivity of detection. Gaps sized 100 <italic<μ</italic<m and above could be detected with good accuracy under 0.5- or 1.0-mm-thick gingiva (GN). Around 70% of gaps sized 150 <italic<μ</italic<m and above could be detected under 1.5-mm-thick GN. On the other hand, 80% of gaps under 2.0-mm-thick GN were not detected due to attenuation of near-infrared light through the soft tissue. OCT appeared as an effective tool for evaluating the misfit of implant–abutment under thin layers of soft tissue.

Paper Details

Date Published: 7 May 2014
PDF: 7 pages
J. Biomed. Opt. 19(5) 055002 doi: 10.1117/1.JBO.19.5.055002
Published in: Journal of Biomedical Optics Volume 19, Issue 5
Show Author Affiliations
Keisuke Kikuchi, Tokyo Medical and Dental Univ. (Japan)
Norihisa Akiba, Tokyo Medical and Dental Univ. (Japan)
Alireza Sadr, Tokyo Medical and Dental Univ. (Japan)
Yasunori Sumi, National Ctr. for Geriatrics and Gerontology (Japan)
Junji Tagami, Tokyo Medical and Dental Univ. (Japan)
Shunsuke Minakuchi, Tokyo Medical and Dental Uniiv. (Japan)


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