Elaboration on X-ray imaging techniques to capture errors in impression taking for internal implant

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  • エックス線を用いたインターナルインプラント印象時の誤差に関する検討

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Abstract

<p>The accuracy of the fit of the superstructure is important for the long-term maintenance and stability of implant prosthetics. We carried out an X-ray study to investigate errors in impression taking of implant superstructures in order to obtain highly accurate impressions for fabrication of implant prostheses. To measure the error in implant impressions using digital X-rays, we made models fixed to a plastic plate with an artificial gap of 50 µm and 100 µm thick strips between the impression coping and the implant fixture and that without the artificial gap. These models were scanned at angles ranging from 0°-25° in the horizontal direction with respect to the platform. Charge-coupled device (CCD) and imaging plate (IP) sensors were used for comparison. The CCD images tended to be superior to the IP images in terms of the visualization limit. On the IP images, there was no major change in the proportion of reviewers who overlooked the presence of a gap in accordance with different angles of irradiation. The CCD tended to perform better than the IP at irradiation angles of 15° or less, but the IP tended to perform better at irradiation angles of 20° or more. It is important to check the fit between the implant fixture and the abutment using X-rays from the correct irradiation angle to reduce the error. </p>

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