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Issue: 03/2017 - Max Seidemann - Rainer Haak - Constanze Olms
A pilot study for evaluating interfaces by OCT: loading of a Resin Nano Ceramic on one-piece ZrO2 implants

Introduction: The prosthetic treatment of one-piece ZrO2 implants is a challenge because of the scarce long-term data available. In order to achieve a physiological rehabilitation on rigid, one-piece implant systems, a certain resilience is desired according to the natural tooth. The best way to achieve this, is with the restoration and asuitable bonding procedure to secure a stable and durable bond. The aim of this study was to visualize changes at interfaces before and after dynamic loading of adhesively bonded Resin Nano Ceramic (RNC) crowns on one-piece ZrO2 implants by optical coherence tomography (OCT).

Material and Method: A total of 20 one-piece ZrO2 trialimplants were produced and 20crowns from LAVA Ultimate (LU, 3M ESPE, Seefeld, Germany) were made using CAD/CAM procedures. After tribochemical pretreatment (SB) of all crowns, as well as half of the implant abutments (CoJet, 30?m, 2bar), the crowns were bonded to the implants with Scotchbond Universal (SU) and RelyX Ultimate (RU) according to the manufacturer’s instructions. Subsequently, OCT images (Telesto II, Thorlabs GmbH) ofthe attached crowns were recorded before and after chewing simulation (CS, 1.2million cycles with 50N at 5–55 °C for 60sec each, SD Mechatronik GmbH). The changes in the signal lines visible in the OCT-B scans wereassessed visually as “indistinct”, “equal” or “more pronounced”.

Results: An evaluation of the visible changes to the signal lines in the OCT-B scan was performed according to a visual classification into “indistinct”, “equal” or “more pronounced”. For all samples in the OCT-B scan a signal was visible along the SU+RU/ZrO2 interface not only before, but also after the CS. This signal was “more pronounced” for non-SB before CS than for samples that received pretreatment (SB). The signal intensity on the SU+RU/ZrO2 interface did not increase after CS for non-SB, whereas in SB samples it was “more pronounced”. In the occlusal B-scans, a second signal line was visible only in non-SB test samples after dynamic loading.

Conclusion: The pilot study shows that non-invasive imaging of changes in RNC interfaces by OCT is possible and thereby additional visual information on the bond can be attained.

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