Kurzfassung

After positive approval of IRB, 50 patients were selected by the following inclusion criterions: no restorations, fillings, increased tooth sensivity or internal/external tooth structure anomalies. After the initial professional tooth cleaning the patients were individually instructed to apply the external tooth-whitening agent Perfect Bleach 16 % (VOCO GmbH, Cuxhaven, Germany) for 7 day and 2 hours a day. The shade determination was performed 4 times with a spectrophotometric device (VITA...After positive approval of IRB, 50 patients were selected by the following inclusion criterions: no restorations, fillings, increased tooth sensivity or internal/external tooth structure anomalies. After the initial professional tooth cleaning the patients were individually instructed to apply the external tooth-whitening agent Perfect Bleach 16 % ® (VOCO GmbH, Cuxhaven, Germany) for 7 day and 2 hours a day. The shade determination was performed 4 times with a spectrophotometric device (VITA easyshade advanced, VITA Zahnfabrik, Bad Säckingen, Germany); baseline (t0), after bleaching (t1), after two weeks (t2), after four weeks (t3). The color differences, as well as the differences of the coordinates (ΔE, ΔL, Δh, Δa, Δb) were calculated.
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