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Objective: This study tries to assess the efficiency of the novel instrument „PerioScan“ (Sirona, Bensheim, PS) in terms of calculus removal when operated at different intensity settings. Additionally, the results obtained were compared to those of the sonicscaler „Sonicflex (KaVo, Biberach, SS) and ultrasonicscaler „Vector Scaler“ (Dürr, Bietigheim-Bissingen, US).
Methods: 75 extracted human teeth which have been stored in a 0,9% NaCl and 0,001% Sodium-azide solution and showed calculus on root surfaces were examined using five methods of treatment in an artificial periodontal pocket model: 15 teeth were treated using PS at 100% intensity, another 15 teeth were cleaned at 70% respectively 50% intensity. The last 30 teeth were partially treated with US and SS at full power. A photo was taken right before each treatment and after instrumenting intervals of five seconds. In this manner calculus surfaces could be measured with a computer program and the specific efficiency in mm2/s was calculated. A Kruskal-Wallis and Mann-Whitney-test was used for statistic analysis.
Results: When being used on highest power settings, the instruments do not show a statistically significant difference (p ≥ 0,07). The mean efficiencies were 0,215 mm2/s (PS 100%), 0,116 mm2/s (PS 70%), 0,046 mm2/s (PS 50%), 0,309 mm2/s (SS) and 0,219 mm2/s (US). When operated at intensities < 100%, PS showed a relevant decrease in efficiency and a notable prolongation of instrumentation-time.
Conclusion: Even if the instruments used in this study show different oscillation-patterns of the working tip, no significant difference could be shown when each instrument was used at full power. The efficiency of treatment with „PerioScan“ is dependent on the selected intensity. The higher the selected intensity is the less time is needed to achieve complete calculus-removal.