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We compared the range and percentage of paint removed by air scaler,in subgingival scaling and root planing with curettes using a teaching model. The roots of removable teeth were uniformly coated with a paint layer and the model attached to a mannequin. Mechanical instrumentation was performed using the SONICflex LUX2000L(Kavo EWL, Germany)air scaler with a SONICflex paro tip compared to Gracy curettes(Mini-five ,Hu-Friedy,U. S.A.). Teeth examined were lower left,right central,and lateral incisors,upper left first premolar,and lower left second molar. Subjects were20operators equally divided into an amateur group(<1year of periodontal practice)and a professional group(>―8years of periodontal practice). Instrumented areas were analyzed to assess the range and percentage of paint removed by a computerized image analysis and compared for2types of instrumentation and 2operator’s groups. In the amateur group,the range reached by the air scaler was deeper than that of the curette for almost all aspects of examined teeth and among professionals,deeper for all aspects. The lingual aspect of the upper left first premolar and the distal aspect of the lower left second molarwas significant(p<0.01). The percentage of paint removed by curettes was the same and/or greater than that by the air scaler in both groups on lower incisors and the upper left premolar. However,on the lower left second molar,the percentage of paint removed by the air scaler was greater than that by curettes. The distal aspect in the 20

Range and Percentage of Paint Removed by Air Scaler in Subgingival Scaling and Root Planing Using a Teaching Model vs Curettes