X0303 4 2010-02-16 0 0001014507 SIRONA DENTAL SYSTEMS, INC. siro 0001181240 HOOD WILLIAM K C/O SIRONA DENTAL SYSTEMS,INC. 30-30 47TH AVE, SUITE 500 LONG ISLAND CITY NY 11101 1 0 0 0 Common Stock 2010-02-16 4 S 0 32787 36.139 D 21246 D The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 17, 2009. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from 36.00 to 36.51, inclusive. The reporting person undertakes to provide Sirona Dental Systems, Inc., any security holder of Sirona Dental Systems, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each seperate price within the ranges set forth in footnote (4) to this Form 4. William K. Hood, by Michael Friedlander, Attorney 2010-02-18