X0202 4 2006-06-20 0 0001014507 SIRONA DENTAL SYSTEMS, INC. SIRO 0001339571 Sirona Holdings Luxco S.C.A. 8-10, RUE MATHIAS HARDT L-1717 N4 NONE LUXEMBOURG 0 0 1 0 0001340524 Sirona Holdings S.A. 10, RUE HENRI M. SCHNADT L-2530 N4 NONE LUXEMBOURG 0 0 1 0 Sole manager of 10% holder 0001340528 MDCP IV Global Investments LP C/O WALKERS SPV LIMITED, WALKER HOUSE PO BOX 908GT, MARY STREET GEORGE TOWN, GRAND CAYMAN E9 NONE CAYMAN ISLANDS 0 0 1 0 Primary shareholder of manager 0001340526 MDCP IV Global GP, LP C/O WALKERS SPV LIMITED, WALKER HOUSE PO BOX 908GT, MARY STREET GEORGE TOWN, GRAND CAYMAN E9 NONE CAYMAN ISLANDS 0 0 1 0 Indirect GP of 10% owner 0001340527 MDP Global Investors LTD C/O WALKERS SPV LIMITED, WALKER HOUSE PO BOX 908GT, MARY STREET GEORGE TOWN, GRAND CAYMAN E9 NONE CAYMAN ISLANDS 0 0 1 0 Indirect GP of 10% owner Common Stock 2006-06-20 4 P 0 36972480 A 36972480 I See Footnote Sirona Dental Systems, Inc. issued 36,972,480 shares of its Common Stock to Sirona Holdings Luxco S.C.A. ("Luxco") in exchange for 100% of the issued and outstanding share capital of Sirona Holding GmbH ("Sirona") and a Promissory Note issued June 30, 2005 by Sirona to Luxco in the original principal amount of <euro>150,992,464. Owned by Luxco. The following entities may be deemed to have a beneficial interest in the Common Stock held by Luxco. Sirona Holdings S.A. ("Luxco Manager"), by virtue of its being the sole manager of Luxco; MDCP IV Global Investments LP ("MDCP IV Global Investments"), by virtue of its being the controlling shareholder of Luxco Manager; MDP IV Global GP, LP ("MDP IV Global GP"), by virtue of its being the sole general partner of MDCP IV Global Investments and MDP Global Investors Limited by virtue of its being the sole general partner of MDP IV Global GP. Sirona Holdings Luxco S.C.A., by Sirona Holdings S.A., its Manager, by /s/ Timothy Sullivan, its ''A'' Director 2006-06-21 Sirona Holdings S.A., by /s/ Timothy Sullivan, its ''A'' Director 2006-06-21 MDCP IV Global Investments LP, by MDP IV Global GP, LP, its General Partner, by MDP Global Investors Limited, its General Partner, by /s/ Timothy Sullivan, its Managing Director 2006-06-21 MDP IV Global GP, LP, by MDP Global Investors Limited, its General Partner, by /s/ Timothy Sullivan, its Managing Director 2006-06-21 MDP Global Investors Limited, by /s/ Timothy Sullivan, its Managing Director 2006-06-21