Sec Form 4 Filing - HOOD WILLIAM K @ SIRONA DENTAL SYSTEMS, INC. - 2016-02-29

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person HOOD WILLIAM K 2. Issuer Name and Ticker or Trading Symbol SIRONA DENTAL SYSTEMS, INC. [ SIRO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O SIRONA DENTAL SYSTEMS, INC., 30-30 47TH AVENUE, SUITE 500 3. Date of Earliest Transaction (MM/DD/YY) 02/29/2016 (Street) LONG ISLAND CITY, NY11101 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 02/29/2016 D 30,448 ( 1 ) D 0 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Option (right to buy) $ 42.5 ( 4 ) 02/29/2016 D 15,000 ( 5 ) ( 6 ) ( 7 ) Common Stock 15,000 $ 0 0 D Option (right to buy) $ 31.15 ( 4 ) 02/29/2016 D 15,000 ( 5 ) ( 6 ) ( 7 ) Common Stock 15,000 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other HOOD WILLIAM K C/O SIRONA DENTAL SYSTEMS, INC. 30-30 47TH AVENUE, SUITE 500 LONG ISLAND CITY, NY11101 X Signatures /s/ Michael Friedlander, Attorney-in-Fact for William K. Hood 03/01/2016 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Includes 3,860 restricted stock units ("RSU"). Pursuant to the Merger Agreement (as defined below) and a resolution of Sirona's board of directors, the RSUs accelerated and vested in full at the effective time of the Merger (as defined below). ( 2 )On February 29, 2016, pursuant to an Agreement and Plan of Merger, dated as of September 15, 2015 (the "Merger Agreement"), by and among Sirona Dental Systems, Inc. ("Sirona"), DENTSPLY International Inc. ("DENTSPLY") and Dawkins Merger Sub Inc., a wholly owned subsidiary of DENTSPLY ("Merger Sub"), Merger Sub merged with and into Sirona, with Sirona continuing as the surviving entity and a wholly owned subsidiary of DENTSPLY (the "Merger"). Upon completion of the Merger, DENTSPLY changed its corporate name to "DENTSPLY SIRONA Inc." ( 3 )Disposed of pursuant to the Merger Agreement in which each share of Sirona common stock issued and outstanding immediately prior to the consummation of the Merger was converted into 1.8142 shares of DENTSPLY common stock, rounded down to the nearest whole share. ( 4 )The exercise price per share of each converted Sirona stock option will be determined by dividing the per share exercise price of such stock option by the 1.8142 exchange ratio, and rounding up to the nearest whole cent. ( 5 )Disposed of pursuant to the Merger Agreement in which each outstanding and unexercised option to acquire shares of Sirona common stock, whether or not vested or exercisable, was assumed by DENTSPLY and was converted into an option to acquire shares of DENTSPLY common stock on the same terms and conditions as were in effect immediately prior to the completion of the Merger based on the 1.8142 exchange ratio, rounded down to the nearest whole share. ( 6 )This option is fully vested and exercisable. ( 7 )This option grant shall terminate within 90 days of the date hereof.

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