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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001181431-09-039117.txt : 20090812
<SEC-HEADER>0001181431-09-039117.hdr.sgml : 20090812
<ACCEPTANCE-DATETIME>20090812163257
ACCESSION NUMBER:		0001181431-09-039117
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20090810
FILED AS OF DATE:		20090812
DATE AS OF CHANGE:		20090812

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SULLIVAN TIMOTHY P
		CENTRAL INDEX KEY:			0001245970

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-22673
		FILM NUMBER:		091007184

	MAIL ADDRESS:	
		STREET 1:		THREE FIRST NATIONAL PLZ
		STREET 2:		SUITE 3800
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60602

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SIRONA DENTAL SYSTEMS, INC.
		CENTRAL INDEX KEY:			0001014507
		STANDARD INDUSTRIAL CLASSIFICATION:	DENTAL EQUIPMENT & SUPPLIES [3843]
		IRS NUMBER:				113374812
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		30-30 47TH AVE
		STREET 2:		SUITE 500
		CITY:			LONG ISLAND CITY
		STATE:			NY
		ZIP:			11101
		BUSINESS PHONE:		7189375765

	MAIL ADDRESS:	
		STREET 1:		30-30 47TH AVE
		STREET 2:		SUITE 500
		CITY:			LONG ISLAND CITY
		STATE:			NY
		ZIP:			11101

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SCHICK TECHNOLOGIES INC
		DATE OF NAME CHANGE:	19970425
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd250470.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-08-10</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001014507</issuerCik>
        <issuerName>SIRONA DENTAL SYSTEMS, INC.</issuerName>
        <issuerTradingSymbol>SIRO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001245970</rptOwnerCik>
            <rptOwnerName>SULLIVAN TIMOTHY P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O MADISON DEARBORN PARTNERS, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>THREE FIRST NATIONAL PLAZA, SUITE 4600</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60602</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2009-08-10</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1125000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>22.68</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>28347480</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Owned by Sirona Holdings Luxco S.C.A. (&quot;Luxco&quot;).</footnote>
        <footnote id="F2">The following entities may be deemed to have a beneficial interest in the Common Stock held by Luxco: Sirona Holdings S.A. (&quot;Luxco Manager&quot;), by virtue of its being the sole manager of Luxco; MDCP IV Global Investments LP (&quot;MDCP IV Global Investments&quot;), by virtue of its being the controlling shareholder of Luxco Manager; MDP IV Global GP, LP (&quot;MDP IV Global GP&quot;), 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. A majority of the following members of MDP Global Investors Limited have the authority to vote or dispose of the shares held by MDCP IV Global Investments: John A. Canning, Jr., Paul J. Finnegan, Samuel M. Mencoff, Paul R. Wood, (Continued Footnote 3)</footnote>
        <footnote id="F3">Benjamin D. Chereskin, Justin S. Huscher, James N. Perry, Jr., Thomas R. Reusche, Cynthia Reusche, Timothy P. Sullivan, Nicholas W. Alexos, Robin P. Selati, Gary J. Little GST Exempt Marital Trust, David F. Mosher and Thomas Souleles. As a member of MDP Global Investors Limited, Mr. Sullivan may also be deemed to share beneficial ownership of the Common Stock held by Luxco. Mr. Sullivan disclaims beneficial ownership of the shares directly held by Luxco except to the extent of his pecuniary interest therein. Each of the members of MDP Global Investors Limited and each of MDCP IV Global Investments, MDP IV Global GP and MDP Global Investors Limited disclaims beneficial ownership of any shares directly held by Luxco except to the extent of their respective pecuniary interest therein.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Timothy P. Sullivan</signatureName>
        <signatureDate>2009-08-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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