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Proc-Type: 2001,MIC-CLEAR
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<SEC-DOCUMENT>0001181431-05-059341.txt : 20051103
<SEC-HEADER>0001181431-05-059341.hdr.sgml : 20051103
<ACCEPTANCE-DATETIME>20051103100819
ACCESSION NUMBER:		0001181431-05-059341
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20051101
FILED AS OF DATE:		20051103
DATE AS OF CHANGE:		20051103

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AMERICAN DENTAL PARTNERS INC
		CENTRAL INDEX KEY:			0001028087
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-MISC HEALTH & ALLIED SERVICES, NEC [8090]
		IRS NUMBER:				043297858
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		201 EDGEWATER DRIVE
		STREET 2:		SUITE 285
		CITY:			WAKEFIELD
		STATE:			MA
		ZIP:			01880-1249
		BUSINESS PHONE:		781-224-0880

	MAIL ADDRESS:	
		STREET 1:		201 EDGEWATER DRIVE
		STREET 2:		SUITE 285
		CITY:			WAKEFIELD
		STATE:			MA
		ZIP:			01880

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SERRAO GREGORY A
		CENTRAL INDEX KEY:			0001234983

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-23363
		FILM NUMBER:		051175349

	BUSINESS ADDRESS:	
		STREET 1:		201 EDGEWATER DRIVE
		CITY:			WAKEFIELD
		STATE:			MA
		ZIP:			01880
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd96004.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-11-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001028087</issuerCik>
        <issuerName>AMERICAN DENTAL PARTNERS INC</issuerName>
        <issuerTradingSymbol>ADPI</issuerTradingSymbol>
    </issuer>

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            <rptOwnerName>SERRAO GREGORY A</rptOwnerName>
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        <reportingOwnerAddress>
            <rptOwnerStreet1>201 EDGEWATER DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WAKEFIELD</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01880</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Executive Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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            <transactionCoding>
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                <transactionCode>M</transactionCode>
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            <transactionAmounts>
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                <transactionShares>
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                <transactionPricePerShare>
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                <sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-11-02</value>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>10000</value>
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                <transactionPricePerShare>
                    <value>4.63</value>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
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        <nonDerivativeTransaction>
            <securityTitle>
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            <transactionDate>
                <value>2005-11-02</value>
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                <transactionFormType>4</transactionFormType>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
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            <transactionAmounts>
                <transactionShares>
                    <value>1500</value>
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                <transactionPricePerShare>
                    <value>21.175</value>
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                <footnoteId id="F3"/>
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            <transactionAmounts>
                <transactionShares>
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                    <footnoteId id="F1"/>
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                <transactionPricePerShare>
                    <value>0</value>
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            <ownershipNature>
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        <derivativeTransaction>
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        <derivativeTransaction>
            <securityTitle>
                <value>Nonqualified option granted 11/08/2000 (right to buy)</value>
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                <value>4.75</value>
                <footnoteId id="F3"/>
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                <value>2005-11-02</value>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
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            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>30000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
                <value>2001-11-08</value>
                <footnoteId id="F5"/>
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            <expirationDate>
                <value>2010-11-08</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>30000</value>
                    <footnoteId id="F1"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>480884</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Number of shares reflects the 3-for-2 stock split effected by the issuer in October 2005.</footnote>
        <footnote id="F2">Does not include 50,922 shares of common stock held indirectly by reporting person through joint ownership with spouse, through other members of immediately family, and through a trust for the benefit of members of immediate family.</footnote>
        <footnote id="F3">Conversion or exercise price reflects the 3-for-2 stock split effected by the issuer in October 2005.</footnote>
        <footnote id="F4">Total number of derivative securities beneficially owned (480,884) reflects all options held by reporting person pursuant to employee benefit plans of issuer.</footnote>
        <footnote id="F5">Option vested with respect to 25% of shares subject to option on each of the first four anniversaries of the date of grant.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Mark W. Vargo, Attorney-in-Fact and Agent</signatureName>
        <signatureDate>2005-11-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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