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      <TotalReportableCompFromOrg>569285</TotalReportableCompFromOrg>
      <TotalReportableCompFrmRltdOrgs>0</TotalReportableCompFrmRltdOrgs>
      <TotalOtherCompensation>55987</TotalOtherCompensation>
      <NumberIndividualsGT100K>3</NumberIndividualsGT100K>
      <FormersListed>0</FormersListed>
      <TotalCompGT150K>1</TotalCompGT150K>
      <CompensationFromOtherSources>0</CompensationFromOtherSources>
      <ContractorCompensation>
        <NameOfContractor>
          <NameBusiness>
            <BusinessNameLine1>Massachusetts Convention Center</BusinessNameLine1>
          </NameBusiness>
        </NameOfContractor>
        <AddressOfContractor>
          <AddressUS>
            <AddressLine1>415 Summer Street</AddressLine1>
            <City>BOSTON</City>
            <State>MA</State>
            <ZIPCode>02210</ZIPCode>
          </AddressUS>
        </AddressOfContractor>
        <DescriptionOfServices>Convention &amp; Exhibits Services</DescriptionOfServices>
        <Compensation>367987</Compensation>
      </ContractorCompensation>
      <ContractorCompensation>
        <NameOfContractor>
          <NameBusiness>
            <BusinessNameLine1>Aramark Corporation</BusinessNameLine1>
          </NameBusiness>
        </NameOfContractor>
        <AddressOfContractor>
          <AddressUS>
            <AddressLine1>415 Summer Street</AddressLine1>
            <City>BOSTON</City>
            <State>MA</State>
            <ZIPCode>02210</ZIPCode>
          </AddressUS>
        </AddressOfContractor>
        <DescriptionOfServices>Catering Services</DescriptionOfServices>
        <Compensation>270915</Compensation>
      </ContractorCompensation>
      <ContractorCompensation>
        <NameOfContractor>
          <NameBusiness>
            <BusinessNameLine1>Bowditch &amp; Dewey</BusinessNameLine1>
          </NameBusiness>
        </NameOfContractor>
        <AddressOfContractor>
          <AddressUS>
            <AddressLine1>175 Crossing Boulevard Suite 500</AddressLine1>
            <City>FRAMINGHAM</City>
            <State>MA</State>
            <ZIPCode>01792</ZIPCode>
          </AddressUS>
        </AddressOfContractor>
        <DescriptionOfServices>Legal Services</DescriptionOfServices>
        <Compensation>208386</Compensation>
      </ContractorCompensation>
      <ContractorCompensation>
        <NameOfContractor>
          <NameBusiness>
            <BusinessNameLine1>Convention Data Services</BusinessNameLine1>
          </NameBusiness>
        </NameOfContractor>
        <AddressOfContractor>
          <AddressUS>
            <AddressLine1>1077 Waterhouse Road</AddressLine1>
            <City>BOURNE</City>
            <State>MA</State>
            <ZIPCode>02532</ZIPCode>
          </AddressUS>
        </AddressOfContractor>
        <DescriptionOfServices>Convention - Registration Services</DescriptionOfServices>
        <Compensation>137091</Compensation>
      </ContractorCompensation>
      <ContractorCompensation>
        <NameOfContractor>
          <NameBusiness>
            <BusinessNameLine1>Capitol Consulting Group</BusinessNameLine1>
          </NameBusiness>
        </NameOfContractor>
        <AddressOfContractor>
          <AddressUS>
            <AddressLine1>One Beacon St Ste 1320</AddressLine1>
            <City>BOSTON</City>
            <State>MA</State>
            <ZIPCode>02108</ZIPCode>
          </AddressUS>
        </AddressOfContractor>
        <DescriptionOfServices>Consulting</DescriptionOfServices>
        <Compensation>120000</Compensation>
      </ContractorCompensation>
      <NumberOfContractorsGT100K>5</NumberOfContractorsGT100K>
      <ProgramServiceRevenue>
        <Description>Yankee Dental Congress</Description>
        <BusinessCode>900099</BusinessCode>
        <TotalRevenueColumn>6503396</TotalRevenueColumn>
        <ExclusionAmount>6503396</ExclusionAmount>
      </ProgramServiceRevenue>
      <ProgramServiceRevenue>
        <Description>Membership Dues</Description>
        <BusinessCode>900099</BusinessCode>
        <TotalRevenueColumn>1858081</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>1858081</RelatedOrExemptFunctionIncome>
      </ProgramServiceRevenue>
      <ProgramServiceRevenue>
        <Description>Conferences and Workho</Description>
        <BusinessCode>900099</BusinessCode>
        <TotalRevenueColumn>309290</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>309290</RelatedOrExemptFunctionIncome>
      </ProgramServiceRevenue>
      <ProgramServiceRevenue>
        <Description>Continuing education</Description>
        <BusinessCode>900099</BusinessCode>
        <TotalRevenueColumn>244695</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>244695</RelatedOrExemptFunctionIncome>
      </ProgramServiceRevenue>
      <ProgramServiceRevenue>
        <Description>Advertising</Description>
        <BusinessCode>541800</BusinessCode>
        <TotalRevenueColumn>147075</TotalRevenueColumn>
        <UnrelatedBusinessRevenue>147075</UnrelatedBusinessRevenue>
      </ProgramServiceRevenue>
      <TotalProgramServiceRevenue>9062537</TotalProgramServiceRevenue>
      <InvestmentIncome>
        <TotalRevenueColumn>271865</TotalRevenueColumn>
        <ExclusionAmount>271865</ExclusionAmount>
      </InvestmentIncome>
      <RoyaltiesRevenue>
        <TotalRevenueColumn>250510</TotalRevenueColumn>
        <ExclusionAmount>250510</ExclusionAmount>
      </RoyaltiesRevenue>
      <GrossRents>
        <Real>427046</Real>
      </GrossRents>
      <LessRentalExpenses>
        <Real>627523</Real>
      </LessRentalExpenses>
      <RentalIncomeOrLoss>
        <Real>-200477</Real>
      </RentalIncomeOrLoss>
      <NetRentalIncomeOrLoss>
        <TotalRevenueColumn>-200477</TotalRevenueColumn>
        <UnrelatedBusinessRevenue>-200477</UnrelatedBusinessRevenue>
      </NetRentalIncomeOrLoss>
      <GrossAmountSalesAssets>
        <Securities>4648202</Securities>
      </GrossAmountSalesAssets>
      <LessCostOthBasisSalesExpenses>
        <Securities>5325295</Securities>
      </LessCostOthBasisSalesExpenses>
      <GainOrLoss>
        <Securities>-677093</Securities>
      </GainOrLoss>
      <NetGainOrLossInvestments>
        <TotalRevenueColumn>-677093</TotalRevenueColumn>
        <ExclusionAmount>-677093</ExclusionAmount>
      </NetGainOrLossInvestments>
      <OtherRevenueMisc>
        <Description>equity in wholly owned</Description>
        <BusinessCode>900099</BusinessCode>
        <TotalRevenueColumn>102126</TotalRevenueColumn>
        <ExclusionAmount>102126</ExclusionAmount>
      </OtherRevenueMisc>
      <OtherRevenueMisc>
        <Description>Management fee</Description>
        <BusinessCode>900099</BusinessCode>
        <TotalRevenueColumn>10000</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>10000</RelatedOrExemptFunctionIncome>
      </OtherRevenueMisc>
      <MiscellaneousRevenue>
        <TotalRevenueColumn>38106</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>38106</RelatedOrExemptFunctionIncome>
      </MiscellaneousRevenue>
      <TotalOtherRevenue>150232</TotalOtherRevenue>
      <TotalRevenue>
        <TotalRevenueColumn>8857574</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>2460172</RelatedOrExemptFunctionIncome>
        <UnrelatedBusinessRevenue>-53402</UnrelatedBusinessRevenue>
        <ExclusionAmount>6450804</ExclusionAmount>
      </TotalRevenue>
      <GrantsToDomesticOrgs>
        <Total>81992</Total>
      </GrantsToDomesticOrgs>
      <CompCurrentOfficersDirectors>
        <Total>487537</Total>
      </CompCurrentOfficersDirectors>
      <OtherSalariesAndWages>
        <Total>2132488</Total>
      </OtherSalariesAndWages>
      <PensionPlanContributions>
        <Total>150572</Total>
      </PensionPlanContributions>
      <OtherEmployeeBenefits>
        <Total>221062</Total>
      </OtherEmployeeBenefits>
      <PayrollTaxes>
        <Total>215551</Total>
      </PayrollTaxes>
      <FeesForServicesLegal>
        <Total>303105</Total>
      </FeesForServicesLegal>
      <FeesForServicesAccounting>
        <Total>47778</Total>
      </FeesForServicesAccounting>
      <OfficeExpenses>
        <Total>321797</Total>
      </OfficeExpenses>
      <Occupancy>
        <Total>126968</Total>
      </Occupancy>
      <Travel>
        <Total>28221</Total>
      </Travel>
      <ConferencesMeetings>
        <Total>2803723</Total>
      </ConferencesMeetings>
      <Interest>
        <Total>146746</Total>
      </Interest>
      <DepreciationDepletion>
        <Total>178596</Total>
      </DepreciationDepletion>
      <Insurance>
        <Total>38003</Total>
      </Insurance>
      <OtherExpenses>
        <Description>Initiatives</Description>
        <Total>559947</Total>
      </OtherExpenses>
      <OtherExpenses>
        <Description>Delegates Meetings</Description>
        <Total>451963</Total>
      </OtherExpenses>
      <OtherExpenses>
        <Description>Public Awareness Progra</Description>
        <Total>276818</Total>
      </OtherExpenses>
      <OtherExpenses>
        <Description>Bank Fees</Description>
        <Total>182927</Total>
      </OtherExpenses>
      <OtherExpenses>
        <Description>Trustee and Trustee Rel</Description>
        <Total>138017</Total>
      </OtherExpenses>
      <AllOtherExpenses>
        <Total>606556</Total>
      </AllOtherExpenses>
      <TotalFunctionalExpenses>
        <Total>9500367</Total>
      </TotalFunctionalExpenses>
      <CashNonInterestBearing>
        <BOY>2110668</BOY>
        <EOY>1786865</EOY>
      </CashNonInterestBearing>
      <SavingsAndTempCashInvestments>
        <EOY>1197582</EOY>
      </SavingsAndTempCashInvestments>
      <AccountsReceivable>
        <BOY>251823</BOY>
        <EOY>226198</EOY>
      </AccountsReceivable>
      <PrepaidExpensesDeferredCharges>
        <BOY>252584</BOY>
        <EOY>264926</EOY>
      </PrepaidExpensesDeferredCharges>
      <LandBuildingsEquipmentBasis>7531206</LandBuildingsEquipmentBasis>
      <LandBldgEquipmentAccumDeprec>1762712</LandBldgEquipmentAccumDeprec>
      <LandBuildingsEquipmentBasisNet>
        <BOY>5795514</BOY>
        <EOY>5768494</EOY>
      </LandBuildingsEquipmentBasisNet>
      <InvestmentsPubTradedSecurities>
        <BOY>5415825</BOY>
        <EOY>5092953</EOY>
      </InvestmentsPubTradedSecurities>
      <InvestmentsOtherSecurities>
        <EOY>232769</EOY>
      </InvestmentsOtherSecurities>
      <TotalAssets>
        <BOY>13826414</BOY>
        <EOY>14569787</EOY>
      </TotalAssets>
      <AccountsPayableAccruedExpenses>
        <BOY>1049671</BOY>
        <EOY>602478</EOY>
      </AccountsPayableAccruedExpenses>
      <DeferredRevenue>
        <BOY>2004563</BOY>
        <EOY>1885208</EOY>
      </DeferredRevenue>
      <MortNotesPyblSecuredInvestProp>
        <BOY>4783553</BOY>
        <EOY>4712827</EOY>
      </MortNotesPyblSecuredInvestProp>
      <OtherLiabilities>
        <BOY>27842</BOY>
        <EOY>695664</EOY>
      </OtherLiabilities>
      <TotalLiabilities>
        <BOY>7865629</BOY>
        <EOY>7896177</EOY>
      </TotalLiabilities>
      <FollowSFAS117>X</FollowSFAS117>
      <UnrestrictedNetAssets>
        <BOY>5457472</BOY>
        <EOY>6673610</EOY>
      </UnrestrictedNetAssets>
      <TemporarilyRestrictedNetAssets>
        <BOY>503313</BOY>
        <EOY>0</EOY>
      </TemporarilyRestrictedNetAssets>
      <TotalNetAssetsFundBalances>
        <BOY>5960785</BOY>
        <EOY>6673610</EOY>
      </TotalNetAssetsFundBalances>
      <TotalLiabNetAssetsFundBalances>
        <BOY>13826414</BOY>
        <EOY>14569787</EOY>
      </TotalLiabNetAssetsFundBalances>
      <MethodOfAccountingAccrual>X</MethodOfAccountingAccrual>
      <AccountantCompileOrReview>0</AccountantCompileOrReview>
      <FSAudited>1</FSAudited>
      <AuditCommittee>1</AuditCommittee>
      <FinancialStatementConsolidated>X</FinancialStatementConsolidated>
      <FederalGrantAuditRequired>0</FederalGrantAuditRequired>
    </IRS990>
    <IRS990ScheduleC documentId="RetDoc1039700001">
      <SubstantiallyAllDuesNondeduct>0</SubstantiallyAllDuesNondeduct>
      <OnlyInHouseLobbying>0</OnlyInHouseLobbying>
      <AgreeToCarryoverPriorYear>0</AgreeToCarryoverPriorYear>
      <DuesAssessments>1858081</DuesAssessments>
      <NonDedLobbyPoliticalCurrent>384739</NonDedLobbyPoliticalCurrent>
      <NonDedLobbyPoliticalTotal>384739</NonDedLobbyPoliticalTotal>
      <AggrAmtReportedInDuesNotices>572288</AggrAmtReportedInDuesNotices>
      <TaxableAmount>-187549</TaxableAmount>
    </IRS990ScheduleC>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <Land>
        <OtherCostOrOtherBasis>925873</OtherCostOrOtherBasis>
        <BookValue>925873</BookValue>
      </Land>
      <Buildings>
        <OtherCostOrOtherBasis>5115489</OtherCostOrOtherBasis>
        <Depreciation>805392</Depreciation>
        <BookValue>4310097</BookValue>
      </Buildings>
      <LeaseholdImprovements>
        <OtherCostOrOtherBasis>375943</OtherCostOrOtherBasis>
        <Depreciation>94636</Depreciation>
        <BookValue>281307</BookValue>
      </LeaseholdImprovements>
      <Equipment>
        <OtherCostOrOtherBasis>712498</OtherCostOrOtherBasis>
        <Depreciation>571151</Depreciation>
        <BookValue>141347</BookValue>
      </Equipment>
      <OtherLandBuildings>
        <OtherCostOrOtherBasis>401403</OtherCostOrOtherBasis>
        <Depreciation>291533</Depreciation>
        <BookValue>109870</BookValue>
      </OtherLandBuildings>
      <TotalOfBookValueLandBuildings>5768494</TotalOfBookValueLandBuildings>
      <OtherLiabilities>
        <Description>Customer Deposits</Description>
        <Amount>51030</Amount>
      </OtherLiabilities>
      <OtherLiabilities>
        <Description>Miscellaneous</Description>
        <Amount>43782</Amount>
      </OtherLiabilities>
      <OtherLiabilities>
        <Description>Due to (from)</Description>
        <Amount>600852</Amount>
      </OtherLiabilities>
      <TotalOfAmounts>695664</TotalOfAmounts>
    </IRS990ScheduleD>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <RecordsMaintained>1</RecordsMaintained>
      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>MOUNT WACHUSETT COMMUNITY COLLEGE</BusinessNameLine1>
        </RecipientNameBusiness>
        <AddressUS>
          <AddressLine1>444 GREEN STREET</AddressLine1>
          <City>GARDNER</City>
          <State>MA</State>
          <ZIPCode>01440</ZIPCode>
        </AddressUS>
        <IRCSection>170(b)(1)(a)(v)</IRCSection>
        <AmountOfCashGrant>20000</AmountOfCashGrant>
        <PurposeOfGrant>These grants were in addition to the grants made by the MDS Foundation to these same schools for their dental hygiene programs.</PurposeOfGrant>
      </RecipientTable>
      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>MINUTEMAN REGIONAL VOCATIONAL TECH SCHOOL</BusinessNameLine1>
        </RecipientNameBusiness>
        <AddressUS>
          <AddressLine1>758 marrett road</AddressLine1>
          <City>lexington</City>
          <State>MA</State>
          <ZIPCode>02421</ZIPCode>
        </AddressUS>
        <IRCSection>170(b)(1)(a)(v)</IRCSection>
        <AmountOfCashGrant>15300</AmountOfCashGrant>
        <PurposeOfGrant>These grants were in addition to the grants made by the MDS Foundation to these same schools for their dental hygiene programs.</PurposeOfGrant>
      </RecipientTable>
      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>DCD (DOCTORS CARING FOR DOCTORS)</BusinessNameLine1>
        </RecipientNameBusiness>
        <AddressUS>
          <AddressLine1>1335 Industrial Boulevard Suite 200</AddressLine1>
          <AddressLine2>200</AddressLine2>
          <City>minneapolis</City>
          <State>MN</State>
          <ZIPCode>55413</ZIPCode>
        </AddressUS>
        <AmountOfCashGrant>46692</AmountOfCashGrant>
        <PurposeOfGrant>THESE GRANT MONIES SUPPORT THE ACITIVITIES OF THAT ORGANIZATION THAT WORKS IN CONJUNCTION WITH THE MDS WELL-BEING COMMITTEE. MDS HAS PAID OUT THIS GRANT FOR MANY YEARS AND IT IS PAID IN EQUAL MONTHLY INSTALLMENTS OVER THE COURSE OF THE FISCAL YEAR.</PurposeOfGrant>
      </RecipientTable>
      <Form990ScheduleIPartIV>
        <Identifier>Procedure for Monitoring Grants in the U.S.:</Identifier>
        <ReturnReference>Part I, Line 2:</ReturnReference>
        <Explanation>Schedule I, Part I, Line 2: These grants were to provide funding for a dental hygiene program at schools. The schools submit a report back to us on how the grant monies were spent.</Explanation>
      </Form990ScheduleIPartIV>
    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <BoardOrCommitteeApproval>X</BoardOrCommitteeApproval>
      <SeverancePayment>0</SeverancePayment>
      <SupplementalNonqualRetirePlan>0</SupplementalNonqualRetirePlan>
      <EquityBasedCompArrangement>0</EquityBasedCompArrangement>
      <Form990ScheduleJPartII>
        <NameBusiness>
          <BusinessNameLine1>ROBERT BOOSE</BusinessNameLine1>
        </NameBusiness>
        <BaseCompensationFilingOrg>268940</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>0</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>0</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>16500</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>17250</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>302690</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartII>
        <NameBusiness>
          <BusinessNameLine1>KATHY BOYCE</BusinessNameLine1>
        </NameBusiness>
        <BaseCompensationFilingOrg>152174</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>0</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>0</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>0</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>11471</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>163645</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartII>
        <NameBusiness>
          <BusinessNameLine1>KAREN RAFELD</BusinessNameLine1>
        </NameBusiness>
        <BaseCompensationFilingOrg>146671</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>0</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>0</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>0</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>10766</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>157437</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section A, line 6</Identifier>
        <Explanation>THE ORGANIZATION'S MEMBERSHIP IS COMPRISED OF ORAL HEALTH CARE PROFESSIONALS IN MASSACHUSETTS.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section A, line 7a</Identifier>
        <Explanation>THE ORGANIZATION'S MEMBERS ELECT THE DELEGATES, WHO REPRESENT THEM IN VOTING TO ELECT THE GOVERNING BODY, THE BOARD OF DIRECTORS.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section A, line 7b</Identifier>
        <Explanation>THE ANNUAL MEETING OF DELEGATES HAS THE RIGHT TO ADDRESS ANY ITEMS OR ACTIONS TAKEN BY THE BOARD DURING THE YEAR.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section B, line 11</Identifier>
        <Explanation>The form 990 is provided to the trustees before filing. The CFO of reviews the return prior to being filed.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section B, line 12</Identifier>
        <Explanation>ALL BOARD MEMBERS SIGN THE CONFLICT OF INTEREST POLICY AND ANY CONFLICTS ARE ANNOUNCED AT THE BEGINNING OF EACH BOARD MEETING.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section B, line 15</Identifier>
        <Explanation>THE EXECUTIVE DIRECTOR'S COMPENSATION IS DETERMINED BY THE COMPENSATION COMMITTEE OF THE BOARD OF TRUSTEES. THE CHIEF FINANCIAL OFFICER'S SALARY IS DETERMINED BY THE EXECUTIVE DIRECTOR.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section C, line 19</Identifier>
        <Explanation>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Form 990, Part XI, Line 2c</Identifier>
        <Explanation>THE BOARD OF TRUSTEES ASSUMES RESPONSIBILITY FOR THE OVERSIGHT OF THE AUDIT OF ITS FINANCIAL STATEMENTS AND SELECTION OF THE INDEPENDENT AUDITOR.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <Form990ScheduleRPartI>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>FIRMIN Joint Venture LLC</BusinessNameLine1>
        </NameOfDisregardedEntity>
        <AddressUS>
          <AddressLine1>TWO WILLOW STREET SUITE 200</AddressLine1>
          <City>SOUTHBOROUGH</City>
          <State>MA</State>
          <ZIPCode>01745</ZIPCode>
        </AddressUS>
        <EIN>043446721</EIN>
        <PrimaryActivities>TO OWN MDS' PRINCIPAL PROPERTY</PrimaryActivities>
        <LegalDomicileState>MA</LegalDomicileState>
        <TotalIncome>836788</TotalIncome>
        <EOYAssets>5366216</EOYAssets>
        <DirectControllingEntityName>
          <BusinessNameLine1>MASSACHUSETTS DENTAL SOCIETY</BusinessNameLine1>
        </DirectControllingEntityName>
      </Form990ScheduleRPartI>
      <Form990ScheduleRPartII>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>MDS FOUNDATION INC</BusinessNameLine1>
        </NameOfDisregardedEntity>
        <AddressUS>
          <AddressLine1>TWO WILLOW STREET SUITE 200</AddressLine1>
          <City>SOUTHBOROUGH</City>
          <State>MA</State>
          <ZIPCode>01715</ZIPCode>
        </AddressUS>
        <EIN>043466040</EIN>
        <PrimaryActivities>IMPROVE ORAL HEALTH CARE OF MASSACHUSETTS RESIDENTS</PrimaryActivities>
        <LegalDomicileState>MA</LegalDomicileState>
        <ExemptCodeSection>501(c)(3)</ExemptCodeSection>
        <PublicCharityStatus>Line 9</PublicCharityStatus>
        <DirectControllingEntityName>
          <BusinessNameLine1>MASSACHUSETTS DENTAL SOCIETY</BusinessNameLine1>
        </DirectControllingEntityName>
      </Form990ScheduleRPartII>
      <Form990ScheduleRPartII>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>MASSACHUSETTS DENTAL SOCIETY RELIEF FUND INC</BusinessNameLine1>
        </NameOfDisregardedEntity>
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          <City>SOUTHBOROUGH</City>
          <State>MA</State>
          <ZIPCode>01715</ZIPCode>
        </AddressUS>
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        <PrimaryActivities>HELP DENTISTS IN NEED</PrimaryActivities>
        <LegalDomicileState>MA</LegalDomicileState>
        <ExemptCodeSection>501(c)(3)</ExemptCodeSection>
        <PublicCharityStatus>Line 11a, I</PublicCharityStatus>
        <DirectControllingEntityName>
          <BusinessNameLine1>maSSACHUSETTS DENTAL SOCIETY</BusinessNameLine1>
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      </Form990ScheduleRPartII>
      <Form990ScheduleRPartIV>
        <NameOfRelatedOrg>
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        </NameOfRelatedOrg>
        <AddressUS>
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          <City>SOUTHBOROUGH</City>
          <State>MA</State>
          <ZIPCode>01745</ZIPCode>
        </AddressUS>
        <EIN>043432374</EIN>
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        <LegalDomicileState>MA</LegalDomicileState>
        <DirectControllingEntityName>
          <BusinessNameLine1>MASSACHUSETTS DENTAL SOCIETY</BusinessNameLine1>
        </DirectControllingEntityName>
        <TypeOfEntity>C</TypeOfEntity>
        <ShareOfTotalIncome>439653</ShareOfTotalIncome>
        <ShareOfEOYAssets>260042</ShareOfEOYAssets>
        <PercentageOwnership>1.00000</PercentageOwnership>
      </Form990ScheduleRPartIV>
      <ReceiptOfIntAnnRentsRoyalties>0</ReceiptOfIntAnnRentsRoyalties>
      <GiftGrantOrCapContrToOtherOrg>1</GiftGrantOrCapContrToOtherOrg>
      <GiftGrantOrCapContrFrOtherOrg>0</GiftGrantOrCapContrFrOtherOrg>
      <LoansOrGuaranteesToOtherOrg>0</LoansOrGuaranteesToOtherOrg>
      <LoansOrGuaranteesFromOtherOrg>0</LoansOrGuaranteesFromOtherOrg>
      <SaleOfAssetsToOtherOrg>0</SaleOfAssetsToOtherOrg>
      <PurchaseOfAssetsFromOtherOrg>0</PurchaseOfAssetsFromOtherOrg>
      <ExchangeOfAssets>0</ExchangeOfAssets>
      <RentalOfFacilitiesToOtherOrgs>0</RentalOfFacilitiesToOtherOrgs>
      <RentalOfFacilitiesFrOtherOrgs>0</RentalOfFacilitiesFrOtherOrgs>
      <PerformOfServicesForOtherOrgs>0</PerformOfServicesForOtherOrgs>
      <PerformOfServicesByOtherOrgs>0</PerformOfServicesByOtherOrgs>
      <SharingOfFacilities>1</SharingOfFacilities>
      <SharingOfPaidEmployees>0</SharingOfPaidEmployees>
      <ReimbursementPaidToOtherOrg>1</ReimbursementPaidToOtherOrg>
      <ReimbursementPaidByOtherOrg>1</ReimbursementPaidByOtherOrg>
      <OtherTransferToOtherOrg>0</OtherTransferToOtherOrg>
      <OtherTransferFromOtherOrg>0</OtherTransferFromOtherOrg>
      <TransactionsRelatedOrgsTable>
        <NameOfOtherOrganization>
          <BusinessNameLine1>MDS FOUNDATION INC</BusinessNameLine1>
        </NameOfOtherOrganization>
        <TransactionType>B</TransactionType>
        <AmountInvolved>158000</AmountInvolved>
      </TransactionsRelatedOrgsTable>
      <TransactionsRelatedOrgsTable>
        <NameOfOtherOrganization>
          <BusinessNameLine1>MDS FOUNDATION INC</BusinessNameLine1>
        </NameOfOtherOrganization>
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      </TransactionsRelatedOrgsTable>
      <TransactionsRelatedOrgsTable>
        <NameOfOtherOrganization>
          <BusinessNameLine1>MDS Insurance Services Inc</BusinessNameLine1>
        </NameOfOtherOrganization>
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      </TransactionsRelatedOrgsTable>
      <TransactionsRelatedOrgsTable>
        <NameOfOtherOrganization>
          <BusinessNameLine1>Massachusetts Dental Relief Fund</BusinessNameLine1>
        </NameOfOtherOrganization>
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      <TransactionsRelatedOrgsTable>
        <NameOfOtherOrganization>
          <BusinessNameLine1>MDS FounDATION INC</BusinessNameLine1>
        </NameOfOtherOrganization>
        <TransactionType>O</TransactionType>
        <AmountInvolved>428513</AmountInvolved>
      </TransactionsRelatedOrgsTable>
    </IRS990ScheduleR>
  </ReturnData>
</Return>