WAKEFIELD, MA announced financial results today for the quarter and six months ended June 30, 2008.

The Company's financial results reflect income and expenses, including non-cash items, required by generally accepted accounting principles as a result of the previously announced settlement of litigation among PDG, P.A. ("PDG"), PDHC, Ltd., one of the Company's subsidiaries, and the Company effective February 29, 2008. In addition to its actual results, the Company has provided a pro forma financial presentation that excludes the operating results of 25 dental facilities transferred to PDG on February 29, 2008 and the accounting impact associated with the litigation settlement from both periods of comparison (see "PDG Litigation Settlement Accounting" and "Supplemental Operating Data" tables).

Comparing actual results and pro forma results for the second quarter of 2008 with the second quarter of 2007:

--  Net revenue was $74,639,000 as compared to $66,552,000. Pro forma net
    revenue was $70,032,000 as compared to $53,989,000.
--  Earnings from operations were $9,082,000 as compared to $8,187,000.
    Pro forma earnings from operations were $5,598,000 as compared to
    $6,251,000.
--  Net earnings were $3,973,000 as compared to $4,528,000. Pro forma net
    earnings were $1,847,000 as compared to $3,169,000.
--  Diluted net earnings per share were $0.30 as compared to $0.34. Pro
    forma diluted net earnings per share were $0.14 as compared to $0.25.
--  Diluted cash net earnings per share were $0.41 as compared to $0.40.
    Pro forma diluted cash net earnings per share were $0.24 as compared to
    $0.32.
    

Comparing actual results and pro forma results for the first six months of 2008 with the first six months of 2007:

--  Net revenue was $154,450,000 as compared to $132,010,000. Pro forma
    net revenue was $140,086,000 as compared to $106,841,000.
--  Earnings from operations were $46,962,000 as compared to $15,410,000.
    Pro forma earnings from operations were $11,051,000 as compared to
    $11,296,000.
--  Net earnings were $25,498,000 as compared to $8,407,000. Pro forma net
    earnings were $3,590,000 as compared to $5,929,000.
--  Diluted net earnings per share were $1.95 as compared to $0.64. Pro
    forma diluted net earnings per share were $0.27 as compared to $0.45.
--  Diluted cash net earnings per share were $2.15 as compared to $0.76.
    Pro forma diluted cash net earnings per share were $0.48 as compared to
    $0.58.
    

Operating Results

Patient revenue of the Company's affiliated dental group practices was $105,952,000 for the quarter, which includes $99,909,000 from dental group practices which are affiliated with the Company by means of service agreements and $6,043,000 from Arizona's Tooth Doctor for Kids. Same market patient revenue growth was 6.5% for the quarter and (0.2%) excluding in-market affiliations.

Cash flow from operations was $13,660,000 for the quarter. Capital expenditures were $2,857,000 for the quarter. The Company expanded and/or relocated three dental facilities during the quarter. Amounts paid for affiliations and acquisitions, including contingent amounts and affiliation costs, amounted to $9,132,000 during the quarter, which included a contingent amount related to the Company's acquisition of Metropolitan Dental Holdings, Inc. of $9,685,000 of which $9,084,000 was paid in the quarter.

PDG Litigation Settlement Accounting

As previously reported, the Company completed the settlement of the litigation with PDG effective February 29, 2008 which included transferring the operating assets of 25 dental facilities to PDG and entering into a transition services agreement with PDG in which the Company is obligated to provide interim management services to PDG through September 30, 2008.

During the quarter, PDG reimbursed the Company $1,274,000 for expenses associated with certain PDG doctors remaining on a temporary basis in six dental facilities retained by the Company as part of the settlement agreement. The Company also recognized $687,000 of income associated with the litigation as a result of $1,002,000 of insurance proceeds received for professional fees that were partially reimbursable pursuant to insurance coverage offset by professional fees and other expenses associated with the litigation of $315,000. During the quarter, the Company recognized $3,333,000 of income under the transition services agreement with PDG and incurred approximately $537,000 of associated expenses.

Cash net earnings and cash earnings from operations are non-GAAP financial measures. In accordance with the requirement of SEC Regulation G, please see the attached financial tables for a presentation of the most comparable GAAP measures and the reconciliation to the nearest GAAP measure and all additional reconciliations required by Regulation G.

For further discussion of these events and a comprehensive review of the second quarter ended June 30, 2008, the Company will host its previously announced conference call on Tuesday, July 29, 2008 at 10:00 a.m. EDT, which will be broadcast live over the Internet at www.amdpi.com. The call will be hosted by Gregory A. Serrao, Chairman, President and Chief Executive Officer. To access the webcast, participants should visit the Investor Relations section of the website at least fifteen minutes prior to the start of the conference call to download and install any necessary audio software. A replay of the webcast will be available at www.amdpi.com approximately two hours after the call through 6:00 p.m. EDT Tuesday, August 5, 2008.

American Dental Partners is one of the nation's leading business partners to dental group practices. The Company is affiliated with 27 dental group practices which have 242 dental facilities with approximately 2,097 operatories located in 18 states.

"Safe Harbor" Statement under the Private Securities Litigation Reform Act of 1995: With the exception of the historical information contained in this news release, the matters described herein contain "forward-looking" statements that involve risk and uncertainties that may individually or collectively impact the matters herein described, including but not limited to the possibility that we may not realize the benefits expected from our acquisition and affiliation strategy, economic, regulatory and/or other factors outside the control of the Company, settlements or judgements of pending litigation, which are detailed from time to time in the "Risk Factors" section of the Company's SEC reports, including the annual report on Form 10-K for the year ended December 31, 2007.

                      AMERICAN DENTAL PARTNERS, INC.
                          FINANCIAL HIGHLIGHTS
                (in thousands, except per share amounts)
                               (unaudited)


                                 Three Months Ended     Six Months Ended
                                      June 30,              June 30,
                                --------------------  --------------------
                                  2008       2007       2008       2007
                                ---------  ---------- ---------  ----------

Net revenue                     $  74,639  $   66,552 $ 154,450  $  132,010
Operating expenses:
  Salaries and benefits            31,355      27,194    66,856      55,165
  Lab fees and dental supplies     11,143      10,506    23,124      20,680
  Office occupancy expenses         8,480       7,273    17,493      14,409
  Other operating expenses          6,708       5,559    13,480      11,060
  General corporate expenses        3,465       3,322     7,095       6,703
  Depreciation expense              2,684       2,206     5,458       4,310
  Amortization of intangible
   assets                           2,409       1,483     4,796       2,925
  Litigation settlement (gain)
   expense                           (687)        822   (30,814)      1,348
                                ---------  ---------- ---------  ----------
     Total operating
      expenses                     65,557      58,365   107,488     116,600
                                ---------  ---------- ---------  ----------
Earnings from operations            9,082       8,187    46,962      15,410
  Interest expense, net             2,419         578     4,874       1,203
  Minority interest                   151          90       291         247
                                ---------  ---------- ---------  ----------
Earnings before income taxes        6,512       7,519    41,797      13,960
  Income taxes                      2,539       2,991    16,299       5,553
                                ---------  ---------- ---------  ----------
Net earnings                    $   3,973  $    4,528 $  25,498  $    8,407
                                =========  ========== =========  ==========

Net earnings per common share:
  Basic                         $    0.31  $     0.36 $    1.98  $     0.67
                                =========  ========== =========  ==========
  Diluted                       $    0.30  $     0.34 $    1.95  $     0.64
                                =========  ========== =========  ==========
Weighted average common shares
 outstanding:
  Basic                            12,862      12,669    12,850      12,563
                                =========  ========== =========  ==========
  Diluted                          13,117      13,302    13,106      13,203
                                =========  ========== =========  ==========




                           AMERICAN DENTAL PARTNERS, INC.
                               FINANCIAL HIGHLIGHTS
                                  (in thousands)
                                    (unaudited)


                                                    June 30,   December 31,
                                                      2008        2007
                                                   ---------- -------------
ASSETS
Current assets:
  Cash and cash equivalents                        $    6,917 $       6,376
  Accounts receivable, net                             34,216        23,621
  Other current assets                                  9,481        25,261
                                                   ---------- -------------
    Total current assets                               50,614        55,258
                                                   ---------- -------------

Property and equipment, net                            52,149        60,445
                                                   ---------- -------------
Other non-current assets:
  Goodwill                                             76,072        70,602
  Intangible assets, net                              177,364       179,969
  Other assets                                          2,804         2,232
                                                   ---------- -------------
    Total non-current assets                          256,240       252,803
                                                   ---------- -------------
    Total assets                                   $  359,003 $     368,506
                                                   ========== =============

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable and accrued expenses            $   34,048 $      40,524
  Accrued litigation expense                                -        30,968
  Other current liabilities                                 -         3,475
  Current maturities of debt                              192           188
                                                   ---------- -------------
    Total current liabilities                          34,240        75,155
                                                   ---------- -------------
Non-current liabilities:
  Long-term debt                                      145,233       140,986
  Other liabilities                                    36,977        36,568
                                                   ---------- -------------
    Total non-current liabilities                     182,210       177,554
                                                   ---------- -------------
    Total liabilities                                 216,450       252,709
                                                   ---------- -------------

Minority Interest                                         693           894

Commitments and contingencies
Stockholders' equity                                  141,860       114,903
                                                   ---------- -------------
    Total liabilities and stockholders' equity     $  359,003 $     368,506
                                                   ========== =============




                          AMERICAN DENTAL PARTNERS, INC.
                           SUPPLEMENTAL OPERATING DATA
                      (in thousands, except per share amounts)
                                   (unaudited)

                     Pro forma consolidated statement of income
                      for the three months ended June 30, 2008


                                         Pro Forma Adjustments
                                         ---------------------
                                                       Management
                                       Settlement       Services
                              Actual   Assets (a)         (b)     Pro Forma
                              -------  ----------      ---------- ---------

Net revenue                   $74,639  $    1,274      $    3,333 $  70,032
Operating expenses
  Salaries and benefits        31,355         962             355    30,038
  Lab fees and dental
   supplies                    11,143         135               -    11,008
  Office occupancy expenses     8,480         229              60     8,191
  Other operating expenses      6,708        (117)            108     6,718
  General corporate expenses    3,465           -               -     3,465
  Litigation expenses            (687)       (687) (c)          -         -
                              -------  ----------      ---------- ---------
EBITDA                         14,175         752           2,811    10,612
  Depreciation                  2,684          65              14     2,605
  Amortization                  2,409           -               -     2,409
                              -------  ----------      ---------- ---------
Earnings from operations        9,082         687           2,797     5,598
  Interest expense, net         2,419           -               -     2,419
  Minority interest               151           -               -       151
                              -------  ----------      ---------- ---------
Earnings before income taxes    6,512         687           2,797     3,028
  Income taxes                  2,539                                 1,181
                              -------                             ---------
Net earnings                    3,973                                 1,847
Amortization of service
 agreements, net of tax         1,364                                 1,364
                              -------                             ---------
Cash net earnings (d)         $ 5,337                             $   3,211
                              =======                             =========

Diluted net earnings per
 common share                 $  0.30                             $    0.14
                              =======                             =========
Diluted cash net earnings per
 common share (d)             $  0.41                             $    0.24
                              =======                             =========


(a) Includes expense reimbursement associated with the PDG doctors who
    practiced temporarily in the six dental facilities retained by the
    Company.

(b) The Company has agreed to provide interim management services to PDG
    through September 30, 2008.  Includes interim management fee revenue
    and expenses associated with providing such services.

(c) Includes insurance proceeds of $1,002,000 received for professional
    fees that were partially reimbursable pursuant to insurance coverage
    offset by professional fees and other expenses associated with the
    litigation of $315,000.
(d) Cash net earnings and diluted cash net earnings per share are not
    measures of financial performance under GAAP.  Cash net earnings
    excludes amortization expense related to service agreement intangible
    assets, net of tax.  The Company incurs significant amortization
    expense related to its service agreements while many companies, both in
    the same industry and other industries, no longer amortize a
    significant portion of their intangible assets pursuant to Statement of
    Financial Accounting Standards No. 142 - Goodwill and Other Intangible
    Assets.  The Company believes that cash net earnings and diluted cash
    net earnings per share are important financial measures for
    understanding its relative financial performance.




                    AMERICAN DENTAL PARTNERS, INC.
                     SUPPLEMENTAL OPERATING DATA
               (in thousands, except per share amounts)
                             (unaudited)

              Pro forma consolidated statement of income
               for the three months ended June 30, 2007


                                        Pro Forma Adjustments
                                        ---------------------
                                                       Management
                                      Settlement        Services
                             Actual   Assets (e)          (f)     Pro Forma
                             -------- ----------      ----------- ---------

Net revenue                  $ 66,552 $    9,118      $     3,445 $  53,989
Operating expenses
  Salaries and benefits        27,194      5,060              503    21,631
  Lab fees and dental
   supplies                    10,506      1,768                -     8,738
  Office occupancy expenses     7,273      1,143               50     6,080
  Other operating expenses      5,559        801              122     4,635
  General corporate
   expenses                     3,322          -                -     3,322
  Litigation expenses             822        822  (g)           -         -
                             -------- ----------      ----------- ---------
EBITDA                         11,876       (476)           2,770     9,582
  Depreciation                  2,206        346               14     1,848
  Amortization                  1,483          -                -     1,483
                             -------- ----------      ----------- ---------
Earnings from operations        8,187       (822)           2,756     6,251
  Interest expense, net           578          -                -       578
  Minority interest                90          -                -        90
                             -------- ----------      ----------- ---------
Earnings before income taxes    7,519       (822)           2,756     5,583
  Income taxes                  2,991                                 2,222
                             --------                             ---------
Net earnings                    4,528                                 3,361
Amortization of service
 agreements, net of tax           856                                   856
                             --------                             ---------
Cash net earnings (h)        $  5,384                             $   4,217
                             ========                             =========

Diluted net earnings per
 common share                $   0.34                             $    0.25
                             ========                             =========
Diluted cash net earnings
 per common share (h)        $   0.40                             $    0.32
                             ========                             =========


(e) Includes expense reimbursement associated with 25 dental facilities
    transferred to PDG as part of litigation settlement.

(f) The Company provided management services pursuant to a Service
    Agreement with PDG through December 31, 2007.  Includes estimated
    proportion of service fee revenue and associated expenses for 25 of
    the 31 dental facilities transferred to PDG.

(g) Includes professional fees associated with PDG litigation of
    $822,000.

(h) Cash net earnings and diluted cash net earnings per share are not
    measures of financial performance under GAAP.  Cash net earnings
    excludes amortization expense related to service agreement intangible
    assets, net of tax.  The Company incurs significant amortization
    expense related to its service agreements while many companies, both
    in the same industry and other industries, no longer amortize a
    significant portion of their intangible assets pursuant to Statement
    of Financial Accounting Standards No. 142 - Goodwill and Other
    Intangible Assets.  The Company believes that cash net earnings and
    diluted cash net earnings per share are important financial measures
    for understanding its relative financial performance.




                    AMERICAN DENTAL PARTNERS, INC.
                     SUPPLEMENTAL OPERATING DATA
               (in thousands, except per share amounts)
                             (unaudited)

              Pro forma consolidated statement of income
                for the six months ended June 30, 2008

                                       Pro Forma Adjustments
                                       ---------------------
                                    Settlement      Management
                           Actual   Assets (i)      Services (j) Pro Forma
                         ---------  ----------      ------------ ----------

Net revenue              $ 154,450  $    7,697      $      6,667 $  140,086
Operating expenses
  Salaries and benefits     66,856       4,717             1,207     60,932
  Lab fees and dental
   supplies                 23,124       1,436                 -     21,688
  Office occupancy
   expenses                 17,493       1,092               120     16,281
  Other operating
   expenses                 13,480         135               215     13,130
  General corporate
   expenses                  7,095           -                 -      7,095
  Litigation expenses      (30,814)    (30,814) (k)            -          -
                         ---------  ----------      ------------ ----------
EBITDA                      57,216      31,131             5,125     20,960
  Depreciation               5,458         317                28      5,113
  Amortization               4,796           -                 -      4,796
                         ---------  ----------      ------------ ----------
Earnings from operations    46,962      30,814             5,097     11,051
  Interest expense, net      4,874           -                 -      4,874
  Minority interest            291           -                 -        291
                         ---------  ----------      ------------ ----------
Earnings before income
 taxes                      41,797      30,814             5,097      5,886
  Income taxes              16,299                                    2,296
                         ---------                               ----------
Net earnings                25,498                                    3,590
Amortization of service
 agreements, net of tax      2,714                                    2,714
                         ---------                               ----------
Cash net earnings (l)    $  28,212                               $    6,304
                         =========                               ==========

Diluted net earnings per
 common share            $    1.95                               $     0.27
                         =========                               ==========
Diluted cash net
 earnings per common
 share (l)               $    2.15                               $     0.48
                         =========                               ==========


(i) Includes expense reimbursement associated with (i) 25 dental facilities
    transferred on February 29, 2008 to PDG as part of litigation
    settlement and (ii) the PDG doctors who practiced temporarily in the
    six dental facilities retained by the Company.

(j) The Company has agreed to provide interim management services to PDG
    through September 30, 2008.  Includes interim  management fee revenue,
    expenses associated with providing such services, and salaries and
    benefits expense of  management staff, including severance, who have
    been terminated as a result of realigning the Company's Minnesota-based
    management team.

(k) Includes gain on disposal of assets of $30,763,000 and insurance
    proceeds of $1,002,000 for professional fees associated with the PDG
    litigation which were partially reimbursable pursuant to insurance
    coverage offset by professional fees and other expenses associated
    with the litigation of $951,000.

(l) Cash net earnings and diluted cash net earnings per share are not
    measures of financial performance under GAAP.  Cash net earnings
    excludes amortization expense related to service agreement intangible
    assets, net of tax.  The Company incurs significant amortization
    expense related to its service agreements while many companies, both
    in the same industry and other industries, no longer amortize a
    significant portion of their intangible assets pursuant to Statement
    of Financial Accounting Standards No. 142 - Goodwill and Other
    Intangible Assets.  The Company believes that cash net earnings and
    diluted cash net earnings per share are important financial measures
    for understanding its relative financial performance.



                     AMERICAN DENTAL PARTNERS, INC.
                      SUPPLEMENTAL OPERATING DATA
                (in thousands, except per share amounts)
                              (unaudited)

                 Pro forma consolidated statement of income
                   for the six months ended June 30, 2007

                                       Pro Forma Adjustments
                                      -----------------------
                                      Settlement    Management
                            Actual    Assets (m)    Services(n)  Pro Forma
                          ----------- ----------    ----------- -----------

Net revenue               $   132,010 $   18,338    $     6,831 $   106,841
Operating expenses
    Salaries and benefits      55,165     10,215          1,008      43,942
    Lab fees and dental
     supplies                  20,680      3,573              -      17,107
    Office occupancy
     expenses                  14,409      2,277             98      12,034
    Other operating
     expenses                  11,060      1,583            232       9,245
    General corporate
     expenses                   6,703          -              -       6,703
    Litigation expenses         1,348      1,348(o)           -           -
                          ----------- ----------    ----------- -----------
EBITDA                         22,645       (658)         5,493      17,810
    Depreciation                4,310        690             31       3,589
    Amortization                2,925          -              -       2,925
                          ----------- ----------    ----------- -----------
Earnings from operations       15,410     (1,348)         5,462      11,296
    Interest expense, net       1,203          -              -       1,203
    Minority interest             247          -              -         247
                          ----------- ----------    ----------- -----------
Earnings before income
 taxes                         13,960     (1,348)         5,462       9,846
    Income taxes                5,553                                 3,917
                          -----------                           -----------
Net earnings                    8,407                                 5,929
Amortization of service
 agreements, net of tax         1,687                                 1,687
                          -----------                           -----------
Cash net earnings (p)     $    10,094                           $     7,616
                          ===========                           ===========

Diluted net earnings per
 common share             $      0.64                           $      0.45
                          ===========                           ===========
Diluted cash net earnings
 per common share (p)     $      0.76                           $      0.58
                          ===========                           ===========


(m) Includes expense reimbursement associated with (i) 25 dental facilities
transferred on February 29, 2008 to PDG as part of litigation settlement
and (ii) the PDG doctors who practiced temporarily in the six dental
facilities retained by the Company.

(n) The Company provided management services to pursuant to a Service
Agreement with PDG through December 31, 2007. Includes estimated
proportion of service fee revenue and associated expenses for 25 of the 31
dental facilities transferred to PDG.

(o) Includes professional fees associated with PDG litigation of
$1,348,000.

(p) Cash net earnings and diluted cash net earnings per share are not
measures of financial performance under GAAP. Cash net earnings excludes
amortization expense related to service agreement intangible assets, net of
tax. The Company incurs significant amortization expense related to its
service agreements while many companies, both in the same industry and
other industries, no longer amortize a significant portion of their
intangible assets pursuant to Statement of Financial Accounting Standards
No. 142 - Goodwill and Other Intangible Assets. The Company believes that
cash net earnings and diluted cash net earnings per share are important
financial measures for understanding its relative financial performance.




                AMERICAN DENTAL PARTNERS, INC.
                 SUPPLEMENTAL OPERATING DATA
            (in thousands, except per share amounts)
                         (unaudited)

      Change in pro forma consolidated statements of income
     for the three and six months ended June 30, 2008 and 2007

                  Three Months Ended June 30,  Six Months Ended June 30,
                  --------------------------- ---------------------------
                                     Change                       Change
                              Pro    in Pro               Pro     in Pro
                  Pro Forma  Forma    Forma   Pro Forma  Forma     Forma
                    2008      2007   Results    2008      2007    Results
                  --------- -------- -------  --------- --------- -------

Net revenue      $  70,032 $ 53,989      30%  $ 140,086 $ 106,841      31%
Operating
 expenses
  Salaries and
   benefits         30,038   21,631      39%     60,932    43,942      39%
  Lab fees and
   dental supplies  11,008    8,738      26%     21,688    17,107      27%
  Office occupancy
   expenses          8,191    6,080      35%     16,281    12,034      35%
  Other operating
   expenses          6,718    4,635      45%     13,130     9,245      42%
  General corporate
   expenses          3,465    3,322      (5%)     7,095     6,703       6%
  Litigation
   expenses              -        -       0%          -         -       0%
                 --------- -------- -------   --------- --------- -------
EBITDA              10,612    9,582      11%     20,960    17,810      18%
  Depreciation       2,605    1,848      41%      5,113     3,589      42%
  Amortization       2,409    1,483      62%      4,796     2,925      64%
                 --------- -------- -------   --------- --------- -------
Earnings from
 operations          5,598    6,251     (10%)    11,051    11,296      (2%)
  Interest
   expense, net      2,419      578     319%      4,874     1,203     305%
  Minority
   interest            151       90      68%        291       247      18%
                 --------- -------- -------   --------- --------- -------
Earnings before
 income taxes        3,028    5,583     (46%)     5,886     9,846     (40%)
  Income taxes       1,181    2,222     (45%)     2,296     3,917     (41%)
                 --------- -------- -------   --------- --------- -------
Net earnings         1,847    3,361     (45%)     3,590     5,929     (39%)
Amortization of
 service
 agreements, net
 of tax              1,364      856      59%      2,714     1,687      61%
                 --------- -------- -------   --------- --------- -------
Cash net
 earnings        $   3,211 $  4,217     (24%) $   6,304 $   7,616     (17%)
                 ========= ======== =======   ========= ========= =======

Diluted net
 earnings per
 common share    $    0.14 $   0.25     (42%) $    0.27 $    0.45     (39%)
                 ========= ======== =======   ========= ========= =======
Diluted cash net
 earnings per
 common share    $    0.24 $   0.32     (21%) $    0.48 $    0.58     (17%)
                 ========= ======== =======   ========= ========= =======



                       AMERICAN DENTAL PARTNERS, INC.
                        SUPPLEMENTAL OPERATING DATA
             (in thousands, except selected statistical data)

                               (unaudited)

                        Selected statistical data

                                         June 30,    June 30,       %
                                           2008        2007       Change
                                        ----------- ----------- ----------

Number of dental facilities                     242         220       10.0%
Number of operatories (q)                     2,097       1,997        5.0%
Number of affiliated dentists (r)               544         524        3.8%


(q) An operatory is an area where dental care is performed and generally
contains a dental chair, a hand piece delivery system and other essential
equipment.

(r) Includes full-time equivalent general or specialty dentists employed by
or contracted with the affiliated practices, including Arizona's Tooth
Doctor for Kids.



         Patient revenue and same market patient revenue growth (s)

                  Three Months Ended             Six Months Ended
                       June 30,                      June 30,
                 --------------------          --------------------
                                        %                             %
                   2008        2007   Change     2008        2007   Change
                 ---------  --------- ------   ---------   -------- ------
Patient revenue
 of affiliated
 practices:
  Platform
   dental group
   practices
   affiliated
   with us in
   both periods
   of
   comparison    $  81,249  $  76,278    6.5%  $ 164,341  $ 151,920    8.2%
  Platform
   dental group
   practices
   that
   affiliated
   with us
   during
   periods of
   comparison       24,703(t)  23,849(t) 3.6%     48,985(u)  46,745(u) 4.8%
                 ---------  ---------   ----   ---------   --------   ----
Total patient
 revenue           105,952    100,127    5.8%    213,326    198,665    7.4%
Patient revenue
 of Arizona's
 Tooth Doctor
 for Kids            6,043      5,752    5.1%     12,165     11,555    5.3%
                 ---------  ---------   ----   ---------   --------   ----
Patient revenue
 of platform
 dental group
 practices
 affiliated
 with us by
 means of
 service
 agreements         99,909     94,375    5.9%    201,161    187,110    7.5%
Amounts due to
 us under
 service
 agreements         63,032     59,559    5.8%    125,827    118,039    6.6%
                 ---------  ---------   ----   ---------   --------   ----
Amounts
 retained by
 platform
 dental group
 practices
 affiliated
 with us by
 means of
 service
 agreements      $  36,877  $  34,816    5.9%  $  75,334  $  69,071    9.1%
                 =========  =========   ====   =========   ========   ====

(s) Includes patient revenue of affiliated dental group practices which are
not consolidated with the Company's financial results and patient revenue
of Arizona's Tooth Doctor for Kids which is consolidated with the Company's
financial results.

(t) In addition to platform affiliations completed since April 1, 2007,
also includes patient revenue of the six dental facilities retained by the
Company for the three months ended June 30, 2008 and the 31 dental
facilities comprising Park Dental for the three months ended June 30, 2007.

(u) In addition to platform affiliations completed since January 1, 2007,
also includes patient revenue of the six dental facilities retained by the
Company for the six months ended June 30, 2008 and the 31 dental facilities
comprising Park Dental for the six months ended June 30, 2007.


Contacts: Gregory A. Serrao Chairman, President and Chief Executive Officer 781-224-0880 Breht T. Feigh Executive Vice President, Chief Financial Officer and Treasurer 781-224-0880 American Dental Partners, Inc. 401 Edgewater Place, Suite 430 Wakefield, MA 01880 Phone: 781/224-0880 Fax: 781/224-4216

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