THIS NOTE AND THE COMMON SHARES ISSUABLE UPON CONVERSION OF THIS NOTE HAVE NOT
BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY STATE
SECURITIES LAWS. THIS NOTE AND THE COMMON SHARES ISSUABLE UPON CONVERSION OF
THIS NOTE MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYPOTHECATED IN THE
ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT AS TO THIS NOTE UNDER SAID ACT
AND ANY APPLICABLE STATE SECURITIES LAWS OR AN OPINION OF COUNSEL REASONABLY
SATISFACTORY TO SCIENCE DYNAMICS CORPORATION THAT SUCH REGISTRATION IS NOT
REQUIRED.


               AMENDED AND RESTATED SECURED CONVERTIBLE TERM NOTE

      FOR VALUE RECEIVED, SCIENCE DYNAMICS CORPORATION, a Delaware corporation
(the "BORROWER"), hereby promises to pay to LAURUS MASTER FUND, LTD., c/o M&C
Corporate Services Limited, P.O. Box 309 GT, Ugland House, South Church Street,
George Town, Grand Cayman, Cayman Islands, Fax: 345-949-8080 (the "HOLDER") or
its registered assigns or successors in interest, on order, the sum of Two
Million Dollars ($2,000,000), together with any accrued and unpaid interest
hereon, on February 11, 2008 (the "MATURITY DATE") if not sooner paid. This Note
amends and restates in its entirety, and is given in substitution for and not in
satisfaction of that certain promissory note in the original principal amount of
$2,000,000 issued by the Company in favor of the Holder on February 11, 2005.

      Capitalized terms used herein without definition shall have the meanings
ascribed to such terms in that certain Securities Purchase Agreement dated as of
the date hereof between the Borrower and the Holder (as amended, modified or
supplemented from time to time, the "PURCHASE AGREEMENT").

The following terms shall apply to this Amended and Restated Secured Convertible
Term Note (this "NOTE"):

                                    ARTICLE I
                             INTEREST & AMORTIZATION

      1.1(a) Interest Rate. Subject to Sections 4.11 and 5.6 hereof, interest
payable on this Note shall accrue at a rate per annum (the "Interest Rate")
equal to the "prime rate" published in The Wall Street Journal from time to
time, plus three percent (3%). The prime rate shall be increased or decreased as
the case may be for each increase or decrease in the prime rate in an amount
equal to such increase or decrease in the prime rate; each change to be
effective as of the day of the change in such rate. Subject to Section 1.1(b)
hereof, the Interest Rate shall not be less than eight percent (8.0%). Interest
shall be (i) calculated on the basis of a 360 day year, and (ii) payable
monthly, in arrears, commencing on March 1, 2005 and on the first business day
of each consecutive calendar month thereafter until the Maturity Date (and on
the Maturity Date), whether by acceleration or otherwise (each, a "REPAYMENT
DATE").

                                        1
<PAGE>

      1.1 (b) Interest Rate Adjustment. The Interest Rate shall be calculated on
the last business day of each month hereafter until the Maturity Date (each a
"Determination Date") and shall be subject to adjustment as set forth herein. If
(i) the Borrower shall have registered the shares of the Borrower's common stock
underlying each of the conversion of the Note and that certain warrant issued to
Holder on a registration statement declared effective by the Securities and
Exchange Commission (the "SEC"), and (ii) the market price (the "Market Price")
of the Common Stock as reported by Bloomberg, L.P. on the Principal Market (as
defined below) for the five (5) trading days immediately preceding a
Determination Date exceeds the then applicable Fixed Conversion Price by at
least twenty five percent (25%), the Interest Rate for the succeeding calendar
month shall automatically be reduced by 200 basis points (200 b.p.) (2.0.%) for
each incremental twenty five percent (25%) increase in the Market Price of the
Common Stock above the then applicable Fixed Conversion Price. Notwithstanding
the foregoing (and anything to the contrary contained in herein), in no event
shall the Interest Rate be less than zero percent (0%).

      1.2 Minimum Monthly Principal Payments. Amortizing payments of the
aggregate principal amount outstanding under this Note at any time (the
"PRINCIPAL AMOUNT") shall begin on June 1, 2005 and shall recur on the first
business day of each succeeding month thereafter until the Maturity Date (each,
an "AMORTIZATION Date"). Subject to Article 3 below, beginning on the first
Amortization Date, the Borrower shall make monthly payments to the Holder on
each Repayment Date, each in the amount of $60,606.06, together with any accrued
and unpaid interest to date on such portion of the Principal Amount plus any and
all other amounts which are then owing under this Note, the Purchase Agreement
or any other Related Agreement but have not been paid (collectively, the
"MONTHLY AMOUNT"). Any Principal Amount that remains outstanding on the Maturity
Date shall be due and payable on the Maturity Date.

                                   ARTICLE II
                              CONVERSION REPAYMENT

      2.1 (a) Payment of Monthly Amount in Cash or Common Stock. If the Monthly
Amount (or a portion thereof of such Monthly Amount if such portion of the
Monthly Amount would have been converted into shares of Common Stock but for
Section 3.2) is required to be paid in cash pursuant to Section 2.1(b), then the
Borrower shall pay the Holder an amount equal to 102% of the Monthly Amount due
and owing to the Holder on the Repayment Date in cash. If the Monthly Amount (or
a portion of such Monthly Amount if not all of the Monthly Amount may be
converted into shares of Common Stock pursuant to Section 3.2) is required to be
paid in shares of Common Stock pursuant to Section 2.1(b), the number of such
shares to be issued by the Borrower to the Holder on such Repayment Date (in
respect of such portion of the Monthly Amount converted into in shares of Common
Stock pursuant to Section 2.1(b)), shall be the number determined by dividing
(x) the portion of the Monthly Amount converted into shares of Common Stock, by
(y) the then applicable Fixed Conversion Price. For purposes hereof, the "FIXED
CONVERSION PRICE" means (x) in respect of the first $500,000 of principal amount
converted under the terms of this Note, $0.06 and (y) in respect of the
remaining principal amount outstanding under this Note, $0.10.

                                        2
<PAGE>

      (b) Monthly Amount Conversion Guidelines. Subject to Sections 2.1(a), 2.2,
and 3.2 hereof, the Holder shall convert into shares of Common Stock all or a
portion of the Monthly Amount due on each Repayment Date according to the
following guidelines (the "CONVERSION CRITERIA"): (i) the closing price of the
Common Stock as reported by Bloomberg, L.P. on the Principal Market on the date
such Repayment Date shall be greater than or equal to 115% of the Fixed
Conversion Price and (ii) the amount of such conversion does not exceed twenty
five percent (25%) of the aggregate dollar trading volume of the Common Stock
for the twenty two (22) day trading period immediately preceding the applicable
Repayment Date. If the Conversion Criteria are not met, the Holder shall convert
only such part of the Monthly Amount that meets the Conversion Criteria. Any
part of the Monthly Amount due on a Repayment Date that the Holder has not been
able to convert into shares of Common Stock due to failure to meet the
Conversion Criteria, shall be paid by the Borrower in cash at the rate of 102%
of the Monthly Amount otherwise due on such Repayment Date, within three (3)
business days of the applicable Repayment Date.

      2.2 No Effective Registration. Notwithstanding anything to the contrary
herein, none of the Borrower's obligations to the Holder may be converted into
Common Stock unless (i) either (x) an effective current Registration Statement
(as defined in the Registration Rights Agreement) covering the shares of Common
Stock to be issued in connection with satisfaction of such obligations exists or
(y) an exemption from registration of the Common Stock is available to pursuant
to Rule 144 of the Securities Act and (ii) no Event of Default hereunder exists
and is continuing, unless such Event of Default is cured within any applicable
cure period or is otherwise waived in writing by the Holder in whole or in part
at the Holder's option.

      2.3 Optional Redemption in Cash. The Borrower will have the option of
prepaying this Note ("OPTIONAL REDEMPTION") by paying to the Holder a sum of
money equal to one hundred thirty percent (130%) of the principal amount of this
Note together with accrued but unpaid interest thereon and any and all other
sums due, accrued or payable to the Holder arising under this Note, the Purchase
Agreement, or any Related Agreement (the "REDEMPTION AMOUNT") outstanding on the
Redemption Payment Date (as defined below). The Borrower shall deliver to the
Holder a written notice of redemption (the "NOTICE OF REDEMPTION") specifying
the date for such Optional Redemption (the "REDEMPTION PAYMENT DATE"), which
date shall be ten (10) business days after the date of the Notice of Redemption
(the "REDEMPTION PERIOD"). A Notice of Redemption shall not be effective with
respect to any portion of this Note for which the Holder has a pending election
to convert pursuant to Section 3.1, or for conversions initiated or made by the
Holder pursuant to Section 3.1 during the Redemption Period. The Redemption
Amount shall be determined as if such Holder's conversion elections had been
completed immediately prior to the date of the Notice of Redemption. On the
Redemption Payment Date, the Redemption Amount must be paid in good funds to the
Holder. In the event the Borrower fails to pay the Redemption Amount on the
Redemption Payment Date as set forth herein, then such Redemption Notice will be
null and void.

                                        3
<PAGE>

                                   ARTICLE III
                                CONVERSION RIGHTS

      3.1. Holder's Conversion Rights. The Holder shall have the right, but not
the obligation, to convert all or any portion of the then aggregate outstanding
principal amount of this Note, together with interest and fees due hereon, into
shares of Common Stock subject to the terms and conditions set forth in this
Article III. The Holder may exercise such right by delivery to the Borrower of a
written notice of conversion not less than one (1) day prior to the date upon
which such conversion shall occur. The shares of Common Stock to be issued upon
such conversion are herein referred to as the "CONVERSION SHARES."

      3.2 Conversion Limitation. Notwithstanding anything herein to the
contrary, in no event shall the Holder be entitled to convert any portion of
this Note in excess of that portion of this Note upon exercise of which the sum
of (1) the number of shares of Common Stock beneficially owned by the Holder and
its Affiliates (other than shares of Common Stock which may be deemed
beneficially owned through the ownership of the unconverted portion of this Note
or the unexercised or unconverted portion of any other security of the Holder
subject to a limitation on conversion analogous to the limitations contained
herein) and (2) the number of shares of Common Stock issuable upon the
conversion of the portion of this Note with respect to which the determination
of this proviso is being made, would result in beneficial ownership by the
Holder and its Affiliates of any amount greater than 9.99% of the then
outstanding shares of Common Stock (whether or not, at the time of such
conversion, the Holder and its Affiliates beneficially own more than 9.99% of
the then outstanding shares of Common Stock). As used herein, the term
"AFFILIATE" means any person or entity that, directly or indirectly through one
or more intermediaries, controls or is controlled by or is under common control
with a person or entity, as such terms are used in and construed under Rule 144
under the Securities Act. For purposes of the proviso to the second preceding
sentence, beneficial ownership shall be determined in accordance with Section
13(d) of the Securities Exchange Act of 1934, as amended, and Regulations 13D-G
thereunder, except as otherwise provided in clause (1) of such proviso. The
limitations set forth herein (x) may be waived by the Holder upon provision of
no less than seventy-five (75) days prior notice to the Company and (y) shall
automatically become null and void (i) following notice to the Company upon the
occurrence and during the continuance of an Event of Default, or (ii) upon
receipt by the Holder of a Notice of Redemption.

      3.3 Mechanics of Holder's Conversion. (a) In the event that the Holder
elects to convert this Note into Common Stock, the Holder shall give notice of
such election by delivering an executed and completed notice of conversion
("NOTICE OF CONVERSION") to the Borrower and such Notice of Conversion shall
provide a breakdown in reasonable detail of the Principal Amount, accrued
interest and fees being converted. On each Conversion Date (as hereinafter
defined) and in accordance with its Notice of Conversion, the Holder shall make
the appropriate reduction to the Principal Amount, accrued interest and fees as
entered in its records and shall provide written notice thereof to the Borrower
within two (2) business days after the Conversion Date. Each date on which a
Notice of Conversion is delivered or telecopied to the Borrower in accordance
with the provisions hereof shall be deemed a Conversion Date (the "CONVERSION
DATE"). A form of Notice of Conversion to be employed by the Holder is annexed
hereto as Exhibit A.

                                        4
<PAGE>

      (b) Pursuant to the terms of the Notice of Conversion, the Borrower will
issue instructions to the transfer agent accompanied by an opinion of counsel
within one (1) business day of the date of the delivery to Borrower of the
Notice of Conversion and shall cause the transfer agent to transmit the
certificates representing the Conversion Shares to the Holder by crediting the
account of the Holder's designated broker with the Depository Trust Corporation
("DTC") through its Deposit Withdrawal Agent Commission ("DWAC") system within
three (3) business days after receipt by the Borrower of the Notice of
Conversion (the "DELIVERY DATE"). In the case of the exercise of the conversion
rights set forth herein the conversion privilege shall be deemed to have been
exercised and the Conversion Shares issuable upon such conversion shall be
deemed to have been issued upon the date of receipt by the Borrower of the
Notice of Conversion. The Holder shall be treated for all purposes as the record
holder of such Common Stock, unless the Holder provides the Borrower written
instructions to the contrary.


      3.4 Conversion Mechanics.

      (a) The number of shares of Common Stock to be issued upon each conversion
of this Note shall be determined by dividing that portion of the principal and
interest and fees to be converted, if any, by the then applicable Fixed
Conversion Price. In the event of any conversions of outstanding principal
amount under this Note in part pursuant to this Article III, such conversions
shall be deemed to constitute conversions of outstanding principal amount
applying to Monthly Amounts for the remaining Repayment Dates in chronological
order.

      (b) The Fixed Conversion Price and number and kind of shares or other
securities to be issued upon conversion is subject to adjustment from time to
time upon the occurrence of certain events, as follows:

      A. Stock Splits, Combinations and Dividends. If the shares of Common Stock
are subdivided or combined into a greater or smaller number of shares of Common
Stock, or if a dividend is paid on the Common Stock or any preferred stock
issued by the Borrower in shares of Common Stock, the Fixed Conversion Price or
the Conversion Price, as the case may be, shall be proportionately reduced in
case of subdivision of shares or stock dividend or proportionately increased in
the case of combination of shares, in each such case by the ratio which the
total number of shares of Common Stock outstanding immediately after such event
bears to the total number of shares of Common Stock outstanding immediately
prior to such event.

      B. During the period the conversion right exists, the Borrower will
reserve from its authorized and unissued Common Stock a sufficient number of
shares to provide for the issuance of Common Stock upon the full conversion of
this Note. The Borrower represents that upon issuance, such shares will be duly
and validly issued, fully paid and non-assessable. The Borrower agrees that its
issuance of this Note shall constitute full authority to its officers, agents,
and transfer agents who are charged with the duty of executing and issuing stock
certificates to execute and issue the necessary certificates for shares of
Common Stock upon the conversion of this Note.

                                        5
<PAGE>

      C. Share Issuances. Subject to the provisions of this Section 3.4, if the
Borrower shall at any time prior to the conversion or repayment in full of the
Principal Amount issue any shares of Common Stock or securities convertible into
Common Stock to a person other than the Holder (except (i) pursuant to
Subsections A or B above; (ii) pursuant to options, warrants, or other
obligations to issue shares outstanding on the date hereof as disclosed to
Holder in writing; or (iii) pursuant to options that may be issued under any
employee incentive stock option and/or any qualified stock option plan adopted
by the Borrower) for a consideration per share (the "Offer Price") less than the
Fixed Conversion Price in effect at the time of such issuance, then the Fixed
Conversion Price shall be immediately reset to such lower Offer Price at the
time of issuance of such securities For purposes hereof, the issuance of any
security of the Borrower convertible into or exercisable or exchangeable for
Common Stock shall result in an adjustment to the Fixed Conversion Price at the
time of issuance of such securities.

      D. Reclassification, etc. If the Borrower at any time shall, by
reclassification or otherwise, change the Common Stock into the same or a
different number of securities of any class or classes, this Note, as to the
unpaid Principal Amount and accrued interest thereon, shall thereafter be deemed
to evidence the right to purchase an adjusted number of such securities and kind
of securities as would have been issuable as the result of such change with
respect to the Common Stock immediately prior to such reclassification or other
change.

      3.5 Issuance of New Note. Upon any partial conversion of this Note, a new
Note containing the same date and provisions of this Note shall, at the request
of the Holder, be issued by the Borrower to the Holder for the principal balance
of this Note and interest which shall not have been converted or paid. Subject
to the provisions of Article IV, the Borrower will pay no costs, fees or any
other consideration to the Holder for the production and issuance of a new Note.

                                   ARTICLE IV
                                EVENTS OF DEFAULT

      Upon the occurrence and continuance of an Event of Default beyond any
applicable grace period, the Holder may make all sums of principal, interest and
other fees then remaining unpaid hereon and all other amounts payable hereunder
immediately due and payable. In the event of such an acceleration, the amount
due and owing to the Holder shall be 130% of the outstanding principal amount of
the Note (plus accrued and unpaid interest and fees, if any) (the "DEFAULT
PAYMENT"). The Default Payment shall be applied first to any fees due and
payable to Holder pursuant to the Note or the Related Agreements, then to
accrued and unpaid interest due on the Note and then to outstanding principal
balance of the Note.

                                        6
<PAGE>

      The occurrence of any of the following events set forth in Sections 4.1
through 4.10, inclusive, is an "EVENT OF DEFAULT":

      4.1 Failure to Pay Principal, Interest or other Fees. The Borrower fails
to pay when due any installment of principal, interest or other fees hereon in
accordance herewith, or the Borrower fails to pay when due any amount due under
any other promissory note issued by Borrower, and in any such case, such failure
shall continue for a period of three (3) days following the date upon which any
such payment was due.

      4.2 Breach of Covenant. The Borrower breaches any covenant or any other
term or condition of this Note or the Purchase Agreement in any material
respect, or the Borrower or any of its Subsidiaries breaches any covenant or any
other term or condition of any Related Agreement in any material respect and, in
any such case, such breach, if subject to cure, continues for a period of
fifteen (15) days after the occurrence thereof.

      4.3 Breach of Representations and Warranties. Any representation or
warranty made by the Borrower in this Note or the Purchase Agreement, or by the
Borrower or any of its Subsidiaries in any Related Agreement, shall, in any such
case, be false or misleading in any material respect on the date that such
representation or warranty was made or deemed made.

      4.4 Receiver or Trustee. The Borrower or any of its Subsidiaries shall
make an assignment for the benefit of creditors, or apply for or consent to the
appointment of a receiver or trustee for it or for a substantial part of its
property or business; or such a receiver or trustee shall otherwise be
appointed.

      4.5 Judgments. Any money judgment, writ or similar final process shall be
entered or filed against the Borrower or any of its Subsidiaries or any of their
respective property or other assets for more than $50,000, and shall remain
unvacated, unbonded or unstayed for a period of thirty (30) days.

      4.6 Bankruptcy. Bankruptcy, insolvency, reorganization or liquidation
proceedings or other proceedings or relief under any bankruptcy law or any law
for the relief of debtors shall be instituted by or against the Borrower or any
of its Subsidiaries.

      4.7 Stop Trade. An SEC stop trade order or Principal Market trading
suspension of the Common Stock shall be in effect for five (5) consecutive days
or five (5) days during a period of ten (10) consecutive days, excluding in all
cases a suspension of all trading on a Principal Market, provided that the
Borrower shall not have been able to cure such trading suspension within thirty
(30) days of the notice thereof or list the Common Stock on another Principal
Market within sixty (60) days of such notice. The "Principal Market" for the
Common Stock shall include the NASD OTC Bulletin Board, NASDAQ SmallCap Market,
NASDAQ National Market System, American Stock Exchange, or New York Stock
Exchange (whichever of the foregoing is at the time the principal trading
exchange or market for the Common Stock).

                                        7
<PAGE>

      4.8 Failure to Deliver Common Stock or Replacement Note. The Borrower
shall fail (i) to timely deliver Common Stock to the Holder pursuant to and in
the form required by this Note, and Section 9 of the Purchase Agreement, if such
failure to timely deliver Common Stock shall not be cured within two (2)
business days or (ii) to deliver a replacement Note to Holder within seven (7)
business days following the required date of such issuance pursuant to this
Note, the Purchase Agreement or any Related Agreement (to the extent required
under such agreements).

      4.9 Default Under Related Agreements or Other Agreements. The occurrence
and continuance of any Event of Default (as defined in the Purchase Agreement or
any Related Agreement) or any event of default (or similar term) under any other
indebtedness.

      4.10 Change in Control. The occurrence of a change in the controlling
ownership of the Borrower.

                           DEFAULT RELATED PROVISIONS

      4.11 Default Interest Rate. Following the occurrence and during the
continuance of an Event of Default, the Borrower shall pay additional interest
on this Note in an amount equal to two percent (2%) per month, and all
outstanding obligations under this Note, including unpaid interest, shall
continue to accrue such additional interest from the date of such Event of
Default until the date such Event of Default is cured or waived.

      4.12 Conversion Privileges. The conversion privileges set forth in Article
III shall remain in full force and effect immediately from the date hereof and
until this Note is paid in full.

      4.13 Cumulative Remedies. The remedies under this Note shall be
cumulative.

                                    ARTICLE V
                                  MISCELLANEOUS

      5.1 Failure or Indulgence Not Waiver. No failure or delay on the part of
the Holder hereof in the exercise of any power, right or privilege hereunder
shall operate as a waiver thereof, nor shall any single or partial exercise of
any such power, right or privilege preclude other or further exercise thereof or
of any other right, power or privilege. All rights and remedies existing
hereunder are cumulative to, and not exclusive of, any rights or remedies
otherwise available.

      5.2 Notices. Any notice herein required or permitted to be given shall be
in writing and shall be deemed effectively given: (a) upon personal delivery to
the party notified, (b) when sent by confirmed telex or facsimile if sent during
normal business hours of the recipient, if not, then on the next business day,
(c) five days after having been sent by registered or certified mail, return
receipt requested, postage prepaid, or (d) one day after deposit with a
nationally recognized overnight courier, specifying next day delivery, with
written verification of receipt. All communications shall be sent to the
Borrower at the address provided in the Purchase Agreement executed in
connection herewith, and to the Holder at the address provided in the Purchase
Agreement for such Holder, with a copy to John E. Tucker, Esq., 825 Third
Avenue, 14th Floor, New York, New York 10022, facsimile number (212) 541-4434,
or at such other address as the Borrower or the Holder may designate by ten days
advance written notice to the other parties hereto. A Notice of Conversion shall
be deemed given when made to the Borrower pursuant to the Purchase Agreement.

                                        8
<PAGE>

      5.3 Amendment Provision. The term "Note" and all reference thereto, as
used throughout this instrument, shall mean this instrument as originally
executed, or if later amended or supplemented, then as so amended or
supplemented, and any successor instrument issued pursuant to Section 3.5
hereof, as it may be amended or supplemented.

      5.4 Assignability. This Note shall be binding upon the Borrower and its
successors and assigns, and shall inure to the benefit of the Holder and its
successors and assigns, and may be assigned by the Holder in accordance with the
requirements of the Purchase Agreement. This Note shall not be assigned by the
Borrower without the consent of the Holder.

      5.5 Governing Law. This Note shall be governed by and construed in
accordance with the laws of the State of New York, without regard to principles
of conflicts of laws. Any action brought by either party against the other
concerning the transactions contemplated by this Agreement shall be brought only
in the state courts of New York or in the federal courts located in the State of
New York. Both parties and the individual signing this Note on behalf of the
Borrower agree to submit to the jurisdiction of such courts. The prevailing
party shall be entitled to recover from the other party its reasonable
attorney's fees and costs. In the event that any provision of this Note is
invalid or unenforceable under any applicable statute or rule of law, then such
provision shall be deemed inoperative to the extent that it may conflict
therewith and shall be deemed modified to conform with such statute or rule of
law. Any such provision which may prove invalid or unenforceable under any law
shall not affect the validity or enforceability of any other provision of this
Note. Nothing contained herein shall be deemed or operate to preclude the Holder
from bringing suit or taking other legal action against the Borrower in any
other jurisdiction to collect on the Borrower's obligations to Holder, to
realize on any collateral or any other security for such obligations, or to
enforce a judgment or other court in favor of the Holder.

      5.6 Maximum Payments. Nothing contained herein shall be deemed to
establish or require the payment of a rate of interest or other charges in
excess of the maximum permitted by applicable law. In the event that the rate of
interest required to be paid or other charges hereunder exceed the maximum
permitted by such law, any payments in excess of such maximum shall be credited
against amounts owed by the Borrower to the Holder and thus refunded to the
Borrower.

      5.7 Security Interest and Guarantee. The Holder has been granted a
security interest (i) in certain assets of the Borrower and its Subsidiaries as
more fully described in the Master Security Agreement dated as of the date
hereof and (ii) pursuant to the Stock Pledge Agreement dated as of the date
hereof. The obligations of the Borrower under this Note are guaranteed by
certain Subsidiaries of the Borrower pursuant to the Subsidiary Guaranty dated
as of the date hereof.

                                        9
<PAGE>

      5.8 Construction. Each party acknowledges that its legal counsel
participated in the preparation of this Note and, therefore, stipulates that the
rule of construction that ambiguities are to be resolved against the drafting
party shall not be applied in the interpretation of this Note to favor any party
against the other.

      5.9 Cost of Collection. If default is made in the payment of this Note,
the Borrower shall pay to Holder reasonable costs of collection, including
reasonable attorney's fees.



       [Balance of page intentionally left blank; signature page follows.]






                                       10
<PAGE>

      IN WITNESS WHEREOF, the Borrower has caused this Amended and Restated
Convertible Term Note to be signed in its name effective as of the 11th day of
February, 2005.


                                                 SCIENCE DYNAMICS CORPORATION


                                                 By:    /s/ Paul Burgess
                                                        -----------------------
                                                 Name:  Paul Burgess
                                                        -----------------------
                                                 Title: Chief Executive Officer
                                                        -----------------------

WITNESS:


-------------------------------






                                       11
<PAGE>

                                    EXHIBIT A

                              NOTICE OF CONVERSION

(To be executed by the Holder in order to convert all or part of the Note into
Common Stock

[Name and Address of Holder]


The Undersigned hereby converts $_________ of the principal due on [specify
applicable Repayment Date] under the Amended and Restated Convertible Term Note
issued by SCIENCE DYNAMICS CORPORATION dated February 11, 2005 and amended and
restated as of June __, 2006 by delivery of Shares of Common Stock of SCIENCE
DYNAMICS CORPORATION on and subject to the conditions set forth in Article III
of such Note.


1.    Date of Conversion          _______________________

2.    Shares To Be Delivered:     _______________________


                                             By:____________________________
                                             Name:__________________________
                                             Title:_________________________




                                       12