<PAGE>   1
                                EXHIBIT 10(b)(15)
                                                                     68003/90066

                                PROMISSORY NOTE
                           (REVOLVING LINE OF CREDIT)


$12,500,000.00                    Dallas, Texas                   March 12, 1997


       FOR VALUE RECEIVED, TECNOL MEDICAL PRODUCTS, INC., a Delaware
corporation (herein called "Borrower") hereby promises to pay to the order of
NATIONSBANK OF TEXAS, N.A., a national banking association ("Bank") at its
banking house in the City of Dallas, Dallas County, Texas, the principal sum of
TWELVE MILLION FIVE HUNDRED THOUSAND DOLLARS ($12,500,000.00), or for much
thereof as may be advanced, together with interest on the unpaid principal
balance of this Note from day to day outstanding, as hereinafter provided.

       1.     Definitions.  When used in this Note, the following terms shall
have the following meanings:

       "Business Days" means any day other than a Saturday, Sunday or other day
       on which commercial banks are open for business in Dallas, Texas.

       "CD Interest Period" means, with respect to any CD Rate Election:

                     (a)    initially, the period commencing on the date such
              CD Rate Election is made and ending thirty, ninety, one hundred
              eighty or three hundred sixty days thereafter as selected by
              Borrower, and

                     (b)    thereafter, each period commencing on the day
              following the last day of the next preceding CD Interest Period
              applicable to such CD Rate Election and in each case ending
              thirty, ninety, one hundred eighty, or three hundred sixty days
              thereafter, as selected by Borrower;

       provided, however, that (i) if any CD Interest Period would end on a day
       that is not a Business Day, such CD Interest Period shall be extended to
       the next succeeding Business Day, and (ii) if any CD Interest Period
       would otherwise end after the Maturity Date, such CD Interest Period
       shall end on the Maturity Date.

       "CD Margin" means one percent (1%) per annum.

       "CD Quoted Rate" means, with respect to any CD Interest Period, the rate
       of interest per annum determined by Bank (in accordance with its
       customary practices) to be





3/12/97
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       the rate per annum offered to Bank at approximately 9:00 a.m. (Dallas,
       Texas time) on the first day of such CD Interest Period for the purchase
       at face value of a domestic certificate of deposit from Bank in an
       amount equal or comparable to the principal amount of the corresponding
       CD Rate Election as of such first day and for a period of time equal or
       comparable to the length of such CD Interest Period.

       "CD Rate" means, for each CD Rate Election, the rate per annum (rounded
       upward if necessary, to the nearest 1/10 of 1%) determined by Bank to be
       equal to the sum of (i) the quotient of (a) the CD Quoted Rate for such
       CD Rate Election for such CD Interest Period divided by (b) 1 minus the
       CD Reserve Requirement; plus (2) the FDIC Percentage; plus (3) the CD
       Margin, all as per the following formula:

<TABLE>
              <S>                            <C>                      <C>
                      CD Quoted Rate         +       FDIC       +        CD
              ---------------------------         Percentage           Margin
              1 - CD Reserve Requirement          
</TABLE>

       "CD Reserve Requirement" means, for any CD Rate Election, for any CD
       Interest Period therefor, the daily average of the stated maximum rate
       (expressed as a decimal) at which reserves (including any marginal,
       supplemental, or emergency reserves) are required to be maintained
       during such CD Interest Period under Regulation D by member banks of the
       Federal Reserve System in Dallas with deposits exceeding $1,000,000,000
       against new non-personal dollar time deposits in the amount of $100,000
       or more and with a maturity comparable to the CD Interest Period for
       such CD Rate Election.  Without limiting the effect of the foregoing,
       the CD Reserve Requirement shall reflect any other reserves required to
       be maintained by Bank against (a) any category of liabilities that
       includes deposits by reference to which the CD Rate for CD Rate
       Elections is to be determined, or (b) any category of extension of
       credit or other assets that include CD Rate Elections.

       "CD Rate Election" means an election by Borrower, as hereinafter
       provided, to cause a portion of the Loan to be segregated into a
       separate account and to bear interest at the CD Rate rather than the
       Stated Rate for the term of the Election.

       "Default Rate" means, on any day, a rate per annum equal to the Stated
       Rate plus five percent (5%) per annum computed using the 365/360 method
       described below.

       "Election" means a CD Rate Election or a Libor Rate Election.

       "Event of Default" means (a) any principal, interest or other amount of
       money due under this Note is not paid in full when due, regardless of
       how much amount may have become due and such failure continues beyond
       any notice and grace period set forth in Section 7.1 of the Loan
       Agreement; or (b) the occurrence of any Event of Default under the Loan
       Agreement; or (c) the occurrence of any default or event of default
       under Bank's $5,000,000.00 loan to Anago Incorporated and assumed by
       Tecnol, Inc. pursuant to a Consent and Assumption Agreement dated June
       30, 1994





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       as amended and restated by an Amended and Restated Promissory Note dated
       July 1, 1994 in the stated principal amount of $4,500,000 or any
       documents evidencing, governing, securing, guaranteeing or otherwise
       pertaining to such loan.

       "FDIC Percentage" means the net assessment rate (expressed as a
       percentage rounded to the next highest .01 of 1%) that is in effect on
       any day (under the regulations of the Federal Deposit Insurance
       Corporation or any successor agency) for determining assessments paid by
       Bank to the Federal Deposit Insurance Corporation (or any successor
       agency) for insuring time deposits made in dollars at Bank's principal
       offices in Dallas, Texas.

       "Libor Lending Office" means the office designated by Bank as its "Libor
       Lending Office" or such other office of Bank or any of its affiliates
       hereafter designated by notice to Borrower.

       "Libor Margin" means one percent (1%) per annum.

       "Libor Rate" means a simple per annum interest rate equal to the sum of
       the Libor Rate Basis plus the Libor Margin.  The Libor Rate shall, with
       respect to Libor Advances subject to reserve or deposit requirements
       imposed by any governmental or regulatory authority, be subject to
       premiums assessed therefor by Bank, which are payable directly to Bank.
       Once determined, the Libor Rate shall remain unchanged during the
       applicable Libor Rate Interest Period.

       "Libor Rate Basis" means, for any Libor Rate Interest Period, the
       interest rate per annum (rounded upward to the nearest 1/16th of one
       percent) determined by Bank at approximately 9:00 a.m., on the date
       which is three Business Days before the first day of such Libor Rate
       Interest Period to be the offered quotations that appear on the Reuter's
       Screen LIBO page for dollar deposits in the London interbank market for
       a length of time approximately equal to the Libor Rate Interest Period
       for the Libor Rate Election sought by Borrower.  If at least two such
       offered quotations appear on the Reuter's Screen LIBO page, the Libor
       Rate shall be the arithmetic mean (rounded upward to the nearest 1/16th
       of one percent) of such offered quotations, as determined by Bank.  If
       the Reuter's Screen LIBO page is not available or has been discontinued,
       the Libor Rate Basis shall be the rate per annum that Bank determines to
       be the arithmetic mean (rounded as aforesaid) of the per annum rates of
       interest at which deposits in dollars in an amount approximately equal
       to the principal amount of, and for a length of time approximately equal
       to the Libor Rate Interest Period for, the Libor Rate Election sought by
       Borrower are offered to Bank in immediately available funds in the
       London interbank market at 11:00 a.m., London time, on the date which is
       three Business Days prior to the first day of a Libor Rate Interest
       Period.





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       "Libor Rate Election" means an election by Borrower, as hereinafter
       provided, to cause a portion of the previously advanced proceeds of the
       Loan to be segregated into a separate account and bear interest at the
       Libor Rate, rather than the Stated Rate for the term of the Election.

       "Libor Rate Interest Period" means, with respect to any Libor Rate
       Election, the period commencing on the date such Libor Rate Election is
       effective and ending not less than one month, three months, six months,
       or twelve months thereafter, as selected by Borrower; provided, however,
       that (i) if any Libor Rate Interest Period would end on a day that is
       not a Business Day, such Libor Interest Rate Period shall be extended to
       the next succeeding Business Day, and (ii) if any Libor Rate Interest
       Period would otherwise end after the Maturity Date, such Libor Interest
       Rate Period shall end on the Maturity Date.

       "Loan" means the loan evidenced by this Note.

       "Loan Agreement" means that certain Third Amended and Restated Loan
       Agreement dated as of November 15, 1993 among Bank and Borrower
       governing, among other things, disbursements of proceeds of the Loan and
       certain other loans from Bank to Borrower, as it may have been or may be
       amended, restated, modified or supplemented from time to time,
       including, but not limited to, the Modification Agreement dated as of
       July 1, 1994, the Modification Agreement dated March 15, 1995, the
       Second 1995 Modification Agreement dated May 8, 1995, the Third 1995
       Modification Agreement dated as of December 5, 1996, and the First 1995
       Modification Agreement dated as of March 13, 1996, and the First 1997
       Modification Agreement dated of even date herewith.

       "Loan Documents" has the same meaning in this Note as is given to such
       term in the Loan Agreement.

       "Matching Funds Election" means a CD Rate Election or a Libor Rate
       Election.

       "Matching Funds Principal" means the portion of the proceeds of the Loan
       previously advanced to Borrower which is segregated into a separate
       account pursuant to an effective Matching Funds Election.

       "Maximum Rate" means the maximum nonusurious rate of interest per annum
       permitted by whichever of applicable United States federal law or Texas
       law permits the higher interest rate, including to the extent permitted
       by applicable law, any amendments thereof hereafter or any new law
       hereafter coming into effect to the extent a higher Maximum Rate is
       permitted thereby.  To the extent, if any, that Chapter One ("Chapter
       One") of Title 79, Texas Revised Civil Statutes, 1925, as amended (the
       "Texas Credit Code") establishes the Maximum Rate, the Maximum Rate
       shall be the "indicated rate ceiling" (as defined in Chapter One) in
       effect from





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       time to time.  The Maximum Rate shall be applied by taking into account
       all amounts characterized by applicable law as interest on the debt
       evidenced by this Note, so that the aggregate of all interest does not
       exceed the maximum nonusurious amount permitted by applicable law.

       "Prime Rate" means, on any day, the rate of interest per annum then most
       recently established by Bank as its "prime rate."  Such rate is set by
       Bank as a general reference rate of interest, taking into account such
       factors as Bank may deem appropriate, it being understood that it is not
       necessarily the lowest or best rate actually charged to any customer or
       a favored rate, that it may not correspond with future increases or
       decreases in interest rates charged by other lenders or market rates in
       general and that Bank may make various business or other loans at rates
       of interest having no relationship to such rate.

       "Prior Note" means the Promissory Note (Revolving Line of Credit) dated
       March 13, 1996 executed by Borrower, payable to the order of Bank and in
       the stated principal amount of $10,000,000.

       "Regulation D" means Regulation D of the Board of Governors of the
       Federal Reserve System as amended or supplemented from time to time.

       "Stated Rate" means, on any day, a variable rate per annum equal to the
       Prime Rate for that day computed using the 365/360 method described
       below provided, that if on any day the Stated Rate shall exceed the
       maximum permitted by application of the Maximum Rate in effect on that
       day, the Stated Rate shall be fixed at the maximum permitted by
       application of the Maximum Rate on that day and on each day thereafter
       until the total amount of interest accrued at the Stated Rate on the
       unpaid balance of this Note equals the total amount of interest which
       would have accrued if there were no limitation by the Maximum Rate and
       the Stated Rate had not been so fixed, or until the earlier payment in
       full of this Note.

       "Stated Rate Loans" means, that portion of the principal balance this
       Note bearing interest at the Stated Rate prior to an Event of Default or
       maturity.

       2.     Maturity Date.  The entire principal balance of this Note then
unpaid together with all accrued and unpaid interest hereon shall be due and
payable on March 13, 1998 (the "Maturity Date").

       3.     Advances.  This Note is a revolving promissory note evidencing a
revolving line of credit, not to exceed $12,500,000.00 at any one time
outstanding.  While the aggregate of all advances under this Note may exceed
$12,500,000.00, the outstanding balance of this Note at any one time shall not
exceed $12,500,000.00.  Before the Maturity Date, Borrower may borrow, repay
and borrow principal amounts again up to $12,500,00.00, subject to the





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<PAGE>   6
terms of this Note and Loan Agreement.  Advances shall be made in accordance
with the terms of the Loan Agreement.

       4.     Interest Rate(s).  As hereinafter provided, prior to default or
maturity, the principal balance of this Note may be segregated into separate
accounts and shall bear interest as follows:

              (a)    So much of the principal balance of this Note as is not
       from time to time subject to an effective Election shall constitute one
       account (the "Stated Rate Account") and shall bear interest prior to the
       occurrence of an Event of Default or maturity at the lesser of: (a) the
       Maximum Rate, or (b) the Stated Rate.

              (b)    Each portion of the principal balance hereof which may
       from time to time be subject to an effective CD Rate Election shall
       constitute a separate account (the "CD Funds Account") and shall bear
       interest prior to the occurrence of an Event of Default or maturity at
       the lesser of: (a) the Maximum Rate, or (b) the CD Rate applicable to
       such Election.

              (c)    Each portion of the principal balance hereof, which may
       from time to time be subject to an effective Libor Rate Election shall
       constitute a separate account (the "Libor Rate Account") and shall bear
       interest prior to an Event of Default or maturity at the lesser of:  (a)
       the Maximum Rate, or (b) the Libor Rate applicable to such Election.

       5.     Past Due Interest.  After the earlier of an Event of Default on
the Maturity Date, the entire unpaid principal balance of and to the extent
permitted by applicable law any interest on, this Note shall bear interest at a
varying rate per annum equal to the lesser of (a) the Maximum Rate, or (b) the
Default Rate.

       6.     365/360 Method; Rate Fluctuations.  Subject always to limitation
by the Maximum Rate, interest on this Note at the Stated Rate and the Default
Rate shall be calculated on the basis of the 365/360 method, which computes a
daily amount of interest for a hypothetical year of 360 days, then multiplies
such amount by the actual number of days elapsed in an interest calculation
period.  Without notice to Borrower or anyone else, the Prime Rate and the
Maximum Rate shall each automatically fluctuate upward and downward as and in
the amount by which Bank's prime rate and such maximum nonusurious rate of
interest permitted by applicable law, respectively, fluctuate, subject always
to limitation of the Stated Rate and the Default Rate by the Maximum Rate.

       7.     Interest Periods.  The term "Interest Period" as used in this
Note means the time from and including the first (1st) day of each calendar
month (each such date being called a "Payment Date") through the end of the day
before the next occurring Payment Date, except that (a) the first Interest
Period is the period from and including the day the first proceeds of this Note
are disbursed through the end of the day before the first





                                      -6-
<PAGE>   7
occurring Payment Date and (b) the last Interest Period is the period from and
including the day after the end of the next-to-last Interest Period through the
end of the day before the maturity of this Note (whether resulting from demand
for payment, the passage of time, acceleration for default, or any permitted
prepayment).  The interest accruing prior to the occurrence of an Event of
Default or maturity on the Stated Rate Account shall be calculated by first
determining the amount of interest on the unpaid principal balance of the
Stated Rate Account from time to time outstanding at the Stated Rate in effect
from time to time from the date hereof through the end of each Interest Period
(or, if the Note has matured, through the end of the day before maturity), then
deducting any interest previously paid on the Stated Rate Account to determine
the amount of interest then payable; provided, however, that the total interest
payable on the Stated Rate Account through the end of each Interest Period and
at maturity shall not exceed the maximum amount of interest that may be
lawfully charged on the Stated Rate Account from the date hereof through such
date.  The interest accruing prior to the occurrence of an Event of Default or
maturity on the principal balance of each Matching Funds Account shall be
calculated by determining the amount of interest on the unpaid principal
balance of such Matching Funds Account from time to time outstanding at the
Matching Funds Rate applicable to such Matching Funds Account in effect from
time to time (which Matching Funds Rate shall never exceed the maximum lawful
rate applicable thereto), and such interest shall be payable at the times and
in the manner as herein provided for the Stated Rate Account.

       8.     Interest Payments.  Interest for each Interest Period during the
term of this Note shall be calculated as of the end of such Interest Period
and, except as hereinafter expressly provided to the contrary, shall be payable
on or before the first day of the following Interest Period and, in the case of
the last Interest Period, at maturity.  Whenever any payment shall be due under
this Note on a day which is not a Business Day, the date on which such payment
is due shall be extended to the next succeeding Business Day, and such
extension of time shall be included in the computation of the amount of
interest then payable.  All principal, interest and other sums payable under
this Note shall be paid, not later than 2:00 o'clock p.m. (Dallas, Texas time)
on the day when due, in immediately available funds in lawful money of the
United States of America.  Any payment under this Note or under any other Loan
Document other than in the required amount in good, unrestricted U.S. funds
immediately available to the holder hereof shall not, regardless of any receipt
or credit issued therefor, constitute payment until the required amount is
actually received by the holder hereof in such funds and shall be made and
accepted subject to the condition that any check or draft may be handled for
collection in accordance with the practice of the collecting bank or banks.

       9.     Application of Payments.  All payments made as scheduled on this
Note shall be applied, to the extent thereof, first to accrued but unpaid
interest and the balance to unpaid principal.  All prepayments on this Note
made prior to an Event of Default shall be applied, to the extent thereof,
first to accrued but unpaid interest and the balance to the remaining principal
installments in inverse order of their maturity.  Nothing herein shall limit or
impair any rights of the holder hereof to apply any past due payments, any
proceeds from





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the disposition of any collateral by foreclosure or other collections after an
Event of Default to the amounts owing hereunder in such manner as Bank shall
elect.  Except to the extent specific provisions are set forth in this Note or
another Loan Document with respect to application of payments, all payments
received by the holder hereof shall be applied in such order and manner as the
holder hereof shall deem appropriate, any instructions from Borrower or anyone
else to the contrary notwithstanding.

       10.    Matching Funds Election.  From time to time during the term of
the Loan, so long as no Event of Default has occurred and is continuing,
Borrower may elect to cause a portion or portions of the Loan proceeds
previously disbursed to Borrower, which portions must be at least $500,000.00
each, to bear interest at the CD Rate or the Libor Rate, as applicable, rather
than the Stated Rate; provided, however, that Borrower may not exercise a
Matching Funds Election at any time when the applicable Matching Funds Rate
would exceed the maximum lawful rate of interest applicable to the Loan.  Upon
the effective date of each Election, the portion of the Loan proceeds as to
which the Election is exercised shall be segregated into a separate account
(the CD Funds Account or the Libor Rate, as the case may be) and shall bear
interest prior to the occurrence of an Event of Default or maturity from the
effective date of the Election to the end of the term CD Interest Period or
Libor Rate Interest Period, as applicable, at the CD Rate or the Libor Rate, as
applicable, in effect on the effective date of the Election; provided that CD
Rates shall be adjusted from time to time during the term of any CD Rate
Election to account for any fluctuations in the CD Reserve Requirement,
insurance, fees, assessments and surcharges, and the Libor Rate, as applicable,
shall be adjusted from time to time during the term of any Libor Rate Election,
as applicable, to account for fluctuations in reserve percentages, insurance,
fees, assessments and surcharges.

       11.    Exercise of Elections.  Borrower shall inform Bank when Borrower
wishes to exercise a Matching Funds Election, specifying a CD Rate Election or
a Libor Rate Election is requested, and Bank shall advise Borrower of the
Matching Funds Rate applicable to such Election and the periods for which
Borrower may exercise such Election.  To exercise a CD Rate Election, Borrower
shall advise Bank of (a) the amount of the Matching Funds Principal as to which
Borrower wishes to exercise such CD Rate Election, and (b) the desired term of
such CD Rate Interest Period. A CD Rate Election shall become effective three
(3) Business Days following the date of Borrower's advising Bank of the
particular terms of the CD Rate Election.  To exercise a Libor Rate Election,
Borrower shall advise Bank of (a) the amount of the Matching Funds Principal as
to which Borrower wishes to exercise such a Libor Rate Election, and (b) the
desired term of such Libor Rate Interest Period.  A Libor Rate Election shall
be effective three (3) Business Days following the date of Borrower's advising
Bank of the particular terms of the Libor Rate Election.  On or before the
effective date of each Election, Borrower shall execute and deliver to Bank a
written confirmation of (a) the amount of the Matching Funds Principal subject
to the Election, (b) the term of the Election, and (c) the initial Matching
Funds Rate applicable to such Election.





                                      -8-
<PAGE>   9
       12.    Extension of Elections.      Borrower may not extend a Matching
Funds Election beyond the original term thereof at the Matching Funds Rate
applicable during the original term.  However, at the end of the term of a
Matching Funds Election, Borrower may make an additional Matching Funds
Election to cause the Matching Funds Principal subject to the expired Election
to bear interest at the Matching Funds Rate applicable on the day after the
expiration of the prior Election for the term of the new Election by so
advising Bank three (3) Business Days before the expiration of a CD Rate
Election or Libor Rate Election, as applicable, and Bank shall advise Borrower
of the Matching Funds Rate available to Borrower for such new Election, and
Borrower shall give to Bank a written confirmation by the effective date of the
new Election in the manner specified in the preceding paragraph, accompanied by
the payment of any additional fee required by this Note.  Otherwise, upon the
expiration of the prior Election, the Matching Funds Principal subject to the
expired Election shall be returned to the same account as the Loan proceeds
which bear interest at the Stated Rate and shall again bear interest prior to
the occurrence of an Event of Default or maturity at the Stated Rate.

       13.    Change of Law; Impracticability of Election.  Notwithstanding any
other provision of this Note, if: (a) any change in applicable law, rule or
regulation or in the interpretation or administration thereof shall make it
unlawful for Bank to issue certificates of deposit or impair or restrict Bank's
ability to do so for terms and at rates which would permit Bank to respond to a
Matching Funds Election by obtaining funds at the CD Rate, or the Libor Rate,
as applicable, or (b) deposits in funds in the applicable amounts against which
Bank is to match Matching Funds Principal in connection with an Election are
not being offered generally to Bank in the relevant market for the applicable
period, or (c) the CD Rate or the Libor Rate, as applicable, will not
accurately and fairly reflect the cost to Bank of funding a CD Rate Election or
Libor Rate Election, as applicable, then, in the case of (a),(b) or (c) above,
any of the foregoing instances, Borrower's right to make any further Matching
Funds Elections or to continue any Matching Funds Election then in force shall
be suspended for the duration of such illegality or impairment or restriction.
If Bank makes such determination, it shall promptly notify Borrower in writing,
and Borrower shall either repay the outstanding Matching Funds Election owed to
Bank, without penalty, within thirty (30) days or convert the same to Stated
Rate Loans within thirty (30) days.  So long as Bank has given Borrower the
notice required by the preceding sentence, Borrower shall indemnify and hold
harmless Bank against all costs, claims, penalties, liabilities and damages
which may result from any such change in law, rule, regulation, interpretation
or administration.

       14.    Limitation on Matching Funds Interest.  It is expressly
understood that all provisions of this Note, including but not limited to the
provisions regarding the charging of interest at a Matching Funds Rate for the
term of a Matching Funds Election, are subject to the provisions hereof
limiting the amount of interest contracted for, charged, or collected hereunder
to the maximum amount permitted under applicable law.

       15.    Prepayment.   Except as otherwise specifically  provided in this
Note, Borrower shall have the right to prepay the outstanding principal balance
of this Note, in full at any





                                      -9-
<PAGE>   10
time or in part from time to time without premium or penalty, provided, that as
conditions precedent to Borrower's right to make, and Bank's obligations to
accept, any such prepayment for any portion of the principal balance of this
Note subject to a Matching Funds Election: (i) Bank shall have actually
received from Borrower at least five (5) business days' prior written notice of
Borrower's intent to prepay, of the amount of principal which will be prepaid
(the "Prepaid Principal") and of the date (the "Prepayment Date") on which the
prepayment will be made; (ii) each prepayment of principal shall be in the
amount of $50,000 or a larger multiple of $1,000.00 (unless the prepayment
retires the outstanding balance of this Note in full); (iii) each such
prepayment shall be in the amount of 100% of the principal amount to be
prepaid, plus accrued unpaid interest thereon to the Prepayment Date, plus any
other sums which have become due to Bank under the Loan Documents on or before
the Prepayment Date but have not been paid; and (iv) plus if any portion of
this Note subject to a Matching Funds Election is prepaid, the Make-Whole
Amount (hereinafter defined) if the Treasury Rate (hereinafter defined) plus
the Closing Spread (hereinafter defined) is less than per annum interest rate
of the Matching Fund Principal being prepaid (the "Loan Interest Rate"), except
as provided in Section 2.4 of the Loan Agreements.

       The "Make-Whole Amount" shall equal (i) the sum of the amounts
calculated by discounting the Remaining Scheduled Payments (hereinafter
defined) from their respective scheduled due dates to the Prepayment Date, in
accordance with accepted financial practice at a discount factor equal to the
Treasury Rate plus the Closing Spread, less (ii) the Prepaid Principal; but the
Make-Whole Amount shall in no event be less than zero and nothing herein shall
be construed or operate to require Borrower to pay a Make-Whole Amount except
in connection with Borrower's exercise of the right to prepay granted above or
to pay any amount greater than is permitted by applicable law.

       If a Make-Whole Amount will be due, Bank shall notify Borrower of the
amount and basis of determination of the Make-Whole Amount.

       For the purposes of determining the Make-Whole Amount, the following
terms shall have the following meanings:

              The "Treasury Rate" is the yield on the Treasury Constant
              Maturity Series with maturity equal to the remaining weighted
              average life to maturity of the Remaining Scheduled Payments
              which are principal payments (calculated as of the Prepayment
              Date in accordance with accepted financial practice and rounded
              to the nearest quarter-year), as reported in Federal Reserve
              Statistical Release H.15 (519) - Selected Interest Rates, in the
              "This Week" column of the issue which, as of the fifth business
              day before the Prepayment Date, has been most recently published.
              If no maturity exactly corresponding to such remaining weighted
              average life to maturity appears in Release H.15, the Treasury
              Rate will be determined by liner interpolation between the yields
              reported in Release H.15.  If for any reason Release H.15 is not
              longer





                                      -10-
<PAGE>   11
              published, Bank shall select a comparable publication to
              determine the Treasury Rate.

              The "Remaining Scheduled Payments" are (i) each scheduled payment
              of principal of this Note which is, or to the extent that it is,
              paid before its scheduled due date by application of the Prepaid
              Principal [in inverse order of maturity of installments of
              principal] in accordance with this Note; and (ii)  each scheduled
              payment of interest on the Prepaid Principal that would be due in
              accordance with this Note after the Prepayment Date if no payment
              of the Prepaid Principal were made prior to its scheduled due
              date(s).

              The "Closing Spread" is the difference between the Loan Interest
              Rate and the Treasury Rate with such Treasury Rate being
              calculated as of the date of this Note, as if the principal face
              amount of this Note were the Prepaid Principal and the date of
              this Note were the Prepayment Date.

       Borrower agrees that Bank shall not be obligated actually to reinvest
the amount prepaid in any Treasury obligations as a condition to receiving the
Make-Whole Amount or otherwise.  All prepayments of principal shall be applied
to principal in inverse order of maturity.

       16.    Reimbursement of Losses Arising from Deviations in Payment of
Matching Funds Elections.  If Borrower makes any payment of principal with
respect to any CD Rate Election or Libor Rate Election on any day other than
the last day of an Election or if Borrower fails to convert any portion of the
Loan bearing interest at the Stated Rate to a CD Rate Election or Libor Rate
Election after notice has been given to Bank in accordance with the terms
hereof, Borrower shall reimburse Bank on demand for any resulting loss or
expense incurred by Bank (or by any existing or prospective participant in the
related CD Rate Election or Libor Rate Election), including, without
limitation, any loss incurred in obtaining, liquidating, or redeploying
deposits from third parties, but excluding loss of margin for the period after
any such payment or failure to borrow, provided that Bank shall have delivered
to Borrower a certificate as to the amount of such loss or expense and the
basis for determining such amount.  Determinations by Bank of amounts due under
this Section 16 shall be conclusive, absent manifest error.

       17.    Reserve Requirements.  In the event of any change in any
applicable law, treaty, or regulation or in the interpretation or
administration thereof or in the event any central bank or other fiscal
monetary or other authority having jurisdiction over Bank or the Loan
contemplated by this Note imposes, modifies, or deems applicable to any CD Rate
Elections or Libor Rate Elections any reserve requirement of the Board of
Governors of the Federal Reserve System or any other reserve, special deposit,
or similar requirements against assets of, deposits with or for the account of,
or credit extended by, Bank, or imposes on Bank any other condition affecting
this Note or the CD Rate Elections or Libor Rate Elections and the result of
any of the foregoing is to increase the cost to Bank in making or





                                      -11-
<PAGE>   12
maintaining its CD Rate Elections or Libor Rate Elections or to reduce any
amount (or the effective return on any amount) received by Bank hereunder, then
Borrower shall pay to Bank upon demand of Bank as additional interest on this
Promissory Note such additional amount or amounts as Bank may determine as will
reimburse Bank for such additional cost or such reduction.  Upon becoming aware
of any such change or imposition that may result in any such increase or
reduction, Bank shall give written notice to Borrower thereof together with
certificate of Bank setting forth the amount necessary to compensate Bank as
aforesaid and the basis for the determination of such amount and Borrower
shall, within thirty (30) days, either (i) promptly pay such amount, (ii)
convert such Matching Funding Election to a Stated Rate Loan, or (iii) prepay
the Matching Funds Election without penalty.  Determinations made by Bank for
purposes of this Section 17 of the effect of any such change in its costs of
making or maintaining its Matching Funds Elections or on amounts receivable by
it in respect or such Matching Funds Elections and of the additional amounts
required to compensate Bank in respect thereof shall be conclusive, absent
manifest error.

       18.    Taxes.  If any taxes are levied or imposed on or with respect to
the CD Funds Account and/or the Libor Rate Account or on any payment on the CD
Funds Account and/ or the Libor Rate Account made to Bank, then, and in any
such event, Borrower shall pay to Bank upon demand of Bank such additional
amounts as Bank may determine to be necessary so that every net payment of
principal and interest on the CD Funds Account and/or the Libor Rate Account,
after withholding or deduction for or on account of any such taxes, will not be
less than any amount provided herein.  In addition, if at any time when the
Matching Funds Elections are outstanding any laws are enacted or promulgated,
or any court of law or governmental agency interprets or administers any law,
which, in any such case, changes the basis of taxation of payments to Bank of
principal of or interest on the CD Funds Account and the Libor Rate Account by
subjecting such payments to double taxation or otherwise (except through an
increase in the rate of tax on the overall net income of Bank) then Borrower,
within thirty (30) days will either (i) pay Bank such amounts as Bank may
determine to be necessary to compensate Bank for any such increased costs
and/or losses resulting therefrom, (ii) convert the balance of any Matching
Funds Elections to Stated Rate Loans, or (iii) prepay any Matching Funds
Elections without penalty.  Bank shall give notice to Borrower upon becoming
aware of the amount of any loss incurred by it through enactment or
promulgation of any such law that changes the basis of taxation of payments to
Bank or of any such enactment or promulgation that may result in such payments
becoming subject to double taxation or otherwise.  Bank shall also deliver to
Borrower a certificate of Bank setting forth the basis for the determination of
such loss and the computation of such amounts.  Determinations made by Bank for
purposes of this Section 18 of the effect of such taxes on its costs of making
or maintaining Matching Funds Elections or on amounts receivable by it in
respect of such Matching Funds Elections and of the additional amounts required
to compensate Bank in respect thereof shall be conclusive, absent manifest
error.

       19.    Illegality, Change in Laws, Etc.  If at any time the adoption of
any new law, change in existing laws, or interpretation of any new or existing
laws shall make it unlawful





                                      -12-
<PAGE>   13
or impossible for Bank to (1) maintain its commitment to make it unlawful or
impossible for Bank to maintain its commitment to make Matching Funds
Elections, then upon such notice to Borrower of such fact Bank's commitment, to
make Matching Funds Elections shall terminate; or (2) maintain or fund its
Matching Funds Elections hereunder, then Bank shall promptly notify Borrower in
writing and Borrower shall, within thirty (30) days, either (i) repay the
outstanding Matching Funds Elections owed to Bank, without penalty (or
immediately if Bank may not lawfully continue to maintain and fund such
Matching Funds Elections) or (ii) convert such Matching Funds Elections time to
bear interest at the Stated Rate.

       20.    Risk-Primed Capital Requirements.  In the event that Bank
determines that (a) compliance with any judicial, administrative, or other
governmental interpretation of any law or regulation or (b) compliance by Bank
or any corporation controlling Bank with any guideline or request from any
central bank or other governmental authority (whether or not having the force
of law) has the effect of requiring an increase in the amount of capital
required or expected to be maintained by Bank or any corporation controlling
Bank, and Bank determines that such increase is based upon its obligations
hereunder, and other similar obligations, Borrower shall, within thirty (30)
days, (x) pay Bank such additional amount as shall be certified by Bank to be
the amount allocable to Bank's obligation to Borrower hereunder, or (y) prepay
this Note in full without penalty.  Bank will notify Borrower of any event
occurring that will entitle Bank to compensation pursuant to this Section 20
after Bank obtains knowledge thereof and determines to request such
compensation.  Determinations by Bank for purposes of this Section of the
effect of any increase in the amount of capital required to be maintained by
Bank and of the amounts allocable to Bank's obligations to Borrower hereunder
shall be conclusive, absent manifest error.

       21.    Loan Agreement.  This Note has been issued pursuant to the terms
of the Loan Agreement, to which reference is made for all purposes.  Advances
against this Note by Bank or other holder hereof shall be governed by the Loan
Agreement.  Bank is entitled to the benefits of and security provided for in
the Loan Agreement.  Terms used herein with initial capital letters and not
defined herein, if any, have the meanings given them in the Loan Agreement.
Any notice required or which any party desires to give under this Note shall be
given and effective as provided in the Loan Agreement.  Chapter 15 of the Texas
Credit Code, as amended from time to time, does not apply to this Note.

       22.    Defaults.  Any Event of Default under this Note shall constitute
an Event of Default under each of the Loan Documents, and any default under any
of the Loan Documents shall constitute an Event of Default under this Note and
under each of the Loan Documents.  Upon the occurrence of an Event of Default,
the holder hereof shall have the right to declare the unpaid principal balance
and accrued but unpaid interest on this Note at once due and payable (and upon
such declaration, the same shall be at once due and payable), and to exercise
any of its other rights, powers and remedies under this Note, under any other
Loan Document, or at law or in equity.





                                      -13-
<PAGE>   14
       23.    No Waiver.  Neither the failure by the holder hereof to exercise,
nor delay by the holder hereof in exercising, the right to accelerate the
maturity of this Note or any other right, power or remedy upon any default
shall be construed as a waiver of such default or as a waiver of the right to
exercise any such right, power or remedy at any time.  No single or partial
exercise by the holder hereof of any right, power or remedy shall exhaust the
same or shall preclude any other or further exercise thereof, and every such
right, power or remedy may be exercised at any time and from time to time.  All
rights and remedies provided for in this Note and in any other Loan Document
are cumulative of each other and of any and all other rights and remedies
existing at law or in equity, and the holder hereof shall, in addition to the
rights and remedies provided herein or in any other Loan Document, be entitled
to avail itself of all such other rights and remedies as may now or hereafter
exist at law or in equity for the collection of the indebtedness owing
hereunder, and the resort to any right or remedy provided for hereunder or
under any such other Loan Document or provided for by law or in equity shall
not prevent the concurrent or subsequent employment of any other appropriate
rights or remedies.  Without limiting the generality of the foregoing
provisions, the acceptance by the holder hereof from time to time of any
payment under this Note which is past due or which is less than the payment in
full of all amounts due and payable at the time of such payment, shall not (a)
constitute a waiver of or impair or extinguish the rights of the holder hereof
to accelerate the maturity of this Note or to exercise any other right, power
or remedy at the time or at any subsequent time, or (b) constitute a waiver of
the requirement of punctual payment and performance, or a novation in any
respect.

       24.    Collection Costs; Attorneys' Fees.  If any holder of this Note
retains an attorney in connection with any default or at maturity or to
collect, enforce or defend this Note or any other Loan Document in any lawsuit
or in any probate, reorganization, bankruptcy or other proceeding, or if
Borrower sues any holder in connection with this Note or any other Loan
Document and does not prevail, then Borrower agrees to pay to each such holder,
in addition to principal and interest, all reasonable costs and expenses
incurred by such holder in trying to collect this Note or in any such suit or
proceeding, including reasonable attorneys' fees.

       25.    Limitation on Interest.  It is the intent of Bank and Borrower
and all other parties to the Loan Documents to conform to and contract in
strict compliance with applicable usury law from time to time in effect.  All
agreements between Bank or any other holder hereof and Borrower (or any other
party liable with respect to any indebtedness under the Loan Documents) are
hereby limited by the provisions of this paragraph which shall override and
control all such agreements, whether now existing or hereafter arising and
whether written or oral.  In no way, nor in any event or contingency (including
but not limited to prepayment, default, demand for payment, or acceleration of
the maturity of any obligation), shall the interest taken, reserved, contracted
for, charged or received under this Note or otherwise, exceed the maximum
nonusurious amount permissible under applicable law.  If, from any possible
construction of any document, interest would otherwise be payable in excess of
the maximum nonusurious amount, any such construction shall be subject to the





                                      -14-
<PAGE>   15
provisions of this paragraph and such document shall be automatically reformed
and the interest payable shall be automatically reduced to the maximum
nonusurious amount permitted under applicable law, without the necessity of
execution of any amendment or new document.  If the holder hereof shall ever
receive anything of value which is characterized as interest under applicable
law and which would apart from this provision be in excess of the maximum
nonusurious amount, an amount equal to the amount which would have been
excessive interest shall, without penalty, be applied to the reduction of the
principal amount owing on the indebtedness evidenced hereby in the inverse
order of its maturity and not to the payment of interest, or refunded to
Borrower or the other payor thereof if and to the extent such amount which
would have been excessive exceeds such unpaid principal.  The right to
accelerate maturity of this Note or any other indebtedness does not include the
right to accelerate any interest which has not otherwise accrued on the date of
such acceleration, and the holder hereof does not intend to charge or receive
any unearned interest in the event of acceleration.  All interest paid or
agreed to be paid to the holder hereof shall, to the extent permitted by
applicable law, be amortized, prorated, allocated and spread throughout the
full stated term (including any renewal or extension and including the term of
the Prior Note of such indebtedness so that the amount of interest on account
of such indebtedness does not exceed the maximum nonusurious amount permitted
by applicable law.  As used in this paragraph, the term "applicable law" shall
mean the laws of the State of Texas or the federal laws of the United States,
whichever laws allow the greater interest, as such laws now exist or may be
changed or amended or come into effect in the future.

       26.    Jointly and Severally Liable.  If more than one person or entity
executes this Note as Borrower, all of said parties shall be jointly and
severally liable for payment of the indebtedness evidenced hereby.  Borrower
and all sureties, endorsers, guarantors and any other party now or hereafter
liable for the payment of this Note in whole or in part, hereby severally (a)
waive demand, presentment for payment, notice of dishonor and of nonpayment,
protest, notice of protest, notice of intent to accelerate, notice of
acceleration and all other notice, filing of suit and diligence in collecting
this Note or enforcing any of the security herefor; (b) agree to any
substitution, subordination, exchange or release of any such security or the
release of any party primarily or secondarily liable hereon; (c) agree that the
holder hereof shall not be required first to institute suit or exhaust its
remedies hereon against Borrower or others liable or to become liable hereon or
to enforce its rights against them or any security herefor; (d) consent to any
extension or postponement of time of payment of this Note for any period or
periods of time and to any partial payments, before or after maturity, and to
any other indulgence with respect hereto, without notice thereof to any of
them; and (e) submit (and waive all rights to object) to personal jurisdiction
in the State of Texas, and venue in Dallas County, Texas, for the enforcement
of any and all obligations under the Loan Documents.

       27.    Modifications.  This Note may not be changed, amended or modified
except in a writing expressly intended for such purpose and executed by the
party against whom enforcement of the change, amendment or modification is
sought.





                                      -15-
<PAGE>   16
       28.    Business Purposes.  The loan evidenced by this Note is made
solely for business proposes and is not for personal, family, household or
agricultural purposes.

       29.    CHOICE OF LAW.  THIS NOTE, AND ITS VALIDITY, ENFORCEMENT AND
INTERPRETATION, SHALL BE GOVERNED BY TEXAS LAW (WITHOUT REGARD TO ANY CONFLICT
OF LAWS PRINCIPLES) AND APPLICABLE UNITED STATES FEDERAL LAW.

       30.    Time of the Essence.  Time shall be of the essence in this Note
with respect to all of Borrower's obligations hereunder.

       31.    Renewal, Extension and Increase.  This Amended and Restated
Promissory Note is executed in renewal, extension, modification, amendment,
restatement and in increase of, but not in extinguishment of, the Prior Note.
Borrower acknowledges and agrees that certain advances made by Bank to Borrower
under the Prior Note are now evidenced by this Note.

       32.    No Other Agreements.  THE LOAN DOCUMENTS REPRESENT THE FINAL
AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR,
CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES.

          THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

       IN WITNESS WHEREOF, Borrower has duly executed this Note as of the date
first above written.


                                     BORROWER:

                                     TECNOL MEDICAL PRODUCTS, INC.,
                                     a Delaware corporation


                                     By:  /s/ DAVID RADUNSKY                    
                                         ---------------------------------------
                                         David Radunsky,
                                         Chief Operating Officer





                                      -16-