Denture Duplication aims the transfer of contours from old to new dentures to maintain neuromuscular control. New dentures will have successful features of old ones. Any modifications done to the basic shape of old denture should be : those needed to correct loss of fit and those considered essential by the dentist i.e replacement of worn acrylic teeth.

1. Dr. Ibadat Jamil
Assistant professor
Dep. Of Prothodontics

2. C.E. ADAM, in 1958
Denture prepared for a relining
impression with heavy thread loop
through holes
Labial flange is cut so that the denture
can be removed from the cast
Cast with escape hole provided in the
palate

3. Cast & the denture to be duplicated are
attached to the base of the duplicating flask
Cast & denture are removed
from the hydrocolloid mould

4. Cast is placed back in the mould after
the denture has been removed, mould
is filled with molten wax.
Left is the duplicate, right is the
original denture.
Wax pattern of the duplicate denture.

5. LAWRENCE & ANDERSON IN 1975

6. Filled second tray in place.
Completed mould with denture
removed.

7. Mould held together with rubber bands.
Mixed acrylic resin being poured in to the mould.
Patient denture & duplicate denture.
Finished impression side of the duplicate denture.

8. GEORGE WAGNER IN 1987
Wax sprues attached to the most
distal polished surface.
Swab stick pressed into the wax
sprues at a level to permit denture
to hang freely.

9. Waxed dental floss pressed on to flanges of
the denture midway between borders & teeth.
Lingual loop is pulled out to cut the lingual
side.
Floss on lingual surface of the mandibular
denture.

10. Mold is removed from the cup.
Mold separated shows tissue side of the
denture.
Floss is pulled around the mold to cut it
into half.

11. Tissue side of the mold .
A. Enlarged spure hole.
B. Tooth colored acrylic resin.
Mold replaced in cup & filled with pink
autocuring acrylic resin.

12. Tooth side of the mold.
Top – original denture.
Bottom – duplicate denture.
Top – original denture.
Bottom – duplicate denture.

13. TERRY, TIMO & RONALD IN 1997
Wax sprues attached to the distal
extension of the denture bases.
Polished denture surface placed in
impression material to the level of
denture borders.

14. Reverse side of second impression
tray & impression material is adopted
to tissue denture surface & first layer
of material.
Separated trays show negative
impression of the denture.

15. Md.TARIQ & SUZA FARAG IN 2001
Deflasking.
Denture with investing stone
separated from upper half of the
flask.

16. Capstone layer separated from
second layer with saw cuts.
Parts of second layer with the
original denture after separation.

17. Stone pieces reassembled in the flask.
Molten wax poured in to teeth mould.

18. Arch wax of teeth seperated
from stone pieces of upper
half.
Acrylic arch teeth in mold
before packing.