dentistry prosthodontics copy denture

1. PRESENTATION
BY
Dr. FAHD BANGASH

2. Definition
 A second denture intended to be the replica of the
first.
OR
 The transfer of the contours from the old to the new
denture t0 maintain neuromuscular control

3. INDICATIONS
 For the older patients to have replacement dentures
with improved, fit and similar to those with which the
patients are accustomed.
 To renew old deteriorated and stained denture base
material duplicated denture will have the appearance
of the new one.
 For physically or psychologically impaired patient who
cannot adapt to new dentures.
 deficiencies on the occlusal surfaces
 Deficiencies on the impression surfaces
 Deficiencies on the polished surfaces

4.  Geriatric patients with deficiencies in the occlusal and
impression surfaces

5. CONTRAINDICATIONS
 Any serious defects of the denture prosthesis.. So
careful evaluation of hard and soft tissues and the
prosthesis is done before duplication.

6. DENTURE IS EVALUATED FOR :-
 Fracture
 Craze line ( are tiny vertical cracks in our teeth. They
can be caused by many potential causes, including an
imbalanced bite.)
 Missing and replaced teeth
 Esthetics
 Phonetics
 Accuracy of fit
 Vertical and centric relation

7. ADVANTAGES OF COPY DENTURE
 Less clinical and laboratory stages than normal
method of making new denture
 Less work for dental technician
 Can make copy denture (usually) without damaging
the old ones, and without needing to take the dentures
away from the patient between appointments, which
may be socially awkward for them

8. TECHNIQUES
 Denture flask technique
 Soap dish technique

9. Denture flask technique

10. The denture is submerged in alginate

11. When the alginate is set, any flask of the material
on the base is trimmed with a sharp knife.

12. The flask is then filled with a new mix of alginate –
avoiding any air entrapment, and the lid is closed

13. Alginate halves are separated and the denture is
removed. It is returned to the patient.

14. Spur holes are then cut into the posterior border
of the alginate mold.

15. The impression is reassembled and held together with
adhesive tape. Auto-polymerizing resin is then run into
one of the spur holes until it rises from the other.

16. Lastly, the duplicate monochrome denture is removed
from the flask and mounted on a suitable articulator.
Then the pink coloured teeth are replaced by the
selected mold of the teeth

17. Original and auto-polymerizing resin upper and
lower template dentures.

18. Soap dish technique

19. The soap container

20. Denture borders are modified with green stick
compound.
Its then submerged in the soap container

21. Denture invested in the lower part of the
container.

22. Second pour of alginate to complete the investment
procedure- the soap container should be pressed from
the sides to avoid its distortion.

23. Line drawing showing the mould components.

24. Two halves are then opened and the spur holes
(diameter of a pencil) are cut with a sharp knife. The
halves are then reassembled and can be held together
with elastic bands.

25. Replication of teeth in wax

26. Wax horse shoe representing the teeth

27. Two halves together- self cure resin is being poured
down one of the holes with light vibrations. While air
escapes from the other. Pace the container with the
spur holes upright.

28. The waxed or auto-polymerized duplicate
dentures are then recovered from the molds

29. Upper lower templates wax teeth and self-cured
acrylic resin bases

30. The wax teeth on one of the dentures are then
replaced with the identical moulds of the resin teeth.
The opposing denture guides the set up in identical
position to the original denture.

31. Patient seem’s happy

32. Thank you