Final impression CD

this will help you understand final impression of CD with pictures

1. FINAL IMPRESSION
Ayesha Zaheer
Final year
Prosthodontic dept.

2. IMPRESSION
An imprint or negative likeness of the entire
denture bearing, stabilizing and the border seal
area present in edentulous mouth

3. Ideal impression should be
•Maximum extension without muscle
impingement.
•Intimate contact with the tissue area covered.
•Proper form of the borders including the
posterior border of the maxillary denture.
•Proper relief of hard and sensitive areas.
•To equalize forces on the denture foundation
area.

4. Objectives of impression
•Preservation of remaining structures
•Retention
•Esthetics
•Stability
•Support

5. Steps in making a denture
Diagnosis and treatment plan
Primary impression
Diagnostic cast
Custom tray
Final impression
Master cast

6. Final impression are made using
special (custom or individual) trays
constructed specifically for each pt.
on the study cast

7. Lab procedures
•Fabricate the custom tray
oMarking the cast
oProvide relief
oApplication of separating media
oAcrylic custom tray
ofunctional trimming

9. Check the tray extension
•Checking the facial border
Lips and cheeks pull toward tray to check any
displacement
•Checking the lingual borders
Check the anterior and posterior area of tray by
functional movements of tongue
Some displacement will still be observed

10. Custom tray requirements
•It should be dimensionally stable
•Should be strong
•Easy to construct
•Should be inexpensive
•Easy to trim in clinics
•Handle should be easy to grasp

11. Border molding
•Shaping of the border areas of impression
trays by functional and manual manipulation
•Peripheral tracing
•To record\duplicate the contour and size of
vestibule

12. importance
•Allow muscles to function in harmony with the
denture
•Also improves the seal

13. Border molding materials
•Modeling compound sticks
•Autopolymerizing resins
•Tissue conditioners
•Polyether impression paste
•Impression waxes
•periopak

14. Methods to border mold
•Functional method
•Manual or digital manipulation
•combination

15. Sequence to border mold
•Segment by segment
•In one step

16. Border molding with stick compound
•Heating
•Placing
•Tempering
•Inserting
•Reheating
•trimming

17. For maxillary border molding
•Labial frenum and labial flange
•Buccal frenum and buccal flange
•Coronoid notch
•PPS

18. For mandibular border molding
•Labial frenum and labial flange
•Buccal frenum and buccal flange
•Masseteric notch
•Lingual flange
•Mylohyoid portion of lingual flange
•Retromylohyoid portion

19. Functional movements
•Smiling\puckering labial and buccal border
•Sucking motion buccal frenum and border
•Licking lips lingual border
•Swallowing FOM and lingual border
•Opening, closing and side to side movements

20. Final impression

21. Health of tissues
•No distortion or inflammation of denture
foundation tissues
•Ptis instructed to leave old denture
out from mouth for at least
48hrs prior to final impression

22. Preparing for final impression
•Checking the retention
•Preparing and instructing the pt
•Preparing the tray for final impression
oRemoves wax relief
oEscape holes
oReduce border of compound stick
oAdhesives
oProtect the mouth
oDrying the mouth

23. Final impression materials
Zinc oxide eugenol
Alginate
Rubber base
Tissue conditioners
Impression plaster

24. Pt positining
•Upright in comfortable position with head on
head rest
For max
pt.-upright
Operator –right side\behind
For mand
Pt.-upright
operator-right side\front

25. Taking the impression
•Mixing
•Loading
•Seating
•Removing the impression
•Trim
•Disinfect
•Remaking

26. Special consideration
•Hypermobile ridges
-Window technique
•Extremely resorbed ridge
-Implants, bone grafting, vestibuloplasty
-Flange technique

27. Factors complicating the impression
•Uncooperative pt
•Excessive salivation
•Hyperactive gag reflex
oCauses
oManagement

28. THANK YOU