Repair, relining and rebasing Dr. Amal Fathy Kaddah Professor of Prosthodontic, Faculty of Oral &Dental Medicine, Cairo University www.egydental.com First Steps In Making A Denture Primary impression Diagnostic cast Custom tray Final impression Master cast Impression Techniques
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Dr. Amal Fathy Kaddah
Professor of Prosthodontic,
Faculty of Oral &Dental Medicine, Cairo University
I- Conventional techniques
II- Selective pressure techniques
III- Functional techniques
IV- Reline and rebase techniques
(including secondary template impressions).
during function dropped on hard
Key of repair = accurate reassembling & alignment of the broken parts in their original position.
I) According to location of fracture
Midline fracture Any part fracture
Without broken or
missing part &/or
With broken or
missing part &/or
Early fracture Delayed fracture
(mainly in maxillary dentures)
1) No or insufficient relief in the midline. (M.P.R.) (Early fracture)
2) Ridge resorption with loss of relief effect. (Delayed fracture)
Stone plaster is poured into the fitting surface. After stone setting, the denture is removed from the cast and cleaned from any traces of sticky wax.
The cast is painted with separating medium and the denture is secured to the cast with rubber bands.
Main causeis falling on the ground or the sink during cleaning.
I- Fracture with no missing part
Repaired as mentioned.
A plaster index (key) is made to record & secure the position of waxed teeth.
Def:Resurfacing or correction of denture adaptation to underlying tissues by the addition of a new resin material to its fitting surface without changing its occlusal relation.
Addition of Material to the tissue side of a denture to improve its adaptation to the supporting mucosa.
Whenever the denture loses or has poor adaptation to the underlying tissues, while all other factors asocclusion, esthetics, centric relation, V.D.O. and denture base material are satisfactory.
A hole is made in the palatal surface to allow escape of excess impression material. Slight reduction in the fitting surface may be done to create some space for the impression material.
. The denture is flasked, and the old resin material is thoroughly cleaned and roughened.
. New acrylic resin material is packed, and the denture is cured in pressure curing unit containing water at 45°c for 20 min. to prevent porosity of new resin materialand warpage of the old resin material (release of internal stresses).
. Finishing and polishing is done in the usual manner.
When both upper and lower dentures need relining, lower denture should be completed first. The upper may be relined against a stable lower denture.
The denture should be clinically remounted to perfect the occlusion.
If after modifications, the “fit and bite” seem improved, let the patient try the denture for one week…if there is no improvement, then reline.
Irritation of Peripheral Borders
Error in CO on one side, will break the seal on the opposite side
Correct eccentric excursions
Recognition of abused tissues, with superimposed candidiasis.
2. Indicate amount of peripheral reduction required
1. Check extensions
3. Border Reduction
4. Tissue Conditioner preparation: Peripheral reduction + Tissue surface
5. Border Molding Completed
6. Palatal surface vented after B. M.
7. Seat denture until wash comes through vents
8. Final Impression
Trim excess wax beyond anterior line
ZnO wash. Posterior palatal seal area using impression wax
Reline final impression
Final Impression with Rubber base
Complete Denture method-ZnO
Border molding completed
Rubber Base Reline
Roughened border to blend new acrylic with old. Won’t show finishing line
After processing: Note junction line
Relined cast: Do not separate
Trimmed and polished
Def:It is a process of readaptation of a denture to the underlying tissues by replacing the denture base material with a new one without changing its occlusal relation.
When the existing denture base is unsatisfactory e.g. stained, crazed or porous.
The upper part of the duplicator is closed and denture teeth are waxed to the proper thickness and contour to the cast.