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Complete dentures relining to increase retention.pptx
- 1. COMPLETE DENTURE RELINING It isthe procedures used to resurface the tissue-side of a denture with new material layer, thus producing an accurate adaptation to the denture foundation area. Purpose of complete denture relining • To re-establish the correct relation of the denture to basal tissue. • To restore lost occlusal and maxillomandibular relationship • To restore stability and retention.
- 2. INDICATIONS OF COMPLETE DENTURESRELINING • Immediate dentures after 3-6 months where maximum residual ridge resorption would have occurred. • Any denture that is loose because of poor adaptation to the supporting tissues • Economical reasons where the patient cannot afford a new denture. • Geriatric or chronically ill patients who cannot withstand physical and mental stress of constructing a new denture
- 3. CONTRAINDICATIONS OF COMPLETE DENTURESRELINING • When the residual ridge has resorbed excessively. • Abused soft tissues due to an ill-fitting denture. • Temporo-mandibular joint problems. • Patient dissatisfied with the appearance of the existing dentures. • Unsatisfactory jaw relationships in the denture. • Dentures causing major speech problems. • Severe osseous undercuts.
- 4. COMPLETE DENTURE RELINING PROCEDURE Reliningcan be achieved into two way: • Direct (chair side in the clinic). • Indirect (At the lab). Procedure of direct relining: Cold cured acrylic or tissue conditioner material is used, although this procedure is not very durable, it is less time consuming. The fitting surface of the denture is cleaned, roughened, and slightly reduced. The flanges are trimmed (to reduce danger of overextension) and the undercuts removed. Put lubricant over polished surface to prevent the new resin material to adhere on it.
- 5. Cont’n The new self-curingrelining material is then mixed and applied to the fitting surface. The denture is inserted and the patient asked to bite gently on the denture to ensure that the occlusion is not altered by the procedure. Border molding can then be carried out. The denture is kept in situ for about 5 minutes after which it is removed and carefully examined.
- 6. Procedure of indirectrelining • First at clinic The fitting surface is cleaned, the undercuts are removed and the flanges are shortened. Minor defects and extensions can be corrected. A wash impression by zinc oxide eugenol is taken with the old denture, with the patient in right occlusal contact • Second at the lab Beading and boxing of the impression, then pouring the boxed impression with stone material. The denture and the cast are not separated, but any excess impression on the teeth or facial surfaces of the base is removed, then the denture flasked in the usual manner.
- 7. Cont’n (Zinc oxide eugenol)elimination in hot water for 5 minutes; then separated and all the impression material is cleaned from the cast and the denture base. Painting the cast with a separating medium. Paint the surface of the denture with cotton pellet moistened with monomer. Mix the acrylic resin and place it in the flask (the new relining material should be compatible with the old denture base material chemically and esthetically).
- 8. Cont’n Curing the heatcured resin. The denture deflasked and the cast removed from the denture then polish the denture; the relined denture is ready to be inserted in the patient mouth.
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