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Copy Dentures Part 1

Copy Dentures Part 1. Copy dentures are constructed to replicate the existing:. Lip support Anterior tooth position Level and angle of the occlusal plane Posterior tooth interdigitation Shape of the denture base and flanges. Soft Tissue. Provide soft tissue support

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Copy Dentures Part 1

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  1. Copy DenturesPart 1

  2. Copy dentures are constructed to replicate the existing: • Lip support • Anterior tooth position • Level and angle of the occlusal plane • Posterior tooth interdigitation • Shape of the denture base and flanges

  3. Soft Tissue • Provide soft tissue support • Preservation of the philtrum • Preservation of the vermilion boarder

  4. The importance of tooth position & lip Support

  5. Copy dentures should be prescribed when: Tooth position is satisfactory i.e. where the teeth are positioned correctly within the neutral zone. Tongue Cheeks Muscle Force Muscle Force

  6. Level and angle of the occlusal plane

  7. Tooth Interdigitation

  8. Shape of the denture base and flanges

  9. Patient selection criteria • It is important to identify patients who find difficulty in adapting, or are unwilling to learn new skills. • Such patients will benefit greatly from treatment that makes minimum change from the old to new dentures • Copy dentures facilitate a smoother transition from old to new prostheses.

  10. Copy dentures Want their existing dentures copied Have never had to do without their dentures Have difficulty adapting to new dentures Are used to public speaking Play wind instruments etc. Are for patients who:

  11. Copy dentures • A patient may be wearing dentures that are inadequate, yet comfortable and efficient and are able to control them via neuromuscular skills acquired over a long period. • New prostheses require the development of a new learning sequence • Persistence is required in learning it.

  12. Stage 1: Clinical procedure

  13. Stage 1: Clinical procedure

  14. Stage 1: Clinical procedure Don’t forget to apply tray adhesive

  15. Stage 1: Clinical procedure Recording the polished surface

  16. Stage 1: Clinical procedure Recording the fitting surface Petroleum jelly is used as a separating medium

  17. Stage 1: Clinical procedure A second tray is added to impart rigidity to the mould

  18. Stage 1: Clinical procedure

  19. Stage 1: Clinical procedure The dentures are given back to the patient

  20. Stage 2: Production of the template Molten wax is pored into the area occupied by the teeth and allowed to cool. Holes are cut in the impression material at the posterior border of the dentures and a wax funnel is constructed after the moulds are rejoined.

  21. Stage 2: Production of the template The mould is closed and the sprue holes checked to ensure that they are large enough to allow passage of the fluid mix of the cold-cure resin. Mixing the cold-cure resin.

  22. Stage 2: Production of the template Both moulds are placed into a pressure curer for approximately 20 mins.

  23. Stage 2: Production of the template The template dentures are removed from the moulds and the spues are removed

  24. Stage 2: Production of the template The templates are now ready for the next technical stage.

  25. In summary • Properly designed and constructed copy dentures replicate all of the favourable aspects of patients’ existing dentures. • Replication of the polished surfaces and tooth position helps the patient maintain the same degree of neuromuscular control that they have built up over time.

  26. References • Heath JR, Basker RM The dimensional variability of duplicate dentures produced in a alginate investment. Br Dent J. 1978 Feb 21;144(4):111-4. • Heath JR, Johnson A. The versatility of the copy denture technique British Dental Journal, 1981; 150: 189-193. • Ellis JS, Pelekis ND, Thomason JM. PURPOSE: Conventional rehabilitation of edentulous patients: the impact on oral health-related quality of life and patient satisfaction. J Prosthodont. 2007 Jan-Feb;16(1):37-42. • The copy denture technique. N Z Dent J. 1992 Apr;88(392):56-9. • Ansari IH. Duplicating an existing complete denture to make a replica. J Prosthet Dent. 1994 Oct;72(4):445-7. • Davis DM. Copy denture technique: a critique. Dent Update. 1994 Jan-Feb;21(1):15-20. • Davis DM, Watson RM. A retrospective study comparing duplication and conventionally made complete dentures for a • Lindquist TJ, Narhi , Ettinger RL. Denture duplication technique with alternative materials. J Prosthet Dent. 1997 Jan;77(1):97-8.

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