Stability in complete /certified fixed orthodontic courses by Indian dental academy


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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

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Stability in complete /certified fixed orthodontic courses by Indian dental academy

  1. 1. STABILITY IN COMPLETE DENTURE INDIAN DENTAL ACADEMY Leader in continuing dental education
  3. 3. Definition The quality of a denture to be firm, steady or constant to resist displacement by functional stresses and not to be subject to change of position when forces are applied. GPT
  4. 4. VARIOUS FACTORS AFFECTING STABILITY 1. TISSUE SURFACE  Anatomy of residual ridge  Height  Contour  Arch form  Palatal vault  Quality of soft tissue covering the ridge  Quality of the impression  Adaptation of denture base to tissue 2. POLISHED SURFACE 3. OCLUSAL SURFACE  Tooth position  Occlusal plane  Ridge relation
  5. 5. 1. Tissue Surface Vertical Height Of Residual Ridge The height of the residual ridge influences the stability of complete denture: Increased height = Increased stability
  7. 7. ARCH FORM Square or tapered arches tend to resist rotation of the prosthesis better than ovoid arches
  8. 8. PALATAL VAULT Steep palatal vault may enhance stability by providing greater surface area of contact
  9. 9. Quality of Soft tissue covering the Ridge  The crest of the upper ridge is covered with fibrous connective tissue which usually closely attached to the bone.
  10. 10. TYPES PRELIMINARY IMPRESSION FINAL IMPRESSION 1.Hard with thin mucosal lining Modeling compound Medium fusing compound 2. Average amount of connective tissue with average tissue resilency Modeling compound Zinc oxide and eugenol paste 3. Heavy pad of mucoperiostium not firmly attached to underlying bone Freely flowing irreversible hydrocolloid Freely flowing zinc oxide eugenol paste 4. Hyper plastic tissue Extremely displaceable Soft free flowing alginate material Freely flowing alginate or thin mix of POP. Author: Buckley
  11. 11. Quality of Impression 1. Should be as accurate as possible. 2. Surface should be smooth and duplicate all the details accurately. 3. Should be devoid of voids and any rough surfaces. 4. Should not wrap on removal. 5. Should be dimensionally stable and the cast should be poured as soon as possible.
  12. 12. ADAPTATION OF DENTURE BASE TO TISSUE SURFACE FRIEDMAN Contacting of the labial and buccal flanges with the labial and buccal ridge slope serve as critical factors in contributing for the stability” BOUCHER Stability requires “maximum use of all bony foundation where the tissue are firmly and closely attached to the bone’’
  13. 13. Mandibular Lingual Flange
  14. 14. 2. POLISHED SURFACE The action of certain muscle group must be permitted to occur with out interference so that they will not dislodge the prosthesis during the function  The external surface should be developed to hormonize with the associated functioning of tongue, lips and cheek.
  15. 15. 2. Polished surface
  16. 16. IMPORTANCE OF THE MODIOLUS AND ASSOCIATED MUSCULATURE  The Modiolus is an anatomic landmark near the corner of the mouth that is formed by the intersection of several muscles of the cheeks and lips. These include the orbicularis oris, buccinator, caninus, tgriangularis, and zygomaticus muscles. Fish..
  17. 17. Modiolus  The denture base must be contoured to permit the modiolus to function freely. In the premolar region the mandibular denture should exhibit both a shortened and narrowed flange to permit the action that draws the vestibule superiorly and the modiolus medially against the dentures. Buccinator  The buccinator muscle may be divided into superior, middle and inferior divisions. According to FISH,”The superior fibers act seat the maxillary denture, the middle fibers controls the bolus of food, and the inferior fibers contribute to mandibular denture stability.
  18. 18. CONTOUR OF POLISHED SURFACE  The polished surfaces of the denture influence the fit. 1. Contour of the bulk of the denture must be in such way that it does not interfere with the normal function of the tongue, cheeks, and lips 2. There is less gingival prominenece on the buccal and labial surfaces of the lower dental arch than on the upper dental arch. 3. The lingual-gingival prominence on the mandible arch is minimal
  19. 19. 4. The contours of the denture should be harmony with the surrounding contacting tissues. 5. The lingual surface of the denture must not interface with the normal movements of the tongue.
  20. 20. 3.Occlusal Surface Tooth position During both functional and para functional movements, the occlusal surface should not strike prematurely in localized areas Anterior and posterior teeth should be arranged as close as possible to the position once occupied by the natural teeth with only slight modifications made to improve leverages and esthetics.
  21. 21. Occulsal surface A mandibular plane that is too high to can result in reduced stability.  lateral tilling force are magnified as the plane is raised.  an elvated occlusal plane prevents the tongue from reaching over the food table into the buccal vestibule.
  22. 22. Ridge relation  Normal dental relationships of the artificial teeth set on ridges that are in severe posterior cross bite can adversely affect stability.
  23. 23. Theories of occlusion Balanced occlusion “The simultaneous contacting of the maxillary and mandibular teeth on the right and left and in the posterior and anterior occlusal areas in centric and eccentric positions, developed to lessen or limit tipping or rotating of the denture bases in relation to the supporting structures”. GPT Lingualized Occlusion Provide both limited range of excursive balance and directing of forces to the lingual side of the lower ridge during working-side contacts. Such concepts may minimize horizontal stress and enhance denture stability.
  24. 24. Lingualized Occlusion Provide both limited range of excursive balance and directing of forces to the lingual side of the lower ridge during working-side contacts. Such concepts may minimize horizontal stress and enhance denture stability. Zero-degree teeth Zero-degree teeth may reduced horizontal forces there by minimizing the unseating of the denture.
  25. 25. CONCLUSION
  26. 26. References J.Pros.Den-80 (5); 150-161, 1955 J.Pros.Den-21 (4); 359-363, 1969 J.Pros.Den-49 (2); 165-172, 1983 J.Pros.Den-92 (6); 509-518, 2004
  27. 27. THANK YOU