Stability and support/ dentistry dental implants


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Stability and support/ dentistry dental implants

  2. 2. INTRODUCTION: A number of forces and factors combine to retain complete dentures in the mouth, not all these factors act at the same time, instead, some act only when they are needed to meet or resist a certain dislodging forces.
  3. 3. The factors that include to retain complete dentures in the mouth are 1}Retention 2}Stability and 3}Support
  4. 4.
  5. 5. STABILTY: “It is the quality of denture to be firm,steady or constant to resist displacement of functional stresses and not to be subject to change of positions when forces are applied”- G.P.T It is the ability of the denture to withstand horizontal forces.
  6. 6. Factors affecting stability of the denture are: Stability begins with an impression that does not displace the tissue but depends primarily on the following 1}vertical height of residual ridge 2}quality of soft tissue covering the ridge 3}quality of impression 4}occlusal rims 5)Arrangement of teeth 6)Contour of the polished
  7. 7. Vertical height of the residual ridge: The residual ridge should have sufficient vertical height to obtain good stability. highly resorbed ridges offer the least stability. the ridge should provide a firm soft tissue base with adequate sub mucosa to offer good stability. Flabby tissues with excessive sub mucosa offer poor stability.
  8. 8. Quality of impression An impression should be as accurate as possible The impression surface should be smooth and duplicate all the detail accurately. It should be devoid of voids and any rough surfaces It should be dimensionally stable and should not wrap on removal
  9. 9. Occlusal plane: the occlusal plane should be oriented parallel to the ridge. If the occlusal plane is inclined,then the sliding forces may act on the denture,reduce its stability. The occlusal plane should divide interarch space equally.
  10. 10. teeth arrangement:teeth arrangement: The position of teeth and their occlusion play anThe position of teeth and their occlusion play an important role in the stability of the denture.important role in the stability of the denture. Balanced occlusion facilitates the even distributionBalanced occlusion facilitates the even distribution of forces across the denture.of forces across the denture. Absence of balanced occlusion may produceAbsence of balanced occlusion may produce unbalanced forces on any one slide of the dentureunbalanced forces on any one slide of the denture leading to loss of stability.leading to loss of stability. teeth in the denture should be arranged in theteeth in the denture should be arranged in the neutral zone.neutral zone.
  11. 11. Contour of polished surface: The polished surfaces of the denture should be harmonious with the oral structures. They should not interfere with the action of the oral musculature..
  12. 12. SUPPORT
  13. 13. Definition The resistance to vertical forces of mastication,occlusal forces and other forces applied in a direction towards the denture bearing area.
  14. 14. MECHANISM OF COMPLETE DENTURE SUPPORT With complete dentures,the mucous membrane is forced to serve the same purpose as periodontal ligament that provide natural teeth. In order to provide good support,the denture base should cover as much denture bearing area as possible. This helps to distribute forces over a wide area.this ability of the denture to distribute forces over wide areas due to an increase in the denture base area is termed the SNOWSHOE effect. Confining the occlusal forces to stress bearing areas and relieving the non stress bearing areas will aid to improve support.
  15. 15.  Optimum out come of complete dentureOptimum out come of complete denture treatment depends upon the successfultreatment depends upon the successful integration of the prosthesis with theintegration of the prosthesis with the patients oral function plus psychologicalpatients oral function plus psychological acceptance of the denture by the patient.acceptance of the denture by the patient.  This is achieved by incorporatingThis is achieved by incorporating retentive,stabilizing and supportiveretentive,stabilizing and supportive features in the prosthesis.features in the prosthesis.
  16. 16.