Presentation is loading. Please wait.

Presentation is loading. Please wait.

Dr Nora sheta. Relief The reduction of undesirable pressure from specific areas under the denture.

Similar presentations


Presentation on theme: "Dr Nora sheta. Relief The reduction of undesirable pressure from specific areas under the denture."— Presentation transcript:

1 Dr Nora sheta

2 Relief The reduction of undesirable pressure from specific areas under the denture

3 Defintion : Relief area: “ Area in the fitting surface of the denture that is reduced to eliminate excessive pressure.”

4 Relief areas Hard areas MaxillaryMandibular Sensitive areas MaxillaryMandibular 1-Median palatine raphae 2-Torus palatinus{if present} 2-Torus palatinus {if present} Torus mandibularis{if present} Torus mandibularis {if present} 1-Incisive papilla 2-Rugae area 3-Flabby ridge 4-Sharp bony spicules 1-Mental foramen in resorbed ridges 2-Flabby ridge 3-Sharp bony spicules

5 Shape of Relief Area It is never well defined. It merges into the surrounding fitting denture surface. It depends on the compressibility of the area to be relieved as well as that of the surrounding areas.

6

7 Methods of Relief I- Direct 1-Scrap the final impression impression 2-Build tin foil on the master cast II- Automatic

8 I- Direct Relief 1- Scraping the Impression In plaster of paris impression material

9 I- Direct Relief 2- Build on the cast

10 I- Direct Relief 2- Build on the cast I- Direct Relief 2- Build on the cast

11 II- Automatic Relief (Selective Pressure Impression Technique) A- Scraping the compound selectively. B- Secondary impression in Zn/O eugenol or plaster.

12 Value of Relief Relief of sensitive areas increases the comfort of the patient. Relief of hard areas improves the denture stability, so it Prolongs the duration of denture service by compensating for denture settling and some ridge resorption. Compensate for polymerization shrinkage.

13 Posterior palatal seal ”post dam”

14 Definitions 1- Posterior palatal seal : “ A slight elevation at the posterior border of the maxillary denture.”

15 Definitions 2- Post damming : “ Slight compression of the soft tissues along the posterior border of the denture whether upper or lower.”

16 Definitions Posterior palatal seal area 3- Posterior palatal seal area “Area of resilient soft tissue at or beyond the junction between hard & soft palate, on which pressure within physiologic limits of tissue can be applied by the posterior border of the denture to aid in denture retention.”

17 Position of the Post dam area Position of the Post dam area Posterior vibrating line

18

19

20 Functions of posterior palatal seal 1.Retention of maxillary denture. 2.Prevents food accumulation under the denture. 3.Compensates for polymerization shrinkage. 4.Reduces patient’s discomfort.

21 Requirement of the effective posterior platal seal Easily displaceable tissue imovable tissue Touch the soft palate during rest and function

22

23 Width of post dam area

24 Depth of Post Dam Depends on the degree of compressibility of soft tissue in this area and on the extent of functional movement of the soft palate.

25

26

27

28 Methods of postdamming postdamming 1-Scraping method 2-Functional method

29 Methods of post damming 1-Scraping method 1-Scraping method

30

31

32

33

34 Methods of post damming 2- Functional method 2- Functional method

35

36 Methods of post damming 2- Functional method 2- Functional method

37

38 Post damming of the lower denture A lower impression may be post dammed by slightly compressing the soft tissues formming the pear shape retromolar pad

39


Download ppt "Dr Nora sheta. Relief The reduction of undesirable pressure from specific areas under the denture."

Similar presentations


Ads by Google