relief and posterior palatal seal

Question 1

hard areas of relief in maxilla:

Answer 1

-median palatine raphe
-torus palatinus
-thin bony edges

Question 2

hard areas of relief on mandible?

Answer 2

-torus mandibularis
-thin bony edges
-wiry ridges

Question 3

describe the ideal outline of a relief area:

Answer 3

it should never have a clear outline ( no sharp lines) instead it should be round and flowy , merging into the surrounding fitting denture surface

Question 4

what is depth of relief dependant on ?

Answer 4

compressibility of areas to be relived as well as tissue surrounding it

Question 5

list the direct methods of relief

Answer 5

scraping the final impression

built on master cast

Question 6

functions of posterior palatal seal

Answer 6

• retention of maxillary denture
  -prevents food from getting stuck under denture
  -constant pressure which reduces gag reflex
  -compensate for polymerization shrinkage

Question 7

what are the requirements of a post. dam (posterior palatal seal )

Answer 7

-lie on easily displaceable tissues
-touch soft palate during rest and function

Question 8

which vibrating line is 2mm behind the focea palatina ?

Answer 8

posterior vibrating line (AH line ) , sperates from anterior vibrating line (valsalva maneuver) when patient says AH

Question 9

how does the curvature of the soft palate affect the posterior palatal seal area?

Answer 9

class I: gentle curvature of soft palate : broad posterior palatal seal area

class II: medium curvature of soft palate –> medium width of posterior palatal seal

class III : sharp curvature of soft palate –> narrow posterior palatal seal area

Question 10

average depth of post dam area:

Answer 10

1mm

Question 11

methods to create post dam ?

Answer 11

1- scrapping method
-functional post-damming

Question 12

what are the functions of relief?

Answer 12

-compensate for bone resorbtion
-compensate for technical discrepancies
-comfort for the patient

Question 13

sensitive areas to be relived on maxilla and mandible ?

Answer 13

maxilla:
-incisive papilla
-prominent tuberosity

mandible:
-mental foramen
-crest of thin ridge

Question 14

depth of relief is dependent on :

Answer 14

compressibility of areas to be relived as compared with that of the surrounding tissue

Question 15

posterior palatal seal should be on which part of the palate?

Answer 15

immovable part of the soft palate

Question 16

how is the posterior palatal seal created in the lower arch ?

Answer 16

at each distal extremity by slightly compressing the retro molar pad (should be the final impression step)