The soft tissue area at or beyond the junction of the hard and soft palates on which pressure within physiologic limits can be applied by a complete denture to aid in its retention Anatomic considerations ID: 927176
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Slide1
Posterior Palatal Seal
Slide2Posterior palatal seal areaThe soft tissue area at or beyond
the junction of the hard and soft palates on which pressure, within physiologic limits, can be applied by a complete denture to aid in its retention.
Slide3Anatomic considerationsPosterior palatal seal divided according to anatomic boundaries into
1- Pterygomaxillary seal2-Post palatal seal
Slide4Slide5Anatomic consideration
hamular notch
Slide6Anatomical considerations
Slide7Anatomical considerations
Pterygomandibular raphe
Slide8Anatomic consideration
Slide9Anatomic Considerations
Hamular
notch
Slide10Anatomic Considerations
Median palatal raphe
Slide11These lines are defined as follows:
Slide12Anterior vibrating line
Slide13Slide14Posterior vibrating lines
Slide15Fovea palatines are two indentations oval to round in shape & unique to human race located approximately 1.3 mm anterior to anterior vibrating line.
Slide16Slide17Classification of Soft Palates; ( House classification)
Class II
soft palate makes a 45° angle to the hard palate, 1 to 5 mm of seal area depending on the muscular activity of the soft palate.
Good retention
Class III
soft palate makes a 70° angle to the hard palate. The soft palate is more acute in relation to the hard palate, permitting a narrow seal of less than 1 mm.
Poor retention
Class I
it is horizontal & makes 10° angle to the hard palate & allowing more than 5 mm of seal area most advantageous.
Ideal retention
Slide18Designs of the posterior palatal seal
Slide19TECHNIQUESTECHNIQUES There are several established techniques for the placement of PPS.
The important once are:-Conventional approachFluid wax technique
Slide20Slide21Slide22Slide23Slide240.5 mm
1 mm 1.5 mm
Slide25Slide26A bead posterior palatal seal.
A double bead posterior palatal seal.
A butterfly posterior palatal seal.
A butterfly posterior palatal seal with a bead on the posterior limit.
A butterfly posterior palatal seal with the hamular notch area cut to half the depth of a #9 bur.
Slide27FLUID WAX TECHNIQUE All of the procedure remain the same as conventional technique that is transfer location & transfer marking of the anterior & posterior vibrating line
The marking are recorded in final impression stage
Slide28Slide29Slide30Errors in recording the posterior palatal seal
UnderextensionOverextension
Underpostdamming
Overpostdamming
Slide31Thank you