Posterior palatal seal1

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Presentation Transcript

Slide 2: 

DEPARTMENT OF PROSTHODONTICS SEMINAR TOPIC ON POSTERIOR PALATAL SEAL

POSTERIOR PALATAL SEAL : 

POSTERIOR PALATAL SEAL Introduction The denture must be seal all along its boundaries. The seal is known as peripheral seal. The posterior palatal seal is the part of this. The drapping of tissues over the buccal and lingual borders provides an effective seal in these region.

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The seal along the posterior border of maxillary denture is known as posterior palatal seal. However the posterior border of maxillary denture requires the different kind of seal because at the posterior aspect of denture in the area of the soft palate there are no cheek tissues to seal the denture border.

DEFINITION : 

DEFINITION The soft tissues at or along the junction of the hard and soft palate on which pressure with in the physiological limits of the tissues can be applied by a denture to aid in the retention of the denture. LOCATION The posterior palatal seal is formed through both hamular notches and across the palate over the vibrating line. FUNCTION Retention Prevents food accumulation beneath the denture Maintain contact with the moving soft palate and reduces the patient’s awareness and thus reduces gag reflex. As the posterior denture border will closely approximate the soft palatal tissues and compensates for the volumetric shrinkage that occurs during the polymerization of methyl methacrylate resin.

COMPONENTS OF POSTERIOR PALATAL SEAL : 

COMPONENTS OF POSTERIOR PALATAL SEAL PTERYGOMAXILLARY SEAL This is the part of the posterior palatal seal that extends across the hamular notch The pterygomaxillary seal is placed in hamular notch it is located behind the maxillary tuberosity. It is located using a T-burnisher, it is moved along posteriorily untill a soft depression is felt POST PALATAL SEAL This is the part of posterior palatal seal that extends between the two maxillary tuberosities.

BOUNDARIESOF POSTERIOR PALATAL SEAL : 

BOUNDARIESOF POSTERIOR PALATAL SEAL ANTERIORLY – Anterior vibrating line POSTERIORLY – Posterior vibrating line LATERALLY – Pterygomaxillary seal

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VIBRATING LINE The imaginary line across the posterior part of the palate marking the division between the movable and immovable tissues of the soft palate which can be identified when the movable tissues are moving.

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ANTERIOR VIBRATING LINE It is an imaginary line located at the junction of attached tissues overlying the hard palate and the movable tissue of the immediately adjacent soft palate. LOCATED BY – Valsalava Maneuver Patient is asked to say “ah” with short vigorous bursts.

POSTERIOR VIBRATING LINE : 

POSTERIOR VIBRATING LINE It is an imaginary line located at the junction of the soft palate that shows limited movements and the soft palate that shows marked movements. LOCATED BY – It is located by asking the patient to say “ah” in short but non vigorous fashion.

POINTS SHOULD BE REMEMBER WHILE RECORDING THE PPS : 

POINTS SHOULD BE REMEMBER WHILE RECORDING THE PPS Presence of palatine torus Position of fovea palatina Presence of mid palatine fissure Patient with thick ropy saliva

TECHNIQUES OF RECORDING THE PPS : 

TECHNIQUES OF RECORDING THE PPS [A] ARBITRARY TECHNIQUE Conventional Technique Boucher’s Technique [B] Physiologic TECHNIQUE Fluid wax Technique Extended Palatal Technique Stick Compound Technique

CONVENTIONAL TECHNIQUE : 

CONVENTIONAL TECHNIQUE Stage of recording After final impression Method Locate the hamular notches ↓ Marked with indelible pencil ↓ Posterior vibrating line marked by asking patient to say “ah” non vigorously. ↓ The hamular notch and posterior vibrating line are joined using indelible pencil

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The marking transferred to master cast. ↓ Anterior vibrating line marked by asking the patient to Perform valsalva manuver. ↓ The area between anterior and posterior vibrating line is scored on the cast.

BOUCHER’S TECHNIQUES : 

BOUCHER’S TECHNIQUES Stage of recording – During jaw relations Method Palpate hamular notch and marked with indelible pencil. ↓ Patient ask to say “ah” and vibrating line marked with indelible pencil. ↓ The earlier markings joined with this ↓

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Trial denture base inserted and line is transferred to it ↓ Excess base plate removed ↓ Placed on cast and posterior limit of base plate marked ↓ V – Shaped groove is carved on the cast

FLUID WAX TECHNIQUE : 

FLUID WAX TECHNIQUE Stage of recording After making the final impression. Method Zinc oxide eugenol or plaster impression are preferred ↓ Both the vibrating lines are marked in the mouth and transferred on to the impression ↓ Korrecta wax no. 4,Lowa wax, H-L physiologic paste or Adaptol may be used ↓ The molten wax is painted between the two lines

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The patient’s head should be downward by 30° ↓ The impression reinserted in the mouth and hold for 4 to 6 min ↓ The wax should terminate in a knife edge near the anterior vibrating line ↓ Excess wax is trimmed off

EXTENDED PALATAL TECHNIQUE : 

EXTENDED PALATAL TECHNIQUE Stage of recording After border moulding Method Denture border is extended 8.2 mm beyond the anterior vibrating line ↓ Head is fixed downward 30° ↓ Application of green stick compound to the seal area ↓ An angular depression is seen in the compound

STICK COMPOUND TECHNIQUE : 

STICK COMPOUND TECHNIQUE Stage of recording During border moulding before final impression made Method Application of stick compound on the tray between both The vibrating lines ↓ Pressed gently in the mouth

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↓ Excess material beyond the anterior vibrating line is trimmed off ↓ The region is flamed lightly and the process is repeated ↓ Dull appearance of compounds indicates positive contacts

ERRORS IN RECORDING PPS : 

ERRORS IN RECORDING PPS Over extension Under extension Under postdamming Over postdamming

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Thank you