What is posterior palatal seal?

The posterior palatal seal is defined as, “the soft tissues along the junction of the hard and soft palates on which pressure within thephysiological limits of the tissues can be applied by a denture to aid in the retention of the denture”.

What is the purpose of the post palatal seal?

The posterior palatal seal functions to provide retention and stability of a well-adapted denture through forces of adhesion, cohesion and interfacial surface tension by providing a proper seal, prevents food accumulation between posterior border of denture and soft palate, to reduce the tendency of gag, to make the …

What does the post palatal seal consist of?

The posterior palatal seal area is defined as 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 removable complete denture to aid in its retention.

Why is posterior palatal seal cupid bow shaped?

It appears to be as a cupids bow. Anterior vibrating line demarcates zone of transition between no movement of the tissue overlying hard palate and some movement of the tissues of soft palate. It serves as anterior border of posterior palatal seal. It extends laterally into pterygomaxillary notch.

Why is PPS cupid bow shaped?

The termination of glandular tissue usually coincides with the anterior vibrating line. The visual outline is in the shape of cupid bow the area between the anterior posterior vibrating lines is usually narrowest in the mid palatal region because of the projection of the posterior nasal spine. 6.

What is compensating curve?

The curvature of the occlusal plane of dentures, created to permit balanced occlusion, to compensate for the paths of the mandibular condyles as the mandible moves from centric to eccentric positions.

What is a denture flange?

the part of the denture base that extends from the cervical ends of the teeth to the denture border. Pronunciation.

How do you get a vibrating line?

The anterior vibrating line can be visualized by asking the patient to say ‘ah’ in short vigorous bursts or by asking the patient to perform the Valsalva maneuver. The posterior vibrating line lies in the area of the junction of the aponeurotic portion of the soft palate and the muscular portion of the soft palate.

What material is used for final impressions?

There are many materials for the final impression, such as gypsum, zinc oxide and eugenol (ZOE) paste, polysulfide rubber, polyether, polyvinyl siloxane, and alginate. Preferences vary much among dentists. However, there is no evidence that one technique or material produces better long term results than another.

What’s the most reliable method to detect PPS?

It is noted that in very few patients who cannot perform “Valsalva maneuver” that requires both the nostrils be held firmly while the patient blows gently through the nose, delineation of anterior vibrating line is difficult; intraoral palpation with a blunt instrument like “T” burnisher is the most reliable method to …

What is combination syndrome?

Combination syndrome (CS) is a dental condition that is commonly seen in patients with a completely edentulous maxilla and partially edentulous mandible with preserved anterior teeth.

Why do you need a posterior palatal seal?

The posterior palatal seal is placed for two reasons, to overcome polymerization shrinkage of the acrylic resin and to maintain seal during small denture movements during function. This program illustrates one of the most common methods of establishing the posterior palatal seal. Like this slideshow? Why not share! 1. 26.

Where is the postpalatal seal located in the human body?

A. Pterygomaxillary seal extends through the pterygomaxillary notch.B. Postpalatal seal extends medially from one tuberosity to the other.C. Posterior palatal area lies between the anterior and posterior vibrating lines. 8. ANTERIOR AND POSTERIOR VIBRATING LINESThe posterior palatal seal area lies between the anterior and posterior vibrating lines.

How big should the post palatal seal be?

Heat initiated polymerization results in the resin pulling away from the cast up to 0.8 mm in the central areas between each hamulus. This area should be scraped on the cast to a depth of 1.0 – 1.5 mm to the assure that the post-palatal seal still displaces adequate tissue for denture retention.

Where is the AH line in the posterior palatal seal?

Method 2: ‘Ah’ line: It is the area at, or distal to the junction of the hard and soft palates where movement occurs when the patient says „ah‟ with short vigorous burst. Due to the projection of the posterior nasal spine, the anterior vibrating line is not a straight line between both hamular processes.