Why is a posterior palatal seal placed in a maxillary complete denture because?

The posterior palatal seal is placed in the maxillary complete denture because the acrylic will distort slightly and pull away from the posterior palatal area of the maxillary cast. The acrylic will shrink toward the areas of greatest bulk, which are the areas over the ridge where the teeth are placed.

What is Post dam dental?

Medical Definition of postdam : a posterior extension of a full denture to accomplish a complete seal between denture and tissues.

What is the function of the posterior palatal seal that is placed on the maxilla cast?

The purpose of the posterior palatal seal on a maxillary complete denture is to (1) create a seal along the posterior border of the denture at the junction of the hard and soft palates (immovable and movable tissues) to enhance retention of the maxillary denture; (2) provide the dentist or laboratory technician a …

What does the post dam provide on a maxillary denture?

The laboratory relining/rebasing of a maxillary complete denture (CD) requires a uniform reduction in the intaglio surface of denture base. This procedure provides a space for impression material and a new layer of acrylic resin.

Why is posterior palatal seal important?

The posterior palatal seal (PPS) is an important structure aiding in retention of maxillary complete denture. Failure to properly record it may lead to seal failure, decrease retention and physiological violation of palate.

What is post palatal seal?

Abstract. 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.

What is posterior palatal seal?

How do you get posterior palatal seal?

An adequate seal of the posterior border of a maxillary denture is essential for retention. Establishment of a posterior palatal seal (PPS) is performed routinely by locating the vibrating line in the patient’s mouth, transferring it to the master cast, and arbitrarily scribing the cast before processing the dentures.

Where is posterior palatal seal located?

ANTERIOR AND POSTERIOR VIBRATING LINES The posterior palatal seal area lies between the anterior and posterior vibrating lines. The anterior vibrating line is an imaginary line located at the junction of the attached tissues overlying the hard palate and the movable tissues of the immediately adjacent soft palate.

Does posterior palatal seal cover the soft palate?

Abstract. The posterior palatal seal contributes significantly to the retention of a maxillary complete denture. It is commonly considered to lie on the tissue covering the soft palate.

What is a 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”. 4.

Who is responsible for recording posterior palatal seal in dentures?

The responsibility of recording posterior palatal seal lies on the dentist and not the lab technician. The aim of this article is to supply adequate information on methods and importance of recording posterior palatal seal, problems encountered while recording posterior palatal seal for longevity of complete denture treatment.

Is it possible to obtain peripheral seal at posterior border of denture?

However, it is difficult to obtain peripheral seal at posterior border of upper denture as there is no soft tissue draping. Fovea palatinae which has been considered as reliable anatomical guide in unmutilated mouth.

How far does the post palatal seal extend?

The post palatal seal extends medially from one tuberosity to the other. Laterally, the pterygomaxillary seal extends through the ptrygomaxillary notch (hamular notch),continuing for 3 to 4 mm anterolaterally approximating the mucogingival junction.