What is Post dam in complete denture?
Medical Definition of postdam : a posterior extension of a full denture to accomplish a complete seal between denture and tissues.
Why is a post dam added to an upper denture?
A post dam is commonly created on the cast after the completion of indexing or investment procedure required for relining/rebasing the denture. This method is convenient and avoids the inconvenience related to the turnaround of an indexed or invested cast between the practitioner and the dental technician.
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.
How do you find 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 is posterior palatal seal?
What is post dam area?
Post Dam Area: It is the area between anterior and posterior vibrating line. extends medially from one tuberosity to the other.
What is the vibrating line?
[ vī′brā′tĭng ] n. The imaginary line across the posterior palate, marking the division between the movable and immovable tissues.
What is the purpose of the posterior palatal seal?
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 …
How do you record a PPSA?
According to Nelson, for recording PPS, the position of head must be downward so that the Frankfort plane (portion- orbital) is a 30 (below the horizontal and the tongue is firmly positioned against the mandibular anterior teeth.
How is a trial base for post dam constructed?
A trial base is constructed by shellac base plate or well adapted self cured resin. Patient is asked to rinse with mouthwash to remove ropy saliva that might interfere with transfer of marking. 2, 10 Then, gauze is used to dry the posterior palatal area and palpation of hamular process is done with T burnisher or mouth mirror.
Where is the vibrating line on the post dam?
The area between the anterior and posterior vibrating line is scored in the master cast to a depth of approximating 1–1.5 mm on either side of mid palatine raphe.
Who is responsible for recording the posterior palatal seal?
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.
Where are the post palatal seal and pterygomaxillary seal?
Post palatal seal and pterygomaxillary seal are two separate but confluent areas that form the anatomic boundaries of posterior palatal seal ( Fig. 1 ). Post palatal seal extends medially from one tuberosity to another.