The posterior palatal seal area

By Dr.Swathi Pai on Wednesday, January 7, 2009 with 0 comments

The purpose is to allow movement against the yielding tissue and maintain a posterior border seal as the denture moves with torque producing forces. Other purposes include: compensates for dimensional changes, prevents food from getting beneath the denture, reduces gagging, adds strength, and less noticeable to the tongue.

Anatomy: Anterior soft palate contains the palatine aponeurosis and is lined by non-keratinized tissue. The submucosa is loose and contains mucous glands. The palatine aponeurosis is formed by the expanded tendons of the tensor palatine muscles covered with a thick layer of glands.

Location of: Locate the hamular notch with a mirror by sliding over the tuberosities and mark with an indelible pencil. The vibrating line is located at the junction of the movable and immovable soft palate. It is not always symmetrical and is thinner in the midline. Mark with an indelible pencil. The vibrating line is always on the soft palate.

Palatal Throat forms:

I-low, flat vault in the hard palate.
II-a medium width posterior palatal seal.
III-high vault in the hard palate.

Techniques for recording:

a. Use of Iowa wax or Korecta Wax #4.
b. Mark landmarks as noted above and reinsert impression.
c. Palpate seal area.
d. Apply wax and insert at moderate pressure and allow to cool for seven minutes.
e. Check to see wax is touching in all areas, add as needed.
f. Trim to indelible pencil line.

Category: Prosthodontics Notes



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