Anatomic landmarks and muscles affecting denture borders.

By Dr.Swathi Pai on Friday 9 January 2009 with 0 comments



What are critical anatomic areas that influence maxillary denture retention, stability and support?

Maxillary arch Mandibular arch

  1. Hamular notches – retention Buccal shelf - support

  2. Soft palate – retention Retromolar pad - support

  3. Posterior palatal seal - retention Retromylohyoid space - stability

  4. Hard palate – Support, retention Sublingual fold - stability

  5. Buccal vestibule – retention, stability

Hamular Notch: if not extended properly can cause a lack of retention. It is formed by the pterygoid hamulus of the sphenoid bone, the pyramidal process of the palatine bone, and the maxillary tuberosity. This trough is the lateral indication for completing the posterior palatal seal. Its displacement relates to the action of the pterygomandibular raphe. What tendon/muscle is frequently active in this region? Tendon of the tensor levator palatini muscle behind the hamular notch and vertical tendinous slips of the internal pterygoid muscle.

What effect of the Masseter muscle have on the denture base?

The muscle activity will effect the mandibular denture base contour on the posterior lateral aspect.

What are the intersection of muscles of facial expression that comprise the modiolus?

How does the buccinator muscle contribute?

The superior fibers of the buccinator muscle act to seat the maxillary denture, the middle fibers control the bolus of food and the inferior fibers contribute to mandibular denture stability.

Category: Prosthodontics Notes

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