10 anatomic structures related to the mandibular denture

By Dr.Swathi Pai on Friday, January 16, 2009 with 0 comments

Retromolar pad: soft elevation of mucosa that lies distal to the 3rd molar.

-boundaries of retromolar pad:

-posterior: temporalis tendons

-lateral: buccinator

-medial: pterygomandibular raphae & superior constrictor

-the retromolar pad is posterior to the pear-shaped pad (residual 3rd molar scar)

Buccal shelf: a primary support area for lower denture.

-boundaries of buccal shelf:

-located between the buccal frenum and anterior edge of masseter

-lateral: external oblique

-medial: slope of ridge

Lingual frenum: a fibrous band of connective tissue that overlies the center of the genioglossus muscle.

Labial frenum: usually a single narrow band. The activity of this is vertical—so labial notch of denture is narrow. Mandibular labial frenum is usually shorter than maxillary labial frenum.

Labial vestibule: sulcus area between the buccal freni. The major muscle in this area is the orbicularis oris.

Buccal vestibule: width and length are dependent on buccal shelf and buccinator.

Masseter muscle: area influenced by this muscle is lateral to the pear-shaped pad.

An active masseter muscle creates a concavity in the outline of the DB border of the denture and a less active muscle creates a convex border.

Pterygomandibular raphae: originates from the pterygoid hamulus and attaches to the distal end of the mylohyoid ridge.

Submandibular fossa: a concave area in the mandible that is inferior and distal to the mylohyoid ridge. It has little significance in impression making.

Lingual vestibule: 3 areas

1. The anterior lingual vestibule (sublingual crescent area): influenced by the genioglossus muscle, the lingual frenum and sublingual glands.

2. The middle vestibule (mylohyoid area): the largest area and influenced by the mylohyoid muscle.

3. The distolingual vestibule (lateral throat form) or retromylohyoid area:

Boundaries of retromylohyoid area:

-anterior: mylohyoid muscle

-lateral: pear-shaped pad

-posterolaterally: superior constrictor muscle

-posteromedially: palatoglossus muscle

-medially: the tongue

-the “S” curve, as viewed from the lingual, results from the stronger intrinsic and extrinsic tongue muscles.

-The posterior limit of the mandibular denture is determined by the palatoglossus muscle and somewhat by the superior constrictor.

Category: Prosthodontics Notes



Post a Comment