Anatomical Landmarks for Complete Dentures Flashcards
what groups are landmarks of the edentulous jaw grouped into
limiting structures
supporting structures
relief areas
what are examples of limiting structures in the maxilla
labial frenum
labial sulcus
buccal frenum
buccal sulcus
vibrating line
hamular notch
what does the landmark of labial frenum and labial sulcus aid in
guide us in having optimum extension of the denture
what is the labial frenum
fibrous band covered by mucous membrane extending from labial aspect of residual ridge to lip
what is a V shaped/ labial notch
a notch provided carefully on the denture which is narrow but deep enough to avoid interference and seats adequately around the frenum
if the denture encroaches on limiting structures what will occur
dislodgement of the denture and/ or soreness of the area
what will occur if the areas leading up to limiting areas are not covered
decreased retention stability and support
what does the size of the buccal vestibule depend on
contraction of buccinator muscle
position of the mandible
amount of bone loss in maxilla
what are examples of relief areas in the maxilla
incisive papilla
palatine raphe
palatine fovea
crest of alveolar ridge
what are relief areas
areas where there are either resorption under constant load, having fragile structures within or covered by thin mucosa which can be easily traumatised
how should dentures be designed in regards to relief areas
so that masticatory load is not concentrated over these areas
what exits via the incisive foramen
nasopalatine nerves and vessels
what could happen if masticatory forces are concentrated over the incisive papilla
necrosis of distributing areas and paraestheisa of the anterior palate
what is the palatine raphe
extends from incisive papilla to distal end of hard palate
most sensitive part of the palate to pressure
what is the palatine fovea
the very end of the palatine raphe at the demarkation between hard and soft palates
what is the vibrating line
an imaginary line that marks division between movable and immovable tissue of the soft palate
extends from one hamular notch to the other
what is the hamular notch
depression between maxillary tuberosity and the hamulus of the medial pterygoid plate - soft area of loose connective tissue
where is the disto-lateral termination of the denture
hamular notch
what landmark aids in achieving the posterior palatal seal
hamular notch
what are supporting structures examples in the maxilla
rugae
posterior palate
tuberosity
what are rugae
folded-like appearance of mucosa behind the upper incisors
what is support
the resistance to the displacement towards the underlying structures
what is a primary stress bearing area
posterior palate
what is a secondary stress bearing area
rugae
tuberosity
what are limiting structures in the mandible
labial frenum
labial sulcus
buccal sulcus
buccal frenum
alveilolingual sulcus
lingual frenum
retroomolar pads
what is the alveololingual sulcus
between lingual frenum to retromylohyoid curtain
what does overextension of a denture into the alveololingual sulcus cause
soreness and instability
what are examples of relief areas in the mandible
genial tubercle
torus mandibularis
mylohyoid ridge
what is the genial tubercle
area of muscle attachment for genioglossus and geniohyoid
when can the genial tubercle become quire prominent
resorbed ridges
what is the torus mandibularis
abnormally bony prominence bilaterally on the lingual side near premolar area
what is the mylohyoid ridge
attachment for mylohyoid muscle
runs along the lingual surface of mandible
what are retoromolar pads
pear shaped triangular soft pads of tissue at the dital end of lower ridge
what forms the posterior seal of a mandibular denture
retromolar pads
how far should the denture base extend up the retromolar pad triangle
2/3rds
what are examples of supporting structures in the mandible
residual alveolar ridge
buccal shelf
what are examples of secondary stress bearing areas in the mandible
residual alveolar ridge
what is the buccal shelf
extends from buccal frenum to retromolar pad
between the external oblique ridge and crest of alveolar ridge
