Intra-oral anatomical landmarks of importance Flashcards
how is the labial frenum relived and why is it relived?
it is relived to avoid denture displacement and to avoid ulceration of the frenum.
it is relived by the use of a v-shaped notch in the denture (any frenum)
what intra-oral landmark exists in relation to the orbicularis oris and superior incisive muscles ?
labial vestibule
significance of labial vestibule :
provides peripheral seal when thickness and length of labial flange of upper denture is done correctly
which part of the denture is responsible for forming a peripheral seal in the labial vestibule ?
flange
buccal frenum is tendons of _
buccinator muscles
significance of the buccal vestibule ?
buccal flanges should extend in the buccal vestibule ( due to horizontal direction of the fibers of the buccinator muscle , its contraction will not displace the denture )
notch between maxillary tuberosity anteriorly and pterygoid hamulus posteriorly :
pterygo-maxillary notch (hamular notch)
which intra oral landmark determines the posterior limit of the upper denture ?
the hamular notch . a straight line from the hamular notch on one side to the other determines the posterior limit of the upper denture
junction between immovable and movable parts of the soft palate is called:
vibrating line
what is the significance of the vibrating line ?
posterior edge of upper denture should end at this junction to provide POSTERIOR PALATAL SEAL
width of posterior palatal seal is dependent on :
curvature of soft palate
-class 1 : gentle curvature–> broad posterior palatal seal area
-class II: medium curvature —> medium width of posterior palatal seal
-class III: sharp curvature –> narrow area for posterior palatal seal
buccal flange in the disto-buccal corner of the lower denture should ____ and why?
it should converge medially to avoid denture displacement by contraction of the masseter muscle due to the vertical and oblique fibers of this muscle
-the disto-buccal corner of the lower denture is in the masseter muscle influencing area
how should the lower denture be positioned in relation to the retro mandibular pad and the anterior border of the ramus ?
it should cover the retromolar pad and extend posteriorly till the anterior border of the mandible
if the disto-lingual border of the lower denture is over-extended and interferes with the palato-glossal arch and muscle , that will result in ____
sore throat
an elderly patient reports to the clinic shortly after getting new dentures and complains of a sore throat . the most likely error made while constructing the denture was ____
over-extension of the disto-lingual border of lower denture , causing it to come in contact with palato-glossal arch and muscle
