L2: Intra-oral anatomical landmarks

Question 1

what is the primary stress bearing area ?

Answer 1

crest of maxillary ridge

Question 2

incisive papilla covers the incisive foramen at the anterior end of the median palatine raphe which contains :

Answer 2

nasopalatine N. & V.
-pressure on which will result in a burning sensation for the patient which is why this area should be relived when producing dentures

Question 3

other important notes on the incisive papilla :

Answer 3

• guide for antro-posterior position of centrals

-line drawn posterior to it , perpendicular to the midline indicates canine position

Question 4

where is the palatine rugae and what is its importance ?

Answer 4

-elevation in soft extending laterally from midline in anterior part of hard palate

-important for pronunciation of S sound
-serves as one of stress bearing areas in palate

Question 5

median palatine raphe is:

Answer 5

relieved in denture to avoid rocking or midline fracture

Question 6

bony projections of palatine bone :

Answer 6

torus palatinus
-if small they are relived by dentures to avoid rocking but if they are large they need to be surgically removed

Question 7

what is the secondary stress bearing area in the maxilla?

Answer 7

maxillary tuberosity (provides resistance against lateral movments

Question 8

where is the root of the zygomatic arch located ?

Answer 8

lower portion of zygomatic process of maxilla , above first molar
-it is both a supporting structure and a limiting structure

Question 9

fovea palatinus importance :

Answer 9

posterior border of upper denture should be 2mm posterior to fovea platinus

Question 10

residual alveolar ridge of mandible is used as:

Answer 10

secondary load bearing area only if it is thick enough

Question 11

retro-molar pad should be:

Answer 11

covered by denture for retention ->lower peripheral seal

Question 12

external oblique ridge is a ___ structure

Answer 12

limiting and support .lower denture should not extend beyond it so it does not come in contact with masseter muscle influence area and avoid denture displacement

Question 13

primary stress bearing area in lower arch:

Answer 13

buccal shelf of bone , area that lies between crest of residual alveolar ridge and external oblique ridge

Question 14

pressure on mental foramen causes:

Answer 14

numbness of the lower lip and should be relived

Question 15

mental foramen , in case of excessive bone resorption may be located :

Answer 15

at crest of mandibular ridge

Question 16

bony prominences located on the inner surface of the body of mandible at the symphysial region :

Answer 16

genial tubercles
-with excessive bone resorption it can be found at the crest of the mandibular ridge which causes ulceration of overlying soft tissue with pressure and should be relived

Question 17

which muscle is attached to the internal oblique ridge ?

Answer 17

mylohyoid muscle

-if the ridge is prominent then it should be relived or surgically removed