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BDS3 Prosthodontics > Anatomical Landmarks for Complete Dentures > Flashcards

Anatomical Landmarks for Complete Dentures Flashcards

1
Q

what groups are landmarks of the edentulous jaw grouped into

A

limiting structures
supporting structures
relief areas

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2
Q

what are examples of limiting structures in the maxilla

A

labial frenum
labial sulcus
buccal frenum
buccal sulcus
vibrating line
hamular notch

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3
Q

what does the landmark of labial frenum and labial sulcus aid in

A

guide us in having optimum extension of the denture

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4
Q

what is the labial frenum

A

fibrous band covered by mucous membrane extending from labial aspect of residual ridge to lip

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5
Q

what is a V shaped/ labial notch

A

a notch provided carefully on the denture which is narrow but deep enough to avoid interference and seats adequately around the frenum

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6
Q

if the denture encroaches on limiting structures what will occur

A

dislodgement of the denture and/ or soreness of the area

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7
Q

what will occur if the areas leading up to limiting areas are not covered

A

decreased retention stability and support

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8
Q

what does the size of the buccal vestibule depend on

A

contraction of buccinator muscle
position of the mandible
amount of bone loss in maxilla

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9
Q

what are examples of relief areas in the maxilla

A

incisive papilla
palatine raphe
palatine fovea
crest of alveolar ridge

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10
Q

what are relief areas

A

areas where there are either resorption under constant load, having fragile structures within or covered by thin mucosa which can be easily traumatised

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11
Q

how should dentures be designed in regards to relief areas

A

so that masticatory load is not concentrated over these areas

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12
Q

what exits via the incisive foramen

A

nasopalatine nerves and vessels

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13
Q

what could happen if masticatory forces are concentrated over the incisive papilla

A

necrosis of distributing areas and paraestheisa of the anterior palate

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14
Q

what is the palatine raphe

A

extends from incisive papilla to distal end of hard palate
most sensitive part of the palate to pressure

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15
Q

what is the palatine fovea

A

the very end of the palatine raphe at the demarkation between hard and soft palates

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16
Q

what is the vibrating line

A

an imaginary line that marks division between movable and immovable tissue of the soft palate
extends from one hamular notch to the other

17
Q

what is the hamular notch

A

depression between maxillary tuberosity and the hamulus of the medial pterygoid plate - soft area of loose connective tissue

18
Q

where is the disto-lateral termination of the denture

A

hamular notch

19
Q

what landmark aids in achieving the posterior palatal seal

A

hamular notch

20
Q

what are supporting structures examples in the maxilla

A

rugae
posterior palate
tuberosity

21
Q

what are rugae

A

folded-like appearance of mucosa behind the upper incisors

22
Q

what is support

A

the resistance to the displacement towards the underlying structures

23
Q

what is a primary stress bearing area

A

posterior palate

24
Q

what is a secondary stress bearing area

A

rugae
tuberosity

25
Q

what are limiting structures in the mandible

A

labial frenum
labial sulcus
buccal sulcus
buccal frenum
alveilolingual sulcus
lingual frenum
retroomolar pads

26
Q

what is the alveololingual sulcus

A

between lingual frenum to retromylohyoid curtain

27
Q

what does overextension of a denture into the alveololingual sulcus cause

A

soreness and instability

28
Q

what are examples of relief areas in the mandible

A

genial tubercle
torus mandibularis
mylohyoid ridge

29
Q

what is the genial tubercle

A

area of muscle attachment for genioglossus and geniohyoid

30
Q

when can the genial tubercle become quire prominent

A

resorbed ridges

31
Q

what is the torus mandibularis

A

abnormally bony prominence bilaterally on the lingual side near premolar area

32
Q

what is the mylohyoid ridge

A

attachment for mylohyoid muscle
runs along the lingual surface of mandible

33
Q

what are retoromolar pads

A

pear shaped triangular soft pads of tissue at the dital end of lower ridge

34
Q

what forms the posterior seal of a mandibular denture

A

retromolar pads

35
Q

how far should the denture base extend up the retromolar pad triangle

A

2/3rds

36
Q

what are examples of supporting structures in the mandible

A

residual alveolar ridge
buccal shelf

37
Q

what are examples of secondary stress bearing areas in the mandible

A

residual alveolar ridge

38
Q

what is the buccal shelf

A

extends from buccal frenum to retromolar pad
between the external oblique ridge and crest of alveolar ridge

BDS3 Prosthodontics (4 decks)

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