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Radiology > Radiographic anatomy > Flashcards

Radiographic anatomy Flashcards

1
Q

Radiolucent object is?

A

Dark grey on radiograph; low density material (weak absorber)

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2
Q

Radiopaque object is?

A

White on radiograph; high density material (strong absorber)

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3
Q

Soft tissue next to teeth will appear as very?

A

radiolucent (practically black)

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4
Q

Soft tissue next to nasal cavity will appear as slightly?

A

Radiopaque

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5
Q

Radiopacity order?

A

Enamel > Dentine/cementum > pulp

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6
Q

Dentine and cementum are the same?

A

Density

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7
Q

Root canal is often NOT seen in last _____ near apex.

A

2mm

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8
Q

What is cervical burnout?

A

Overexposure of root (under CEJ) between enamel and alveolar crest; more radiolucent but is covered with soft tissue so no caries.

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9
Q

Lamina dura

A

Bone that is immediately attached to the periodontal ligament. Marked by a radiopaque line roots in alveolar socket

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10
Q

Give an example of lamina dura

A

Flat root has more radiopaque since border of root along plane of x-ray beam is longer

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11
Q

Loss of continuity of lamina dura is a good indication of?

A

Pathology

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12
Q

Alveolar crest looks like?

A

Top of alveolar bone; radiopaque

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13
Q

Periodontal ligament space looks like?

A

Radiolucent space between lamina dura and tooth root. May appear double, depending on root anatomy

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14
Q

Trabecular/cancellous bone looks like?

A

Radiopaque bulk of alveolar bone; can have variable sized marrow spaces

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15
Q

Intermaxillary suture looks like?

A

Radiolucent line between maxillary central incisors; joint of maxillary bones. Varies based on age of patient and orientation of beam

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16
Q

Anterior nasal spine looks like?

A

Poorly defined radiopacity near roots of maxillary central incisors, usually irregular and V-shaped.

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17
Q

Anterior floor of nasal cavity looks like?

A

Horizontal radiolucency above maxillary incisor roots

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18
Q

Nasal septum looks like?

A

Middle radiopaque vertical line; frequently seen covered with mucosa

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19
Q

Inferior concha looks like

A

Radiopacity next to nasal septum

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20
Q

Incisve foramen (nasopalatine foramen) looks like?

A

Radiolucency between maxillary central incisors. Usually at level of middle to apical 1/3 of maxillary central incisors

21
Q

Superior foramen of nasopalatine canal looks like?

A

Two radiolucency on palate. Openings on either side of the nasal septum. Often mistaken as pathology

22
Q

Lateral fossa (incisive fossa) looks like?

A

Radiolucency around apex of maxillary lateral incisor. Bone around lateral incisor root apex is very thin. Characteristic shadow around the lateral incisor

23
Q

Soft tissue of nose looks like?

A

Radiopaque curved line that crosses root apex of maxillary incisors

24
Q

Nasolabial folds look like?

A

Oblique radiopaque line crossing maxillary canine and premolars.

25
Q

Lip line looks like?

A

Horizontal line crossing crowns o maxillary incisors. Soft tissue outline of lips

26
Q

Floor of maxillary sinus looks like?

A

Horizontal radiopaque line crossing maxillary molar root apexes

27
Q

Maxillary sinus looks like?

A

Radiolucency above maxillary premolars and molars.

28
Q

Inverted “Y” of Ennis looks like?

A

Where the floor of the nasal cavity crosses over with the floor of the maxillary sinus (cross in same plane); near maxillary canine and pre-molar region

29
Q

Maxillary sinus septum looks like?

A

Radiopaque vertical bony projection in middle of sinus; near roots of maxillary molars

30
Q

Neurovascular canal looks like?

A

radiolucent tube with radiopaque border near roots of maxillary molars

31
Q

Zygomatic process of maxilla (zygomatic buttress) looks like?

A

Radiopacity superior to maxillary molars. Will overlap apex of maxillary molars

32
Q

Zygomatic arch looks like?

A

Radiopaque mass that extends posteriorly. Not as radiopaque as zygomatic process

33
Q

Lateral pterygoid plates look like?

A

Horizontal radiopacity seen posterior to maxillary molars

34
Q

Hamulus process of medial pterygoid plate looks like?

A

Radiopacity seen inferior to lateral pterygoid plate

35
Q

Maxillary tuberosity looks like?

A

Radiopaque bulge distal to 3rd molars

36
Q

Hard palate looks like?

A

Horizontal radiopaque line that runs across maxillary sinus

37
Q

Soft tissue of gingival margin looks like?

A

Radiopacity seen above alveolar bone when teeth are missing. do NOT see the gingival margin in the interdental areas due to the relative opacity of the teeth.

38
Q

Genial tubercles (mental spines) looks like?

A

Central radiopaque mass on lingual surface of mandibles; inferior to roots of mandibular central incisors

39
Q

Lingual foramen looks like?

A

Central radiolucency below central incisors (rare). Rarely seen, from anastomosis of sublingual branches of lingual arteries

40
Q

Mental ridges looks like?

A

Imaging feature where cortical layers of mandible overlap to give layered effect.

41
Q

Mental fossa looks like?

A

Radiolucent area where bone indents around incisors. look for intact lamina dura to differentiated from pathology

42
Q

Mental foramen looks like?

A

Radiolucent circle under 2nd premolar root; anterior opening of mandibular canal

43
Q

Mandibular canal looks like?

A

Radiopaque lines running horizontally under mandibular molar roots, with radiolucency between the lines.
Radiolucency between is inferior alveolar nerve.
Makes periodontal ligament space look wider when superimposed.

44
Q

Nutrient canals look like?

A

Radiopaque or radiolucent lines with radiolucent centres from tooth apexes to mandibular canal. More prominent in mandibular anterior teeth.

Not sure if they are supposed to be radiopaque or radiolucent. Just look for lines leaving tooth apexes.

45
Q

Mylohyoid line (internal oblique ridge) looks like?

A

Horizontal radiopaque line crossing mandibular molar root apexes. Superior or overlapping with mandibular canal.

46
Q

Submandibular gland fossa looks like?

A

Large round radiolucency near apexes of mandibular 2nd molars. Immediately inferior to mylohyoid line.

47
Q

External oblique ridge is?

A

Radiopaque line along upper border of alveolar ridge, distal to molars; crosses roots of mandibular molars. Superior to mylohyoid line, submandibular fossa, and inferior alveolar canal.

48
Q

Inferior border of mandible looks like?

A

Radiopaque horizontal line; most inferior part

49
Q

Coronoid process looks like?

A

Radiopaque mass next to Maxillary molars in BW radiographs; separate structure from maxilla.

Radiology (7 decks)

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