Lecture 5 - Normal Anatomy Flashcards

1
Q

Enamel

A

Most radiopaque
Densest substance in body
90% mineralized

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2
Q

Dentin

A

75% mineralized

Meets with enamel at DEJ

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3
Q

Pulp

A

Soft tissue from interior of crown to apex of roots
Radiolucent
Pulp chamber decreases with age due to secondary dentin deposition (apex to crown)

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4
Q

Secondary dentin deposition

A
Age
Acute trauma
Caries
Erosion
Attrition
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5
Q

Cementum

A

50% mineralized
Thin layer, mainly on root surface
Meets with enamel at CEJ
Can’t be seen on radiograph, same density as dentin

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6
Q

Cause of divergent roots

A

1) Tooth and roots still developing - in a mature tooth, the pulp walls in apical region constrict
2) Trauma such as bruxism

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7
Q

Dental papilla

A

Forms dentin and primordial pulp

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8
Q

Cervical burnout

A

Normal

Radiolucent area b/t enamel and crest of alveolar ridge

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9
Q

Lamina dura

A

Thin, radiopaque, well-defined layer of dense bone that surrounds the tooth socket
Continuous with cortical bone at alveolar crest
Thicker/denser with greater occlusal stress
Intact lamina dura usually indicates vital pulp

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10
Q

Alveolar crest

A

Radiopaque line represents gingival margin of alveolar process b/t teeth
Continuous and forms sharp angle with lamina dura
Shorter in anterior teeth than posterior
Recedes with age & periodontal disease

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11
Q

Periodontal ligament

A

Composed of collagen
Radiolucent space b/t root and lamina dura
Extends whole tooth from alveolar crests
Thinner at root apex, wider at alveolar crest

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12
Q

Intermaxillary suture

A

Thin, radiolucent line in midline of maxilla
B/t central incisors superior to anterior nasal spine and posterior b/t palatine processes to the posterior aspect of the hard palate
Bordered by radiopaque thin cortical bone lines

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13
Q

Anterior nasal spine

A

Radiopaque at junction of the inferior end of nasal septum, between maxillary central incisors
1.5-2 cm above alveolar crest

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14
Q

Nasal fossa

A

Air-filled
Radiolucent
Inferior border is radiopaque lines extending bilaterally from base of anterior nasal spine

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15
Q

Incisive/nasopalatine foramen

A

Oral terminus of nasopalatine canal
Vessels and nerves to max. central incisors
Radiolucent b/t roots and middle-apical 1/3 of central incisors

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16
Q

Superior foramina of nasopalatine canal

A

Origin of nasopalatine canal in floor of nasal cavity

Travel on either side of nasal septum and unite at foramen

17
Q

Lateral fossa

A

Depression in maxilla near apex of lateral incisor
Diffusely radiolucent on periapical
Not pathologic if lamina dura is intact

18
Q

Nasolacrimal canal

A

Drains under the inferior concha of nasal cavity

Above apex of canine on periapical