Anatomical Landmarks and Teeth Supporting Structures Quiz

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Questions and Answers

What is the function of lamina dura?

  • It is a thin R-O line near the apices of upper premolars and molars
  • It supports the tooth and is composed of cancellous and cortical bone
  • It forms a sharp angle and indicates periodontal disease
  • It's the bony wall of the tooth socket and surrounds the PDL (correct)

Which structure is composed of cancellous and cortical bone and supports the tooth?

  • Cortical bone
  • Cancellous bone
  • Lamina dura
  • Alveolar bone (correct)

What is the typical appearance of nasal fossa in radiographs?

  • A small rounded or oval R-L between the roots of the Mx central incisors
  • A R-O band that separates the right and left nasal fossa (correct)
  • A R-O image arising in the midline from the ant. nasal spine
  • A slightly opaque appearance with sharp border

What does the incisive foramen transmit?

<p>Nasopalatine vessels and nerves (B)</p> Signup and view all the answers

Which anatomical structure forms a complete septa dividing the maxillary sinus into individual compartments in 1-10% of cases?

<p>Maxillary sinus (A)</p> Signup and view all the answers

What causes small elevations into the floor of the maxillary sinus in periapical radiographs?

<p>Root apices (B)</p> Signup and view all the answers

What is the function of genial tubercle?

<p>To visualize it on standard mandibular occlusal film (B)</p> Signup and view all the answers

Which structure extends posteriorly from the inferior border of the zygomatic process of maxilla?

<p>Zygomatic bone (C)</p> Signup and view all the answers

What is frequently apparent on periapical film of the maxillary molars region?

<p>Coronoid process (D)</p> Signup and view all the answers

What does the symphysis suture fuse by the end of the first year of life?

<p>Mental fossa (A)</p> Signup and view all the answers

What is well visualized on standard mandibular occlusal film as one or more projections?

<p>Genial tubercle (D)</p> Signup and view all the answers

What is the apparent location of the mental foramen on radiographs?

<p>At the level of apices of the 2nd premolar (D)</p> Signup and view all the answers

Which structure does the mylohyoid ridge attach to?

<p>Mylohyoid muscle (C)</p> Signup and view all the answers

What is the main characteristic of nutrient canals on radiographs?

<p>Running vertically from the inf. dental canal to the apex of tooth (B)</p> Signup and view all the answers

Where is the submandibular gland fossa located?

<p>Below the mylohyoid ridge (A)</p> Signup and view all the answers

What is a distinguishing feature of an external oblique ridge on radiographs?

<p>Near the alveolar crest in the mandibular 3rd molar region (A)</p> Signup and view all the answers

What is the defining characteristic of an inferior border of the mandible on radiographs?

<p>A dense, broad, R-O band (D)</p> Signup and view all the answers

On panoramic radiographs, what type of image results from a single anatomical structure?

<p>Single Real Image (C)</p> Signup and view all the answers

What causes a ghost image on radiographs?

<p>Dense anatomical structures like the mandible (D)</p> Signup and view all the answers

What is a distinguishing characteristic of a ghost image on radiographs?

<p>Larger and projected higher on film (B)</p> Signup and view all the answers

What does Zone 5 correspond to on panoramic/orthopantomogram (OPG) images?

<p>Inferior border of Mandible (D)</p> Signup and view all the answers

What does Zone 3 correspond to on panoramic/orthopantomogram (OPG) images?

<p>Ramus &amp; spine (C)</p> Signup and view all the answers

What does Zone 4 correspond to on panoramic/orthopantomogram (OPG) images?

<p>Hyoid bone (D)</p> Signup and view all the answers

What is the densest part of the tooth?

<p>Enamel (B)</p> Signup and view all the answers

Which part of the tooth is difficult to see in poor contrast radiographs?

<p>Dentin (A)</p> Signup and view all the answers

What is the function of the PDL (Periodontal Ligament) space?

<p>To attach the tooth to the surrounding bone (D)</p> Signup and view all the answers

Which structure is composed primarily of collagen and forms a radiolucent space between the root and itself?

<p>Periodontal ligament space (A)</p> Signup and view all the answers

What is the purpose of the alveolar crest in supporting dental structures?

<p>To anchor the teeth to the jawbone (D)</p> Signup and view all the answers

What is the primary component of cementum, making it difficult to be seen?

<p>Collagen (C)</p> Signup and view all the answers

Where is the pulp chamber located in relation to the tooth?

<p>In the center of the tooth (A)</p> Signup and view all the answers

Which part of the tooth has a fine edge at the CEJ (Cementoenamel junction)?

<p>Enamel (D)</p> Signup and view all the answers

Flashcards

Lamina Dura

Thin layer of compact bone lining the tooth socket, supporting the tooth.

Alveolar Process

Bone (cancellous and cortical) that surrounds and supports the teeth.

Genial Tubercle

Attachment site for muscles and ligaments supporting the mandible.

Mylohyoid Ridge

Ridge on the mandible's lingual surface where the mylohyoid muscle attaches.

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Nasal Fossa (Radiographically)

Air-filled space in the skull that appears dark on radiographs.

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Maxillary Sinus

Air space in the maxilla, sometimes divided by septa.

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Maxillary Sinus Mucosa Elevation

Small elevations into the floor of the maxillary sinus.

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Incisive Foramen

Foramen that transmits the nasopalatine nerve and vessels.

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Mental Foramen

Radiolucent area seen on radiographs, typically between the premolars.

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Submandibular Gland Fossa

Depression on mandible's lingual aspect, below the mandibular canal.

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External Oblique Ridge

Radiopaque line on radiographs representing a ridge on the mandible.

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Inferior Border of Mandible

Radiopaque line representing the lower border of the mandible.

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Ghost Image

Overlapping, less intense image of a structure on panoramic radiographs.

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Panoramic Zone 5

Area on a panoramic radiograph where the mandible is located.

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Panoramic Zone 3

Area on a panoramic radiograph where the maxillary sinuses are located.

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Panoramic Zone 4

Area on a panoramic radiograph where the zygomatic arches are located.

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Pulp Chamber

Space within a tooth containing the pulp.

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Cementum

Calcified tissue covering the tooth root, primarily collagen.

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Periodontal Ligament (PDL) Space

Space between the tooth root and the alveolar bone.

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PDL Space Function

Space allowing tooth movement and passage for vessels and nerves.

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Enamel

The hardest, most radiopaque tissue in the human body.

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Enamel-Cementum Junction (ECJ)

Where enamel of the crown meets cementum of the root.

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Symphysis Suture

Suture which normally fuses within the first year of life.

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Study Notes

Bone and Supporting Structures

  • Lamina dura is a thin layer of compact bone that lines the socket and supports the tooth.
  • The alveolar process is composed of cancellous and cortical bone and supports the tooth.
  • The genial tubercle provides attachment sites for muscles and ligaments that support the mandible.
  • The mylohyoid ridge attaches to the mandible.

Sinus and Nasal Fossa

  • Nasal fossa typically appears as a dark, radiolucent area on radiographs.
  • The maxillary sinus is divided into individual compartments by a complete septa in 1-10% of cases.
  • Small elevations into the floor of the maxillary sinus on periapical radiographs are caused by the maxillary sinus mucosa.
  • The incisive foramen transmits the nasopalatine nerve and vessels.

Radiographic Appearance

  • The mental foramen appears as a radiolucent area on radiographs, typically located between the first and second premolars.
  • The submandibular gland fossa is located on the lingual aspect of the mandible, below the mandibular canal.
  • The external oblique ridge appears as a radiopaque, curved line on radiographs.
  • The inferior border of the mandible appears as a radiopaque, continuous line on radiographs.
  • On panoramic radiographs, a single anatomical structure can produce a double image, known as a ghost image.
  • Ghost images are characterized by a less intense, overlapping image of the original structure.

Panoramic/Orthopantomogram (OPG) Images

  • Zone 5 on panoramic/OPG images corresponds to the mandible.
  • Zone 3 on panoramic/OPG images corresponds to the maxillary sinuses.
  • Zone 4 on panoramic/OPG images corresponds to the zygomatic arches.

Tooth Structure

  • The pulp chamber is located in the center of the tooth, above the root canal.
  • Cementum is composed primarily of collagen, making it difficult to see on radiographs.
  • The periodontal ligament (PDL) space is a radiolucent space between the root and surrounding bone.
  • The PDL space allows for tooth movement and provides a pathway for vessels and nerves.
  • The enamel is the densest part of the tooth.
  • The enamel-cementum junction (ECJ) has a fine edge.

Sutures

  • The symphysis suture fuses by the end of the first year of life.

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