Normal Anatomic Structures Short Essays

Normal Anatomic Structures Short Essays

Question 1. Anatomical landmarks in upper posterior periapical radiograph
Answer.

Anatomic Landmarks In Maxillary Posterior Region Are:

  • Maxillary sinus
  • Inverted Y – configuration
  • Maxillary tuberosity
  • Hamular notch
  • Medial and lateral pterygoid plates
  • Zygomatic process
  • Zygomatic bone

Oral Radiology Normal Anatomic Structures Anatomic Landmarks In Maxillary Posterior Region

Question 2. Normal radiographic anatomy of teeth and supporting structures.
Answer:

Anatomic Landmarks In Maxillary Anterior Region Are:

  • Incisive foramen
  • Superior foramina of incisive canal
  • Median palatine suture
  • Lateral fossa
  • Nasal fossa
  • Nasal septum
  • Floor of nasal cavity
  • Anterior nasal spine
  • Inferior nasal concha
  • Nasolacrimal canal
  • Nose
  • Inverted Y

Read And Learn More: Oral Radiology Question and Answers

Anatomic Landmarks In Maxillary Posterior Region Are:

  • Maxillary sinus
  • Inverted Y – configuration
  • Maxillary tuberosity
  • Hamular notch
  • Medial and lateral pterygoid plates
  • Zygomatic process
  • Zygomatic bone

Anatomic Landmarks In Mandibular Region

  • Genial tubercle
  • Nutrient canal
  • Submandibular gland fossa
  • Sublingual gland fossa
  • Retromolar triangle

Normal Anatomic Structures Short Answers

Question 1. Normal anatomical landmarks in maxillary anterior region.
Answer.

Normal anatomical landmarks in maxillary anterior region

Oral Radiology Normal Anatomic Structures Normal anatomical landmarks in maxillary anterior region

Question 2. Radiographic appearance of mandibular canal.
Answer.

Radiographic appearance of mandibular canal

  • Radiographically it appears as a radiolucent band
  • It is outlined by two thin radiopaque lines that represents the cortical walls of the canal
  • It may appear below or superimposed on the Mandibular molar teeth
  • It extends from the Mandibular foramen to the mental foramen
  • It houses the inferior alveolar nerve and the blood vessels
  • It is a tube like – passage through the bone that travels the length of the mandible

Oral Radiology Normal Anatomic Structures The external oblique ridge and the mandibular canal

Question 3. Line of ennis.
Answer.

Line of ennis

  • It is the intersection of the maxillary sinus and the nasal cavity
  • On radiograph it appears as
    • A radiopaque upside down “Y” formed by the intersection of the floor of the nasal fossa and the anterior border of the maxillary sinus
    • It is located above the maxillary canine

Oral Radiology Normal Anatomic Structures The floor of the nasal fossa

Question 4. Lamina dura.
Answer.

Lamina dura

  • This is the wall of the tooth socket that surrounds the tooth
  • It is made up of dense cortical bone
  • On radiograph it appears as
    • A thin radiopaque line that surrounds the root of the tooth
    • It is continuous with the shadow of the cortical bone at the alveolar crest
    • It is slightly thicker than the trabeculae of the cancellous bone in the area
    • When the X-ray beam is directed throught the relatively long expanse of the structure, the lamina dura appears radiopaque and well defined
    • When the beam is directed more obliquely, the lamina dura appears more diffuse
    • The thickness and density of the lamina dura will vary with the amount of occlusal stresses
    • It is wider and more dense around the roots of teeth in heavy occlusion
    • It is thinner and less dense around teeth not subjected to occlusion function
    • Double lamina dura image appears if the mesial or distal surfaces of the roor present two elevations in the path of the X-ray beam
    • Presence of an intact lamina dura around the tooth indicate a vital pulp,
    • However in some cases its absence may be normal

Question 5. Anatomical landmarks of maxillary
Answer:

Anatomic Landmarks In Maxillary Anterior Region Are:

  • Incisive foramen
  • Superior foramina of incisive canal
  • Median palatine suture
  • Lateral fossa
  • Nasal fossa
  • Nasal septum
  • Floor of nasal cavity
  • Anterior nasal spine
  • Inferior nasal concha
  • Nasolacrimal canal
  • Nose
  • Inverted Y

Anatomic Landmarks In Maxillary Posterior Region Are:

  • Maxillary sinus
  • Inverted Y – configuration
  • Maxillary tuberosity
  • Hamular notch
  • Medial and lateral pterygoid plates
  • Zygomatic process

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