27 Questions
What is the apparent location of the mandibular canal on radiographs?
Between the mandibular foramen & the mental foramen
Where is the mental foramen located?
Between the lower border of the mandible and the alveolar crest
In what percentage of patients are nutrient canals visible on radiographs?
5%
What is the mylohyoid ridge also known as?
Internal oblique ridge
Where can the external oblique ridge be located?
Near the alveolar crest in the mandibular 3rd molar region
What is the submandibular gland fossa?
A depression immediately below the mylohyoid ridge in molar region
'A continuation of the ant. border of ramus' describes which landmark?
External oblique ridge
'A dense, broad, R-O band' is a characteristic of which anatomical feature?
Inferior border of mandible
What is Zone 5 in a panoramic radiograph primarily associated with?
Inferior border of Mandible
What is the composition of the periodontal ligament space?
It is composed primarily of collagen
Where is the enamelodentin junction located?
At the edge of the tooth near the CEJ
Which part of the tooth is the densest?
Enamel
What makes it difficult to see the dentin-enamel junction in a poor contrast radiograph?
High density of dentin
What is the primary component of the supporting structure known as lamina dura?
Hardened bone
Which structure forms a radiolucent space separating the root and lamina dura?
Periodontal ligament space
What is the function of the lamina dura?
To form a boundary for the tooth socket
Which condition is indicated by thickening of the lamina dura and widening of PDL space?
Bone loss
What is the composition of the alveolar bone?
Cortical and cancellous bone
What is the characteristic feature of cancellous bone?
Fine, granular pattern
Which structure comprises the buccal and palatal plates of the maxilla and mandible?
Cortical bone
What does horizontal bone loss indicate?
Periodontal disease
What is the characteristic feature of vertical bone loss (angular)?
Crestal alveolar resorption
What is the anatomical composition of the maxilla sinus?
Air-filled cavity with mucosa lining
What is sinus pneumatization in dental radiography?
Enlargement near apices of upper premolars & molars
What are septa in the maxillary sinus?
Folds of cortical bone dividing the sinus into compartments
What is a significant radiographic feature associated with zygomatic process and zygomatic bone?
Elevation into the floor of the sinus
What does the presence of coronoid process indicate on periapical film?
Elevation into the floor of the sinus
Study Notes
Radiographic Anatomy of the Mandible and Maxilla
- The mandibular canal appears as a radiolucent band on radiographs, traversing the mandible horizontally.
- The mental foramen is located near the apex of the mandibular first premolar.
- Nutrient canals are visible on radiographs in approximately 15% of patients.
Bony Landmarks
- The mylohyoid ridge is also known as the internal oblique ridge.
- The external oblique ridge is located on the ramus of the mandible.
- The submandibular gland fossa is a depression in the medial aspect of the body of the mandible.
Anatomical Features
- The anteriormost part of the ramus of the mandible is also known as the continuation of the anteriormost border of the ramus.
- The dense, broad, radiopaque band is a characteristic of the mylohyoid ridge.
- Zone 5 in a panoramic radiograph is primarily associated with the mandibular canal.
Tooth Structure
- The periodontal ligament space is composed of a thin layer of radiolucent tissue surrounding the root of the tooth.
- The enamel-dentin junction is located at the crown of the tooth.
- The dentin is the densest part of the tooth.
- The dentin-enamel junction is difficult to see on a poor contrast radiograph due to the similar radiodensities of enamel and dentin.
Supporting Structures
- The lamina dura is composed primarily of compact bone.
- The periodontal ligament space separates the root of the tooth from the lamina dura.
- The function of the lamina dura is to support the tooth.
- Thickening of the lamina dura and widening of the PDL space indicate periodontal disease.
Alveolar Bone
- The alveolar bone is composed of compact and cancellous bone.
- The characteristic feature of cancellous bone is its spongy, porous appearance.
- The buccal and palatal plates of the maxilla and mandible comprise the alveolar bone.
Bone Loss
- Horizontal bone loss indicates a uniform loss of alveolar bone around the tooth.
- The characteristic feature of vertical bone loss (angular) is a V-shaped defect in the alveolar bone.
Maxilla Sinus
- The anatomical composition of the maxilla sinus includes air-filled cavities lined by a thin layer of mucous membrane.
- Sinus pneumatization in dental radiography refers to the expansion of the maxilla sinus into the surrounding bone.
- Septa are thin bony partitions that divide the maxillary sinus into multiple compartments.
- A significant radiographic feature associated with the zygomatic process and zygomatic bone is their radiopaque appearance.
Radiographic Features
- The presence of the coronoid process on a periapical film indicates the presence of a normal anatomic structure.
Test your knowledge of anatomical landmarks in oral and maxillofacial radiology with this quiz. Topics include teeth supporting structures, enamel, dentin, and cementum.
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