Chapter 21 Flashcards
The oblique ridge is most likely to be recorded on an intraoral radiograph of the:
D) mandibular posterior region.
The incisive foramen is most likely to be recorded on an intraoral radiograph of the:
A) maxillary anterior region.
The genial tubercles are most likely to be recorded on an intraoral radiograph of the:
C) mandibular anterior region.
The zygomatic process is most likely to be recorded on an intraoral radiograph of the:
B) maxillary posterior region.
Bones are solid only on the outside and honeycombed within.
TRUE
Small, interconnected trabeculae form a multitude of various-sized compartments that account for the honeycomb appearance of cancellous bone radiographically.
TRUE
Cancellous bone appears extremely radiopaque.
FALSE
Cortical bone varies in radiopacity according to the size and number of trabeculae.
FALSE
The periodontal ligament space appears as a thin radiolucent line between the lamina dura and the root of the tooth.
TRUE
Nutrient canals are thin radiolucent lines of uniform width that sometimes exhibit radiopaque borders.
TRUE
The lingual foramen is a depression on the labial aspect of the mandibular incisor area, often appearing as a generalized radiolucent area around the incisor apices.
TRUE
The nasal septum appears as a radiopaque V-shaped projection from the floor of the nasal fossa in the midline.
FALSE
An important radiographic landmark is the inverted Y, which is seen between the right and left nasal fossae.
FALSE
A thin radiopaque line delineates the midline of the palate and the junction of the right and left maxilla.
FALSE
The lingual foramen is a very small opening located in the center of the genial tubercles on the lingual side of the mandible.
TRUE
While the maxillary sinus appears radiolucent on a radiograph, the maxillary sinus walls appear radiopaque.
TRUE
A line of union of adjacent cranial or facial bones that appears radiolucent on radiographs is called a ‘suture.’
TRUE
The alveolar process is that portion of the maxilla or mandible that surrounds and supports the teeth.
TRUE
Structures that are dense and absorb or resist the passage of x-rays will appear dark or black on the radiograph.
FALSE
Examples of anatomic landmarks that appear radiolucent include ridges, spines, and tubercles.
FALSE
Examples of anatomic landmarks that appear radiopaque include foramina, canals, and sutures.
FALSE
Examples of anatomic landmarks that may appear on a maxillary anterior radiograph include the nasal septum, anterior nasal spine, and soft tissue shadow of the nose.
TRUE
Examples of anatomic landmarks that may appear on a mandibular anterior radiograph include the genial tubercles, lingual foramen, and mental ridge.
TRUE
Examples of anatomic landmarks that may appear on a mandibular posterior radiograph include the oblique ridge, mylohyoid ridge, and mental foramen.
TRUE
How does cortical bone appear on a radiograph?
Radiopaque.
What are the four small radiopaque bony crests imaged at the midline of the mandible called?
Genial tubercles.
What is the very small, circular radiolucency often observed in the middle of the radiopaque genial tubercles called?
Lingual foramen.
What is the radiopaque ridge that extends forward and downward on the lateral surface of the mandible called?
Oblique ridge.
What is a bony growth extending out from the lingual surface of the mandible called?
Torus mandibularis.
What term is applied to a large, irregularly shaped radiolucency below the mylohyoid ridge and roots of the mandibular molars?
Submandibular fossa.
What is the round radiolucency often observed near the apices of the mandibular premolars called?
Mental foramen.
What is the vertical radiopaque line separating the paired radiolucencies of the nasal cavity called?
Nasal septum.
What is the thin radiolucent line that delineates the midline of the palate and the junction of the right and left maxilla called?
Median palatine suture.
How does the lateral fossa appear on a dental radiograph?
As a radiolucency between the maxillary lateral incisor and canine teeth.
