Maxilla Anatomy Flashcards
describe the lamina dura
the teeth sockets are bounded by a thin radiopaque layer of dense bone
what is the alveolar crest
the gingival margin of the alveolar process between teeth - radiopaque lines
the alveolar crests are seen as cortical borders of_____
alveolar bone
what is the alveolar crest continuous with
the lamina dura
describe the periodontal ligament space
appears as a radiolucent space between the tooth root and the lamina dura
when would a double periodontal ligament space and lamina dura be seen
when there is a convexity of the proximal surface of the root resulting in two heights of contour
where is the cancellous bone located
between cortical plates in both jaws
what nerve is located in the pterygoid palatine fossa
V2
where is the anteiror nasal spine
at or just below the junction of the inferior end of the nasal septum and the inferior outline of the nasal aperture
describe the intermaxillary suture
- median suture
- extends from alveolar crest between #8 and #9 posteriorly to distal aspect of hard palate
- uniform width
- variable shape depending on angulation of central ray
describe the nasopalatine canal
- transmits nasopalatine nerves and vessels
- terminates in incisive foramen
- entrance foramina: two usually round or oval foramina in the floor of the nasal cavity
- not always seen
where does the superior foramina of the nasopalatine canal appear
lateral to the nasal septum and posterior to the anterior nasal spine
where do the lateral walls of the nasopalatine canal extend from
the incisive formamen to the floor of the nasal fossa
describe the incisive foramen
- the oral end of the nasopalatine canal
- variable size and shape
- variable position, due to x ray beam angulation
where does the incisive foramen appear on a radiograph
an ovoid radiolucency between the roots of the central incisors
describe the nasal cavity
- located above the oral cavity
- floor is seen as a thin radiopaque FLAT line
what is the intersection of the floor of the nasal cavity and the maxillary sinus called
inverted Y
where does the maxillary sinus start
at the level of the PM
describe the maxillary sinus
- an air containing cavity lines with mucous membrane
- the borders appear in periapical radiographs as a thin and radiopaque line
- may have internal septa
- usually looks wavy
describe the portion of the nose that can be seen in radiographs
the soft tissue of the tip of the nose can be seen in projections of the maxillary incisors, superimposed over the roots
describe the lateral fossa
- a depression in the maxilla near the apex of the lateral incisor
- formed by a depression in the maxilla at this location
- located in between the lateral and the canine
where is the nasolacrimal canal
runs from the orbit inferiorly to the nasal cavity
when can nasolacrimal glands be seen in a radiograph
- on maxillary occlusal projections
- when steep vertical angulation is used
describe the zygomatic process of the maxilla
- an extension of the lateral maxillary surface that articulates with the maxillary process of the zygoma
describe the nasolabial foldd
- radiographically is an oblique line demarcating a region that appears to be covered by a veil of slight radiopacity
- frequently traverses periapical radiographs of the premolar region
where are the pterygoid plates located
immediately posterior to the tuberosity of the maxilla
where is the hamular process
extends inferiorly from the medial pterygoid plate
