maxillary anatomy Flashcards
Lamina Dura
The teeth sockets are
bounded by a thin
radiopaque layer of dense
bone.
lamina dura
Alveolar Crest
Is the gingival margin of the alveolar
process between teeth (radiopaque
line).
alveolar crest
alveolar crest
Periodontal Ligament Space
It appears as a radiolucent space
between the tooth root and the
lamina dura
PDL space
A double periodontal ligament space and lamina dura (arrows) may be seen when?
when there is a convexity of the proximal surface of the root resulting in two heights of contour.
Cancellous or trabecular Bone
The cancellous bone lies between the cortical
plates in both jaws.
trabecular plates
marrow spaces
Anterior Nasal Spine
Anterior Nasal Spine
It is usually at or just below the
junction of the inferior end of the
nasal septum and the inferior
outline of the nasal aperture.
ant nasal spine
ant nasal spine
Intermaxillary Suture
▪Median suture
▪Extends from alveolar crest between #8 and #9 posteriorly to distal aspect of hard palate
▪Uniform width
▪Variable shape due to Angulation of central ray
intermaxillary suture
intermaxillary suture
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
nasopalatine canal anatomy
stensen foramen of NP canal
green arrows
stensen foramen
Incisive Foramen
Incisive Foramen
▪Is the oral end of the nasopalatine canal
▪Variable size and shape
▪Variable position, due to x-ray beam angulation
incisive foramen
incisive foramen
Nasal cavity
▪Is located above the oral cavity.
▪Its floor is seen as a thin
radiopaque line
nasal cavity
nasal cavity
lateral? posterior?
extensions of the nasal cavity
Floor of the nasal cavityextending laterally from the anterior nasal spine.
The floor of the nasal aperture (arrows) extends posteriorly, superimposed over the maxillary sinus.
inf nasal concha
nasal septum
MAXILLARY SINUS
MAXILLARY SINUS
▪Is an air-containing cavity lined with mucous membrane.
▪The borders appear in periapical radiographs as a thin and radiopaque line near apices
▪May have internal septa
inf border of max sinus
mx sinus response to missing teeth
The floor of the maxillary sinus (arrows) often extends toward the crest of the alveolar ridge in response to missing teeth
max sinus with missing teeth
septum in max sinus
neurovascular canals in the wall of the max sinus
neurovascular canals in the wall of the max sinus
What is the “Inverted Y”?
Formed by nasal fossa
and maxillary sinus
inverted Y
max sinus and nasal fossa
Nose in radiographs
▪The soft tissue of the tip of the nose
can be seen in projections of the
maxillary incisors, superimposed over
the roots.
nose soft tissue
Lateral Fossa
Lateral Fossa
▪Is a depression in the maxilla near
the apex of the lateral incisor.
▪It is formed by a depression in the
maxilla at this location.
The lateral fossa is a diffuse radiolucency in the region of the lateral incisor.
lateral fossa
lateral fossa
Nasolacrimal Canal
▪Runs from the orbit inferiorly
to the nasal cavity.
Occasionally seen near the apex of the canine
when steep vertical angulation is used.
The nasolacrimal canals are commonly seen as ovoid radiolucencies on maxillary occlusal projections.
NL canal
NL canal
ZYGOMATIC PROCESS OF
THE MAXILLA
▪The zygomatic process of the maxilla is anextension of the lateral maxillary surface that articulates with the maxillary process of the zygoma.
zygomatic process
zygomatic process
zygoma
NASOLABIAL FOLD
▪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.
The nasolabial soft tissue fold extends across the canine-premolar region.
Nasolabial fold
distal area
tuberosity
Pterygoid Plates and Hamular notch
▪The medial and lateral pterygoid
plates lie immediately posterior to
the tuberosity of the maxilla.
hamular process
pterygoid plates posterior to tuberosity
hamular process
