Radiographic Interpretation of 16-3-2020.pdf · Radiographic Interpretation of Dental and...
Transcript of Radiographic Interpretation of 16-3-2020.pdf · Radiographic Interpretation of Dental and...
Radiographic Interpretation of
Dental and Maxillofacial Trauma
By
Dr. Ahmed M. Bakry Lecturer of Oral Radiology, Faculty of Dentistry, Minia University
Radiographic signs of fracture:
1- The presence of a radiolucent line (usually sharply
defined) within the anatomic boundaries of the structure.
2- A change in the normal anatomic outline or shape of the
structure.
3- A defect in the outer cortical boundary, which may
appear as a deviation in the smooth outline, a gap in the
outer cortical bone, or a step-like defect.
4- An increase in the density of the bone, which may be
caused by the overlapping of two fragments of bone.
Concussion
Avulsion Luxation
Fracture
Concussion
Crushing injury to the vascular structures at the
tooth apex and to the periodontal ligament,
resulting in inflammatory edema. Only minimal
loosening or displacement of the tooth occurs
Concussion
Widening of the periodontal ligament space Reduction in the size of the pulp chamber and pulp canals Increase in the width of the pulp chamber and canals Peri apical lesion Internal root resorption may occur
Luxation
Dislocation of the articulation of the tooth.
Such teeth are both abnormally mobile and
displaced
Luxation
Widening of the periodontal ligament space Slight elevation of the tooth may not be radio graphically apparent. Depressed position of the crown of an intruded tooth is often apparent Peri apical lesion
Avulsion
•Complete displacement of a tooth from the alveolar process. •Teeth may be avulsed by direct trauma when the force is applied directly to the tooth, or by indirect trauma . •Avulsion occurs in about 15% of traumatic injuries to the teeth.
Avulsion
lamina dura of the empty socket is apparent. New bone replacing the socket may be very dense and radiopaque and may appear similar to a retained root .
Fractures of the teeth
Radiograph provides information
regarding the location and extent of the
fracture and the relationship to the
pulp chamber as well as the stage
of root 0development of
the involved tooth
Le Fort I fracture:
The fracture line passes
above the teeth, below
the zygomatic process,
and through the maxillary
sinuses and tuberosities
to the inferior portion of
the pterygoid processes.
Le Fort II fracture:
• Separates maxilla from
base of skull.
• Fracture line extends
through lacrimal bones,
floor of orbit, through
zygomaticomaxillary
suture.
Le Fort III fracture :
• Fracture line extends
through nasal bones,
frontal process of maxilla,
across the orbit, and
zygomatico-frontal suture,
separates pterygoid plates
• May involve mandibular
fracture
• Unilateral fractures involving the
zygoma are of two types:
zygomatic arch fractures, in
which just the arch is fractured
and zygomatic complex
fractures, in which the zygomatic
bone is separated from its frontal,
maxillary, and temporal
connections.
• Bilateral zygomatic fractures
occur in association with Le Fort
II and III fractures.