Projection Chapter 17 Quiz & Flashcards: Craniofacial & Skull

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Questions and Answers

What type of injury can occur to the orofacial soft tissues, facial skeleton, teeth, and associated specialized soft tissues?

Orofacial deformity

Maxillofacial injury

Traumatic injury (correct)

Wounding or external violence

Which type of fracture involves enamel and dentine, but not the pulp?

Enamel fracture

Enamel–dentine fracture (correct)

Enamel infraction

Complicated crown fracture

What type of radiograph is useful for demonstrating root fractures that are minimally displaced?

Multiple periapical radiographs (correct)

Panoramic radiograph

Periapical radiograph

Lateral extraoral radiograph

Where are fractures of the alveolar process commonly found?

Anterior teeth and premolar region Signup and view all the answers

What type of injury can lead to orofacial deformity and malfunction?

Traumatic injury Signup and view all the answers

What is the ideal number of radiographs to obtain for each traumatized tooth?

Three Signup and view all the answers

What type of fracture involves enamel, coronal and radicular dentine, and cementum?

Crown–root fracture Signup and view all the answers

What type of radiograph is useful for demonstrating the location of the fracture if some bone displacement has occurred?

Lateral extraoral radiograph Signup and view all the answers

What is the primary use of the Submentovertex (SMV) projection?

To display the base of the skull, zygomatic arches fracture, and sphenoid sinuses Signup and view all the answers

Which projection is best suited to view 'sinuses'?

Waters (Occipitomental) projection Signup and view all the answers

What is the main purpose of the Reverse Towne Projection?

To evaluate patients with suspected fractures of the condyle and condylar neck Signup and view all the answers

What type of projection is used to evaluate the ramus from the angle of the mandible to the condyl?

Mandibular ramus projection Signup and view all the answers

What is the purpose of the Mandibular body projection?

To evaluate the premolar-molar region and the inferior border of the mandible Signup and view all the answers

What type of projection is used to assess the presence of unerupted teeth?

Lateral Oblique Projection Signup and view all the answers

What is unique about the Bimolar view?

It takes both the right and left sides of the mandible in one film Signup and view all the answers

Which projection is used to evaluate jaw lesions?

Lateral Oblique Projection Signup and view all the answers

Study Notes

Craniofacial and Skull Projections

Submentovertex (SMV) or Base Projection: displays the base of the skull, zygomatic arches fracture, sphenoid sinuses, hard palate, and mandible
Waters (Occipitomental) Projection: best for viewing sinuses, displays maxillary sinuses, orbital ridges and floor, frontal and ethmoid sinuses, and nasal cavity and midfacial fractures
Reverse Towne Projection: evaluates patients with suspected fractures of the condyle and condylar neck, shows the posterolateral wall of the maxillary antrum
Lateral Oblique Projection: assesses presence of unerupted teeth, fractures of the mandible, and evaluation of jaw lesions
- Mandibular ramus projection: views the ramus from the angle of the mandible to the condyl
- Mandibular body projection: demonstrates the premolar-molar region and the inferior border of the mandible
- Bimolar view: views both sides of the mandible in one film

Traumatic Injuries

Oral and maxillofacial injuries: refer to injuries of the orofacial soft tissues, facial skeleton, teeth, and associated specialized soft tissues
Can lead to orofacial deformity and malfunction, greatly diminishing quality of life and worker productivity

Traumatic Injury to Teeth

Enamel infraction: incomplete fracture of the enamel without loss of tooth substance
Enamel fracture: fracture with loss of enamel only
Enamel–dentine fracture: fracture with loss of enamel and dentine, but not involving the pulp
Complicated crown fracture: fracture involving enamel and dentine, and exposing the pulp
Crown–root fracture: fracture involving enamel, coronal and radicular dentine, and cementum
Root fracture: fracture involving radicular dentine cementum and the pulp

Radiographic Evaluation

Radiographic evaluation of dentoalveolar injuries should include a panoramic radiograph and periapical radiograph of involved teeth
Radiographic examination reveals the stage of root formation and discloses injuries affecting root portion of the tooth and periodontal structures
Multiple periapical radiographs taken at different angles demonstrate root fractures that are minimally displaced
Ideally, three different radiographs from different angles should be obtained for each traumatized tooth

Fractures of the Alveolar Process

Fractures of the alveolar process are found predominantly in the anterior teeth and the premolar region
Injuries may be isolated or may be seen in conjunction with traumatic injuries to teeth
Radiographic Features
- Fracture is readily identified in the intraoral periapical radiograph
- Lateral extraoral radiographs best demonstrate the location of the fracture if some bone displacement has occurred

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Description

This quiz covers craniofacial and skull projections in radiology, including the Submentovertex (SMV) and Waters projections. It focuses on the positioning of the patient and the resulting images of the skull, including the base of the skull, zygomatic arches, and sphenoid sinuses.