Podcast Beta
Questions and Answers
What patient positioning instruction should be given to ensure proper alignment of the teeth with the plastic bite-block?
Which aspect makes panoramic radiographs advantageous over full mouth periapical survey?
What is a limitation of panoramic radiographs mentioned in the text?
What patient positioning instruction is crucial when taking panoramic radiographs?
Signup and view all the answers
Why are fast films and intensifying screens considered limitations of panoramic radiographs?
Signup and view all the answers
Which advantage of panoramic radiographs makes them useful for patients with trismus?
Signup and view all the answers
What is a common drawback mentioned regarding the use of panoramic radiographs?
Signup and view all the answers
Which is NOT a reason for preferring periapical and bitewing radiographs over panoramic radiographs?
Signup and view all the answers
What makes panoramic radiographs preferable over full mouth periapical survey according to the text?
Signup and view all the answers
Which aspect of panoramic radiographs can pose challenges even with proper technique?
Signup and view all the answers
Study Notes
Panoramic Radiographic Imaging
- Panoramic radiography is a technique that produces a single tomographic image of facial structures, including both maxillary and mandibular arches and their supporting structures.
Principles of Panoramic Radiography
- Scanography: uses a thin moving narrow beam of x-ray to scan a selected part of the object.
- Tomography: allows imaging of one chosen layer or section of the body while blurring images from structures in other planes.
Focal Trough
- A 3D curved zone where the dental arches should be placed, in which structures are clearly demonstrated on a panoramic image.
Indications of Panoramic Radiography
- Assessment of multiple impacted teeth
- Assessment of both jaws before implant placement or planning for dentures
- Demonstrating fractures of the mandible
- Demonstrating pathological lesions as cysts or tumors affecting both jaws
- Demonstrating moderate or periodontal disease in an overall view
- Demonstrating an anterior view of the sinuses and the floor of the nasal cavity
- Orthodontic assessment and evaluation of the eruption patterns, growth, and development of both dentitions
Components of Panoramic Units
- X-ray tube head and slit collimator
- Cassette and cassette-carriage assembly
- Head-positioning apparatus
- Control Panel with exposure controls
- Standing or sitting patient position
Panoramic Technique
- Patient Preparation: explain the procedure, remove metallic objects, and wear a lead apron
- Equipment Preparation: load the panoramic cassette, sterilize the bite-block, and set exposure factors
- Patient Positioning: sit/stand with back straight, position the mid-sagittal plane, and instruct the patient to bite on the plastic bite-block
Advantages of Panoramic Radiography
- Allows examination of both jaws in one radiograph
- Procedures are relatively simple to perform and require minimal time
- Requires minimal patient cooperation
- Can be used with trismus patients (unable to open their mouth)
- Delivers radiation dose less than full mouth periapical survey
- Useful in case presentation and patient education
Limitations of Panoramic Radiography
- Lack of details due to the use of intensifying screen and fast films
- Certain amount of magnification and overlapping is present even with proper technique
- Objects of interest located outside the focal trough are not seen
- High cost of the equipment
Preferential Use of Periapical & Bitewing Radiographs
- Over panoramic radiographs for:
- Initial (early) caries
- Initial (early) periodontal disease
- Early periapical lesion
- Endodontic treatment
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of the principles involved in panoramic radiography, a technique used to capture tomographic images of facial structures including the maxillary and mandibular arches. Explore concepts such as scanography and tomography.
