Podcast
Questions and Answers
What patient positioning instruction should be given to ensure proper alignment of the teeth with the plastic bite-block?
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?
Which aspect makes panoramic radiographs advantageous over full mouth periapical survey?
What is a limitation of panoramic radiographs mentioned in the text?
What is a limitation of panoramic radiographs mentioned in the text?
What patient positioning instruction is crucial when taking panoramic radiographs?
What patient positioning instruction is crucial when taking panoramic radiographs?
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Why are fast films and intensifying screens considered limitations of panoramic radiographs?
Why are fast films and intensifying screens considered limitations of panoramic radiographs?
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Which advantage of panoramic radiographs makes them useful for patients with trismus?
Which advantage of panoramic radiographs makes them useful for patients with trismus?
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What is a common drawback mentioned regarding the use of panoramic radiographs?
What is a common drawback mentioned regarding the use of panoramic radiographs?
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Which is NOT a reason for preferring periapical and bitewing radiographs over panoramic radiographs?
Which is NOT a reason for preferring periapical and bitewing radiographs over panoramic radiographs?
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What makes panoramic radiographs preferable over full mouth periapical survey according to the text?
What makes panoramic radiographs preferable over full mouth periapical survey according to the text?
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Which aspect of panoramic radiographs can pose challenges even with proper technique?
Which aspect of panoramic radiographs can pose challenges even with proper technique?
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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
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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.
