Radiology lecture 04042024
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Questions and Answers

What is the primary limitation of cone beam CT in evaluating per-implantitis?

  • Dental positioning errors
  • Beam hardening artifact
  • Metal artifact (correct)
  • Low resolution

    • What is the most suitable radiographic tool for assessing periodontal bone loss?

  • Titus CT
  • Panoramic radiograph
  • Cone beam CT
  • Bitewing radiograph (correct)

    • Which of the following radiographic techniques is most prone to foreshortening?

  • Titus CT
  • Cone beam CT
  • Bitewing radiograph (correct)
  • Panoramic radiograph

    • What is the primary advantage of using a bitewing radiograph for diagnosing caries?

    <p>High resolution and parallel technique</p> Signup and view all the answers

    What is the Kari's susceptible zone for interproximal caries?

    <p>From the point where the two teeth almost touch to the level of the gum line</p> Signup and view all the answers

    What is a major limitation of cone beam CT in assessing periodontal bone loss?

    <p>Inaccuracy due to beam hardening artifact</p> Signup and view all the answers

    Why may a patient's head position affect the accuracy of a cone beam CT image?

    <p>It can cause the hyoid bone to appear distorted</p> Signup and view all the answers

    What is a limitation of using cone beam CT in implant imaging?

    <p>Limitations due to beam hardening artifact</p> Signup and view all the answers

    What is an advantage of using PA over cone beam CT in dental imaging?

    <p>Reduced beam hardening artifact</p> Signup and view all the answers

    What can be a consequence of having a restoration in the area of interest during a cone beam CT scan?

    <p>Increased beam hardening artifact</p> Signup and view all the answers

    What is a major limitation of intraoral imaging?

    <p>It projects a 3D image onto a 2D image, losing the third dimension</p> Signup and view all the answers

    What can be hidden in intraoral imaging due to overlapping of bony walls?

    <p>Bone defects</p> Signup and view all the answers

    What is a limitation of radiographs in assessing bone destruction?

    <p>It underestimates the lesions</p> Signup and view all the answers

    Why is it difficult to assess periodontal bone loss using intraoral imaging?

    <p>Because of the overlapping of bony walls</p> Signup and view all the answers

    What is not visible on radiographs?

    <p>Soft tissue</p> Signup and view all the answers

    What is the advantage of adjusting the contrast and brightness of a radiograph image?

    <p>To visualize the gum line for carries diagnosis</p> Signup and view all the answers

    What is a limitation of measuring the depth of periodontal pockets?

    <p>The CEJ is not a reliable reference point</p> Signup and view all the answers

    What is the purpose of using the parallel technique in radiography?

    <p>To reduce distortion and minimize metal artifacts</p> Signup and view all the answers

    What can happen when removing a radiograph sensor from the patient's mouth?

    <p>The glue is removed with the sensor</p> Signup and view all the answers

    Why is it challenging to use the parallel technique in certain cases?

    <p>It is hard to minimize distortion in posterior teeth</p> Signup and view all the answers

    What is the primary challenge in subtractive radiography?

    <p>Stabilizing the process to make it repeatable</p> Signup and view all the answers

    What is the limitation of panoramic radiography in dental imaging?

    <p>It is a very sensitive technique that requires expertise</p> Signup and view all the answers

    Why is it difficult to use subtractive radiography in dental imaging?

    <p>Because the process is not repeatable</p> Signup and view all the answers

    What is the advantage of using a sensor or PSP in dental radiography?

    <p>It allows for the stabilization of the process</p> Signup and view all the answers

    What is the primary difference between a dental CT and a PA in dental imaging?

    <p>One depicts the whole mouth in a single image</p> Signup and view all the answers

    What is the reason the patient's medical history was not considered during the FMS examination?

    <p>The healthcare provider didn't ask about it.</p> Signup and view all the answers

    What was the mistake made by the student during the clinical examination?

    <p>The student didn't clinically examine the patient before taking radiographs.</p> Signup and view all the answers

    Why did the instructor question the need for a retake of the radiograph?

    <p>The radiograph wasn't necessary based on the clinical examination.</p> Signup and view all the answers

    What was the problem with the tooth that the student had missed?

    <p>It had a large caries lesion.</p> Signup and view all the answers

    What is the benefit of taking a thorough medical history during an FMS examination?

    <p>It helps identify potential medical contraindications.</p> Signup and view all the answers

    What is the importance of considering a patient's dental history during an FMS examination?

    <p>It helps identify potential dental problems.</p> Signup and view all the answers

    What is the benefit of performing a clinical examination before taking radiographs?

    <p>It helps reduce the number of radiographs needed.</p> Signup and view all the answers

    What is the consequence of not considering a patient's medical history during an FMS examination?

    <p>It may lead to all of the above.</p> Signup and view all the answers

    What can be a consequence of not performing a clinical examination before taking radiographs?

    <p>It may lead to all of the above.</p> Signup and view all the answers

    What is the importance of considering a patient's dental history during an FMS examination?

    <p>It helps identify potential dental problems.</p> Signup and view all the answers

    What can create a dark line that hinders diagnosis in a tooth near the cortical border of the mandible?

    <p>A defect or lesion</p> Signup and view all the answers

    What can cause a bright area and increased contrast in a dental CT image?

    <p>Air and dense tissue adjacent to each other</p> Signup and view all the answers

    What is a crucial factor in diagnosing carries in teeth like seven and ten?

    <p>Knowledge of dental anatomy</p> Signup and view all the answers

    Why is a review of anatomy and basic interpretation essential for new rotations?

    <p>To provide a solid foundation for diagnostic skills</p> Signup and view all the answers

    Study Notes

    Limitations of Intraoral Imaging

    • Intraoral imaging has limitations, including the loss of the third dimension when projecting a 3D image onto a 2D surface, resulting in artifacts like cervical burnout.
    • Bony defects can be hidden by overlapping higher bony walls.
    • Teeth overlapping or in close proximity can make it difficult to distinguish between caries and proximal bone levels.

    Artifacts and Errors

    • Cervical burnout is an artifact that occurs when there is air beside a dense structure, amplifying the contrast.
    • Metal artifacts, especially with implants, can hinder diagnosis.
    • Patient positioning and technique errors can cause distorted images, making it essential to check the patient clinically before taking radiographs.

    Radiographic Examination

    • Bite-wing radiographs are the best tool for diagnosing caries, as they provide the best technique-wise results due to parallel positioning.
    • Panoramic radiographs are a crude tool for evaluating the entire mouth, but they can be affected by metal artifacts and are limited by resolution.
    • Cone beam CT is limited by metal artifacts, especially with implants, and lacks the same resolution as other tools.

    Anatomical Considerations

    • The maxillary sinus position compared to periodontal bone loss, missing teeth, supernumerary teeth, and impacted teeth can be challenging to diagnose.
    • Pediatric lesions and root resorption need to be considered in anatomical evaluations.

    Bone Loss and Destruction

    • Radiographs can underestimate the severity of bone destruction, and clinicians should be aware of this limitation.
    • Bone loss can be difficult to diagnose, especially on the buckle or lingual side of the tooth.
    • Decrease in root density can indicate bone loss.

    Caries Diagnosis

    • Caries can occur on various surfaces, including proximal, occlusal, buccal, and lingual surfaces, as well as in the interproximal area.
    • The Kari's susceptible zone is the area from where the teeth almost touch to the gum line.
    • Rampant caries can affect multiple teeth and surfaces.

    Cone Beam CT Limitations

    • Cone beam CT is limited by metal artifact, especially with implants, making it difficult to diagnose conditions like peri-implantitis.
    • It lacks the same spatial resolution as other tools, making it challenging to diagnose certain conditions.

    Technique Sensitivity

    • Panoramic radiographs are highly technique-sensitive, and patient positioning can lead to distorted images.
    • Failure to place the tongue in the palate or rotating the head can result in incorrect images.

    Important Reminders

    • Clinicians should be aware of dental anomalies, such as hyperplastic pits, and know how to differentiate them from incipient caries.
    • It is essential to know normal anatomy to diagnose conditions accurately.

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