Here are 30 potential viva questions and answers related to dental intraoral periapical radiographs (IOPA):
- Q: What is an Intraoral Periapical Radiograph (IOPA)?
- A: An IOPA is a dental X-ray that shows the entire tooth, from the crown to the apex, and surrounding structures.
- Q: Why are IOPA radiographs necessary in dentistry?
- A: IOPA radiographs help in diagnosing dental caries, periapical infections, periodontal diseases, and assessing the root canal system.
- Q: How does the size of the film affect the image resolution in IOPA?
- A: Smaller film sizes provide higher resolution images due to reduced magnification.
- Q: What is the ideal vertical angulation for taking a maxillary anterior IOPA?
- A: +40 degrees.
- Q: Describe the bisecting angle technique.
- A: The bisecting angle technique involves placing the film along the lingual surface and directing the central X-ray beam perpendicular to the bisector of the angle formed by the long axis of the tooth and the film. Viva Questions and Answers Related to Tooth Extraction in Kids
- Q: How is the paralleling technique different from the bisecting angle technique?
- A: In the paralleling technique, the film and tooth are parallel to each other, resulting in less image distortion compared to the bisecting angle technique.
- Q: What are the common errors associated with the bisecting angle technique?
- A: Foreshortening and Elongation.
- Q: What is a bitewing radiograph, and why is it commonly used?
- A: A bitewing radiograph shows the crowns of both the upper and lower teeth in occlusion and is commonly used to detect interproximal caries.
- Q: How do you set up a patient for a bitewing radiograph?
- A: The film is placed parallel to the occlusal surfaces, and the central X-ray beam is directed perpendicular to the film and teeth.
- Q: What is the purpose of using a lead apron during dental radiography?
- A: To protect the patient from unnecessary radiation exposure to non-targeted areas. viva question and answers in blood pressure while doing tooth extraction
- Q: Explain the concept of radiographic density.
- A: Radiographic density refers to the degree of darkening on a radiograph and is influenced by factors like exposure time and radiation intensity.
- Q: What are the contraindications for taking dental radiographs in pregnant patients?
- A: The use of radiographs in pregnant patients should be minimized, especially during the first trimester, unless essential for diagnosis and treatment.
- Q: How do you distinguish between a periapical cyst and a granuloma on an IOPA?
- A: A periapical cyst typically appears as a well-defined radiolucent lesion, while a granuloma may show less defined borders.
- Q: What is the significance of the lamina dura in IOPA radiographs?
- A: The lamina dura represents the compact bone lining the tooth socket, and its integrity is crucial for assessing periodontal health.
- Q: How can you differentiate between an unerupted tooth and an impacted tooth on an IOPA?
- A: An unerupted tooth is within the normal path of eruption, while an impacted tooth is deviated from its normal eruption path. Viva Question and Answers Related to Complete Dentures
- Q: What are the potential complications of taking radiographs with improper angulation?
- A: Distorted images, overlapping structures, and inaccurate diagnosis.
- Q: Explain the concept of the target-receptor distance in dental radiography.
- A: The distance between the X-ray tube target and the receptor (film or sensor). Increased distance reduces radiation intensity and scatter.
- Q: How do you compensate for the increased object-to-film distance in the paralleling technique?
- A: Use longer exposure times to maintain adequate image density.
- Q: What are the common causes of artifacts in dental radiographs?
- A: Patient movement, processing errors, and foreign objects.
- Q: Describe the appearance of a healthy periapical region on an IOPA.
- A: Well-defined periodontal ligament space, intact lamina dura, and normal trabecular bone pattern. viva question and answers related to anterior and posterior teeth crown cutting
- Q: How do you distinguish between an amalgam tattoo and a periapical radiolucency?
- A: An amalgam tattoo is a benign radiopacity caused by amalgam particles, while a periapical radiolucency may indicate pathology.
- Q: What precautionary measures should be taken for a patient with a gag reflex during radiography?
- A: Use topical anesthetics, distraction techniques, and consider alternative imaging methods if necessary.
- Q: Explain the concept of radiographic contrast.
- A: Radiographic contrast refers to the differences in density between adjacent structures, influencing the visibility of details in the image.
- Q: How does radiation exposure from dental radiographs compare to natural background radiation?
- A: Dental radiographs contribute a small fraction to the natural background radiation received by individuals.
- Q: Why is it important to use a beam alignment device during dental radiography?
- A: To ensure accurate positioning and minimize radiation exposure to surrounding tissues.
- Q: What is the purpose of using a lead thyroid collar during dental radiography?
- A: To protect the thyroid gland from radiation exposure.
- Q: Describe the appearance of a periapical abscess on an IOPA.
- A: A radiolucent area around the apex of the tooth, often associated with loss of lamina dura.
- Q: How do you differentiate between a radicular cyst and a dentigerous cyst on an IOPA?
- A: A radicular cyst is associated with the root of a non-vital tooth, while a dentigerous cyst surrounds the crown of an unerupted tooth.
- Q: Discuss the role of dental radiography in implant planning.
- A: Radiographs help assess bone density, anatomy, and identify potential obstacles for precise implant placement.
- Q: How does the use of digital sensors impact radiation exposure compared to traditional film?
- A: Digital sensors generally require less radiation exposure to produce diagnostic images compared to traditional film. Viva question and answers related to different types of Dental burs
