Das 135: Intraoral And Extraoral Imaging(Chpt.39,40,41,42)
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A patient must remove earrings and eye glasses prior to having a panoramic radiograph taken.
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True
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False
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DAS 135 focuses on intraoral and extraoral imaging techniques, assessing knowledge on film types, radiographic methods, and safety protocols. It's vital for dental assistants mastering diagnostic imaging skills.
Quiz Preview
- 2.
A panoramic radiograph will allow the dentist to view the entire dentition and related structures on one film.
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True
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False
Correct Answer
A. TrueExplanation
A panoramic radiograph is a type of dental X-ray that captures a wide view of the entire dentition and related structures in a single image. This allows the dentist to assess the overall condition of the teeth, jawbone, and surrounding tissues without the need for multiple X-rays. It provides a comprehensive view and helps in detecting various dental issues such as impacted teeth, cysts, tumors, and bone abnormalities. Therefore, the statement that a panoramic radiograph allows the dentist to view the entire dentition and related structures on one film is true.Rate this question:
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- 3.
Bitewing radiographs are used to show interproximal caries, early periodontal disease, and recurrent decay under restorations.
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True
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False
Correct Answer
A. TrueExplanation
Bitewing radiographs are commonly used in dentistry to detect interproximal caries, which are cavities that form between the teeth. These radiographs are also helpful in identifying early signs of periodontal disease, such as bone loss and changes in the gum tissue. Additionally, bitewing radiographs can reveal recurrent decay that may be occurring underneath dental restorations, such as fillings or crowns. Therefore, it is true that bitewing radiographs are used to show interproximal caries, early periodontal disease, and recurrent decay under restorations.Rate this question:
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- 4.
Number 2 film is commonly used for adult bitewing radiographs.
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True
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False
Correct Answer
A. TrueExplanation
Film number 2 is commonly used for adult bitewing radiographs because it provides a higher resolution and better image quality compared to other film sizes. This film size is ideal for capturing detailed images of the posterior teeth and detecting any signs of decay or dental problems. Using film number 2 ensures that the dentist can accurately diagnose and treat any dental issues in adult patients.Rate this question:
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- 5.
A periapical radiograph pictures the entire tooth and surrounding areas.
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True
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False
Correct Answer
A. TrueExplanation
A periapical radiograph is a type of dental X-ray that captures an image of the entire tooth, including the root and surrounding structures such as the bone and tissues. This type of radiograph is commonly used to diagnose and monitor dental conditions such as tooth decay, infections, and abnormalities. Therefore, the statement that a periapical radiograph pictures the entire tooth and surrounding areas is true.Rate this question:
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- 6.
Factors that can affect the quality of dental radiographs include:
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Film sensor placement.
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Exposure.
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Processing.
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All the above.
Correct Answer
A. All the above.Explanation
The quality of dental radiographs can be affected by various factors including film sensor placement, exposure, and processing. Proper placement of the film sensor is crucial for obtaining clear and accurate images. Exposure refers to the amount of radiation used, which can impact the clarity and detail of the radiograph. Additionally, the processing of the radiograph plays a significant role in determining its quality. Therefore, all of the mentioned factors can affect the quality of dental radiographs.Rate this question:
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- 7.
If the patient is in a wheelchair, doesn’t have use of his or her upper limbs, and a film sensor holder cannot be used to stabilize the film sensor, you should do which of the following?
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You may ask the patient's caregiver to assist in holding the film sensor.
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Hold the film sensor in the patient's mouth while you press the exposure button.
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Hold the film sensor in the patient's mouth and ask the caregiver to press the exposure button.
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Turn the wheelchair on its side until gravity holds the film sensor in the proper position.
Correct Answer
A. You may ask the patient's caregiver to assist in holding the film sensor.Explanation
If the patient is in a wheelchair, unable to use their upper limbs, and a film sensor holder cannot be used, the best option is to ask the patient's caregiver to assist in holding the film sensor. This ensures that the film sensor remains stable during the procedure and allows for accurate imaging. Holding the film sensor in the patient's mouth while pressing the exposure button or asking the caregiver to press the exposure button can lead to incorrect positioning and potential harm to the patient. Turning the wheelchair on its side is not a viable option as it can cause injury to the patient and disrupt the procedure.Rate this question:
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- 8.
Radiographs on edentulous patients are not necessary.
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True
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False
Correct Answer
A. FalseExplanation
THEY ARE necessary, the doctor needs to see if there are any retained root tips.Rate this question:
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- 9.
The _____ technique is recommended by the American Academy of Oral and Maxillofacial Radiology and the American Association of Dental Schools, because it provides the most accurate image with the least amount of radiation exposure to the patient.
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Bisecting-angle
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Paralleling
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Bitewing survey
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Short-cone
Correct Answer
A. ParallelingExplanation
The paralleling technique is recommended by the American Academy of Oral and Maxillofacial Radiology and the American Association of Dental Schools because it provides the most accurate image with the least amount of radiation exposure to the patient. This technique involves placing the film parallel to the long axis of the tooth and using a beam alignment device to ensure proper angulation. This results in a more accurate representation of the tooth and surrounding structures, while minimizing radiation exposure.Rate this question:
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- 10.
An intraoral full-mouth survey (FMX) on an adult consists of _____ images.
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18 to 20.
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4.
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10 periapical images and 2 bitewing.
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4 anterior images and 8 posterior.
Correct Answer
A. 18 to 20.Explanation
An intraoral full-mouth survey (FMX) on an adult typically consists of 18 to 20 images. This includes 10 periapical images and 2 bitewing images, as well as 4 anterior images and 8 posterior images.Rate this question:
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- 11.
The CBCT is useful in helping the dentist:
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Decide the correct placement of implants.
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With extractions of impacted teeth.
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Determine the exact location of the mandibular nerve before surgery.
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All of the above.
Correct Answer
A. All of the above.Explanation
The correct answer is "all of the above." CBCT (Cone Beam Computed Tomography) is a useful tool for dentists in various procedures. It helps in deciding the correct placement of implants by providing a 3D image of the patient's jawbone, allowing the dentist to accurately plan the implant placement. CBCT also aids in extractions of impacted teeth by providing detailed information about the position and orientation of the impacted tooth. Additionally, it helps determine the exact location of the mandibular nerve before surgery, reducing the risk of nerve damage. Therefore, all of the given options are correct uses of CBCT in dentistry.Rate this question:
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- 12.
Which teeth are included in the anterior set of images?
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Premolars and molars
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Canines and incisors
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Canines and premolars
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Incisors and molars
Correct Answer
A. Canines and incisorsExplanation
The anterior set of teeth refers to the front teeth in the mouth. These include the incisors and canines. The premolars and molars are located towards the back of the mouth and are not part of the anterior set of teeth. Therefore, the correct answer is canines and incisors.Rate this question:
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- 13.
Occlusal radiographs are used to locate retained roots, supernumerary teeth, salivary stones, and fractures.
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True
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False
Correct Answer
A. TrueExplanation
Occlusal radiographs are a type of dental X-ray that provide a comprehensive view of the upper and lower jaw. They are commonly used to identify various dental conditions such as retained roots, supernumerary teeth (extra teeth), salivary stones, and fractures. These radiographs help dentists in diagnosing and planning appropriate treatment for these conditions. Therefore, the statement that occlusal radiographs are used to locate retained roots, supernumerary teeth, salivary stones, and fractures is true.Rate this question:
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- 14.
Periapical x-rays are essential in which dental specialty?
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Pediatric dentistry
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Endodontics
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Oral surgery
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Both b and c
Correct Answer
A. Both b and cExplanation
Periapical x-rays are essential in both endodontics and oral surgery. In endodontics, these x-rays are used to diagnose and treat issues related to the dental pulp and root canal system. They help in identifying infections, abscesses, and other abnormalities. In oral surgery, periapical x-rays are used to evaluate the condition of the teeth and surrounding structures before performing surgical procedures such as extractions or dental implants. Therefore, both endodontics and oral surgery rely on periapical x-rays for accurate diagnosis and treatment planning.Rate this question:
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- 15.
When mounting x-rays, it is important to:
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Know the anatomy of the maxilla and mandible.
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Mount the films in the order of the teeth.
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Label the mount with the patient's name and date before mounting the films.
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All of the above.
Correct Answer
A. All of the above.Explanation
When mounting x-rays, it is important to know the anatomy of the maxilla and mandible because it helps in correctly positioning and interpreting the x-rays. Mounting the films in the order of the teeth is important for proper organization and easy reference. Labeling the mount with the patient's name and date before mounting the films is crucial for identification and record-keeping purposes. Therefore, all of the above options are important when mounting x-rays.Rate this question:
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- 16.
Radiographic images on an edentulous patient might be required for:
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Detection of interproximal caries.
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Identifying objects embedded in the bone.
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Detecting retained root tips, impacted teeth, and lesions.
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Both b and c.
Correct Answer
A. Both b and c.Explanation
Radiographic images on an edentulous patient might be required for identifying objects embedded in the bone, such as foreign bodies or implants, as well as detecting retained root tips, impacted teeth, and lesions. These images can provide valuable information about the condition of the bone and surrounding structures, helping in the diagnosis and treatment planning for the patient.Rate this question:
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- 17.
Which of these is not an intraoral view?
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Interproximal
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Occlusal
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Panoramic
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Periapical
Correct Answer
A. PanoramicExplanation
A panoramic view is not an intraoral view because it is taken outside of the mouth and captures a wide-angle image of the entire oral cavity, including the teeth, jaws, and surrounding structures. In contrast, intraoral views such as interproximal, occlusal, and periapical views are taken from inside the mouth and focus on specific areas or individual teeth.Rate this question:
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- 18.
Which of the following are advantages of using a long position indicator device (PID)?
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Enable the x-ray photons to emerge in a straighter line
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Aids in producing a more accurate image
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Reduces the magnification of the image
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Improves sharpness of the image
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All of the above
Correct Answer
A. All of the aboveExplanation
A long position indicator device (PID) has several advantages. Firstly, it enables the x-ray photons to emerge in a straighter line, which helps in reducing scatter and improving image quality. Secondly, it aids in producing a more accurate image by providing a consistent and precise positioning of the x-ray tube. Thirdly, it reduces the magnification of the image, allowing for a more accurate representation of the anatomical structures. Lastly, it improves the sharpness of the image by minimizing blurring caused by motion or improper positioning. Therefore, all of the given options are advantages of using a long PID.Rate this question:
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- 19.
The bitewing view is used for detecting:
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Abscessed teeth.
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Periodontal disease
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Interproximal decay.
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Both b and c.
Correct Answer
A. Both b and c.Explanation
The bitewing view is a type of dental X-ray that is commonly used to detect both periodontal disease and interproximal decay. Periodontal disease refers to infections and inflammation of the gums and supporting structures of the teeth, while interproximal decay refers to cavities that form between the teeth. By using the bitewing view, dentists can get a clear image of these areas and identify any issues or abnormalities. Therefore, the correct answer is both b and c.Rate this question:
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- 20.
A ghost image will appear _____ than normal and on the _____ side of the image.
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Larger; opposite
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Larger; same
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Smaller; opposite
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Smaller; same
Correct Answer
A. Larger; oppositeExplanation
When a ghost image appears, it is usually larger in size compared to the normal image. Additionally, the ghost image appears on the opposite side of the original image.Rate this question:
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- 21.
When choosing the time for radiographic exposure, which of the following should be taken into consideration?
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Receptor speed
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Projection being taken
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Patient size and stature
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Child or adult patient
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All of the above
Correct Answer
A. All of the aboveExplanation
When choosing the time for radiographic exposure, all of the above factors should be taken into consideration. The receptor speed refers to the sensitivity of the imaging device and affects the exposure time needed. The projection being taken determines the specific positioning and technique required, which can influence the exposure time. Patient size and stature can affect the positioning and technique used, as well as the exposure time needed. Lastly, whether the patient is a child or an adult can also impact the positioning, technique, and exposure time required. Therefore, all of these factors should be considered when determining the time for radiographic exposure.Rate this question:
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- 22.
The ______ used in the panoramic x-ray machine tubehead is a lead plate with an opening shaped like a narrow vertical slit.
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Filter
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Collimator
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Patient chair
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Bite block
Correct Answer
A. CollimatorExplanation
A collimator is used in the panoramic x-ray machine tubehead to shape the x-ray beam into a narrow vertical slit. This helps to limit the radiation exposure to the patient and ensure that only the necessary area is being imaged. The lead plate with the opening shaped like a narrow vertical slit acts as a barrier that restricts the x-ray beam to a specific shape and direction. This allows for more precise and focused imaging, improving the quality and accuracy of the panoramic x-ray.Rate this question:
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- 23.
Each panoramic unit has a(n) ______ that is used to align the patient’s teeth as accurately as possible.
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Head positioner
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Tubehead
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Exposure control
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Power source
Correct Answer
A. Head positionerExplanation
A head positioner is used in panoramic units to align the patient's teeth as accurately as possible. This device helps to position the patient's head in the correct position, ensuring that the images taken are clear and accurate. By using a head positioner, the dental professional can ensure that the patient's teeth are properly aligned and positioned for the best possible outcome. The head positioner is an essential tool in panoramic imaging, allowing for precise and accurate dental assessments.Rate this question:
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- 24.
The bitewing view shows the:
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Crowns and interproximal areas of the maxillary and mandibular teeth.
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Whole tooth crown to apex and surrounding bone.
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Crestal bone
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Both A and C
Correct Answer
A. Both A and CExplanation
The bitewing view is a type of dental X-ray that provides a detailed image of the crowns and interproximal areas (the areas between the teeth) of both the maxillary (upper) and mandibular (lower) teeth. Additionally, it also shows the crestal bone, which is the bone that surrounds and supports the teeth. Therefore, the correct answer is "both A and C" as the bitewing view captures both the crowns and interproximal areas of the teeth as well as the crestal bone.Rate this question:
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- 25.
It is acceptable for the dental assistant to hold a film in the patient's mouth if they are unable to do so.
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True
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False
Correct Answer
A. FalseExplanation
It is not acceptable for a dental assistant to hold a film in the patient's mouth if they are unable to do so. This task should only be performed by the patient themselves or the dentist. Allowing a dental assistant to hold the film in the patient's mouth can increase the risk of injury or discomfort for the patient. It is important for the patient to be able to hold the film securely and comfortably in order to obtain accurate dental X-rays.Rate this question:
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- 26.
Horizontal angulation is:
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The side-to-side angulation.
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Different when using the paralleling and bisecting techniques.
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Correct when the central ray is parallel to the curvature of the arch.
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Determined by the Stabe bite-block.
Correct Answer
A. The side-to-side angulation.Explanation
Horizontal angulation refers to the side-to-side angulation of the x-ray beam when taking dental radiographs. It is an important factor in obtaining accurate and diagnostic images. The correct horizontal angulation ensures that the structures of interest are properly visualized and avoids distortion or overlap. It is different when using the paralleling and bisecting techniques because the positioning and angulation of the x-ray tube and film/sensor vary between these techniques. The central ray being parallel to the curvature of the arch is not necessarily correct as it depends on the specific tooth or area being imaged. The Stabe bite-block does not determine horizontal angulation but is used to stabilize the film/sensor during exposure.Rate this question:
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- 27.
Incorrect vertical angulation can result in an image that is:
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Elongated
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Foreshortened
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Overlapped
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Either A or B
Correct Answer
A. Either A or BExplanation
Incorrect vertical angulation can result in an image that is either elongated or foreshortened. Elongation occurs when the vertical angulation is too steep, causing the image to appear stretched vertically. Foreshortening, on the other hand, happens when the vertical angulation is too shallow, causing the image to appear compressed vertically. Therefore, both options A and B are possible outcomes of incorrect vertical angulation.Rate this question:
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- 28.
The number of x-ray views that makes a patient's full-mouth series depends on:
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The dentist's preference.
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The number of teeth present in a patients mouth.
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Whether the paralleling or the bisecting technique is used.
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All of the above.
Correct Answer
A. All of the above.Explanation
The correct answer is "all of the above" because the number of x-ray views required for a patient's full-mouth series can vary depending on the dentist's preference, the number of teeth present in the patient's mouth, and the technique used (paralleling or bisecting). Each dentist may have their own preference for the number of views they want to take, and this can also be influenced by the specific needs of the patient. Additionally, the technique used can affect the number of views required as different techniques may capture different areas of the mouth.Rate this question:
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- 29.
The quality of the panoramic view depends on:
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How the patient's jaw is positioned within the focal trough.
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The size of the patient's jaw.
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How closely the patient's jaw conforms to the focal trough.
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All of the above.
Correct Answer
A. All of the above.Explanation
The quality of the panoramic view depends on multiple factors. Firstly, it depends on how the patient's jaw is positioned within the focal trough. If the jaw is not properly positioned, it can result in distorted or unclear images. Secondly, the size of the patient's jaw also plays a role. A larger jaw may require adjustments in positioning to capture the entire area of interest. Lastly, how closely the patient's jaw conforms to the focal trough is important. If the jaw is not aligned properly, it can lead to overlapping or blurred images. Therefore, all of these factors contribute to the quality of the panoramic view.Rate this question:
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- 30.
What is the approximate vertical angulation for most bitewing radiographic procedures?
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-10 degrees
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0 degrees
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+10 degrees
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+20 degrees
Correct Answer
A. +10 degreesExplanation
The approximate vertical angulation for most bitewing radiographic procedures is +10 degrees. This angulation helps to capture the interproximal areas of the teeth and detect any signs of decay or bone loss. It allows for a clear view of the crowns and the interproximal spaces, ensuring accurate diagnosis and treatment planning.Rate this question:
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- 31.
If the central ray of the x-ray beam is not centered on the film sensor, a parital image will result on the film sensor, which is called a:
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Cone cut.
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Herringbone image.
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Blurred image.
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Elongated image.
Correct Answer
A. Cone cut.Explanation
If the central ray of the x-ray beam is not centered on the film sensor, it will result in a partial image on the film sensor. This phenomenon is known as a "cone cut." A cone cut occurs when the x-ray beam does not align properly with the film, causing a portion of the image to be cut off or missing. This can happen if the x-ray machine is not properly calibrated or if the patient is not positioned correctly. Cone cuts can lead to inaccurate or incomplete diagnostic information, so it is important to ensure proper alignment of the x-ray beam with the film sensor.Rate this question:
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- 32.
Advantages of panaramic imaging include which of the following?
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The entire maxilla and mandible are seen on one image
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It is easy and quick to learn how to expose a panoramic image.
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Patients prefer panoramic images and are exposed to less radiation.
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All of the above are advantages of panoramic imaging.
Correct Answer
A. All of the above are advantages of panoramic imaging.Explanation
Panoramic imaging offers several advantages. Firstly, it allows the entire maxilla and mandible to be seen on one image, providing a comprehensive view of the dental structures. Additionally, panoramic imaging is easy and quick to learn, making it a convenient option for dental professionals. Moreover, patients prefer panoramic images as they offer a less invasive and more comfortable experience. Lastly, panoramic imaging exposes patients to less radiation compared to other imaging techniques. Therefore, all of the given statements are valid advantages of panoramic imaging.Rate this question:
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- 33.
The focal trough is an imaginary three-dimensional curved area or space, shaped like a:
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Gutter.
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Bowling pin.
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Horseshoe
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Baseball diamond.
Correct Answer
A. HorseshoeExplanation
The focal trough is an imaginary three-dimensional curved area or space that is shaped like a horseshoe. This shape is used in dental radiography to ensure that all structures within the patient's mouth are in focus. The horseshoe shape allows for a wider range of focal distances, accommodating different sizes and shapes of patients' mouths. This ensures that the resulting radiographs are clear and accurate, providing valuable information for diagnosis and treatment planning.Rate this question:
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- 34.
The exposure sequence for the posterior teeth should begin with the _____ view.
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Maxillary right premolar
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Maxillary right molar
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Mandibular right premolar
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Mandibular right molar
Correct Answer
A. Maxillary right premolarExplanation
The exposure sequence for the posterior teeth should begin with the maxillary right premolar view. This is because the maxillary right premolar is located towards the front of the mouth and is easier to access compared to the other options. Starting with this view allows for a systematic approach to capturing images of the posterior teeth, moving from front to back.Rate this question:
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- 35.
The skill view that shows the bones of the face and skull and the soft tissue profile is the ____ projection.
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Lateral cephalometric
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Posteroanterior
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Magnetic resonance
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Temporomandibular
Correct Answer
A. Lateral cephalometricExplanation
The correct answer is lateral cephalometric. This view is used in orthodontics and oral and maxillofacial surgery to evaluate the position of the bones of the face and skull, as well as the soft tissue profile. It provides a side view of the head, allowing for the analysis of facial proportions and the assessment of skeletal relationships. This projection is commonly used to diagnose and plan treatment for craniofacial abnormalities and orthodontic issues.Rate this question:
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- 36.
A panoramic radiograph does not need any specialized equipment.
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True
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False
Correct Answer
A. FalseExplanation
A panoramic radiograph does require specialized equipment. This type of X-ray imaging technique captures a wide view of the entire mouth, including the teeth, jawbones, and surrounding structures. To obtain a panoramic radiograph, a patient must stand or sit in a specific position while the X-ray machine rotates around their head. This specialized equipment is necessary to capture the comprehensive image and provide valuable information for dental diagnoses and treatment planning.Rate this question:
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- 37.
Computed tomography:
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Is used in dentistry primarily for diagnosing of lesions and planning implant cases.
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Uses a magnetic field, thereby not exposing the patient to x-radiation.
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Has long been used in dental radiology and the scanners are common in dental offices.
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Requires the use of film and processing.
Correct Answer
A. Is used in dentistry primarily for diagnosing of lesions and planning implant cases.Explanation
Computed tomography is a valuable tool in dentistry for diagnosing lesions and planning implant cases. It provides detailed images of the oral and maxillofacial region, allowing dentists to accurately assess the extent of a lesion or determine the optimal placement of dental implants. Unlike traditional x-rays, which use ionizing radiation, CT scans use a series of x-ray beams and a computer to create cross-sectional images. This reduces the patient's exposure to radiation while still providing high-quality diagnostic information. CT scanners have been widely adopted in dental offices for their effectiveness in improving patient care and treatment outcomes.Rate this question:
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- 38.
Which statement is true of a grid?
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The grid is placed between the patient's head and the film.
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A grid allows passage of the x-ray beam.
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Scatter radiation is absorbed by the lead strips on the grid, reducing film fog.
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All of the above are true.
Correct Answer
A. All of the above are true.Explanation
A grid is a device that is placed between the patient's head and the film during an x-ray procedure. It is designed to allow passage of the x-ray beam while absorbing scatter radiation. The lead strips on the grid help to reduce film fog caused by scatter radiation. Therefore, all of the given statements about a grid are true.Rate this question:
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- 39.
When taking premolar bitewing image, the anterior edge of the film sensor should be placed:
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In the middle of the first premolar
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On the distal half of the canine
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On the distal half of the lateral incisor
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On the mesial of the second premolar
Correct Answer
A. On the distal half of the canineExplanation
The correct answer is "on the distal half of the canine." When taking a premolar bitewing image, the anterior edge of the film sensor should be placed on the distal half of the canine. This positioning allows for proper visualization of the premolar region and ensures that the image captures the necessary information. Placing the film sensor in any other position may result in inadequate or inaccurate imaging of the desired area.Rate this question:
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- 40.
If the patient’s chin is positioned too low during the panoramic exposure:
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The mandibular incisors will appear blurred.
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The condyles will not be visible.
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Detail in the posterior apical regions will be lost.
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Both a and b.
Correct Answer
A. Both a and b.Explanation
If the patient's chin is positioned too low during the panoramic exposure, both the mandibular incisors appearing blurred and the condyles not being visible can occur. This is because the incorrect positioning of the chin can affect the alignment of the teeth and the visibility of the condyles in the image.Rate this question:
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- 41.
The cause of a panoramic image that comes out with a radiopaque cone-shaped artifact that interferes with the diagnostic information is the:
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Patient's chin was too high during the procedure.
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Patient's lead apron was incorrectly placed or a lead apron with a thyroid collar was used.
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Patient's head was posterior to the focal trough.
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Patient moved during the procedure.
Correct Answer
A. Patient's lead apron was incorrectly placed or a lead apron with a thyroid collar was used.Explanation
The panoramic image may have a radiopaque cone-shaped artifact that interferes with the diagnostic information if the patient's lead apron was incorrectly placed or a lead apron with a thyroid collar was used. This is because the lead apron or thyroid collar can block or scatter the X-ray beam, resulting in the artifact on the image.Rate this question:
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- 42.
The exposure controls allow the _____ to be adjusted on the panoramic x-ray unit, to accommodate patients of different sizes.
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Exposure time
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Vertical angulation
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Horizontal angulation
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Milliamperage and kilovoltage
Correct Answer
A. Milliamperage and kilovoltageExplanation
The exposure controls on a panoramic x-ray unit allow the milliamperage and kilovoltage to be adjusted. This is necessary to accommodate patients of different sizes because different patients may require different levels of radiation exposure. By adjusting the milliamperage and kilovoltage, the operator can control the intensity and quality of the x-ray beam, ensuring that each patient receives the appropriate amount of radiation for their specific needs.Rate this question:
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- 43.
The part of the unit that aligns the patients teeth as accurately as possible is the:
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Head positioner.
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Focal trough
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Frankfort plane
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Tubehead
Correct Answer
A. Head positioner.Explanation
The head positioner is the part of the unit that aligns the patient's teeth as accurately as possible. It helps to position the patient's head in the correct position for dental procedures, ensuring that the teeth are properly aligned for treatment. The focal trough refers to the area where the X-ray images are focused, the Frankfort plane is a reference line used to position the patient's head, and the tubehead is the part of the unit that produces the X-ray beam. However, none of these directly align the patient's teeth like the head positioner does.Rate this question:
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- 44.
According to the guidelines for film placement, which of the following is true?
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The colored side of the film always faces the teeth.
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Anterior films are always placed horizontally.
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Posterior periapical films are always placed vertically.
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The identification dot on the film is always placed in the slot of the film holder.
Correct Answer
A. The identification dot on the film is always placed in the slot of the film holder.Explanation
The correct answer is that the identification dot on the film is always placed in the slot of the film holder. This is because the identification dot helps to determine the orientation of the radiograph and ensure that it is correctly positioned. Placing the dot in the slot of the film holder allows for consistent and accurate placement of the film during dental imaging procedures.Rate this question:
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- 45.
Incorrect horizontal angulation of the PID results in:
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Elongation.
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Foreshortening.
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Blurred images.
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Overlapped contact areas.
Correct Answer
A. Overlapped contact areas.Explanation
Incorrect horizontal angulation of the PID (Position-Indicating Device) refers to the misalignment of the X-ray beam in relation to the teeth being imaged. This misalignment causes the contact areas between adjacent teeth to overlap in the resulting image. Overlapped contact areas can make it difficult to accurately assess the condition of individual teeth and identify any potential issues, such as cavities or dental decay, in those areas. Therefore, the correct answer is overlapped contact areas.Rate this question:
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- 46.
When taking periapical images, it is best to start with anterior images because:
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They are easier on the operator to take.
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Patients are less likely to gag with anterior film sensor placement.
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Patients can tolerate the film sensor size easier.
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Both b and c.
Correct Answer
A. Both b and c.Explanation
When taking periapical images, it is best to start with anterior images because patients are less likely to gag with anterior film sensor placement and they can tolerate the film sensor size easier.Rate this question:
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- 47.
The major difference between the paralleling technique and the bisecting technique is film sensor:
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Placement
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Speed
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Size
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None of the above
Correct Answer
A. PlacementExplanation
The major difference between the paralleling technique and the bisecting technique is the placement of the film sensor. In the paralleling technique, the film sensor is placed parallel to the long axis of the tooth, while in the bisecting technique, the film sensor is placed at an angle bisecting the angle formed by the tooth and the film.Rate this question:
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- 48.
Vertical angulation:
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Differs according to the techinque being used.
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Refers to the up and down plane.
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Can be determined in degrees marked on the outside of the tubehead.
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All of the above.
Correct Answer
A. All of the above.Explanation
The correct answer is "all of the above" because vertical angulation can indeed differ according to the technique being used, it refers to the up and down plane, and it can be determined in degrees marked on the outside of the tubehead. So, all of these statements are true and contribute to the explanation of the correct answer.Rate this question:
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- 49.
The bisecting technique is preferred because it provides a more accurate image of the teeth.
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True
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False
Correct Answer
A. FalseExplanation
The paralleling technique is the PREFERRED.Rate this question:
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Mar 21, 2023Quiz Edited by
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Jan 09, 2013Quiz Created by
Maurita