Das 135: Intraoral And Extraoral Imaging(Chpt.39,40,41,42)

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Quizzes Created: 3 | Total Attempts: 29,517

Questions: 114 | Attempts: 741 | Updated: Mar 21, 2023

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Questions and Answers

1.

Number 2 film is commonly used for adult bitewing radiographs.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
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.

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2.

Bitewing radiographs are used to show interproximal caries, early periodontal disease, and recurrent decay under restorations.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
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.

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3.

The bisecting technique is preferred because it provides a more accurate image of the teeth.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The paralleling technique is the PREFERRED.

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4.

A periapical radiograph pictures the entire tooth and surrounding areas.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
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.

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5.

Occlusal radiographs are used to locate retained roots, supernumerary teeth, salivary stones, and fractures.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
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.

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6.

It is acceptable for the dental assistant to hold a film in the patient's mouth if they are unable to do so.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
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.

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7.

Radiographs on edentulous patients are not necessary.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
THEY ARE necessary, the doctor needs to see if there are any retained root tips.

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8.

A panoramic radiograph will allow the dentist to view the entire dentition and related structures on one film.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
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.

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9.

A panoramic radiograph does not need any specialized equipment.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
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.

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10.

A patient must remove earrings and eye glasses prior to having a panoramic radiograph taken.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Prior to having a panoramic radiograph taken, it is necessary for a patient to remove earrings and eye glasses. This is because earrings and eye glasses can interfere with the imaging process and may obstruct the clear view of the patient's oral and facial structures that the radiograph aims to capture. By removing these accessories, the radiograph can provide a more accurate and detailed image, allowing for better diagnosis and treatment planning.

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11.

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?
- A.
  
  You may ask the patient's caregiver to assist in holding the film sensor.
- B.
  
  Hold the film sensor in the patient's mouth while you press the exposure button.
- C.
  
  Hold the film sensor in the patient's mouth and ask the caregiver to press the exposure button.
- D.
  
  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.

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12.

According to the guidelines for film placement, which of the following is true?
- A.
  
  The colored side of the film always faces the teeth.
- B.
  
  Anterior films are always placed horizontally.
- C.
  
  Posterior periapical films are always placed vertically.
- D.
  
  The identification dot on the film is always placed in the slot of the film holder.
Correct Answer
D. 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.

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13.

The alignment of the x-ray beam in the horizontal and vertical planes formed by the long axis of the teeth and the film sensor placement is referred to as:
- A.
  
  Angulation.
- B.
  
  Interproximal.
- C.
  
  Paralleling.
- D.
  
  Perpendicular.
Correct Answer
A. Angulation.

Explanation
The correct answer is angulation. Angulation refers to the alignment of the x-ray beam in the horizontal and vertical planes formed by the long axis of the teeth and the film sensor placement. It is important to have proper angulation in order to obtain accurate and clear dental x-ray images.

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14.

The bisecting-angle instrument (BAI) uses _____ to determine the correct PID angulation.
- A.
  
  Indicator arms
- B.
  
  Bite-blocks
- C.
  
  Aiming rings
- D.
  
  Dental dams
Correct Answer
C. Aiming rings

Explanation
The bisecting-angle instrument (BAI) uses aiming rings to determine the correct PID angulation. Aiming rings are commonly used in dental radiography to guide the positioning of the X-ray tube and ensure accurate angulation. By aligning the aiming rings with the desired angle, the dental professional can position the X-ray tube in the correct position to capture clear and accurate images.

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15.

When using an x-ray sensor, it is important to always:
- A.
  
  Place a cotton roll between the sensor and the teeth being x-rayed to protect the sensor.
- B.
  
  Use the bisecting technique.
- C.
  
  Place the sensor parallel to the incisal or occlusal edge of the teeth.
- D.
  
  Make sure the sensor is against the teeth being radiographed.
Correct Answer
C. Place the sensor parallel to the incisal or occlusal edge of the teeth.
16.

In adults, a size #_____ intraoral film is used for the occlusal technique.
- A.
  
  0
- B.
  
  1
- C.
  
  2
- D.
  
  4
Correct Answer
D. 4

Explanation
The correct answer is 4. In adults, a size 4 intraoral film is used for the occlusal technique. The occlusal technique is used to capture images of the entire arch of teeth and surrounding structures in a single film. Size 4 intraoral films are larger in size and can accommodate the entire arch comfortably, making them suitable for this technique in adults.

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17.

Horizontal angulation is:
- A.
  
  The side-to-side angulation.
- B.
  
  Different when using the paralleling and bisecting techniques.
- C.
  
  Correct when the central ray is parallel to the curvature of the arch.
- D.
  
  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.

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18.

Incorrect horizontal angulation of the PID results in:
- A.
  
  Elongation.
- B.
  
  Foreshortening.
- C.
  
  Blurred images.
- D.
  
  Overlapped contact areas.
Correct Answer
D. 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.

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19.

The American Academy of Oral and Maxillofacial Radiology recommends using the paralleling technique because:
- A.
  
  It is an easier technique to use.
- B.
  
  It provides the most accurate image with the least among of radiation exposure.
- C.
  
  The film sensor is placed closer to the teeth therefore reducing the chance of patient gagging.
- D.
  
  Both a and c.
Correct Answer
B. It provides the most accurate image with the least among of radiation exposure.

Explanation
The American Academy of Oral and Maxillofacial Radiology recommends using the paralleling technique because it provides the most accurate image with the least amount of radiation exposure. This technique ensures that the film sensor is positioned parallel to the teeth, resulting in a highly accurate image. Additionally, by using this technique, the film sensor is placed closer to the teeth, reducing the chance of patient gagging. Therefore, both factors contribute to the recommendation of the paralleling technique for its accuracy and patient comfort while minimizing radiation exposure.

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20.

The exposure sequence for the posterior teeth should begin with the _____ view.
- A.
  
  Maxillary right premolar
- B.
  
  Maxillary right molar
- C.
  
  Mandibular right premolar
- D.
  
  Mandibular right molar
Correct Answer
A. Maxillary right premolar

Explanation
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.

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21.

The number of bitewing films needed is based on the curvature of the arch and the:
- A.
  
  Age of the patient.
- B.
  
  Size of the patient's mouth.
- C.
  
  Number of teeth present in the posterior areas.
- D.
  
  Number of periapical x-rays taken.
Correct Answer
C. Number of teeth present in the posterior areas.

Explanation
The number of bitewing films needed is determined by the number of teeth present in the posterior areas. Bitewing films are used to capture images of the back teeth, specifically the premolars and molars. By assessing the number of teeth in these areas, the dentist can determine how many bitewing films are necessary to accurately diagnose and monitor dental conditions such as cavities or gum disease. The other factors mentioned, such as the age of the patient, size of the patient's mouth, and number of periapical x-rays taken, may influence the overall treatment plan but are not directly related to the number of bitewing films needed.

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22.

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.
- A.
  
  Bisecting-angle
- B.
  
  Paralleling
- C.
  
  Bitewing survey
- D.
  
  Short-cone
Correct Answer
B. Paralleling

Explanation
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.

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23.

Angulation of the PID is critical to ensure that the central ray is perpendicular to the bisector line in which of the following techniques?
- A.
  
  Long-cone
- B.
  
  Bisecting
- C.
  
  Bitewing
- D.
  
  Both b and c
Correct Answer
D. Both b and c

Explanation
The angulation of the PID (Position-Indicating Device) is critical to ensure that the central ray is perpendicular to the bisector line in both the bisecting technique and the bitewing technique. In the bisecting technique, the PID is angled to achieve the correct alignment between the central ray and the bisector line of the angle formed by the tooth and the film. In the bitewing technique, the PID is also angled to ensure that the central ray is perpendicular to the bisector line of the interproximal spaces being examined.

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24.

When using a #2 film sensor for anterior views using the paralleling technique, there are _____ anterior images.
- A.
  
  Four
- B.
  
  Six
- C.
  
  Seven
- D.
  
  Eight
Correct Answer
B. Six

Explanation
Three for the maxillary arch and three for the mandibular arch.

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25.

When taking periapical x-rays, the patient's head is _____ for maxillary films and _____ for the mandibular arch.
- A.
  
  Tilted back slightly; tilted back slightly
- B.
  
  Tilted back slightly; upright
- C.
  
  Upright; tilted back slightly
- D.
  
  Upright; upright
Correct Answer
C. Upright; tilted back slightly

Explanation
When taking periapical x-rays, the patient's head is positioned upright for maxillary films and tilted back slightly for the mandibular arch. This positioning allows for optimal visualization of the teeth and surrounding structures in each arch.

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26.

The bitewing view shows the:
- A.
  
  The bitewing view shows the:
- B.
  
  Whole tooth crown to apex and surrounding bone.
- C.
  
  Crestal bone.
- D.
  
  Both a and c.
Correct Answer
D. Both a and c.

Explanation
The bitewing view is a dental radiographic technique that shows both the whole tooth crown to apex and the surrounding bone, as well as the crestal bone. This view provides a comprehensive image of the tooth and its surrounding structures, allowing for a thorough evaluation of dental health and any potential issues.

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27.

What size film sensor is used for the anterior region of the mouth?
- A.
  
  #1
- B.
  
  #2
- C.
  
  #3
- D.
  
  Either A or B
Correct Answer
D. Either A or B

Explanation
The question is asking about the size of the film sensor used for the anterior region of the mouth. The answer is either A or B because the size of the film sensor used in dentistry can vary depending on the specific dental procedure being performed.

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28.

Factors that can affect the quality of dental radiographs include:
- A.
  
  Film sensor placement.
- B.
  
  Exposure.
- C.
  
  Processing.
- D.
  
  All the above.
Correct Answer
D. 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.

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29.

Periapical x-rays are essential in which dental specialty?
- A.
  
  Pediatric dentistry
- B.
  
  Endodontics
- C.
  
  Oral surgery
- D.
  
  Both b and c
Correct Answer
D. Both b and c

Explanation
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.

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30.

When using a size #1 film sensor for anterior images using the paralleling technique, _____ maxillary and _____ mandibular images are exposed.
- A.
  
  Five; four
- B.
  
  Six; four
- C.
  
  Four; three
- D.
  
  Three; four
Correct Answer
C. Four; three

Explanation
When using a size #1 film sensor for anterior images using the paralleling technique, four maxillary images and three mandibular images are exposed.

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31.

When taking periapical images, it is best to start with anterior images because:
- A.
  
  They are easier on the operator to take.
- B.
  
  Patients are less likely to gag with anterior film sensor placement.
- C.
  
  Patients can tolerate the film sensor size easier.
- D.
  
  Both b and c.
Correct Answer
D. 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.

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32.

When mounting x-rays, it is important to:
- A.
  
  Know the anatomy of the maxilla and mandible.
- B.
  
  Mount the films in the order of the teeth.
- C.
  
  Label the mount with the patient's name and date before mounting the films.
- D.
  
  All of the above.
Correct Answer
D. 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.

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33.

To correct an elongated image on an x-ray view, the vertical angulation needs to be:
- A.
  
  Increased.
- B.
  
  Decreased.
- C.
  
  Lowered
- D.
  
  Flatened
Correct Answer
A. Increased.

Explanation
To correct an elongated image on an x-ray view, the vertical angulation needs to be increased. This means that the angle between the x-ray beam and the object being imaged needs to be increased. By doing so, the image will appear shorter and more proportionate. Decreasing or lowering the vertical angulation would only exacerbate the elongation, while flattening the angulation would result in a distorted image. Therefore, increasing the vertical angulation is the correct adjustment to correct the elongation.

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34.

The _____ technique may be used in some situations such as a small mouth, shallow palate, or the presence of tori.
- A.
  
  Paralleling
- B.
  
  Bitewing
- C.
  
  Bisecting
- D.
  
  Long-cone
Correct Answer
C. Bisecting

Explanation
The bisecting technique may be used in some situations such as a small mouth, shallow palate, or the presence of tori. This technique involves aligning the film and the long axis of the tooth, and then angling the x-ray beam to bisect the angle formed by the film and the tooth. It is commonly used when it is difficult to place the film parallel to the tooth due to anatomical limitations.

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35.

The number of x-ray views that makes a patient's full-mouth series depends on:
- A.
  
  The dentist's preference.
- B.
  
  The number of teeth present in a patients mouth.
- C.
  
  Whether the paralleling or the bisecting technique is used.
- D.
  
  All of the above.
Correct Answer
D. 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.

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36.

The major difference between the paralleling technique and the bisecting technique is film sensor:
- A.
  
  Placement
- B.
  
  Speed
- C.
  
  Size
- D.
  
  None of the above
Correct Answer
A. Placement

Explanation
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.

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37.

The bitewing view is used for detecting:
- A.
  
  Abscessed teeth.
- B.
  
  Periodontal disease
- C.
  
  Interproximal decay.
- D.
  
  Both b and c.
Correct Answer
D. 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.

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38.

The bisecting technique is used:
- A.
  
  Because it is recommended by the American Academy of Oral and Maxillofacial Radiology.
- B.
  
  Because this technique provides the most accurate image.
- C.
  
  Because it allows the least amount of radiation to be used to produce a quality image.
- D.
  
  When patients have small mouths or low palatal vaults.
Correct Answer
D. When patients have small mouths or low palatal vaults.

Explanation
The bisecting technique is used when patients have small mouths or low palatal vaults. This technique allows for better positioning of the sensor or film in these cases, ensuring that the entire area of interest is captured in the image. It helps to overcome the limitations posed by anatomical variations and provides a clear and accurate image.

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39.

The American Dental Association recommends that films be mounted:
- A.
  
  With the concave portion of the dot facing up.
- B.
  
  According to the labial mounting method.
- C.
  
  As if the viewer is standing on the patient's tongue.
- D.
  
  So the patient's left side is on the viewer's left side.
Correct Answer
B. According to the labial mounting method.

Explanation
The labial mounting method refers to the placement of dental films in the mouth so that the front side of the teeth (labial surface) faces the viewer. This method allows for easier identification and interpretation of dental structures and abnormalities. Mounting films according to the labial mounting method is recommended by the American Dental Association to ensure accurate diagnosis and treatment planning.

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40.

Radiographic images on an edentulous patient might be required for:
- A.
  
  Detection of interproximal caries.
- B.
  
  Identifying objects embedded in the bone.
- C.
  
  Detecting retained root tips, impacted teeth, and lesions.
- D.
  
  Both b and c.
Correct Answer
D. 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.

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41.

In order to minimize image distortion, the:
- A.
  
  Film must be positioned perpendicular to the long axis of the tooth.
- B.
  
  Film must be positioned parallel to the long axis of the tooth.
- C.
  
  Central ray of the x-ray beam must be directed parallel to the film.
- D.
  
  Central ray of the x-ray beam must be directed parallel to the long axis of the tooth.
Correct Answer
B. Film must be positioned parallel to the long axis of the tooth.

Explanation
When taking an X-ray, positioning the film parallel to the long axis of the tooth helps to minimize image distortion. This is because when the film is parallel to the long axis, it aligns with the tooth structure and allows for a more accurate representation of the tooth's shape and size on the X-ray image. If the film is positioned perpendicular to the long axis, it can result in distortion and an inaccurate representation of the tooth. Similarly, the direction of the central ray of the X-ray beam does not affect image distortion, so the other options are incorrect.

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42.

If the size #2 film sensor is being used, the anterior films are in the ______ position and the posterior films/sensors are in the ______ position.
- A.
  
  Horizontal; horizontal
- B.
  
  Vertical; vertical
- C.
  
  Horizontal; vertical
- D.
  
  Vertical; horizontal
Correct Answer
D. Vertical; horizontal

Explanation
When using the size #2 film sensor, the anterior films are positioned vertically and the posterior films/sensors are positioned horizontally.

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43.

For management of the patient with a gag reflex:
- A.
  
  Slide the film sensor along the palate to minimize the possibility of eliciting the gag reflex.
- B.
  
  Position the film sensor slowly.
- C.
  
  If intraoral images are impossible to obtain, you must use extraoral images.
- D.
  
  Radiographic images are not necessary.
Correct Answer
C. If intraoral images are impossible to obtain, you must use extraoral images.

Explanation
The correct answer states that if it is not possible to obtain intraoral images, extraoral images must be used. This means that if the patient cannot tolerate having the film sensor placed in their mouth due to a gag reflex, alternative imaging techniques that do not require placing the sensor in the mouth should be used. This could include using extraoral techniques such as panoramic radiographs or cone beam computed tomography (CBCT) scans to capture images of the patient's oral structures.

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44.

A periapical view shows the tooth from the occlusal surface or incisal edge to the:
- A.
  
  Crest of alveolar bone.
- B.
  
  Furcation
- C.
  
  Apex of the root.
- D.
  
  Bone about 2 to 3 mm beyond the apex.
Correct Answer
D. Bone about 2 to 3 mm beyond the apex.

Explanation
A periapical view is an X-ray that shows the entire tooth, from the occlusal surface or incisal edge to the bone about 2 to 3 mm beyond the apex. This view is used to assess the root and surrounding bone structure for any abnormalities or pathology. It provides a comprehensive image of the tooth and the surrounding bone, allowing for a thorough evaluation of the tooth's health.

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45.

An intraoral full-mouth survey (FMX) on an adult consists of _____ images.
- A.
  
  18 to 20.
- B.
  
  4.
- C.
  
  10 periapical images and 2 bitewing.
- D.
  
  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.

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46.

A ghost image will appear _____ than normal and on the _____ side of the image.
- A.
  
  Larger; opposite
- B.
  
  Larger; same
- C.
  
  Smaller; opposite
- D.
  
  Smaller; same
Correct Answer
A. Larger; opposite

Explanation
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.

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47.

The CBCT is useful in helping the dentist:
- A.
  
  Decide the correct placement of implants.
- B.
  
  With extractions of impacted teeth.
- C.
  
  Determine the exact location of the mandibular nerve before surgery.
- D.
  
  All of the above.
Correct Answer
D. 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.

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48.

The main components of the panoramic unit include ________, and exposure controls.
- A.
  
  X-ray tubehead
- B.
  
  X-ray tubehead, position-indicator device
- C.
  
  X-ray tubehead, head positioner
- D.
  
  Position-indicator device, head positioner
Correct Answer
C. X-ray tubehead, head positioner

Explanation
The main components of the panoramic unit include the x-ray tubehead, which generates the x-rays, and the head positioner, which holds the patient's head in the correct position for imaging. The x-ray tubehead is responsible for producing the x-rays that pass through the patient's head and create the panoramic image. The head positioner ensures that the patient's head is properly aligned and stable during the imaging process.

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49.

The quality of the panoramic view depends on:
- A.
  
  How the patient's jaw is positioned within the focal trough.
- B.
  
  The size of the patient's jaw.
- C.
  
  How closely the patient's jaw conforms to the focal trough.
- D.
  
  All of the above.
Correct Answer
D. 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.

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50.

The ______ used in the panoramic x-ray machine tubehead is a lead plate with an opening shaped like a narrow vertical slit.
- A.
  
  Filter
- B.
  
  Collimator
- C.
  
  Patient chair
- D.
  
  Bite block
Correct Answer
B. Collimator

Explanation
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.

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Current Version
Mar 21, 2023

Quiz Edited by
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Jan 09, 2013

Quiz Created by
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Das 135: Intraoral And Extraoral Imaging(Chpt.39,40,41,42)

Number 2 film is commonly used for adult bitewing radiographs.

Bitewing radiographs are used to show interproximal caries, early periodontal disease, and recurrent decay under restorations.

The bisecting technique is preferred because it provides a more accurate image of the teeth.

A periapical radiograph pictures the entire tooth and surrounding areas.

Occlusal radiographs are used to locate retained roots, supernumerary teeth, salivary stones, and fractures.

It is acceptable for the dental assistant to hold a film in the patient's mouth if they are unable to do so.

Radiographs on edentulous patients are not necessary.

A panoramic radiograph will allow the dentist to view the entire dentition and related structures on one film.

A panoramic radiograph does not need any specialized equipment.

A patient must remove earrings and eye glasses prior to having a panoramic radiograph taken.

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?

According to the guidelines for film placement, which of the following is true?

The alignment of the x-ray beam in the horizontal and vertical planes formed by the long axis of the teeth and the film sensor placement is referred to as:

The bisecting-angle instrument (BAI) uses _____ to determine the correct PID angulation.

When using an x-ray sensor, it is important to always:

In adults, a size #_____ intraoral film is used for the occlusal technique.

Horizontal angulation is:

Incorrect horizontal angulation of the PID results in:

The American Academy of Oral and Maxillofacial Radiology recommends using the paralleling technique because:

The exposure sequence for the posterior teeth should begin with the _____ view.

The number of bitewing films needed is based on the curvature of the arch and the:

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.

Angulation of the PID is critical to ensure that the central ray is perpendicular to the bisector line in which of the following techniques?

When using a #2 film sensor for anterior views using the paralleling technique, there are _____ anterior images.

When taking periapical x-rays, the patient's head is _____ for maxillary films and _____ for the mandibular arch.

The bitewing view shows the:

What size film sensor is used for the anterior region of the mouth?

Factors that can affect the quality of dental radiographs include:

Periapical x-rays are essential in which dental specialty?

When using a size #1 film sensor for anterior images using the paralleling technique, _____ maxillary and _____ mandibular images are exposed.

When taking periapical images, it is best to start with anterior images because:

When mounting x-rays, it is important to:

To correct an elongated image on an x-ray view, the vertical angulation needs to be:

The _____ technique may be used in some situations such as a small mouth, shallow palate, or the presence of tori.

The number of x-ray views that makes a patient's full-mouth series depends on:

The major difference between the paralleling technique and the bisecting technique is film sensor:

The bitewing view is used for detecting:

The bisecting technique is used:

The American Dental Association recommends that films be mounted:

Radiographic images on an edentulous patient might be required for:

In order to minimize image distortion, the:

If the size #2 film sensor is being used, the anterior films are in the ______ position and the posterior films/sensors are in the ______ position.

For management of the patient with a gag reflex:

A periapical view shows the tooth from the occlusal surface or incisal edge to the:

An intraoral full-mouth survey (FMX) on an adult consists of _____ images.

A ghost image will appear _____ than normal and on the _____ side of the image.

The CBCT is useful in helping the dentist:

The main components of the panoramic unit include ________, and exposure controls.

The quality of the panoramic view depends on:

The ______ used in the panoramic x-ray machine tubehead is a lead plate with an opening shaped like a narrow vertical slit.

When taking periapical x-rays, the patient's head is _ for maxillary films and _ for the mandibular arch.

When using a size #1 film sensor for anterior images using the paralleling technique, _ maxillary and _ mandibular images are exposed.

If the size #2 film sensor is being used, the anterior films are in the position and the posterior films/sensors are in the position.

A ghost image will appear _ than normal and on the _ side of the image.