EXERCISES, LESSON 4

INSTRUCTIONS:

Answer the following exercises by marking the lettered response that best answers the question or best completes the incomplete statement or by writing the answer in the space provided.

After you have completed all the exercises, turn to "Solutions to Exercises" at the end of the lesson and check your answers.

1. Most dental radiographs are made on _________________ film, which is made
with the film held in the mouth during exposure.
 
2. The types of intraoral radiographic film are:

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________


3. The occlusal examination is valuable in:

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

4. When preparing for a mandibular exposure using the bisecting technique, the
head position should be such that the occlusal surfaces of the mandibular teeth
will be ___________________________ when the mouth is opened.


5. Two of the most commonly-used techniques in periapical radiography are:

_________________________________________________________________

_________________________________________________________________


6. ____________________________ is the up-and-down movement of the tube
head or x-ray beam when using the bisecting periapical technique.


7. _______________________________ exists if the vertical angulation is larger
than necessary. The image of the teeth appears smaller than normal.


8. _______________ exists if the vertical angulation is less than is necessary. The
image of the teeth appears larger than normal.


9. _______________________ is the side-to-side movement of the tube head or
x-ray beams when using the bisecting periapical technique.


10. Correct horizontal angulation for successful radiographs exists when the central
ray is _________________ to the facial surfaces of the teeth and ____________
to the mesial and distal surfaces.


11. In the _________________________ (long-cone) technique, the film is held
parallel to the long axis of the tooth. The central ray is directed to pass at a
________________________angle to both the tooth and the film.


12. The paralleling (long-cone) periapical technique provides a target-film distance of
approximately _________________ inches, in contrast to 8 inches for the bisecting technique.


13. The instruments used to hold the film parallel to the teeth are:
_________________________________________________________________

_________________________________________________________________

_________________________________________________________________


14. The interproximal or bite-wing film is used to obtain an image of the
____________________________ of the teeth, without the distortion that often
occurs in a periapical examination.


15. At times, more extensive radiographic views of oral tissues are desired than are
obtainable with periapical or bite-wing film. These views are made by using
_________________________ film.


16. In all maxillary occlusal techniques, the patient's head is first adjusted so that the
median plane (sagittal plane) of the face is in a __________________ position
and the occlusal surfaces of the maxillary teeth are in a ______________ plane.


17. Describe the head positioning and direction of the x-rays for the mandibular
occlusal techniques.

_________________________________________________________________
 
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