Taking the best exposures
Dentists once in a while have problems with making good and significant pictures with the X-ray devices in their practices. So pictures with a noticeable high resolution are not always that easy to get. We want to demonstrate you step by step, how to get the best pictures for adults, adolescents and children with your KaVo Pan eXam!
1. Slide the chin rest on to the support holder.
2. Dentate patients: Attach the bite block to the bite fork and then insert the bite fork and bite block into the hole in the chin rest.
Edentulous patients: Attach the chin support to the chin rest. If the patient is partially eden-tulous attach the edentulous bite positioner to a bite fork and then insert the bite fork and eden-tulous bite positioner into the hole in the chin rest.
3. Place the appropriate disposable covers on to the patient support you are using.
4. Press the program key to select the panoramic program you require, adult (P1), child (P2) or bitewing (BW). The magnification for these programs is 1.25.
5. Use the + / – keys to select the required kV for the patient being examined:
– large adult
The DAP value will appear on the display.
6. Ask the patient to remove any spectacles, dentures, jewellery and hair clips and pins. Place a protective lead apron over the patient’s shoulders.
NOTE: If the patient is nervous, you can reassure them by demonstrating how the unit works before taking the exposure. See section 4. Operating the unit without x-rays.
7. Press the Up/Down keys to adjust the height of the chin rest so it is slightly higher than the patient’s chin so that the patient will have to stretch up to place their chin on the chin rest.
8. If the patient is dentate ask the patient to step into the unit, grasp the patient handles, place his/her chin on the chin rest and bite the notches in the bite block.
If the patient is partially edentoulous ask the patient to bite the edentulous bite positioner.
If the patient is edentulous ask the patient press chin against the chin support.
9. Press the Lights key to switch the patient positioning lights on. They will remain on for two minutes.
NOTE: The patient positioning lights will automatically come on when either the Up or Down key is pressed.
10. Look at the reflection of the patient in the mirror and position the midsagittal plane of the patient so that it coincides with the midsagittal plane light. Make sure that the patient is looking straight ahead and that the patient’s head is not tilted or turned to one side.
11. Press either Up/Down key to adjust the tilt of the patient’s head until the patient’s Frankfort plane coincides with, or is parallel to, the horizontal light.
CAUTION: When pressing the Up/Down keys to adjust the tilt of the patient’s head take care not to cause the patient any distress or discomfort.
12. The focal trough light indicates the center of the focal trough which is 10 mm wide at the front. Ask the patient to open their lips so that you can see the patient’s teeth. For adult (P1) and child (P2) panoramic exposures use the focal trough knob to position the patient so that the focal trought light is in the center of the patient’s upper and lower third teeth (canines). The roots of the upper and lower front incisors must be located within the focal trough and be on the same vertical plane.
If the roots of the upper and lower front incisors are not on the same vertical plane adjust the tilt of the patient’s head until they are.
For bitewing (BW) panoramic exposures position the chinrest on the BW line.
13. Close the temple supports by sliding the temple support knob to the right (A). Make sure that patient’s neck is stretched and straight. Adjust the position of the nasion support (B) and then carefully push the forehead support in until it touches the patient’s nasion (C).
14. Ask the patient to press their lips together and press their tongue against the roof of their mouth. Then ask the patient to look at a fixed point in the mirror and to remain still for the duration of the exposure. The exposure takes approximately ten seconds.
15. Ask the patient to step forward slightly so that they out of balance and “hanging” onto the support handles. This will force the patient to stretch their neck as far a possible. Check that the patient has not moved and is still in the correct position.
16. PC: Enable image capture.
17. Move at least two metres away from the unit and protect yourself from radiation. Make sure that you can see and hear the patient during the exposure.
18. Press and hold down the exposure button for the duration of the exposure. During the exposure you will hear an audible signal and the exposure warning indicator on the control panel will come on.
The rotating unit will rotate around the patient’s head and then stop. When the rotating unit stops, the exposure has been taken.
19. Press the release button at the top of the forehead support (A) and then slide the forehead support away from the patient (B). Open the temple supports by sliding the temple support knob to the left (C). Guide the patient out of the unit.
20. Press the Return key to drive the unit to the PIO position.
NOTE: After the exposure, a timer indicating the tubehead cooling time will appear on the display. A new exposure cannot be taken until the counter reaches zero, the exposure time reappears on the display, and the ready light comes on.
21. PC: After the exposure has been taken a progress bar will appear. This indicates that the image is being transfered to the PC.