Dentsply Sirona
Service Manual CEREC Primescan AC, Primescan AC, CEREC Omnicam AC, Omnicam AC
2 Service tools
2.4 "DrPrimescan" Primescan diagnostics program
66 81 832 D3696
D3696.076.01.02.02 05.2019
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Figure 2: Live image display as issued by DrPrimescan for a camera that is
in good working order.
The final step involves the launch of the acquisition process for 2D live
images and 3D data that are displayed in a joint window, as shown in
Figure 2. This shows the raw data from the 2D sensor (left), while the
raw data from the 3D sensor is displayed in a false color image (right).
Assessment of live images
Further information is provided below on assessing the live images, as
this is not performed automatically. For this step, the camera should be
held on an even surface which is as white as possible. Above all, it
should be a non-reflective surface. The DrPrimescan diagnostics
program cannot set the white balance and the brightness of the images
correctly, and this must be taken into consideration when assessing the
images. Figure 2 shows how the images could look with the two live
images. Here a slight color deviation and the edge of the field of vision
can be identified in the left image, both effects are completely normal in
the raw data of the camera and say nothing about the quality.
Nevertheless, in this step, it is possible and important to verify that both
images are being transmitted smoothly and in real-time. To this end, it is
easy to move the camera a little, ensuring that no delays occur and that
a consistent video stream is always received. Furthermore, it is
important to ensure that any tint which may be present appears to the
same extent in both images.
The frame rate displayed in the live image (approx. 15.5 Hz in the
example in Figure 2) is not the maximum potential frame rate for the
Primescan scanner. The diagnostics program deliberately sets the
camera to an optimal frame rate for the analyses.
If no problems are detected here, the camera should also function
correctly in CEREC. As the CEREC software configures the camera
correctly with regard to white balance, exposure time and live image
section, here it is possible to make a conclusive assessment of the
quality of the live image.
