Hello,

for my thesis I am comparing 5 dental 3d intraoral scanner with a reference model. The study model is very similar to this study: https://ijcd.quintessenz.de/ijcd_2019_01_s0011.pdf

In this study they are using (P90-P10)/2 in the statistics wich is in my opinion the semiinterquartile range of P90-P10, if I am right.

I made 12 scans for each scanner. That makes 60 scans in total.

For each scan I have around 7000 values.

Now my Question is how do I calculate Precision and Trueness, like it is done in the paper.

The statistic program i am using is SPSS V.26.

Do I need to do additonal 3D measurement, where I compare only the scans of each scanner with each other, to calculate the precision or are the values of the deviation to the reference model enough?

Thank you in Advance.

for my thesis I am comparing 5 dental 3d intraoral scanner with a reference model. The study model is very similar to this study: https://ijcd.quintessenz.de/ijcd_2019_01_s0011.pdf

In this study they are using (P90-P10)/2 in the statistics wich is in my opinion the semiinterquartile range of P90-P10, if I am right.

I made 12 scans for each scanner. That makes 60 scans in total.

For each scan I have around 7000 values.

Now my Question is how do I calculate Precision and Trueness, like it is done in the paper.

The statistic program i am using is SPSS V.26.

Do I need to do additonal 3D measurement, where I compare only the scans of each scanner with each other, to calculate the precision or are the values of the deviation to the reference model enough?

Thank you in Advance.

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