ARE DENTAL MEASUREMENTS TAKEN ON PLASTER CASTS COMPARABLE TO THOSE
TAKEN FROM CBCT IMAGES AND LASER SCANNED SURFACES?
Table 1. Intra- and inter-operator repeatability (Bland-Altman analysis).
Intraoperator
Central
incisor
Interoperators
First
First
First First
Canine
premolar molar premolar molar
Hemiarch
Central
incisor
Canine
Vestibulopalatal/
Vestibulolingual
Mesiodistal
First First
First First
premolar molar premolar molar
Vestibulopalatal/
Vestibulolingual
Mesiodistal
Left maxillary
Calliper
Bias 0.07 0.02 0.04 0.01 0.01 0.07 0.03 0.02 0.03 0.03 0.04 0.03
Reproducibility 96 95 95 99 95 97 98 99 97 99 98 95
Bias 0.03 0.13 0.14 0.05 0.00 0.23 0.04 0.06 0.20 0.16 0.16 0.21
Reproducibility 96 95 95 93 94 95 98 94 95 98 94 97
Bias 0.06 0.22 0.21 0.16 0.30 0.30 0.05 0.12 0.19 0.12 0.03 0.34
Reproducibility 91 87 83 87 78 78 91 90 94 80 75 72
Bias 0.02 0.00 0.04 0.06 0.03 0.04 0.05 0.03 0.06 0.05 0.04 0.07
Reproducibility 96 97 98 96 93 95 96 98 97 98 97 94
Bias 0.08 0.28 0.06 0.14 0.02 0.13 0.00 0.26 0.28 0.08 0.25 0.01
Reproducibility 98 88 93 96 90 81 97 94 89 94 94 89
Bias 0.10 0.06 0.04 0.20 0.04 0.21 0.10 0.25 0.24 0.04 0.09 0.10
Reproducibility 87 93 86 89 87 75 72 94 90 94 82 82
Digital
CBCT
Right mandibular
Calliper
Digital
CBCT
Bias values (absolute values) are in mm, reproducibility coefficients are in %
Table 2. Bland-Altman analysis for the three measurement methods.
Central
incisor
Canine
Hemiarch
First
premolar
First
molar
Mesiodistal
First premolar
First molar
Vestibulopalatal/ Vestibulolingual
Left maxillary
Calliper - Digital
Digital – CBCT
Bias 0.00 0.02 -0.02 0.00 0.05 0.04
Reproducibility 100 100 99 100 99 99
Bias 0.05 0.00 -0.08 -0.02 0.02 -0.01
99 99 99 99 98 95
0.06 0.02 -0.10 -0.02 0.07 0.03
99 99 99 99 98 95
0.02 -0.01 0.03 -0.01 0.01 0.04
99 99 99 100 98 98
0.08 0.05 -0.03 -0.03 -0.02 0.02
97 98 98 99 91 97
Bias 0.10 0.04 0.00 -0.04 -0.01 0.06
Reproducibility 97 98 98 99 90 96
Reproducibility
Calliper - CBCT
Bias
Reproducibility
Right mandibular
Calliper - Digital
Bias
Reproducibility
Digital – CBCT
Bias
Reproducibility
Calliper - CBCT
Bias values (absolute values) are in mm, reproducibility coefficients are in %
linear distances (crown dimensions) taken with three
different techniques. Overall, differences among the
measurements were limited, and their reproducibility
very high, ranging between 90 and 100%. Together
with the comparison among methods, we investigated
the variability inherent to each measurement protocol,
namely the effect of repeated measurements made
by the same and different operators. We found limited
40
intra- and inter-operator variabilities. Indeed, the
quantification of inter-operator reliability is necessary
whenever multiple operators contribute to the analysis
of the same dental reproductions. The good agreement
between our two operators may be an effect of their
prior calibration, which should be included in all
measurement protocols [12].
Apparently, this is the first study that reported inter-
Stoma Edu J. 2018;5(1): 38-42
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