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Table 2 Inter- and intra-examiner reproducibility for natural and artificial posterior teeth among the methods used for canal length determination through Intraclass Correlation Coefficient calculation

From: Use of artificial primary teeth for endodontic laboratory research: experiments related to canal length determination

Methods for root length determination Intraexaminer reliability Interexaminer reliability
Examiner 1 Examiner 2 1st evaluation 2nd evaluation
ICC (95% CI) ICC (95% CI) ICC (95% CI) ICC (95% CI)
Natural posterior teeth (n = 78 canals in 21 teeth)
 Radiographic 0.980
(0.968 to 0.987)
0.966
(0.947 to 0.978)
0.978
(0.956 to 0.988)
0.982
(0.970 to 0.989)
 Mini Apex 0.984
(0.976 to 0.990)
0.995
(0.991 to 0.997)
0.933
(0.896 to 0.957)
0.936
(0.902 to 0.959)
 Root ZX 0.986
(0.979 to 0.991)
0.992
(0.986 to 0.995)
0.949
(0.921 to 0.967)
0.933
(0.897 to 0.957)
Artificial posterior teeth (n = 63 canals in 21 teeth)
 Radiographic 0.976
(0.960 to 0.985)
0.983
(0.970 to 0.990)
0.912
(0.858 to 0.946)
0.929
(0.885 to 0.956)
 Mini Apex 0.988
(0.981 to 0.993)
0.994
(0.991 to 0.997)
0.971
(0.952 to 0.982)
0.963
(0.939 to 0.977)
 Root ZX 0.993
(0.988 to 0.996)
0.997
(0.994 to 0.998)
0.959
(0.933 to 0.975)
0.959
(0.932 to 0.976)
  1. ICC Intraclass correlation coefficients, 95% CI 95% confidence intervals