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Table 4 Accuracy of the methods used for canal length determination through Intraclass Correlation Coefficient calculation and Bland-Altman analysis for natural and artificial posterior teeth

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

Methods for canal length determination ICC (95% CI) Bland-Altman analysis
Mean difference Upper limit Lower limit
Natural posterior teeth (n = 78 canals in 21 teeth)
 Radiographic 0.685
(0.545 to 0.787)
−0.40 2.90 −3.70
 Mini Apex 0.941
(0.907 to 0.962)
0.18 1.54 −1.19
 Root ZX 0.958
(0.935 to 0.973)
0.14 1.33 −1.05
Artificial posterior teeth (n = 63 canals in 21 teeth)
 Radiographic 0.625
(−0.037 to 0.853)
−1.70 1.00 −4.40
 Mini Apex 0.959
(0.914 to 0.978)
0.29 1.45 −0.88
 Root ZX 0.947
(0.855 to 0.975)
0.40 1.64 −0.85
  1. ICC Intraclass correlation coefficients, 95% CI 95% confidence intervals