In vitro comparison of cyclic fatigue resistance of TruNatomy in single and double curvature canals compared with different nickel-titanium rotary instruments

Table 2 Weibull analysis of tested instruments

Groups	Single curvature				Double curvature
	Single curvature				Apical curvature				Coronal curvature
	Weibull modulus (m)	Correlation coefficient (R²)	Characteristic strength (σ₀)	Predicted cycles for 99% survival	Weibull modulus (m)	Correlation coefficient (R²)	Characteristic strength (σ₀)	Predicted cycles for 99% survival	Weibull modulus (m)	Correlation coefficient (R²)	Characteristic strength (σ₀)	Predicted cycles for 99% survival
TRN
20/.04	14.7	0.92	1375	1005	12.8	0.96	644	449	15.2	0.97	755	484
26/.04	11.7	0.84	1293	874	11.8	0.94	556	377	10.3	0.93	630	466
HCM
20/.04	16.6	0.91	1434	1069	12.6	0.98	649	450	13.9	0.96	771	514
25/.04	15.7	0.82	1338	1014	11.9	0.97	566	385	11.3	0.91	642	461
VB
20/.04	14.8	0.93	729	535	9.9	0.94	477	253	10.9	0.97	565	371
25/.04	10.5	0.81	555	359	7.2	0.92	305	192	9.5	0.91	377	232
RC
20/.04	11.1	0.96	245	149	8.9	0.93	131	66	9.9	0.93	149	84
25/.04	9.1	0.93	226	147	6.7	0.91	98	59	7.7	0.88	134	82

ISSN: 1472-6831