Advances in Materials Science and Engineering / 2015 / Article / Tab 2

Research Article

Survival Analysis of Factors Influencing Cyclic Fatigue of Nickel-Titanium Endodontic Instruments

Table 2

Results of the Cox proportional hazard model of the cyclic fatigue lifetime of the instruments. The set of reference categories is 3 mm radius, Wizard Navigator, and red ISO colour.

Estimat. Stand. error valueHazard ratio

5 mm−5.4610.4760.00010.004
Mtwo−3.2120.3940.00010.040
ProTaper5.9010.5660.0001365.291
Revo-S0.5830.2590.02501.791
yellow−1.7000.2070.00010.310

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