Phase Transformation Behavior and Resistance to Bending and Cyclic Fatigue of ProTaper Gold and ProTaper Universal Instruments

Hieawy, Ahmed; Haapasalo, Markus; Zhou, Huimin; Wang, Zhe-jun; Shen, Ya

doi:10.1016/j.joen.2015.02.030

Cited by 235 publications

(238 citation statements)

References 28 publications

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“…The patent on ProTaper Universal files recently expired; several other companies now offer their own versions of ProTaper files, including Channels PT tapered files. Due to advances in metallurgy and in the heat treatment of nickel-titanium files, the newer ProTaper Gold files are more flexible and resistant to fracture (14). These newer files were included in the study for comparison with the original files.…”

Section: Discussionmentioning

confidence: 99%

Nominal Size and Taper Analysis of Novel Metallurgy NiTi Files

Islambasic¹,

Coelho²,

Pettiette³

et al. 2017

Eur Endod J

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Objective: The aim of this investigation was to assess the nominal tip diameter, taper and true pilot tip length of three nickel-titanium (NiTi) rotary files before and after use. Methods: Three brands of NiTi files of size 25.08 were evaluated: ProTaper Uni-versal (Dentsply Tulsa Specialties, Tulsa, USA), Channels PT (Insight Endo for Henry Schein, Melville, NY) and ProTaper Gold (Dentsply Tulsa Specialties), with ten files from each brand (total n=30). Scanning electron microscope (SEM) images of the files at 50x magnification were acquired before and after the files were used on endodontic training blocks, and the images were analysed by two independent investigators using ImageJ software. The nominal tip diameter (D0), taper and true pilot tip length (measured as the distance from the advertised diameter size of the file to the tip of the file) were recorded for each file and were analysed for statistical differences using repeated measures of analysis of variance (r-ANOVA) and Tukey's post-hoc test (P<0.05). Results:The marginal means of the nominal size showed statistically significant differences between brands of the same size; statistically significant differences were also observed between the advertised sizes and the actual sizes (P<0.001). The mean taper values showed statistically significant differences from the advertised (p<0.001) sizes, except for the ProTaper Gold (P=0.023) group. The changes in the true pilot tip length before and after use were not statistically significant (P>0.05). The pilot tip lengths varied between brands. Conclusion: All nominal tip diameters and most taper sizes of the analysed brands show statistically significant differences from the nominal sizes advertised by the manufacturers. The differences in true pilot tip lengths between brands indicate a current lack of standardization.

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Section: Discussionmentioning

confidence: 99%

Nominal Size and Taper Analysis of Novel Metallurgy NiTi Files

Islambasic¹,

Coelho²,

Pettiette³

et al. 2017

Eur Endod J

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“…This treatment is the same as that used in the ProTaper Gold instruments. Previous studies comparing ProTaper Universal with ProTaper Gold (with an identical geometric architecture and operation mode and only differences in the metallic alloy) demonstrated improved cyclic fatigue fracture resistance for the ProTaper Gold instruments (15)(16)(17). Therefore, better cyclic fatigue fracture resistance results of the WaveOne Gold instrument would be expected, especially when compared to the WaveOne instrument.…”

Section: Discussionmentioning

confidence: 96%

Bending resistance and cyclic fatigue life of a new single-file reciprocating instrument WaveOne Gold

Silva¹,

Tinoco²,

Tinoco³

et al. 2017

Eur Endod J

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Objective: The present study aimed to evaluate the bending resistance and cyclic fatigue fracture resistance of a new single-file reciprocating instrument called WaveOne Gold. Reciproc and WaveOne instruments were used as references for comparison. Methods: Sixty 25-mm NiTi instruments (Reciproc R25, WaveOne Primary and WaveOne Gold Primary) were tested. Flexibility was determined by applying 45° bending tests using a universal testing machine (n=10). A custom-made device was used during cyclic fatigue test (n=10), comprising a stainless steel artificial canal measuring 1.4 mm in diameter, 19 mm in total length with an 86° angle and 6 mm radius of curvature. Possible deformations at the helical shaft and mode of fracture were evaluated using scanning electron microscopy analysis. Statistical analysis was performed using one-way analysis of variance. Post hoc pair-wise comparisons were performed using Tukey's test for multiple comparisons (P<0.05). Results: WaveOne presented significantly higher bending resistance than the other tested systems (P<0.05), whereas Reciproc presented the lowest bending resistance (P<0.05). Reciproc revealed a significantly longer cyclic fatigue fracture resistance than the other systems (P<0.05). Conclusions: Although WaveOne Gold presented higher flexibility than WaveOne, no differences in the resistance to fatigue were observed between both systems. The Reciproc files were more flexible and resistant to fatigue for the angle of curvature of 86° and 6 mm radius than WaveOne and WaveOne Gold files.

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“…This provides the instruments with greater flexibility and a reduced restoring force. [23][24][25] These features may play a crucial role in extruding less debris. PTG also has a different geometry: smaller dimensions, off-centered mass, and a regressive taper.…”

Section: Discussionmentioning

confidence: 99%