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6 rev port estomatol med dent cir maxilofac. 2021;62(1):1-8

Figure 5. Mechanical behavior results of the tested SX files are shown by combined box -and -whisker plots (left) of
torque, angle of rotation, and bending load. The blue colored boxes indicate that the obtained results of the replica -like
instruments were similar to the reference brand (ProTaper Gold), while red colored boxes show significant differences.
The triangular graphic (right) shows the significant differences between groups (red line represents a P<0.05).

ed by well -known companies that can be defined as premi- systems tested in the present study possess the CE 0197 cer-
um brands. Research, development, and marketing factors tificate, which means that they match the standards of med-
are of huge importance when weighting the final product ical quality demanded by the European Community (a certifi-
price since they represent the amount of time, effort, and cation equivalent to the Food and Drug Administration in the
money applied by the companies to create and promote their United States). Despite the lack of information regarding their
products. However, other factors such as product unique- performance and safety, their reduced price may compensate
ness, market competition, product effectiveness, interna- due to the high costs of NiTi rotary systems, as previously re-
tional patents, health safety certificates, and profit must also ported by clinicians. 6,9
be considered. 13,14 The present study aimed to compare two PTG SX replica-
In the past few years, some less -known companies came -like instruments with the original brand using a multi-
into the market with mechanical NiTi systems similar to those method research to assess different aspects such as design,
produced by premium brand companies, the so -called replica- metallurgic features, and mechanical performance. 8,16
-like systems. 8,15 Although these companies’ time, effort, and Overall, no differences were observed among the tested in-
investment are not clear, the reality is that their products are struments in the number of blades, helix angle, design sym-
marketed at a much lower price, which in the case of the ones metry, cross -sectional geometry, and Ti/Ni atomic percent-
here studied may be as low as 29% of the original premium age. However, differences were observed in the tip design,
brand product. It is important to notice that both replica -like surface finishing, phase transformation temperatures, and