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J Dent Res Dent Clin Dent Prospects. 2021;15(2): 76-81.
doi: 10.34172/joddd.2021.013
  Abstract View: 352
  PDF Download: 284
  Full Text View: 37

Basic Research

Original Article

Effects of repeated sterilization cycles on the surface alterations of ProTaper Next, TF Adaptive, HyFlex CM, and 2Shape instruments

Olcay Özdemir 1* ORCID logo, Sibel Koçak 2 ORCID logo, Mustafa Murat Koçak 2 ORCID logo, Baran Can Sağlam 2 ORCID logo

1 Department of Paediatric Dentistry, Faculty of Dentistry, Zonguldak Bülent Ecevit University, Turkey
2 Department of endodontic Dentistry, Faculty of Dentistry, Zonguldak Bülent Ecevit University, Turkey
*Corresponding author: Olcay Özdemir, Email: ozdemir.olcay@yahoo.com

Abstract

Background. This study aimed to evaluate the effects of repeated sterilization cycles on the surface alterations of various nickel-titanium instruments, including ProTaper Next (PTN), TF Adaptive (TFA), HyFlex CM (HCM), and 2Shape (2S).

Methods. Twenty-four new NiTi files of four different alloys were selected. The instruments in each group were divided into two equal groups, as follows: control and sterilization. The first group was chosen as the control without applying any sterilization procedure, while in group 2, five cycles of sterilization procedures were applied. The surface topographies were evaluated using scanning electron microscope (SEM) and atomic force microscope (AFM). The root mean square (RMS) and maximum height (MH) values and three-dimensional images were recorded. The data were analyzed with the Shapiro-Wilk test, one-way ANOVA, and post hoc Tukey tests. The statistical significance level was set at P≤0.05.

Results. Before the experiment, HCM demonstrated the highest RMS value, and 2S showed the lowest. After the procedures, the RMS and MH values deteriorated on the surface of PTX, TFA, and 2S (P<0.001). The HCM was not affected by sterilization processes (P>0.05).

Conclusion. The initial irregularity on the surface did not affect the rate of alteration. The HCM files demonstrated superior surface properties after several cycles of sterilization. The PTN, TFA, and 2S presented similar surface responses after five cycles of autoclave sterilization.

Keywords: 2Shape, Atomic force microscope, HyFlex CM, ProTaper Next, Sterilization, TF-Adaptive
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Submitted: 14 May 2020
Accepted: 08 Oct 2020
ePublished: 05 May 2021
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