Article
Medicine, General & Internal
Vicente Faus-Matoses, Vicente Faus-Llacer, Celia Ruiz-Sanchez, Sharon Jaramillo-Vasconez, Ignacio Faus-Matoses, Benjamin Martin-Biedma, Alvaro Zubizarreta-Macho
Summary: The present study evaluated and compared the function of the rotational speed of NiTi alloy endodontic rotary files in terms of their resistance to dynamic cyclic fatigue. The results showed that NiTi alloy endodontic rotary files with reciprocating movement at a lower speed exhibited greater resistance to fatigue.
JOURNAL OF CLINICAL MEDICINE
(2022)
Article
Chemistry, Physical
Philip Y-H. Chien, Jorge N. R. Martins, Laurence J. Walsh, Ove A. Peters
Summary: This study evaluated and compared the effects of ambient temperature and post-manufacture heat-treatment on the mechanical behavior of nickel-titanium wires. The results showed that temperature changes had no significant effect on the martensitic modulus of elasticity, maximum transformation strain, and ultimate tensile stress, but the austenitic modulus of elasticity and transformation stress increased with temperature. It was also found that differences in manufacturing/heat treatment conditions and ambient temperature could affect the mechanical behavior of nickel-titanium.
Article
Dentistry, Oral Surgery & Medicine
Myint Thu, Arata Ebihara, Keiichiro Maki, Miki Nishijo, Shunsuke Kimura, Taro Nakatsukasa, Moe Sandar Kyaw, Takashi Okiji
Summary: This study evaluated the effect of different metallurgy and faster upward speed pecking motions on the dynamic cyclic fatigue resistance of nickel-titanium rotary instruments. The results showed that the fastest upward speed group exhibited higher cyclic fatigue resistance, and ProTaper Gold instruments performed better in terms of fatigue resistance in all groups.
Article
Chemistry, Physical
Hayate Unno, Arata Ebihara, Keiko Hirano, Yuka Kasuga, Satoshi Omori, Taro Nakatsukasa, Shunsuke Kimura, Keiichiro Maki, Takashi Okiji
Summary: This study compared the mechanical properties and root canal shaping abilities of TruNatomy (TRN) with existing instruments. The results showed that TRN performed better in terms of load values, cycles to fracture, torque, and vertical force.
Article
Chemistry, Multidisciplinary
Hoang-Lan-Anh Le, Thuan-Loc Tran, Thu-Thuy Nguyen, Tran-Lan-Khue Pham, Van-Khoa Pham
Summary: The study aimed to measure the number of cycles leading to fracture (NCF) in stainless steel double-curved canals under static and dynamic cyclic fatigue situations at body temperature. Different groups of ProTaper Universal and ProTaper Next instruments were tested using proprietary programs and the rotations before fracture were recorded. The results showed that ProTaper Next had the highest NCF in dynamic cycles, while ProTaper Universal had the lowest NCF in static condition. The study suggests that factors such as rotation modes, materials, and design influence the cyclic fatigue resistance of the instruments.
APPLIED SCIENCES-BASEL
(2023)
Article
Dentistry, Oral Surgery & Medicine
Rashid El Abed, Aisha Alshehhi, Yoo Jung Kang, Dana Al Raeesi, Amar H. Khamis, Mohamed Jamal, Hyeon-Cheol Kim
Summary: This study evaluated the dynamic cyclic fatigue resistance of heat-treated nickel-titanium files after usage and autoclaving. The results showed that the cyclic fatigue resistance of the files may decrease after usage, and further decrease after sterilization.
JOURNAL OF ENDODONTICS
(2022)
Article
Dentistry, Oral Surgery & Medicine
Walid Nehme, Alfred Naaman, Franck Diemer, Maria Laura Leotta, Giusy Rita Maria La Rosa, Eugenio Pedulla
Summary: The objective of this study was to evaluate the influence of different heat treatments and temperatures on the cyclic fatigue resistance of 2Shape instruments. The results showed that CM-Wire instruments exhibited the highest cyclic fatigue resistance. Body temperature negatively affected the cyclic fatigue resistance of certain instruments compared with room temperature.
CLINICAL ORAL INVESTIGATIONS
(2023)
Article
Multidisciplinary Sciences
Rahaf A. Almohareb, Reem M. Barakat, Fahda N. Algahtani, Manal F. Alkadi
Summary: This in vitro investigation explored the influence of multiple autoclave cycles on the cyclic fatigue resistance of three heat-treated nickel-titanium (NiTi) files. The results showed that ETP files had significantly greater resistance to cyclic fatigue than TN files in all autoclave groups. Repeated autoclave cycles improved the cyclic fatigue resistance of ETP files, but did not affect the cyclic fatigue resistance of TN and PTG files.
Review
Dentistry, Oral Surgery & Medicine
Yuhong Liang, Lin Yue
Summary: This review introduces the terms and concepts of engine-driven nickel-titanium (NiTi) endodontic files, as well as the improvements and advancements in different generations of these instruments. Continuous advancements have resulted in better shaping efficiency and resistance in NiTi systems. In clinical practice, the appropriate system should be chosen based on root canal anatomy, instrument characteristics, and operator experience.
INTERNATIONAL JOURNAL OF ORAL SCIENCE
(2022)
Article
Chemistry, Physical
Jorge N. R. Martins, Emmanuel J. N. L. Silva, Duarte Marques, Mario Rito Pereira, Victor T. L. Vieira, Sofia Arantes-Oliveira, Rui F. Martins, Francisco Braz Fernandes, Marco Versiani
Summary: The current study compares the F1 endodontic instruments from five different heat-treated rotary systems in terms of their design, metallurgical properties, and mechanical performance. It is found that the instruments have similar nickel/titanium ratio and overall design, but differ in their performance. Super Files Blue shows the best durability, while Premium Taper Gold and Go-Taper Flex are more flexible.
Article
Dentistry, Oral Surgery & Medicine
Suhad Jabbar Hamed Al-Nasrawi, Zuha Ayad Jaber, Nibrass Talib Al-Quraine, Abtesam Imhemed Aljdaimi, Sattar Jabbar Abdul-Zahra Al-Hmedat, Saleh Zidan, Julfikar Haider
Summary: Peracetic acid (PAA) is widely used as a sterilizing/disinfecting agent in endodontics. This study investigated the impact of PAA on the cyclic fatigue resistance of three types of commercial heat-treated nickel-titanium (NiTi) rotary files. Results showed that exposure to PAA significantly reduced the cyclic fatigue resistance of all tested files, with PTG demonstrating the best performance. Different concentrations of PAA had varying effects on the cyclic fatigue resistance of the files.
INTERNATIONAL JOURNAL OF DENTISTRY
(2021)
Article
Dentistry, Oral Surgery & Medicine
Khoa Van Pham
Summary: This study investigated the transformation temperatures of three nickel-titanium instruments before and after simulated clinical uses. The results showed no significant difference in transformation temperatures after sterilization procedures. Neoniti had the highest A(f) temperature, while HyFlex CM Pro had the lowest. The higher A(f) temperatures of the instruments compared to human body temperature indicate increased flexibility in clinical use.
Article
Dentistry, Oral Surgery & Medicine
Gabiana Rodrigues Freitas, Thais Marchand Ribeiro, Fabiana Soares Grecca Vilella, Tiago Andre Fontoura de Melo
Summary: This study evaluated the influence of endodontic cavity access into molars on the chemomechanical preparation of curved root canals. The results showed that there was no significant difference in the transport and centralization of endodontic instruments between conventional and minimally invasive access types. Therefore, the type of cavity access did not affect the preparation of curved root canals with 0.25 and 0.04 taper instruments.
CLINICAL ORAL INVESTIGATIONS
(2021)
Article
Chemistry, Physical
Michal Bumbalek, Zdenek Joska, Zdenek Pokorny, Josef Sedlak, Jozef Majerik, Vlastimil Neumann, Karel Klima
Summary: This study investigated the possibility of using low-temperature plasma nitriding technology to improve the properties and fatigue life of NiTi dental instruments. The results showed that nitriding process can significantly increase the fatigue life of NiTi instruments in some cases. Nitrided files have promising possibilities for enhancing the surface properties and quality.
Article
Education, Scientific Disciplines
Alessio Zanza, Paola Russo, Paola Di Matteo, Rodolfo Reda, Dario Di Nardo, Gianluca Gambarini, Luca Testarelli
Summary: The aim of this study was to explain the mechanical differences between EdgeTaper Platinum (ETP) and ProTaper Gold (PTG) and the composition of their alloys. The results showed that ETP F2 had higher cyclic fatigue resistance and bending ability than PTG F2, while PTG had higher torsional resistance. DSC and EDX analysis also confirmed the differences between the two alloys.