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
Medicine, General & Internal
Changjian Li, Le Liu, Yanfeng Li, Xin Wang, Haiyun Liu, Jiaxin Bao, Jing Wang, Jiadong Fan
Summary: The study found that only 5% sodium hypochlorite can affect the diameter of rotary nickel-titanium instruments, and other disinfectants do not reduce the instrument's fracture resistance. The breaking positions of instruments mainly occurred at the bending segment of the root canal, with a higher breaking frequency closer to the apical foramen.
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
Materials Science, Multidisciplinary
Jihye Hong, Sang Won Kwak, Jung-Hong Ha, Asgeir Sigurdsson, Ya Shen, Hyeon-Cheol Kim
Summary: This study compared the fatigue resistance of files made from different heat treatment methods and surface treatment. Four prototype files were created and tested, and it was found that the file that underwent a specific temperature heat treatment with titanium coating surface treatment showed the highest fatigue resistance.
Article
Chemistry, Multidisciplinary
Taro Nakatsukasa, Arata Ebihara, Moe Sandar Kyaw, Satoshi Omori, Hayate Unno, Shunsuke Kimura, Keiichiro Maki, Takashi Okiji
Summary: This study investigated the impact of a one-sided radial-landed cross-sectional design of a heat-treated nickel-titanium rotary instrument on torque/force generation and canal-shaping ability. The study found that this design resulted in smaller screw-in forces but similar canal-centering ability.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Physical
Rashid El Abed, Dana Al Raeesi, Aisha Alshehhi, Zuhair Alkhatib, Amar H. Khamis, Mohamed Jamal, Hyeon-Cheol Kim
Summary: This study aimed to assess the effect of mechanical loading and heating on the cyclic fatigue and torsional fracture resistances of heat-treated nickel-titanium files after usage and autoclaving. The results showed that autoclave sterilization did not improve the fracture resistance of the files, but used files had higher cyclic fatigue resistance compared to sterilized files. The torsional toughness and distortional angle were higher in new files compared to used and sterilized files.
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
Chemistry, Physical
Sebastian Buerklein, David Donnermeyer, Tim Julian Hentschel, Edgar Schaefer
Summary: This study evaluated the performance of five rotary nickel-titanium instruments in preparing curved root canals. The results showed that all instruments performed well, with Jizai instruments exhibiting the best shaping ability and minimal adjustments to canal curvature.
Article
Orthopedics
Anna Wallace, James Amis, Guy Cafri, Paul Coplan, Jennifer Wood
Summary: The study aimed to evaluate the risk of breakage of TFNA proximal femoral nails compared to other cephalomedullary nails, and the results showed that the risk of nail breakage was equivalent between TFNA nails and the comparator cephalomedullary nails within 18 months.
JOURNAL OF BONE AND JOINT SURGERY-AMERICAN VOLUME
(2021)
Article
Dentistry, Oral Surgery & Medicine
Ahmad Abdel Hamid Elheeny, Mahmoud Ahmed Abdelmotelb
Summary: Comparison of postoperative pain intensity between two single-file systems with different kinetics showed no significant difference.
INTERNATIONAL JOURNAL OF PAEDIATRIC DENTISTRY
(2022)
Article
Chemistry, Multidisciplinary
Carlo Prati, Joao Paulo Mendes Tribst, Amanda Maria de Oliveira Dal Piva, Alexandre Luiz Souto Borges, Maurizio Ventre, Fausto Zamparini, Pietro Ausiello
Summary: The stress distribution generated in the root dentine canal during mechanical rotation of five different NiTi endodontic instruments was calculated using finite element analysis. Conventional Ni-Ti instruments demonstrated higher stress magnitudes in curved areas, while heat-treated instruments with higher flexibility showed reduced stress concentration. The mechanical behavior of all rotary endodontic instruments was affected by different elastic moduli and dentine canal rigidity.
APPLIED SCIENCES-BASEL
(2021)
Review
Dentistry, Oral Surgery & Medicine
Nm Grande, R. Castagnola, I Minciacchi, L. Marigo, G. Plotino
Summary: The introduction of nickel-titanium mechanical instruments has significantly impacted clinical endodontics by improving root canal preparation outcomes and reducing associated risks. Heat treatment and new kinematics have played crucial roles in enhancing the fatigue resistance, flexibility, safety, and efficiency of these instruments.
AUSTRALIAN DENTAL JOURNAL
(2023)
Article
Chemistry, Physical
Alessio Zanza, Marco Seracchiani, Rodolfo Reda, Dario Di Nardo, Gianluca Gambarini, Luca Testarelli
Summary: This study evaluated the role of the crystallographic phase of Nickel-titanium rotary instruments in determining their torsional resistance under different bending conditions. The results show that the crystallographic phase influences the maximum torque at fracture when the instruments are subjected to severe bending, and the radius of curvature significantly influences their torsional resistance.
Article
Engineering, Chemical
Adam Racz, Barnabas Csoke
Summary: Understanding the breakage behavior of different components in waste materials is crucial for comminution. The breakage probability of materials is influenced by stress type and velocity in comminution tests, with rotor speed having a significant impact on breakage probability in hammer shredders.
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
Dentistry, Oral Surgery & Medicine
He Liu, Kiarash Shabehpour, Zhejun Wang, Tyler Sobotkiewicz, Sang Won Kwak, Markus Haapasalo, N. Dorin Ruse, Jeffrey M. Coil, Franklin R. Tay, Ya Shen
Summary: This study examined the defect characteristics of clinically-used, discarded nickel titanium rotary retreatment instruments and found that plastic deformation can be used as a warning sign for instrument separation.
JOURNAL OF DENTISTRY
(2022)
Review
Chemistry, Physical
Sang Won Kwak, Ya Shen, He Liu, Hyeon-Cheol Kim, Markus Haapasalo
Summary: Understanding the characteristics of nickel-titanium files is crucial for dentists due to their popularity in root canal therapy. The torque required to rotate the files is considered a parameter for stress generation, and understanding the conditions that may cause instrument fractures is important. The stress generated during root canal shaping can lead to microcracks in the instruments and dentinal wall, emphasizing the need to prevent fractures. Various experimental approaches have been used to measure this stress, and this review focuses on the stress generated under different experimental conditions and the factors related to torque generation.
Article
Engineering, Biomedical
Mauricio Goncalves da Costa Sousa, Gabriela Conceicao de Almeida, Danilo Cesar Martins Mota, Rosiane Andrade da Costa, Simoni Campos Dias, Samuel Nunes Limberger, Frank Ko, Li Ting Lin, Evan F. Haney, Hashem Etayash, Beverlie Baquir, Michael J. Trimble, Ya Shen, Zheng Su, Markus Haapasalo, Daniel Pletzer, Leticia Chaves de Souza, Glaucia Schuindt Teixeira, Renato M. Silva, Robert E. W. Hancock, Octavio Luiz Franco, Taia Maria Berto Rezende
Summary: This article introduces a multifunctional scaffold material for dental pulp regeneration, which has antibacterial and immunomodulatory activities, and achieves pulp-like tissue formation in vivo.
BIOACTIVE MATERIALS
(2022)
Article
Dentistry, Oral Surgery & Medicine
Hind Al-Zuhair, Zheng Su, He Liu, Zhejun Wang, Markus Haapasalo, Ahmed Hieawy, Yuan Gao, Ya Shen
Summary: This study compared the antibacterial effects of different agitation devices on single- and multispecies biofilms in dentin canals. The results showed that agitating NaOCl can more effectively kill biofilms. EDDY was as effective as PUI when combined with NaOCl, but the antimicrobial efficiency in the apical portion was still a concern.
Article
Dentistry, Oral Surgery & Medicine
Evan Baird, Xiangya Huang, He Liu, Ahmed Hieawy, N. Dorin Ruse, Zhejun Wang, Markus Haapasalo, Ya Shen
Summary: A dynamic model was developed to evaluate the fatigue resistance of instruments at body temperature. The study found that the combination of rotational and axial movement led to greater fatigue resistance compared to rotational movement alone. Additionally, the curvature near the apex had a greater impact on fatigue resistance than curvatures in the coronal and middle thirds.
AUSTRALIAN ENDODONTIC JOURNAL
(2023)
Article
Engineering, Biomedical
Yue Xu, Yuan You, Luyao Yi, Xiaoyi Wu, Yaning Zhao, Jian Yu, He Liu, Ya Shen, Jingmei Guo, Cui Huang
Summary: A stimuli-responsive multidrug delivery system has been developed in this study, which can prevent tooth decay and promote enamel restoration. The system can identify cariogenic conditions, intelligently release drugs, and restore the microarchitecture and mechanical properties of demineralized teeth.
BIOACTIVE MATERIALS
(2023)
Article
Engineering, Biomedical
Fushi Wang, Xinjie Cai, Ya Shen, Liuyan Meng
Summary: This review discusses the effects of various types of scaffold materials on cell-scaffold interaction in tissue engineering. It elaborates on the influence of the physical, chemical, mechanical, and biological characteristics of scaffold materials on cell-scaffold interaction. The review also examines the role of scaffold components, degradation process, and degraded products in cell-scaffold interactions. Furthermore, it summarizes the latest research progress on cell-scaffold interactions among various engineered tissues or organs in the oral and craniofacial region.
BIOACTIVE MATERIALS
(2023)
Article
Engineering, Biomedical
Jian Yu, Haolin Bian, Yaning Zhao, Jingmei Guo, Chenmin Yao, He Liu, Ya Shen, Hongye Yang, Cui Huang
Summary: As a global public health focus, oral health plays a vital role in overall health. Defected teeth with exposed dentin increase the risk of oral diseases such as hypersensitivity and inflammation. The E/PA@HMS nanosystem effectively occludes dentinal tubules, inhibits biofilm formation, induces collagen mineralization, and promotes odontogenic differentiation and mineralization of dental pulp cells. Animal experiments demonstrate its long-lasting effects in sealing tubules and inhibiting biofilm growth. This nanosystem shows promising benefits for protecting exposed dentin.
BIOACTIVE MATERIALS
(2023)
Article
Dentistry, Oral Surgery & Medicine
Jinghao Hu, Jian Yu, He Liu, Zhejun Wang, Markus Haapasalo, Evan F. Haney, Robert E. W. Hancock, Shuli Deng, Ya Shen
Summary: This study evaluated the antimicrobial effects of commercially available mouthrinses and a D-enantiomeric peptide on oral multispecies biofilms. The results showed that DJK-5 demonstrated the highest percentage of dead bacteria and may be a potential candidate for future mouthrinses.
JOURNAL OF DENTISTRY
(2023)
Article
Dentistry, Oral Surgery & Medicine
He Liu, Stefanie Nio, Ya Shen
Summary: This study evaluated the efficacy of different concentrations of sodium hypochlorite at various exposure times and temperatures against Enterococcus faecalis biofilms in human dentinal tubules. The results showed no significant differences in effectiveness between the 2% and 5.25% sodium hypochlorite solutions at different temperatures or exposure times. Increasing the temperature or exposure time of sodium hypochlorite was found to be more important than raising its concentration to optimize its effectiveness in killing E. faecalis while minimizing potential damage.
Article
Materials Science, Multidisciplinary
Jihye Hong, Sang Won Kwak, Jung-Hong Ha, Asgeir Sigurdsson, Ya Shen, Hyeon-Cheol Kim
Summary: This study compared the fatigue resistance of files made from different heat treatment methods and surface treatment. Four prototype files were created and tested, and it was found that the file that underwent a specific temperature heat treatment with titanium coating surface treatment showed the highest fatigue resistance.
Article
Infectious Diseases
Luana Dutra de Carvalho, Bernardo Urbanetto Peres, Ya Shen, Markus Haapasalo, Hazuki Maezono, Adriana P. Manso, Frank Ko, John Jackson, Ricardo M. Carvalho
Summary: This study successfully encapsulated and controlled the release of chlorhexidine using cellulose acetate nanofibers as a drug carrier for the treatment of dental bacterial infections. The nanofiber mats produced were thin, flexible and strong, allowing for intimate contact with surfaces and effective bacterial killing.
Article
Medicine, General & Internal
Ying Li, Zhengyang Wang, Pingping Bao, Tingting Meng, Meng Liu, Huixu Li, Ya Shen, Dayong Liu, Zhi Jia, He Liu
Summary: This study aimed to compare the cleaning and disinfecting efficiency of oval-shaped root canals using XP-endo Shaper (XPS), ProTaper Next (PTN), and HyFlex CM (HCM) in combination with passive ultrasonic irrigation (PUI). Results showed that XPS outperformed PTN and HCM in disinfecting the root canals. However, removing hard tissue debris from the critical apical area remained challenging.
MEDICINA-LITHUANIA
(2023)
Article
Dentistry, Oral Surgery & Medicine
Dan Wang, Jian Yu, He Liu, Tian Zhang, Evan F. Haney, Robert E. W. Hancock, Lin Peng, Ya Shen
Summary: This study aimed to investigate the effectiveness of DJK-5-D enantiomeric antibiofilm peptide on the corrosion resistance of titanium with different surface roughness. The results showed that DJK-5 effectively enhanced the corrosion resistance of titanium while killing S. mutans biofilms, with smooth surfaces more susceptible to peptide treatment.
JOURNAL OF DENTISTRY
(2023)
Article
Dentistry, Oral Surgery & Medicine
Kayi Lui, He Liu, Hao Wang, Xueqin Yang, Dingming Huang, Xuedong Zhou, Yuan Gao, Ya Shen
Summary: The objective of this study was to develop a customized framework for evaluating registration accuracy and measuring the untouched surface area of canal instrumentation. The results showed a significant difference between manual and automatic registration, while there was no difference in the untouched surface measure methods. There was a correlation between registration accuracy and untouched surface area.
CLINICAL ORAL INVESTIGATIONS
(2023)
