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Coil Spring

Dong-Jin Shin, Sanghyun Yoon, Wook-Hee Han, Jinhwan Kim, Kyung-Ho Cho, Jung-Hyuk Koh
In this research, energy harvesters with different types of spring-based shock absorbers were invested for the active shock absorber applications. Two different types of spring-based shock absorbers were prepared for the comparison, coil type spring-based shock absorbers and specially designed slice type spring-based shock absorbers. Shock absorbers have been widely employed to protect the complicated main system by cancelling the applied mechanical forces from outsides. Therefore, in the classical points of view, shock absorber can be prepared by the elastic materials to store and release the applied mechanical energy with sequentially in the form of elastic energy, thermal energy, and sound energy...
March 1, 2019: Journal of Nanoscience and Nanotechnology
Yangfan Cheng, Peina Huang, Bowen Meng, Lei Gan, Dongle Wu, Yang Cao
OBJECTIVE: This study aimed to investigate the antinociceptive effects of the selective adenylyl cyclase type 1 (AC1) inhibitor ST034307 on tooth movement nociception through orofacial nociceptive behavior tests and molecular examination. METHODS: We placed fixed nickel-titanium alloy closed-coil springs around the incisors of male Sprague-Dawley rats to induce tooth movement. We subsequently administered ST034307 (3 mg/kg), for 2 days, intraperitoneally, and then subjected the rats to a battery of behavioral tests (n = 10/group) to assess orofacial nociception...
November 14, 2018: Archives of Oral Biology
Je-Sung Koh
Performance of the shape memory alloy (SMA) coil spring actuator in cyclic actuation as an artificial muscle is strongly related to the mechanical design of the coil geometry. This paper proposes a practical design method for improving the frequency and efficiency of the SMA coil spring actuator; by designing the SMA coil spring to have large index (coil diameter/wire diameter) and pitch angle (LIP), cooling characteristics can be improved (increasing the actuation frequency) and large deformation can be obtained...
November 19, 2018: Materials
Jianping Zhou, Fengxue Yang, Xiaolin Xu, Gang Feng, Jun Chen, Jinglin Song, Hongwei Dai
BACKGROUND The aim of this study was to dynamically evaluate tooth movement, root resorption, and remodeling of alveolar bone using different forces to cause tooth movement in rats. MATERIAL AND METHODS 12-week-old male Sprague-Dawley rats were selected. Nickel-titanium (Ni-Ti) coil springs (20 g, 50 g, and 100 g forces) were placed for mesial movement of the left first maxillary molar teeth. Tooth movement, root resorption, and microarchitectural parameters of the trabecular bone were evaluated by in vivo micro-CT...
November 18, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
Luis Ernesto Arriola-Guillén, Gustavo Armando Ruíz-Mora, Yalil Augusto Rodríguez-Cárdenas, Aron Aliaga-Del Castillo, Heraldo Luis Dias-Da Silveira
INTRODUCTION: The aim of this study was to compare the root resorption (RR) of maxillary incisors after traction of unilateral vs bilateral impacted canines with reinforced anchorage. METHODS: This retrospective longitudinal study included 60 cone-beam computed tomography scans of patients with maxillary impacted canines: 30 scans taken before and 30 taken after orthodontic traction with nickel-titanium coil springs. Two groups were formed according to the impaction condition: 15 with unilateral maxillary impacted canines and 15 with bilateral maxillary impacted canines...
November 2018: American Journal of Orthodontics and Dentofacial Orthopedics
Beral Afacan, Veli Özgen Öztürk, Mine Geçgelen Cesur, Timur Köse, Nagihan Bostanci
Objective: To compare effect of two different orthodontic forces on maxillary canine distalization via evaluation of 30 analytes including cytokines, growth factors, and chemokines in gingival crevicular fluid (GCF) obtained from tension and compression sites. Design: Longitudinal, split-mouth, randomized controlled trial. Methods: The upper right and left canines were randomly distalized by a continuous force of either 75 or 150 g, in 15 individuals with Class II division 1 malocclusion...
October 12, 2018: European Journal of Orthodontics
Osmar Aparecido Cuoghi, Lorraine Perciliano de Faria, Edilson Ervolino, Sônia Regina Panzarini Barioni, Francielle Topolski, Victor Elias Arana-Chavez, Marcos Rogério de Mendonça
OBJECTIVE: The purpose of this study was to histologically evaluate pulp and dentin under induced tooth movement (ITM) with different types of forces. MATERIAL AND METHODS: The maxillary right first molars of rats were submitted to movement with continuous (CF), continuous interrupted (CIF) and intermittent (IF) forces during 5, 7 and 9 days with nickel-titanium (NiTi) closed-coil springs exerting 50cN force magnitude. The groups were histologically evaluated as for cellularity pattern, presence of dystrophic, hemodynamic alterations in the pulp as well dentin alterations...
October 4, 2018: Journal of Applied Oral Science: Revista FOB
Chanyuan Wang, Jun Peng, Minyu Zhou, Guancheng Liao, Xiao Yang, Hui Wu, Jun Xiao, Hao Feng
Transforming growth factor β-activated kinase 1 (TAK1) plays a vital role in IL-1-mediated NF-κB, JNK, and p38 activation in human and mammals. However, the function of TAK1 in teleost fish still remains largely unknown. To explore the role of TAK1 during the antiviral innate immune response of teleost fish, TAK1 of black carp (Mylopharyngodon piceus) was cloned and characterized in this paper. The open reading frame (ORF) of black carp TAK1 (bcTAK1) consists of 1626 nucleotides and the predicted bcTAK1 protein contains 541 amino acids, which includes a N-terminal Serine/Threonine protein kinases (S/TKc) and a C-terminal coiled-coil region...
September 28, 2018: Fish & Shellfish Immunology
Alissa Maria Varella, Ameet V Revankar, Anand K Patil
INTRODUCTION: The aim of this investigation was to evaluate the effects of low-level laser therapy on interleukin-1β (IL-1β) levels in gingival crevicular fluid and its correlation with orthodontic tooth movement. METHODS: A split-mouth design was used in 10 subjects (6 female, 4 male) aged 14 to 25 years, whose maxillary first premolars were extracted. A gallium-aluminum-arsenide semiconductor diode laser (wavelength, 940 nm; energy density, 8 J/cm2; power output, 100 mW) delivered low-level laser therapy to the experimental canine undergoing distalization at 10 points...
October 2018: American Journal of Orthodontics and Dentofacial Orthopedics
A N Shaddud, T F Kosyreva
The purpose in this study was to compare the force decay of laboratory and clinical NiTi closed coil springs. Specimens were 30 NiTi coil springs (clinical) and 15 (laboratory in artificial saliva 36.6 ºC) springs were tested by dynamometer to evaluate force loos at different intervals: 1, 2 and 3 months of use. Data (gF) were analyzed statistically using. Clinical and laboratory data were compared to evaluate effect of the oral environment on force loss. It was observed a significant force loss of NiTi springs...
2018: Stomatologii︠a︡
Xiaohui Yang, Weihong Wang, Menghe Miao
Miniature linear actuators, also known as artificial muscles, mimic the contractile action of skeletal muscles and have potentials in applications, such as soft robotics, prosthetics, exoskeletons, and smart textiles. Natural fibers commonly used in textiles, such as wool, cotton, and flax, are highly anisotropic materials in response to moisture stimulus. Here, we report that this anisotropic property of the natural fibers can be utilized to provide musclelike contractile motions when they are constructed into springlike cylindrical coils by twist insertion...
September 26, 2018: ACS Applied Materials & Interfaces
Zahra Khalid, Azhar Ali Bangash, Ayesha Anwar, Hajra Pasha, Erum Amin
OBJECTIVE: To compare the mean change of tooth movement in canine retraction between elastic module and Ni Ti coil spring. STUDY DESIGN: Comparative study. PLACE AND DURATION OF STUDY: Orthodontics Department, Armed Forces Institute of Dentistry, Rawalpindi, from May 2015 to January 2016. METHODOLOGY: Thirty-two patients were inducted. After alignment and extraction of maxillary first premolars, canine retraction was started with closed Ni Ti coil spring on one side of the maxillary arch and with active tie back on the other side...
September 2018: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
Azita Tehranchi, Hossein Behnia, Fereydoun Pourdanesh, Parsa Behnia, Nelson Pinto, Farnaz Younessian
Objective: The aim of this study was to evaluate the effect of LPRF, placed in extraction sockets, on orthodontic tooth movement (OTM). Materials and Methods: Thirty extraction sockets from eight patients (five males, three females, with a mean age of 17.37 years; range 12-25 years) requiring extraction of first premolars based on their orthodontic treatment plan participated in this split-mouth clinical trial. In one randomly selected quadrant of each jaw, the extraction socket was preserved as the experimental group by immediate placement of LPRF in the extraction socket...
July 2018: European Journal of Dentistry
Jin-Jie Cui, Xu-Xia Wang, Yuan Wang, Pei-Pei Chen, Dan Ma, Jun Zhang
PURPOSE: This study investigated the effect of local injection of akebiasaponin D (ASD) with different concentrations on the rate of orthodontic tooth movement in rats. METHODS: Forty 6-week-old female Wistar rats were randomly divided into 4 groups with 10 rats in each group. Animal model for orthodontic tooth movement was established. The upper first molars of the rats were moved mesially by coil springs(force=40 g). ASD solution at the concentration of 5 mg/kg was locally injected in ASD1 group, and ASD solution at the concentration of 10 mg/kg was locally injected in ASD2 group...
April 2018: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
Mihri Amasyalı, Fidan Alakuş Sabuncuoğlu, Şeniz Karaçay, Mehmet Doğru, Handan Altuğ
Objective: Our objective was to investigate and quantify the treatment of micro-implant-aided retraction and torque (R&T) arch on dentofacial structures. Methods: Twelve patients (mean age 21.2 years) who required orthodontic camouflage treatment were included in the study. Following the canine distalization, mini-screws were placed between maxillary first molars and second premolars, and R&T arch was applied for the retraction of incisors. The vertical retraction arms of the arch were adjusted between the apex of the lateral incisor and the alveolar bone so that the retraction force passed through the center of resistance of four incisors and forced the incisors to bodily retraction...
March 2018: Turkish journal of orthodontics
Nilüfer İrem Tunçer, Ayça Arman Özçırpıcı
A 17-year-old female patient, whose chief complaint was her unpleasing smile, had skeletal and dental class II malocclusion, hypodivergent facial type with a severely increased overbite. Among the treatment options, upper-first-premolar extractions followed by miniscrew-supported en-masse retraction was the treatment of choice. After the initial levelling and alignment, miniscrews with 1.5- to 1.4-mm diameter and 7-mm lenght, were installed between the roots of the second premolars and the first molars, bilaterally...
September 2017: Turkish journal of orthodontics
Jianyang Wu, Qiao Shi, Zhisen Zhang, Hong-Hui Wu, Chao Wang, Fulong Ning, Senbo Xiao, Jianying He, Zhiliang Zhang
Entwining-induced robust natural biosystems show superior mechanical performances over their counterparts. However, the role played by topological entwinement in the mechanical properties of artificial nanohelixes remains unknown. Here, the tensile characteristics of nano-entwined carbon nanocoil (ECNC) metamaterials are explored by atomistic simulations. The simulation results show that ECNCs exhibit heterogeneous pre-stress distribution along the spiral surfaces. The predicted stretching stress-strain responses correlate with the topological nano-entwining and dimensionality...
August 23, 2018: Nanoscale
Christian Kirschneck, Erika Calvano Küchler, Ulrich Wahlmann, Peter Proff, Agnes Schröder
BACKGROUND: NSAID analgesics have found widespread use in the treatment of pain, inflammation and fever. The highly COX-2-selective NSAID etoricoxib has shown a favorable side effect profile and excellent analgesic efficacy, particularly for dental and orthodontic pain, surpassing the current standard analgesic in orthodontics, acetaminophen. However, potential side effects on the rate of orthodontic tooth movement (OTM) and cranial growth, relevant for clinical usability during orthodontic treatment, have not yet been investigated...
November 2018: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
Xingcheng Lin, Jeffrey K Noel, Qinghua Wang, Jianpeng Ma, José N Onuchic
Influenza hemagglutinin (HA) mediates viral entry into host cells through a large-scale conformational rearrangement at low pH that leads to fusion of the viral and endosomal membranes. Crystallographic and biochemical data suggest that a loop-to-coiled-coil transition of the B-loop region of HA is important for driving this structural rearrangement. However, the microscopic picture for this proposed "spring-loaded" movement is missing. In this study, we focus on understanding the transition of the B loop and perform a set of all-atom molecular dynamics simulations of the full B-loop trimeric structure with the CHARMM36 force field...
August 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
Yukari Minato, Masaru Yamaguchi, Mami Shimizu, Jun Kikuta, Takuji Hikida, Momoko Hikida, Masaaki Suemitsu, Kayo Kuyama, Kazutaka Kasai
Objective: Orthodontic root resorption (ORR) due to orthodontic tooth movement is a difficult treatment-related adverse event. Caspases are important effector molecules for apoptosis. At present, little is known about the mechanisms underlying ORR and apoptosis in the cementum. The aim of the present in vivo study was to investigate the expression of tartrate-resistant acid phosphatase (TRAP), caspase 3, caspase 8, and receptor activator of nuclear factor kappa-B ligand (RANKL) in the cementum in response to a heavy or an optimum orthodontic force...
July 2018: Korean Journal of Orthodontics
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