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Coil Spring

R Holland, C Bain, A Utreja
OBJECTIVES: To analyze the expression of osteoblast differentiation markers and osteoclast activity in the periodontal ligament (PDL) following 2, 4 and 7 days of orthodontic tooth movement (OTM) in an animal model. SETTING AND SAMPLE POPULATION: Eighteen C57BL/6 wildtype mice. MATERIAL & METHODS: For the OTM model, orthodontic force was applied to the maxillary right first molar using a closed-coil NiTi spring activated between the molar and incisors...
March 6, 2019: Orthodontics & Craniofacial Research
Tarek El-Bialy, Ahmad Alobeid, Cornelius Dirk, Andreas Jäger, Ludger Keilig, Christoph Bourauel
AIMS: The aim of this study was to compare force loss due to friction (Fr) during simulated canine retraction using different archwire dimensions and materials between conventional and new self-ligating brackets. METHODS: The tested brackets were (1) conventional brackets (Victory series, GAC twin and FLI twin), (2) self-ligating brackets (Damon-Q, FLI-SL, new/improved FLI-SL (I FLI-SL), SPEED, GAC innovation (R) and Ortho Classic) and (3) a low-friction bracket (Synergy)...
February 13, 2019: Journal of Orofacial Orthopedics
Alec J Rice, Roberto Carrillo, Phillip M Campbell, Reginald W Taylor, Peter H Buschang
OBJECTIVES: To determine if posterior dental intrusion produces stable orthodontic and orthopedic corrections in growing retrognathic hyperdivergent patients. MATERIALS AND METHODS: The sample included 14 subjects (five males and nine females), who were 13.4 ± 0.7 years pretreatment, treated for 3.5 years, and followed for 3.6 years posttreatment. During the initial orthopedic phase, 150 g NiTi coil springs were attached to two palatal miniscrew implants (MSIs) for maxillary intrusion; two buccal mandibular MSIs were used for posterior vertical control...
February 11, 2019: Angle Orthodontist
Sudha Gudhimella, Abdelhamed Y Ibrahim, Divakar Karanth, Alex M Kluemper, Philip M Westgate, David A Puleo, Sarandeep S Huja
INTRODUCTION: Nonhuman animal models have been used extensively to study orthodontic tooth movement (OTM). However, rodent models have disadvantages, including a reported reduction in bone volume during OTM. The purpose of this study was to determine the viability of a skeletal anchorage and the effect of low force (∼3 cN) on interradicular bone volume during OTM. METHODS: Ninety Sprague-Dawley rats were divided into 5 time points. A miniscrew and a nickel titanium coil spring placed a load of 3 cN (experimental) or 0 cN (sham) on the maxillary first molar in a split-mouth design...
February 2019: American Journal of Orthodontics and Dentofacial Orthopedics
Andrew C Lamont, Abdullah T Alsharhan, Ryan D Sochol
Direct laser writing (DLW) is a three-dimensional (3D) manufacturing technology that offers significant geometric versatility at submicron length scales. Although these characteristics hold promise for fields including organ modeling and microfluidic processing, difficulties associated with facilitating the macro-to-micro interfaces required for fluid delivery have limited the utility of DLW for such applications. To overcome this issue, here we report an in-situ DLW (isDLW) strategy for creating 3D nanostructured features directly inside of-and notably, fully sealed to-sol-gel-coated elastomeric microchannels...
January 23, 2019: Scientific Reports
Shu-Ping Wu, Yi-Jui Huang, Teng-Fu Tsao, Yeu-Sheng Tyan, Chun-Hung Su
Purpose: This study sought to determine the association between twinkling artifacts on color Doppler ultrasound and different types of guidewires. Materials and Methods: Twenty-two commonly used guidewires were classified into three groups according to decreasing diameter (Group 1, 0.035"; Group 2, 0.018"; and Group 3, 0.014") and tested in vitro . Severity of twinkling was visually graded into four categories (0-3, from weak to strong). Results: The percentages (tips/shafts) of twinkling artifacts were 100%/100% for Group 1; 0%/33...
October 2018: Journal of Medical Ultrasound
Tomasz Szmuda, Paweł Słoniewski
BACKGROUND: A properly placed clip may slip off the aneurysm during the postoperative period. Many factors have been attributed to this complication, although clip adherence to the dural stitch has not been reported. MATERIALS AND METHODS: Following the single occurrence of such unusual complication, 64 similar medial cerebral artery (MCA) aneurysms were retrospectively investigated at a single institution. Clip adherence to the dura demonstrated in early postoperative computer tomography (CT) was a presumed factor of a late clip migration in this study...
January 15, 2019: Folia Morphologica (Warsz)
Haixia Geng, Hongli Su, John Whitley, Feng-Chang Lin, Xin Xu, Ching-Chang Ko
OBJECTIVE: To examine the effect of clinical use on both force retention and the deactivation of closed-coil nickel-titanium (NiTi) springs in a 16-week trial. METHODS: The force-activation curves for NiTi springs were determined before and after clinical use. The rate of tooth movement and maximum force (MF), hysteresis between activation and deactivation, and mean force of the deactivation plateau (MDF) were examined and correlated as a function of 4, 8, 12 and 16 weeks of clinical use...
January 7, 2019: Journal of International Medical Research
A N Shaddud, T F Kosyreva
The purpose of the study was to evaluate the force loss of orthodontic elastomeric chains with NiTi closed spring in artificial saliva by time. METHODS: The study samples comprised 40 elastomeric chains (20 Dentaurum, and 20 G & H) and 15 NiTi closed spring (GAC). The elastomeric chains were submerged in 36,6 ºC artificial saliva and stretched on the instrument of resin plates at a distance of 30 mm. With an electronic dynamometer the delivered force was evaluated at different intervals: at baseline, after 1 day, 4, 7, 14, 21 and 28 days...
2018: Stomatologii︠a︡
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
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