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Coil Spring

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 9, 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...
July 23, 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...
July 16, 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
Amy Liao, Hobart W Harris, Michel M Maharbiz
OBJECTIVE: Ventral hernia repairs using mesh prosthetics suffer from high recurrence rates, with 10-20% of repairs failing within three years. Uneven distribution of stress within the implanted mesh prosthetic is thought to contribute to the high recurrence rate. We propose a method for providing quantitative guidance and monitoring of hernia repairs using an array of magnetoelastic strain sensors. METHODS: The magnetoelastic strain sensors presented here are based on a coupled design to achieve measurements with higher signal-to-noise ratio (SNR)...
May 8, 2018: IEEE Transactions on Bio-medical Engineering
D Hebenstreit
String instruments such as electric guitars are often equipped with a vibrato system, which allows varying the pitch of all strings as a musical effect. It is usually based on a mobile bridge that is kept in balance by the strings and a coiled spring. Tuning such an instrument is complex, since adjusting the tension on one string will alter all other strings' tensions. In practice, a heuristic method is used where all strings are repeatedly tuned to the desired pitch, which appears to reliably yield correct pitches after a while...
June 2018: Journal of the Acoustical Society of America
Mari Kaneko, Satoshi Fujita, Noriyoshi Shimizu, Mitsuru Motoyoshi, Masayuki Kobayashi
During orthodontic treatment, binding teeth, may change the topographically organized representation of teeth in the cerebral cortex. To test the hypothesis that experimental tooth movement (ETM) changes the somatotopy of an individual tooth arrangement in the somatosensory cortex, we examined the spatiotemporal features of cortical excitatory propagation in response to mechanical stimulation of the maxillary incisor or molar using optical imaging in late adolescent rats without or with ETM. The ETM models consisted of 1d, 3d, and 7d ETM in which a closed-coil spring was ligated between the maxillary first molar and incisors...
June 18, 2018: Brain Research
Rita Catia Brás Bariani, Carlos Henrique Guimarães, Wilana Silva Moura, Cristina Lucia Feijó Ortolani, Josß Fernando Castanha Henriques, Silvio Augusto Pereira-Bellini
Treatments without tooth extractions have become more popular over the last two decades. In this context, expansion of the maxillary arch is an interesting treatment option for cases in which space is required and other factors not favoring extractions (such as the facial profile) are present. According to several authors, this posterior expansion can be obtained using a system comprising self-ligating brackets and superelastic nickel-titanium arches. The present article aims to report a case of a young patient with Class II, Division 2 malocclusion, with impacted upper canines and significant arch length-tooth discrepancy...
May 2018: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
Ahmed Mohamed Abohabib, Mona Mohamed Fayed, Amr H Labib
OBJECTIVE: To investigate the effect of low-intensity laser therapy on mini-implant stability using resonance frequency analysis during canine retraction with fixed appliances. DESIGN: A split-mouth randomised clinical trial. SETTING: Subjects were recruited and treated in the outpatient clinic, Department of Orthodontics, Faculty of Dentistry, Cairo University. PARTICIPANTS: Fifteen subjects with mean age 20.9 (±3...
June 6, 2018: Journal of Orthodontics
Sarabjeet Kour Sudan, Narender Kumar, Ishwinder Kaur, Girish Sahni
Alpha-amylase is an important hydrolytic enzyme used for various industrial processes. In the present study, Geobacillus bacterium (K1C), producing a thermostable α-amylase was isolated from Manikaran hot springs, India. We have purified and characterized the biochemical properties of α-amylase. The optimum temperature and pH for α-amylase activity was 80 °C and pH 6.0 respectively. The far-UV CD spectra of the enzyme indicated the presence of random coil conformation and showed an intermediate phase during temperature-induced unfolding...
October 1, 2018: International Journal of Biological Macromolecules
N Odagaki, Y Ishihara, Z Wang, E Ei Hsu Hlaing, M Nakamura, M Hoshijima, S Hayano, N Kawanabe, H Kamioka
Sclerostin (Scl) negatively regulates bone formation and favors bone resorption. Osteocytes, the cells responsible for mechanosensing, are known as the primary source of Scl and are a key regulator of bone remodeling through the induction of receptor activator of NF-κB ligand (RANKL). However, the spatiotemporal patterns of Scl in response to mechanical stimuli and their regulatory mechanisms remain unknown. We investigated the regulatory dynamics of the SOST/Scl expression generated by orthodontic tooth movement (OTM) in vivo and in vitro...
June 1, 2018: Journal of Dental Research
Anvar S Baimuratov, Tatiana P Pereziabova, Mikhail Yu Leonov, Weiren Zhu, Alexander V Baranov, Anatoly V Fedorov, Yurii K Gun'ko, Ivan D Rukhlenko
The search for the optimal geometry of optically active semiconductor nanostructures is making steady progress and has far-reaching benefits. Yet the helical springlike shape, which is very likely to provide a highly dissymmetric optical response, remains somewhat understudied theoretically. Here we comprehensively analyze the optical activity of semiconductor nanosprings using a fully quantum-mechanical model of their electronic subsystem and taking into account the anisotropy of their interaction with light...
June 4, 2018: ACS Nano
V Quinzi, R Ferro, F A Rizzo, E M Marranzini, F Federici Canova, S Mummolo, A Mattei, G Marzo
AIM: The aim of the study was to investigate how widespread is the use of the 2 x 4 appliance among Italian general dentists and specialists in orthodontics, as well as the type of treatment employed and length of use. MATERIALS AND METHODS: We conducted a nationwide cross-sectional survey from July 14, 2016 to January 12, 2017 using an online questionnaire of 8 multiple choice questions, created by the SurveyMonkey® Company, on a population of Italian dentists and specialists in orthodontics affiliated with the Italian Society of Paediatric Dentistry (SIOI)...
June 2018: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
James L Martin, Robert Ishmukhametov, David Spetzler, Tassilo Hornung, Wayne D Frasch
The angular velocity profile of the 120° F1 -ATPase power stroke was resolved as a function of temperature from 16.3 to 44.6 °C using a ΔμATP = -31.25 k B T at a time resolution of 10 μs. Angular velocities during the first 60° of the power stroke (phase 1) varied inversely with temperature, resulting in negative activation energies with a parabolic dependence. This is direct evidence that phase 1 rotation derives from elastic energy (spring constant, κ = 50 k B T ·rad-2 ). Phase 2 of the power stroke had an enthalpic component indicating that additional energy input occurred to enable the γ-subunit to overcome energy stored by the spring after rotating beyond its 34° equilibrium position...
May 29, 2018: Proceedings of the National Academy of Sciences of the United States of America
Kriangkrai Kraiwattanapong, Bancha Samruajbenjakun
OBJECTIVES: To investigate the effects of light and heavy forces with corticotomy on tooth movement rate, alveolar bone response, and root resorption in a rat model. MATERIALS AND METHODS: The right and left sides of 40 male Wistar rats were randomly assigned using the split-mouth design to two groups: light force with corticotomy (LF) and heavy force with corticotomy (HF). Tooth movement was performed on the maxillary first molars using a nickel-titanium closed-coil spring delivering either 10 g (light force) or 50 g (heavy force)...
May 1, 2018: Angle Orthodontist
H S Lee, H A Heo, S H Park, W Lee, S W Pyo
OBJECTIVE: To investigate the effects of parathyroid hormone (PTH) on tooth movement in ovariectomized (OVX) rats by comparing the tooth movement distance and relapse and by examining the alveolar bone microstructure. MATERIALS AND METHODS: Thirty 8-week-old female rats were classified into 3 groups: sham-operated, OVX and ovariectomized rats injected with PTH (PTH). Eight weeks later, a closed-coil spring appliance was placed between the maxillary incisor and the first molar and then activated with 50 cN of force...
April 19, 2018: Orthodontics & Craniofacial Research
Airi Ino-Kondo, Hitoshi Hotokezaka, Takanobu Kondo, Keira Arizono, Megumi Hashimoto, Yuka Hotokezaka, Takeshi Kurohama, Yukiko Morita, Noriaki Yoshida
OBJECTIVE: To investigate the influence of lithium chloride (LiCl) on orthodontic tooth movement (OTM), orthodontically induced root resorption (OIRR), and bone morphometry. MATERIALS AND METHODS: Ten-week-old female Sprague Dawley rats (n = 32) were divided into four groups based on the concentration of LiCl administered daily per kilogram body weight: 0 (control group), 0.32, 0.64, and 1.28 mM/kg body weight. The maxillary left first molars were moved mesially by a 10 cN coil spring for 14 days...
July 2018: Angle Orthodontist
Sanjeev Verma, Nameksh Raj Bhupali, Deepak Kumar Gupta, Sombir Singh, Satinder Pal Singh
Space gaining is frequently required in orthodontics. Multiple loops were initially used for space gaining and alignment. The most common used mechanics for space gaining is the use of nickel-titanium open coil springs. The disadvantage of nickel-titanium coil spring is that they cannot be used until the arches are well aligned to receive the stiffer stainless steel wires. Therefore, a new method of gaining space during initial alignment and leveling has been developed and named as sleeve push technique (SPT)...
January 2018: Contemporary Clinical Dentistry
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