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Kuwajima Y, Ishida Y, Lee C, Mayama H, Satoh K, Ishikawa-Nagai S. 3D digital analysis of magnetic force-driven orthodontic tooth movement. Heliyon 2019; 5:e02861. [PMID: 31844745 PMCID: PMC6895672 DOI: 10.1016/j.heliyon.2019.e02861] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 10/11/2019] [Accepted: 11/13/2019] [Indexed: 02/06/2023] Open
Abstract
With the introduction of rare earth magnets like neodymium-iron-boron (NdFeB), it has become possible to produce small magnets with high forces, necessary for its usage in the field of dentistry, such as for orthodontic tooth movement. The ultimate goal of this project is to establish magnetic force-driven orthodontic treatment as a future treatment modality for comprehensive orthodontic treatment. In order to utilize magnets for orthodontic treatment, we must first understand the characteristics of tooth movement created by magnetic forces. In this study, we aimed to digitally assess the efficacy of magnetic attraction and repulsion forces by means of a 3D digital analysis of movement (distance, direction, angulation and duration) and rotation (yaw, pitch and roll) of the crown and root of teeth in an ex vivo typodont model. We performed space closure and space gain treatment of maxillary central incisors (n = 30) and analyzed the movement and rotation of the teeth and root apex with 3D digital analysis. The results of the typodont model indicated significant differences on amount, speed and rotation of tooth and root movement created by magnetic attraction and repulsion forces. We also mimicked a moderate crowding typodont case and successfully treated it with a combination of attraction and repulsion magnetic forces. The moderate crowding case utilized magnets and a titanium archwire to guide the planned tooth movements and prevent undesired or unexpected movement. Further ex vivo experiments and considerations for biosafety will be necessary to investigate magnet force-driven orthodontics as a future modality of orthodontic treatment.
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Affiliation(s)
- Yukinori Kuwajima
- Department of Oral Medicine, Immunity and Infection, Harvard School of Dental Medicine, Boston, MA, USA
| | - Yoshiki Ishida
- Department of Oral Medicine, Immunity and Infection, Harvard School of Dental Medicine, Boston, MA, USA
| | - Cliff Lee
- Department of Oral Medicine, Immunity and Infection, Harvard School of Dental Medicine, Boston, MA, USA
- Department of Orofacial Sciences, University of California, San Francisco School of Dentistry, CA, USA
| | - Hisayo Mayama
- Division of Orthodontics, Department of Developmental Oral Health Science, School of Dentistry, Iwate Medical University, Morioka, Iwate, Japan
| | - Kazuro Satoh
- Division of Orthodontics, Department of Developmental Oral Health Science, School of Dentistry, Iwate Medical University, Morioka, Iwate, Japan
| | - Shigemi Ishikawa-Nagai
- Department of Oral Medicine, Immunity and Infection, Harvard School of Dental Medicine, Boston, MA, USA
- Corresponding author.
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Wu Z, Ding X, Lei G, Zeng C, Wei J, Li J, Li H, Yang T, Cui Y, Xiong Y, Wang Y, Xie D. Efficacy and safety of the pulsed electromagnetic field in osteoarthritis: a meta-analysis. BMJ Open 2018; 8:e022879. [PMID: 30552258 PMCID: PMC6303578 DOI: 10.1136/bmjopen-2018-022879] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2018] [Revised: 07/21/2018] [Accepted: 10/19/2018] [Indexed: 12/20/2022] Open
Abstract
OBJECTIVE To investigate the efficacy and safety of the pulsed electromagnetic field (PEMF) therapy in treating osteoarthritis (OA). DESIGN Meta-analysis. DATA SOURCES PubMed, Embase, the Cochrane Library and Web of Science were searched through 13 October 2017. ELIGIBILITY CRITERIA FOR SELECTING STUDIES Randomised controlled trials compared the efficacy of PEMF therapy with sham control in patients with OA. DATA EXTRACTION AND SYNTHESIS Pain, function, adverse effects and characteristics of participants were extracted. RevMan V.5.2 was used to perform statistical analyses. RESULTS Twelve trials were included, among which ten trials involved knee OA, two involved cervical OA and one involved hand OA. The PEMF group showed more significant pain alleviation than the sham group in knee OA (standardised mean differences (SMD)=-0.54, 95% CI -1.04 to -0.04, p=0.03) and hand OA (SMD=-2.85, 95% CI -3.65 to -2.04, p<0.00001), but not in cervical OA. Similarly, comparing with the sham-control treatment, significant function improvement was observed in the PEMF group in both knee and hand OA patients (SMD=-0.34, 95% CI -0.53 to -0.14, p=0.0006, and SMD=-1.49, 95% CI -2.12 to -0.86, p<0.00001, respectively), but not in patients with cervical OA. Sensitivity analyses suggested that the exposure duration <=30 min per session exhibited better effects compared with the exposure duration >30 min per session. Three trials reported adverse events, and the combined results showed that there was no significant difference between PEMF and the sham group. CONCLUSIONS PEMF could alleviate pain and improve physical function for patients with knee and hand OA, but not for patients with cervical OA. Meanwhile, a short PEMF treatment duration (within 30 min) may achieve more favourable efficacy. However, given the limited number of study available in hand and cervical OA, the implication of this conclusion should be cautious for hand and cervical OA.
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Affiliation(s)
- Ziying Wu
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
| | - Xiang Ding
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
| | - Guanghua Lei
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
| | - Chao Zeng
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
| | - Jie Wei
- Department of Health Management Center, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, Hunan Province, China
| | - Jiatian Li
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
| | - Hui Li
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
| | - Tuo Yang
- Department of Health Management Center, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
| | - Yang Cui
- International Medical Department, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
| | - Yilin Xiong
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
| | - Yilun Wang
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
| | - Dongxing Xie
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
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Kamm K, Pomschar A, Ruscheweyh R, Straube A, Reiser MF, Hernádi I, László JF, Ertl-Wagner B. Static magnetic field exposure in 1.5 and 3 Tesla MR scanners does not influence pain and touch perception in healthy volunteers. Eur J Pain 2018; 23:250-259. [DOI: 10.1002/ejp.1299] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 07/25/2018] [Accepted: 07/29/2018] [Indexed: 11/05/2022]
Affiliation(s)
- Katharina Kamm
- Department of Neurology; Ludwig-Maximilians-University Hospital; Munich Germany
| | - Andreas Pomschar
- Department of Radiology; Ludwig-Maximilians-University Hospital; Munich Germany
| | - Ruth Ruscheweyh
- Department of Neurology; Ludwig-Maximilians-University Hospital; Munich Germany
| | - Andreas Straube
- Department of Neurology; Ludwig-Maximilians-University Hospital; Munich Germany
| | | | - Istvan Hernádi
- Center for Neuroscience; Department of Experimental Neurobiology and Szentagothai Research Center; University of Pécs; Pécs Hungary
| | - Janos F. László
- Department of Computer Science; University of Debrecen; Debrecen Hungary
| | - Birgit Ertl-Wagner
- Department of Radiology; Ludwig-Maximilians-University Hospital; Munich Germany
- Department of Radiology; The Hospital for Sick Children; University of Toronto; Toronto Canada
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Szemerszky R, Szabolcs Z, Bogdány T, Jánossy G, Thuróczy G, Köteles F. No effect of a pulsed magnetic field on induced ischemic muscle pain. A double-blind, randomized, placebo-controlled trial. Physiol Behav 2018; 184:55-59. [PMID: 29127072 DOI: 10.1016/j.physbeh.2017.11.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Revised: 10/30/2017] [Accepted: 11/06/2017] [Indexed: 10/18/2022]
Abstract
Empirical evidence supporting the effectiveness of pulsed (electro)magnetic field (PEMF) therapy on chronic and acute pain is equivocal. In the current randomized, double-blind, placebo-controlled experiment, impact of a commercially available whole-body PEMF mat on acute ischemic muscle pain induced in the forearm was studied with the participation of 70 healthy volunteers. The device emitted a pulsed magnetic field with a repetition frequency of 2.05Hz and a maximum flux density of 25.3μT (rms). The highest dB/dt was 48mT/s. No differences between the groups receiving actual and sham PEMF were found in terms of pain threshold, pain tolerance, heart rate, and perceived decrease of pain. However, participants' expectation concerning the effectiveness of the intervention improved pain tolerance and affected perceived change of pain. In conclusion, the used PEMF device had no specific effect on acute ischemic muscle pain, while the contribution of the placebo effect was considerable.
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Affiliation(s)
- Renáta Szemerszky
- Institute of Health Promotion and Sport Sciences, ELTE Eötvös Loránd University, Bogdánfy u. 10/B, Budapest H-1117, Hungary.
| | - Zsuzsanna Szabolcs
- Institute of Health Promotion and Sport Sciences, ELTE Eötvös Loránd University, Bogdánfy u. 10/B, Budapest H-1117, Hungary; Doctoral School of Psychology, Institute of Psychology, ELTE Eötvös Loránd University, Izabella u. 46, H-1064 Budapest, Hungary
| | - Tamás Bogdány
- Institute of Health Promotion and Sport Sciences, ELTE Eötvös Loránd University, Bogdánfy u. 10/B, Budapest H-1117, Hungary
| | - Gábor Jánossy
- National Public Health Institute, Department of Non-Ionizing Radiation, Anna u. 5., H-1221 Budapest, Hungary.
| | - György Thuróczy
- National Public Health Institute, Department of Non-Ionizing Radiation, Anna u. 5., H-1221 Budapest, Hungary.
| | - Ferenc Köteles
- Institute of Health Promotion and Sport Sciences, ELTE Eötvös Loránd University, Bogdánfy u. 10/B, Budapest H-1117, Hungary.
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Zhu Y, Wang S, Long H, Zhu J, Jian F, Ye N, Lai W. Effect of static magnetic field on pain level and expression of P2X3 receptors in the trigeminal ganglion in mice following experimental tooth movement. Bioelectromagnetics 2016; 38:22-30. [PMID: 27770441 DOI: 10.1002/bem.22009] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 09/10/2016] [Indexed: 02/05/2023]
Affiliation(s)
- Yafen Zhu
- Department of Orthodontics; State Key Laboratory of Oral Diseases; West China Hospital of Stomatology; Sichuan University; Chengdu China
| | - Shengguo Wang
- Department of Stomatology; Second Affiliated Hospital; Chongqing Medical University; Chongqing China
| | - Hu Long
- Department of Orthodontics; State Key Laboratory of Oral Diseases; West China Hospital of Stomatology; Sichuan University; Chengdu China
| | - Jingyi Zhu
- Department of Orthodontics; State Key Laboratory of Oral Diseases; West China Hospital of Stomatology; Sichuan University; Chengdu China
| | - Fan Jian
- Department of Orthodontics; State Key Laboratory of Oral Diseases; West China Hospital of Stomatology; Sichuan University; Chengdu China
| | - Niansong Ye
- Department of Orthodontics; Ninth People's Hospital; Shanghai Jiao Tong University; Shanghai China
| | - Wenli Lai
- Department of Orthodontics; State Key Laboratory of Oral Diseases; West China Hospital of Stomatology; Sichuan University; Chengdu China
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