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orthodontic miniscrew

Hyo-Jin Park, Sung-Hwan Choi, Yoon Jeong Choi, Young-Bum Park, Kwang-Mahn Kim, Hyung-Seog Yu
OBJECTIVES: To determine whether the success rate and primary stability of surface-treated miniscrews differ from those of nontreated miniscrews. MATERIALS AND METHODS: Patients who required one or more miniscrews for the same reason in each quadrant were recruited into a single-blinded, split-mouth, randomized, controlled trial with a 1:1 allocation ratio. Self-drilling miniscrews with two surface types were used: those with no surface treatment, and those with an acid-etched surface treatment...
December 5, 2018: Angle Orthodontist
Xiao-Qing Ma, Fei Xiang, Fei Qin, Wen-Hao Qian
PURPOSE: To study the clinical effect of double miniscrews for extraction of horizontally impacted wisdom tooth adjacent to the inferior alveolar nerve canal. METHODS: Eight horizontally impacted wisdom teeth requiring extraction because of orthodontic treatment were proven to be adjacent to the inferior alveolar nerve canal by means of cone-beam CT scan. The treatment began with double miniscrews traction under the help of cantilever beam. After 6~9 months, they left the canal and then were extracted...
August 2018: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
Carine Bourassa, Yara K Hosein, Steven I Pollmann, Khadry Galil, Richard N Bohay, David W Holdsworth, Ali Tassi
INTRODUCTION: This experiment was undertaken to assess the primary stability of orthodontic miniscrews inserted at different sites in human cadaveric palatal bone for temporary skeletal anchorage, and to determine the effect of bone quality and quantity on their primary stability using microcomputed tomography imaging. METHODS: A total of 10 cadaveric maxillary hard palates were used for insertion of 130 orthodontic miniscrews (VectorTAS; Ormco, Orange, Calif; length, 6 mm; diameter, 1...
December 2018: American Journal of Orthodontics and Dentofacial Orthopedics
Niels Ganzer, Ingalill Feldmann, Lars Bondemark
INTRODUCTION: Anchorage can be reinforced in many ways. Due to the variety of anchorage concepts, only a few general conclusions can be drawn. Therefore, more research is needed to investigate specific concepts with specific indications. The objective of this trial was to compare the anchorage capacities of miniscrews and molar blocks. METHODS: This randomized controlled trial was conducted on 2 parallel arms. The trial was conducted at the Public Dental Service Orthodontic Clinic in Gävle, Sweden...
December 2018: American Journal of Orthodontics and Dentofacial Orthopedics
Fahad Alharbi, Mohammed Almuzian, David Bearn
BACKGROUND: Anchorage in orthodontics can be provided through several extra- and intra-oral sources including headgear, teeth, cortical bone and soft tissue. OBJECTIVE: The aim of this review was to systematically review the effectiveness of miniscrews in reinforcing anchorage during en-masse retraction of anterior teeth in comparison to conventional anchorage appliances. Search method: Comprehensive searching of the electronic databases was undertaken up to March 2018 in the Cochrane Database of Systematic review, Cochrane Central Register of Controlled Trials, MEDLINE via PubMed and Scopus databases...
October 23, 2018: Acta Odontologica Scandinavica
Anastasia Bakopoulou, Peter Hoang, Ali Fathi, Matthew Foley, Colin Dunstan, Oyku Dalci, Alexandra K Papadopoulou, M Ali Darendeliler
Objective: The aim of this study was to assess the potential of improving orthodontic miniscrews' (MSs) primary stability in vivo by evaluating the dispersion capacity of an injectable bone graft substitute (iBGS) through a newly designed hollow MS [The Sydney Mini Screw (SMS)] and its integration with the cortical and trabecular bone by using the femur and tibia in a New Zealand rabbit animal model. Methods: In total, 24 MSs were randomly placed in each proximal tibia and femur of 6 New Zealand rabbits with an open surgery process...
October 12, 2018: European Journal of Orthodontics
Hisham Mohammed, Khaled Wafaie, Mumen Z Rizk, Mohammed Almuzian, Rami Sosly, David R Bearn
OBJECTIVES: The aim of this review was to systematically evaluate the failure rates of miniscrews related to their specific insertion site and explore the insertion site dependent risk factors contributing to their failure. SEARCH METHODS: An electronic search was conducted in the Cochrane Central Register of Controlled Trials (CENTRAL), Web of Knowledge, Scopus, MEDLINE and PubMed up to October 2017. A comprehensive manual search was also performed. ELIGIBILITY CRITERIA: Randomised clinical trials and prospective non-randomised studies, reporting a minimum of 20 inserted miniscrews in a specific insertion site and reporting the miniscrews' failure rate in that insertion site, were included...
September 24, 2018: Progress in Orthodontics
Mhd Hassan Albogha, Ichiro Takahashi
OBJECTIVES: To describe the relationship between the proximity of miniscrew implants (MSIs) to the periodontal ligament (PDL) and stress in the PDL under different load magnitudes and different bone properties. MATERIALS AND METHODS: Sixteen subject-specific finite element models of the region of the maxillary first molar and second premolar were developed using computed tomography images of four patients. For each patient, an MSI surface model derived from micro-computed tomography was placed at four different distances from the premolar PDL...
September 19, 2018: Angle Orthodontist
O I Arsenina, V E Kozachenko, A G Nadtochiy, M Y Fomin, N V Popova
Process of the mesialization of molars in the lower jaw is long-time, moreover the molars are not frequently bodily translation. Conduction of the corticotomy reduce to regional acceleration phenomen that permit to accelerate the tooth movement avoiding negative inclination. PURPOSE: To improve the effectiveness of the treatment using piezocorticotomy and miniscrew anchorage approach in cases of third and second molar mesialization when first molar is missing. MATERIAL AND METHODS: 24 patients (10 men/14 women) aged 25-40 years with a fixed vestibular braces and the absence of molars on the lower jaw...
2018: Stomatologii︠a︡
Marcelo K Suzuki, Danielle Ar Martins, Marília T Costa, Andreia C Ferreira, Flavio Ac Ferreira
AIM: To evaluate, in vitro, the mini-implant surface changes and the release of ions after immersion in artificial saliva during follow-up of 60 and 120 days. MATERIALS AND METHODS: As for the surface features, examined in a scanning electron microscope (SEM), before and after immersion in artificial saliva, there was a rough and uneven surface, suggestive of corrosion areas for the two trademarks evaluated after 120 days of immersion. The extracts generated in artificial saliva analysis were submitted to energy dispersive spectroscopy to identify the solid corrosion products produced on the surfaces of miniscrews...
August 1, 2018: Journal of Contemporary Dental Practice
Mihri Amasyalı, Fidan Alakuş Sabuncuoğlu, Uğur Oflaz
The aim of the present study was to evaluate the effects of the miniscrew-supported, modified Hyrax appliance on bilateral distalization of posterior teeth. A 15-year-old girl with Class II malocclusion (end-to-end molar relationships, space deficiency for maxillary canine) underwent orthodontic treatment. The patient rejected tooth extraction. Then, she was treated with the miniscrew-supported, modified Hyrax appliance. An activation of 1 mm per month was planned. Lateral cephalometric views were used to evaluate distal movement...
March 2018: Turkish journal of orthodontics
Masahiro Nakamura, Noriaki Kawanabe, Rie Adachi, Takashi Yamashiro, Hiroshi Kamioka
This report illustrates successful nonsurgical orthodontic treatment of a hypodivergent adult patient with bilateral posterior scissors bite (Brodie bite) and excessive overjet. A 26-year-old woman primarily reported maxillary incisor protrusion. She was diagnosed with Class ll division 1 malocclusion with skeletal Class I, short face, low mandibular plane angle and bilateral posterior scissors bite. A lingual arch with anterior bite block and posterior miniscrews with preadjusted edgewise appliances were used to improve the bilateral scissors bite...
August 6, 2018: Angle Orthodontist
Joana Eg Yépez, Renata M Marangon, Armando Y Saga, Key F de Lima, Orlando M Tanaka
AIM: The aim of this study was to use the finite-element method (FEM) to analyze the stress fields generated in miniscrews (MSs) and surrounding bone on applying a force perpendicular to the MS according to variations in the cortical bone thickness and changes in the transmucosal profile length and MS composition. MATERIALS AND METHODS: Miniscrews with stainless steel (SS) and titanium alloy mechanical properties with a 1 to 2 mm transmucosal profile inserted in bone blocks with cortical bone of varying thickness (1 and 2 mm) were three-dimensionally modeled using computer-aided design (CAD) and examined using FEM...
July 1, 2018: Journal of Contemporary Dental Practice
Maria Francesca Sfondrini, Paola Gandini, Roberto Alcozer, Pekka K Vallittu, Andrea Scribante
Miniscrews have been introduced in orthodontics as temporary anchorage devices (TADs), in order to move the correct teeth and avoid other elements to slide toward a wrong direction. Moreover the ease of use of TADs encouraged clinicians to use miniscrews also for non-conventional purposes, as fixation in mandibular fracture, mini-implant supported temporary pontics, miniscrew-assisted rapid palatal expanders and distalizers. These applications develop higher forces, so TAD fracture can be an unwanted complication...
November 2018: Journal of the Mechanical Behavior of Biomedical Materials
Hannah Finke, Bernd Koos, Helge Fischer-Brandies, Martha Es-Souni
PURPOSE: Miniscrews are an important choice for orthodontic anchorage. Yet reports on failures do exist, and attempts have been made to elucidate the causes. Clinical outcomes may be compromised not only by the mechanical implications of miniscrew design and the location of anchorage but also by poor biocompatibility. Hence, this study deals with the surface roughness and elemental composition of miniscrews and how these properties may affect the in vitro biocompatibility of four commercially available miniscrews...
September 2018: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
Andrea Scribante, Mona A Montasser, Eman Saad Radwan, Luisa Bernardinelli, Roberto Alcozer, Paola Gandini, Maria Francesca Sfondrini
Temporary anchorage devices (TADs) have been introduced into orthodontic clinical practice in order to allow tooth movements while avoiding strain on adjacent teeth. Miniscrews are available in the market with different diameters and materials. Accordingly, the purpose of the present report was to measure and compare the forces to bend and fracture different mini implants. Ti-6Al-4V titanium and stainless steel TADs of different manufacturers (Spider ScrewHDC; Mini Implants⁻Leone; Benefit⁻Orteam; Storm⁻Kristal) were evaluated...
July 5, 2018: Materials
Kavitha Odathurai Marusamy, Saravanan Ramasamy, Othman Wali
Early loss of permanent teeth, congenitally missing lateral incisors or second premolars, extremely displaced or impacted canines, all result in a reduced upper dentition. That leads to the development of crossbite in the maxillary dentition. Partial denture prosthesis, dental implants, and space closure by fixed orthodontics are the various means of treating the edentulous spaces. Protraction of molars is time taking and challenging. Temporary anchorage device (TAD) helps to protract molars without anchorage loss...
May 2018: Journal of International Society of Preventive & Community Dentistry
Mari Miura Sugii, Bruno de Castro Ferreira Barreto, Waldemir Francisco Vieira-Júnior, Katia Regina Izola Simone, Ataís Bacchi, Ricardo Armini Caldas
OBJECTIVE: The aim of his study was to evaluate the stress on tooth and alveolar bone caused by orthodontic intrusion forces in a supraerupted upper molar, by using a three-dimensional Finite Element Method (FEM). METHODS: A superior maxillary segment was modeled in the software SolidWorks 2010 (SolidWorks Corporation, Waltham, MA, USA) containing: cortical and cancellous bone, supraerupted first molar, periodontal tissue and orthodontic components. A finite element model has simulated intrusion forces of 4N onto a tooth, directed to different mini-screw locations...
January 2018: Dental Press Journal of Orthodontics
Aldo Otazú Cambiano, Guilherme Janson, Diego Coelho Lorenzoni, Daniela Gamba Garib, Dino Torres Dávalos
OBJECTIVES: A skeletal anterior open-bite is a challenging malocclusion for the orthodontist due to the difficulty and instability of correction. Treatment options for the adult patient include extractions, anterior extrusion with intermaxillary elastics, posterior intrusion using skeletal anchorage, occlusal adjustment, and orthognathic surgery. Patient compliance plays a key role in posttreatment stability. The present case report demonstrates the orthodontic treatment of an adult patient who presented with a complex open-bite malocclusion...
2018: Journal of Orthodontic Science
J Meyns, D M Brasil, J F Mazzi-Chaves, C Politis, R Jacobs
A systematic review of the literature was performed regarding the clinical outcome (effectiveness) of bone anchorage devices in interceptive treatment for class III malocclusion. A search of Embase, PubMed and Web of Science databases yielded 285 papers. An additional two articles were retrieved through manual searching of the reference lists. After initial abstract selection, 32 potentially eligible articles were screened in detail, resulting in a final number of eight articles included in this review. Insufficient evidence was found regarding the effects of skeletal anchorage in interceptive class III treatment to support definitive conclusions on long-term skeletal effects and stability...
August 2018: International Journal of Oral and Maxillofacial Surgery
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