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orthodontic miniscrew

Sang-Woon Ha, Jin-Young Choi, Seung-Hak Baek
A 29-year-old female patient with unilateral condylar hyperplasia (UCH) of the left side presented with facial asymmetry, maxillary transverse occlusal plane (MXTOP) cant, posterior open bite, and Class III relationship. Treatment consisted of proportional condylectomy of the left condyle for management of UCH, and fixed orthodontic treatment with intrusion of the left maxillary molars to correct the MXTOP cant and remaining chin point deviation (CPD). Proportional condylectomy with a 14-mm resection of the left condylar head improved the CPD from 11...
February 11, 2019: Angle Orthodontist
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
Mucahid Yildirim, Mehmet Akin
INTRODUCTION: Root resorption was compared between bone-borne and tooth tissue-borne rapid maxillary expansion patients with the use of microtomography. METHODS: The study included 20 patients (ages 11-16 years) requiring fixed orthodontic treatment who underwent extraction of their first premolars after rapid maxillary expansion with the use of modified appliances. One side of the appliance covered the teeth with acrylic, while the other side was fixed to the palatal bone by means of a miniscrew...
February 2019: American Journal of Orthodontics and Dentofacial Orthopedics
Sung-Jin Kim, Young Don Ha, Eunji Kim, Woowon Jang, Soonshin Hwang, Tung Nguyen, Ching-Chang Ko, Yoon Jeong Choi, Kyung-Ho Kim, Chooryung J Chung
OBJECTIVE: The aim of this study was to investigate the dynamics of alveolar bone formation and healing pattern after the removal of orthodontic temporary anchorage devices (TADs). METHODS: Miniscrews (N = 32) were inserted into the buccal inter-radicular alveolar bone in beagle dogs. Afterward, miniscrews were removed at different time points during a 13-week period and six different in vivo fluorescent markers were injected at 1, 2, 6, 8, 10, and 12 weeks. Serial changes in bone apposition at the removal and intact control sites were evaluated using μCT, histology, and bone histomorphometry...
January 24, 2019: Journal of Periodontal Research
Jun Kawamura, Naohiko Tamaya
BACKGROUND: Sliding mechanics with miniscrews is recently used for extraction space closure. The purpose of this study was to elucidate how and why the archwire size affects long-term tooth movement in miniscrew sliding mechanics. METHODS: Long-term orthodontic tooth movements were simulated based on a remodeling law of the alveolar bone by using a finite element method, in which the bracket rotated freely within a clearance gap (a play) of the archwire-bracket slot...
January 21, 2019: Progress in Orthodontics
Sasha Pervin, Sarah Rolland, Greig Taylor
Data sourcesMedline, Scopus, Web of Science, PubMed and the Cochrane Central Register of controlled Trials (CENTRAL). Handsearching of references lists of included studies.Study selectionRandomised controlled clinical trials (RCTs) and prospective controlled clinical trials (pCCTs) of orthodontic patients treated with pre-adjusted fixed appliances, requiring space closure in the maxillary arch, comparing en masse retraction and two-step retraction. No initial restriction on language or date of publication. Retrospective studies were excluded...
December 2018: Evidence-based Dentistry
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
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