24 results match your criteria miniscrew mobility

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Evaluation of success rate and biomechanical stability of ultraviolet-photofunctionalized miniscrews with short lengths.

Am J Orthod Dentofacial Orthop 2021 Feb 24;159(2):158-166. Epub 2020 Nov 24.

Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry, Seoul, South Korea. Electronic address:

Introduction: The aim of this research was to verify that ultraviolet light (UV)-photofunctionalization improves the success rate and biomechanical stability of miniscrews regardless of length, and to evaluate the comparability of biomechanical stability between UV-photofunctionalized miniscrews with short lengths and untreated miniscrews with conventional lengths.

Methods: Eight male beagles (age, 12-15 months; weight, 10-13 kg) received a total of 64 miniscrews, including 7-mm and 4-mm untreated and UV-photofunctionalized, acid-etched miniscrews with the use of a random block design. The cumulative success rates were examined in all studied groups. Read More

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February 2021

A comparative assessment of orthodontic treatment outcomes of mild skeletal Class III malocclusion between facemask and facemask in combination with a miniscrew for anchorage in growing patients: .

Angle Orthod 2020 01 12;90(1):3-12. Epub 2019 Aug 12.

Objectives: To investigate the hypothesis that there is difference in the treatment outcomes of milder skeletal Class III malocclusion between facemask and facemask in combination with a miniscrew in growing patients.

Materials And Methods: Patients were randomly divided into two groups. In one group, the patients were treated with facemask therapy (FM group: 12 males, eight females, average age: 10 years, 5 months ± 1 year, 8 months). Read More

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January 2020

Insertion torque and Periotest values are important factors predicting outcome after orthodontic miniscrew placement.

Am J Orthod Dentofacial Orthop 2017 Oct;152(4):483-488

Department of Orthodontics, School of Dentistry, Aichi Gakuin University, Nagoya, Japan.

Introduction: Approximately 14% of orthodontic anchor screws (miniscrews) become dislodged regardless of the accuracy of placement. It is therefore important to investigate the factors causing dislodgement. We evaluated the stability of miniscrews after placement to identify factors influencing outcome in orthodontic treatment using miniscrews. Read More

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October 2017

Assessment of stability of orthodontic mini-implants under orthodontic loading: A computed tomography study.

Indian J Dent Res 2015 May-Jun;26(3):237-43

Department of Orthodontics and Dentofacial Orthopedics, Pacific Dental College and Hospital, Debari, Udaipur, Rajasthan, India.

Objectives: Miniscrews have been used in recent years for anchorage in orthodontic treatment. However, it is not clear whether the miniscrews are absolutely stationary or move when force is applied. This prospective clinical study was undertaken to evaluate the mobility of orthodontic miniscrews under orthodontic loading using computed tomography. Read More

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February 2017

Maxillary sinus perforation by orthodontic anchor screws.

J Oral Sci 2015 Jun;57(2):95-100

Department of Orthodontics, Nihon University School of Dentistry.

To facilitate safe placement of orthodontic anchor screws (miniscrews), we investigated the frequency of maxillary sinus perforation after screw placement and the effect of sinus perforation on screw stability. Maxillary sinus perforations involving 82 miniscrews (diameter, 1.6 mm; length, 8 mm) were evaluated using cone-beam computed tomography. Read More

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A study of interleukin 1β levels in peri-miniscrew crevicular fluid (PMCF).

Prog Orthod 2014 Apr 1;15(1):30. Epub 2014 Apr 1.

Division of Orthodontics and Dentofacial Deformities, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi 110029, India.

Background: This study provides a vital insight in assessing the clinical and biochemical changes in interleukin (IL)-1β levels in peri-miniscrew crevicular fluid (PMCF) during the course of orthodontic tooth movement.

Methods: The study comprised the analysis of IL-1β in peri-miniscrew crevicular fluid obtained from crevices around the miniscrews inserted in 11 patients (eight females and three males, mean age 17.3 ± 4. Read More

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Lateral transmalleolar approach and miniscrews fixation for displaced posterolateral fragments of posterior malleolus fractures in adults: a consecutive study.

J Orthop Trauma 2015 Feb;29(2):105-9

Department of Orthopaedic Surgery, Seoul National University Hospital, Seoul, South Korea.

Objectives: To evaluate the lateral transmalleolar (LTM) approach for a displaced posterolateral fragments of a posterior malleolus fracture.

Design: Prospective, consecutive.

Setting: Level 1 trauma center. Read More

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February 2015

A preliminary study of the effects of low-intensity pulsed ultrasound exposure on the stability of orthodontic miniscrews in growing rats.

Eur J Orthod 2014 Aug 23;36(4):419-24. Epub 2013 Sep 23.

Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan.

Background: Orthodontic miniscrews placed in growing subjects often loosen during orthodontic treatment. The ability to place miniscrews, regardless of age, would be clinically beneficial.

Objectives: To assess the effects of low-intensity pulsed ultrasound (LIPUS) on the stability of orthodontic miniscrews in growing rats. Read More

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The use of miniscrew as orthodontic anchorage in correction of maxillary protrusion with occlusal cant, spaced arch, and midline deviation without surgery.

Orthodontics (Chic.) 2013 ;14(1):e156-67

Division of Orthodontics, Tohoku University Graduate School of Dentistry, Sendai, Japan.

This report describes the use of the miniscrew as orthodontic anchorage in maxillary protrusion with a spaced arch and midline deviation in a 16-year-old female patient. In cases with midline deviation, a cant in the maxillary occlusal plane is often observed. Thus, the authors used the miniscrew to control the vertical dimension, thereby flattening the maxillary occlusal plane, and to close and retract the incisors to improve her convex profile. Read More

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January 2014

Influence of miniscrew dental root proximity on its degree of late stability.

Int J Oral Maxillofac Surg 2013 Apr 11;42(4):527-34. Epub 2012 Oct 11.

Department of Orthodontics, Bauru Dental School, University of São Paulo, Brazil.

Purpose of this study was to evaluate the influence of miniscrew dental root proximity on its late stability degree. 40 miniscrews were inserted between maxillary second premolars and first molars for anterior retraction. Post-surgical radiographs were used to measure the septum width in the insertion site, insertion height, distal and mesial distance from miniscrew to dental root, and the smallest distance between miniscrew and dental root. Read More

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Is miniscrew primary stability influenced by bone density?

Braz Oral Res 2011 Sep-Oct;25(5):427-32

Pedodontics and Orthodontics Department, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil.

Primary stability is absence of mobility in the bone bed after mini-implant placement and depends on bone quality among other factors. Bone quality is a subjective term frequently considered as bone density. The aim of this preliminary study was to evaluate bone density in two bovine pelvic regions and verify the primary stability of miniscrews inserted into them. Read More

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January 2012

Class III malocclusion with complex problems of lateral open bite and severe crowding successfully treated with miniscrew anchorage and lingual orthodontic brackets.

Am J Orthod Dentofacial Orthop 2011 May;139(5):679-89

Department of Orthodontics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Japan.

In this article, we report the successful use of miniscrews in a patient with an Angle Class III malocclusion, lateral open bite, midline deviation, and severe crowding. Simultaneously resolving such problems with conventional Class III treatment is difficult. In this case, the treatment procedure was even more challenging because the patient preferred to have lingual brackets on the maxillary teeth. Read More

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Miniscrew stability evaluated with computerized tomography scanning.

Am J Orthod Dentofacial Orthop 2010 Jan;137(1):73-9

Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea.

Introduction: In this study, we aimed to determine the effect of bone mineral density (BMD), cortical bone thickness (CBT), screw position, and screw design on the stability of miniscrews.

Methods: Ninety-six miniscrews of both cylindrical and tapered types were placed in 6 beagle dogs. The BMD and CBT were measured by computerized tomography and correlated with the placement and removal torque and mobility. Read More

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January 2010

Chondroitin sulphate (WF6 epitope) levels in peri-miniscrew implant crevicular fluid during orthodontic loading.

Eur J Orthod 2010 Feb 13;32(1):60-5. Epub 2009 Sep 13.

Department of Orthodontics, Thailand Excellence Center for Tissue Engineering, Chiang Mai University, Thailand.

The aim of this study was to monitor changes in chondroitin sulphate (CS; WF6 epitope) levels in peri-miniscrew implant crevicular fluid (PMICF) during orthodontic loading. Ten patients (seven males and three females; aged 22.0 +/- 3. Read More

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February 2010

Correlation between miniscrew stability and bone mineral density in orthodontic patients.

Am J Orthod Dentofacial Orthop 2009 Aug;136(2):243-50

Department of Orthodontics and Pediatrics, Juiz de Fora Federal University, Juiz de Fora, Brazil.

Introduction: The aims of this study were to correlate the clinical and radiographic stability of titanium miniscrews when used as orthodontic anchorage for maxillary canine retraction and to assess bone quality.

Methods: Thirty titanium miniscrews were placed in 15 consecutive patients (8 male, 7 female; age range, 12 years 5 months-32 years 11 months) as orthodontic anchorage. Orthodontic loads were applied immediately after miniscrew placement (T1) with a nickel-titanium closing coil spring. Read More

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Factors associated with initial stability of miniscrews for orthodontic treatment.

Am J Orthod Dentofacial Orthop 2009 Aug;136(2):236-42

Department of Orthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea.

Introduction: The purpose of this study was to investigate various factors associated with initial miniscrew stability for the prediction of the success rate.

Methods: A total of 378 miniscrews in 154 patients were examined by reviewing their charts. Potential confounding variables examined were age, sex, jaw (maxilla or mandible), placement site, tissue mobility (firm or movable tissue), type, length, and diameter of the miniscrew, and the number of previous operations. Read More

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Characterization of retrieved orthodontic miniscrew implants.

Am J Orthod Dentofacial Orthop 2009 Jan;135(1):10.e1-7; discussion 10-1

Department of Orthodontics, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece.

Introduction: The purposes of this study were to characterize the morphologic, structural, and compositional alterations and to assess any hardness changes in used orthodontic miniscrew implants.

Methods: Eleven miniscrew implants (Aarhus Anchorage System, Medicon eG, Tuttlingen, Germany) placed in 5 patients were retrieved after successful service of 3.5 to 17. Read More

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January 2009

The effect of force, timing, and location on bone-to-implant contact of miniscrew implants.

Eur J Orthod 2009 Jun 10;31(3):232-40. Epub 2008 Dec 10.

Private Practice, Dallas, TX, USA.

This study was conducted to evaluate the effect of timing and force of loading, as well as implant location, on bone-to-implant contact (BIC) of loaded and control miniscrew implants (MSI). Using seven skeletally mature male beagle dogs, 1-2 years of age, followed over a 110 day period, a randomized split-mouth design compared immediate versus delayed loading, 50 versus 25 g loading, and 25 g loads in the maxilla versus the mandible. Mobility was evaluated using a 0-3 point scale before the MSIs were prepared for histological analysis. Read More

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Comparison of the loading behavior of self-drilling and predrilled miniscrews throughout orthodontic loading.

Am J Orthod Dentofacial Orthop 2008 Jan;133(1):38-43

Department of Orthodontics and Craniofacial Dentistry, Chang Gung Memorial Hospital, Taipei, Taiwan.

Introduction: A predrilled miniscrew, when used as a temporary anchorage device in the infrazygomatic crest of the maxilla, can be displaced under orthodontic loading. The purpose of this retrospective cephalometric study was to compare the loading behavior of predrilled and self-drilling miniscrews placed in the infrazygomatic crest of the maxilla.

Methods: The subjects were 32 women who had miniscrews in the infrazygomatic crest of the maxilla as skeletal anchorage for en-masse anterior retraction and intrusion; 16 had predrilled miniscrews, and 16 had the self-drilling type. Read More

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January 2008

Treatment outcomes of unstable proximal phalangeal head fractures of the finger in children.

Ann Plast Surg 2005 Jan;54(1):28-32

Division of Plastic Surgery, Hôpital Sainte-Justine, Université de Montréal, Canada.

The authors reviewed 37 children presenting with closed, unstable fractures of the proximal phalangeal head. Fractures were classified as intra-articular (n = 15), including 14 unicondylar and 1 bicondylar, or extra-articular (n = 22), including 20 subcondylar and 2 comminuted subcondylar. Eighteen patients underwent closed reduction with K-wire fixation (n = 11) or dynamic skeletal traction (n = 7). Read More

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January 2005

Do miniscrews remain stationary under orthodontic forces?

Am J Orthod Dentofacial Orthop 2004 Jul;126(1):42-7

Department of Orthodontics and Craniofacial Dentistry, Chang Gung Memorial Hospital and Graduate School of Craniofacial Medicine, Chang Gung University, 199 Tung-Hwa North Road, Taipei 105, Taiwan.

Miniscrews have been used in recent years for anchorage in orthodontic treatment. However, it is not clear whether the miniscrews are absolutely stationary or move when force is applied. Sixteen adult patients with miniscrews (diameter = 2 mm, length = 17 mm) as the maxillary anchorage were included in this study. Read More

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[Function and morphology of the temporomandibular joint after mandibular translocation osteotomies with and without positioning plates].

Mund Kiefer Gesichtschir 1998 May;2 Suppl 1:S177-82

Klinik für Mund-, Kiefer- und Gesichtschirurgie, Philipps-Universität Marburg.

Positioning devices are commonly used to avoid the malpositioning of the proximal segments in bilateral, sagittal split osteotomies and to make sure the preoperative fossa condyle relation is reproduced. The aim of our prospective study, with random selection of 24 patients, was to compare the morphological and functional outcome of the TMJs. The proximal segments in half of the patients had been positioned using devices, in the other half without devices. Read More

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[TMJ-function and -morphology after mandibular translocation-osteotomies with and without positioning plates].

Mund Kiefer Gesichtschir 1998 May;2(Suppl 1):S177-82

Klinik für Mund-, Kiefer- und Gesichtschirurgie (Prof. Dr. Dr. K. H. Austermann), Klinikum der Philipps-Universität Marburg, Marburg, Deutschland.

Positioning devices are commonly used to avoid the malpositioning of the proximal segments in bilateral, sagittal split osteotomies and to make sure the preoperative fossa condyle relation is reproduced. The aim of our prospective study, with random selection of 24 patients, was to compare the morphological and functional outcome of the TMJs. The proximal segments in half of the patients had been positioned using devices, in the other half without devices. Read More

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Distal unicondylar fractures of the proximal phalanx.

J Hand Surg Am 1993 Jul;18(4):594-9

Department of Orthopaedics, Brown University School of Medicine, Rhode Island Hospital, Providence 02903.

The records of 38 consecutive patients (38 fractures) who underwent treatment for distal unicondylar fractures of the proximal phalanx were reviewed to evaluate fracture characteristics, mechanism of injury, treatment options, and functional outcomes. Four classes of fracture pattern were defined radiographically. Most fractures occurred during ball sports and involved an axial splitting of extended digits, with the condyle closet to the midline of the hand fracturing most commonly. Read More

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