21 results match your criteria unloaded miniscrew

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Effects of orthodontic forces on bone turnover biomarkers in peri-miniscrew crevicular fluid: A systematic review.

Int Orthod 2020 Sep 22;18(3):403-411. Epub 2020 Apr 22.

Aristotle University of Thessaloniki, Department of Preventive Dentistry, Periodontology and Implant Biology, Thessaloniki, Greece.

Objective: Peri-miniscrew crevicular fluid (PMCF) analysis of biomarkers representing bone formation or resorption could provide a non-invasive way to monitor bone turnover around miniscrews and the response to force loading. Our objective was to systematically investigate the relevant available evidence.

Materials And Methods: Search without restrictions in eight databases and hand searching until March 2020 took place. Read More

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September 2020

Influence of orthodontic loading on biomarkers levels around miniscrews.

Arch Oral Biol 2020 Apr 27;112:104668. Epub 2020 Jan 27.

Department of Orthodontics, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.

Objective: The aim of this study was to evaluate the levels of Interleukin-1α (IL-1α), Interleukin-1β (IL-1β), Interleukin-1 receptor antagonist (IL-1Ra), Interleukin-10 (IL-10), Interleukin-13 (IL-13), Vascular endothelial growth factor (VEGF), Granulocyte-colony stimulating factor (G-CSF), and Growth related oncogene (GRO) in the peri-miniscrew implant crevicular fluid (MICF) under orthodontic loading.

Design: The study sample comprised 14 miniscrews immediately loaded and 17 unloaded ones. A load of 200gF was immediately applied to the miniscrews in the loaded group after the placement surgery. Read More

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A review of biomarkers in peri-miniscrew implant crevicular fluid (PMICF).

Prog Orthod 2017 Nov 27;18(1):42. Epub 2017 Nov 27.

Centre for Biomedical Engineering, Indian Institute of Technology Delhi, New Delhi, India.

Background: The temporary anchorage devices (TADs) which include miniscrew implants (MSIs) have evolved as useful armamentarium in the management of severe malocclusions and assist in complex tooth movements. Although a multitude of factors is responsible for the primary and secondary stability of miniscrew implants, contemporary research highlights the importance of biological interface of MSI with bone and soft tissue in augmenting the success of implants. The inflammation and remodeling associated with MSI insertion or loading are reflected through biomarkers in peri-miniscrew implant crevicular fluid (PMICF) which is analogous to the gingival crevicular fluid. Read More

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November 2017

Torque Loss After Miniscrew Placement: An In-Vitro Study Followed by a Clinical Trial.

Open Dent J 2016 31;10:251-60. Epub 2016 May 31.

Department of Orthodontics, School of Dentistry, University of Genova, Viale Benedetto XV 6, 16132 Genova, Italy.

To evaluate torque loss a week after insertion, both in an in vivo and an in vitro experimental setup were designed. In the in vivo setup a total of 29 miniscrews were placed in 20 patients who underwent orthodontic treatment. Maximum insertion torque (MIT) was evaluated at insertion time (T1). Read More

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Immediate versus delayed loading: comparison of primary stability loss after miniscrew placement in orthodontic patients-a single-centre blinded randomized clinical trial.

Eur J Orthod 2016 Dec 4;38(6):652-659. Epub 2016 Jan 4.

*Orthodontics Department, School of Dentistry, University of Genova, Italy.

Introduction: The aim of this randomized clinical trial was to compare torque recordings at insertion time and 1 week post-placement between immediately loaded orthodontic miniscrews and an unloaded control group.

Trial Design: This RCT was designed as parallel with an allocation ratio of 1:1.

Methods: Eligibility criteria to enroll patients were: needs of fixed orthodontic treatment, no systemic disease, absence of using drugs altering bone metabolism. Read More

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December 2016

A new method to evaluate the positional stability of a self-drilling miniscrew.

Orthod Craniofac Res 2015 Aug 19;18(3):125-33. Epub 2015 Feb 19.

Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, China.

Objectives: To evaluate the positional stability of miniscrews during orthodontic treatment change in cone-beam computed tomography (CBCT).

Setting And Sample Population: Twenty adult volunteers were enrolled.

Methods: In all participants, at least two maxillary first premolars were extracted because of protrusion. Read More

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Local application of zoledronate enhances miniscrew implant stability in dogs.

Am J Orthod Dentofacial Orthop 2014 Jun;145(6):737-49

Regents professor and director of Orthodontic Research, Department of Orthodontics, Texas A&M University Baylor College of Dentistry, Dallas, Tex. Electronic address:

Introduction: The primary purposes of this study were to evaluate how locally delivered zoledronate affects the longitudinal stability of miniscrew implants (MSIs) and the healing of bone around MSIs.

Methods: Using a randomized split-mouth design, 60 unloaded MSIs (5 × 1.6 mm) were placed in skeletally mature male foxhound-mixed breed dogs. Read More

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Evaluation of the effects of different surface configurations on stability of miniscrews.

ScientificWorldJournal 2013 1;2013:396091. Epub 2013 Jul 1.

Department of Orthodontics, School of Dentistry, University of Gaziantep, Sehitkamil, 27310 Gaziantep, Turkey.

Introduction: The aim of this study was to analyze the effects of screw design and force application on the stability of miniscrews, using RTT, SEM, and histomorphometric analyses.

Materials And Methods: Eighty cylindrical, self-drilling, and Ti6Al4V alloy miniscrews (1,6 × 6 mm) were used. Four mini-screws were inserted in fibulas of each rabbit, and 115 G of force was immediately applied. Read More

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February 2014

OPG and RANKL levels around miniscrew implants during orthodontic tooth movement.

Am J Orthod Dentofacial Orthop 2013 Aug;144(2):203-9

Department of Periodontology, Faculty of Dentistry, Izmir Katip Celebi University, Izmir, Turkey.

Introduction: The aim of this study was to determine the peri-miniscrew implant crevicular fluid receptor activator of nuclear factor-кB ligand (RANKL) and osteoprotegerin (OPG) levels around loaded and unloaded miniscrew implants at different time intervals.

Methods: Twenty loaded and 16 unloaded miniscrew implants were included in this study. All miniscrew implants were placed bilaterally between the maxillary second premolars and first molars as anchorage units for canine distalization. Read More

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Effect of immediate loading on the biomechanical properties of bone surrounding the miniscrew implants.

Eur J Orthod 2013 Oct 4;35(5):577-82. Epub 2012 Sep 4.

Division of Orthodontics and Dentofacial Orthopedics, Department of Oral Growth and Development, School of Dentistry, Health Sciences University of Hokkaido, Ishikari-Tobetsu.

The aim of this study was to investigate the effect of immediate loading on the biomechanical properties of bone surrounding a miniscrew implant. Forty titanium alloy miniscrew implants were placed on the buccal side of the maxillae and mandibles in four beagle dogs. Twelve pairs of miniscrew implants were immediately loaded with approximately 150 g of continuous force using nickel-titanium coil springs and the remaining 16 implants were left unloaded for 8 weeks. Read More

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October 2013

Effect of force on alveolar bone surrounding miniscrew implants: a 3-dimensional microcomputed tomography study.

Am J Orthod Dentofacial Orthop 2012 Jul;142(1):32-44

Restorative Sciences, Baylor College of Dentistry, Texas A&M Health Science Center, Dallas, TX 75246, USA.

Introduction: The primary aim of this study was to better understand how bone adapts to forces applied to miniscrew implants. A secondary aim was to determine whether the direction of force applied to miniscrew implants has an effect on bone surrounding the miniscrew implants.

Methods: A randomized split-mouth design, applied to 6 skeletally mature male foxhound dogs, was used to compare miniscrew implants loaded for 9 weeks with 200 or 600 g to unloaded control miniscrew implants. Read More

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Stability changes of miniscrew implants over time.

Angle Orthod 2011 Nov 25;81(6):994-1000. Epub 2011 May 25.

Orthodontic Department, Saint Louis University, Missouri, USA.

Purpose: To quantify in vivo changes in miniscrew implant (MSI) stability over time using resonance frequency analysis, and to determine if pilot holes and placement sites affect changes in MSI stability.

Materials And Methods: Twenty-two self-tapping MSIs (1.6 mm wide and 9 mm long) were placed in the maxillae of 2 adult beagle dogs (20 months old). Read More

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November 2011

Stable region for maxillary dental cast superimposition in adults, studied with the aid of stable miniscrews.

Orthod Craniofac Res 2011 May 9;14(2):70-9. Epub 2011 Mar 9.

Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, China.

Objectives: To identify a stable and reproducible reference region to superimpose serial maxillary dental models in adult extraction cases.

Setting And Sample Population: Fifteen adult volunteers were enrolled.

Methods: To reduce protrusion, bilateral maxillary first premolars were extracted in all volunteers. Read More

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Three-dimensional analysis of peri-bone-implant contact of rough-surface miniscrew implants.

Am J Orthod Dentofacial Orthop 2011 Feb;139(2):e153-63

Baylor College of Dentistry, Dallas, Texas, USA. [corrected]

Introduction: In this study, we evaluated the effects of surface modifications of miniscrew implants (MSIs) and force application on bone surrounding MSIs.

Methods: Seven skeletally mature male foxhound dogs were followed for 9 weeks; a randomized split-mouth design was used to compare 21 MSIs with sandblasted, large-grit, and acid-etched (SLA) surfaces and 21 identical machine-surfaced MSIs. MSIs immediately loaded with 200-g nickel-titanium coil springs were compared with unloaded MSIs. Read More

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February 2011

The effect of rotation moment on the stability of immediately loaded orthodontic miniscrews: a pilot study.

Eur J Orthod 2010 Dec 13;32(6):614-9. Epub 2010 May 13.

Department of Orthodontics, College of Dentistry, Oral Science Research Center, The Institute of Cranio-facial Deformity, Yonsei University, Seoul, Korea.

The aim of this study was to evaluate the effect of the direction and magnitude of the rotation moment to loaded orthodontic miniscrews on stability. In six adult male beagle dogs (12 months old), 36 orthodontic miniscrews were inserted into the mandibular buccal alveolar bone without drilling. Immediately after insertion, 24 miniscrews were loaded with 1- and 2-Ncm nickel titanium (NiTi) coil springs with either a clockwise or counterclockwise rotation moment while 12 miniscrews were left unloaded. Read More

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December 2010

Rat model for studying tissue changes induced by the mechanical environment surrounding loaded titanium implants.

Int J Oral Maxillofac Implants 2009 Sep-Oct;24(5):800-7

Department of Stomatology, Third Hospital of Hebei Medical University, ShiJiaZhuang, China.

Purpose: This study presents a new rat oral implant model for assessing histologic changes in the mechanical environment surrounding loaded and unloaded dental implants.

Materials And Methods: The maxillary left first molar from retired breeder rats was extracted, and the site was allowed to heal for 1 month. A titanium miniscrew implant was then placed into the site and allowed to heal for 21 days. Read More

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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

Stability of immediately loaded 3- and 6-mm miniscrew implants in beagle dogs--a pilot study.

Am J Orthod Dentofacial Orthop 2009 Aug;136(2):251-9

Department of Orthodontics, Baylor College of Dentistry, Texas A&M University System Health Science Center, Dallas, Tex., USA.

Introduction: We compared the stability of 3- and 6-mm long miniscrew implants (MSIs) loaded with orthopedic force levels.

Methods: Using a split-mouth experimental design, we placed MSIs into the jaws of 5 mature beagle dogs and immediately loaded them for 6 weeks. Continuous forces were applied by reciprocally loading pairs of MSIs with nickel-titanium coil springs. Read More

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Effects of intentional damage of the roots and surrounding structures with miniscrew implants.

Am J Orthod Dentofacial Orthop 2009 Mar;135(3):280.e1-9; discussion 280-1

Orthodontic Department, Baylor College of Dentistry, Texas A&M Health Science Center, Dallas, TX 75246, USA.

Introduction: The purposes of the study were to evaluate the immediate damage to roots and periodontal structures after initial miniscrew implant (MSI) placement and the short- and long-term damage after MSIs were left in situ.

Methods: The roots of the maxillary second, third, and fourth premolars of 7 mature beagle dogs were randomly assigned to undergo immediate, short-term (left for 6 weeks), or long-term (left for 12 weeks) damage. Intentional damage was inflicted with self-tapping screws (1. Read More

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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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[Stability of the miniscrew implant during healing period].

Zhonghua Kou Qiang Yi Xue Za Zhi 2006 Apr;41(4):226-7

Department of Orthodontics, Faculty of Stomatology, Capital University of Medical Sciences, Beijing 100050, China.

Objective: To evaluate the stability of mini-screw implant during different healing periods in the unloaded conditions.

Methods: Sixty titanium mini-screws were used in this study. A total of 10 New Zealand white rabbits were randomly divided into 5 groups according to different healing periods. Read More

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