785 results match your criteria miniscrew


Incidence of orthodontic appliance failures during the COVID-19 lockdown period.

Am J Orthod Dentofacial Orthop 2021 Aug 27. Epub 2021 Aug 27.

Department of Periodontology, Faculty of Dentistry, Adıyaman University, Adıyaman, Turkey.

Introduction: As a result of the rapid spread of the disease caused by severe acute respiratory syndrome coronavirus 2, the World Health Organization declared a global pandemic on March 11, 2020. Governments worldwide adopted various measures to stop or slow the spread of coronavirus disease 2019 (COVID-19). One widely used measure was lockdown; workers who could work from home were instructed to do so, and nonessential businesses-including dental clinics-were closed for weeks or months. Read More

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Dentoskeletal comparison of miniscrew-anchored maxillary protraction with hybrid and conventional hyrax expanders: A randomized clinical trial.

Am J Orthod Dentofacial Orthop 2021 Sep 8. Epub 2021 Sep 8.

Department of Orthodontics, Bauru Dental School, and Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru, São Paulo, Brazil.

Introduction: This randomized clinical trial aimed to compare the skeletal and dental effects of miniscrew-anchored maxillary protraction (MAMP) using hybrid hyrax (HH) and conventional hyrax (CH) expanders in growing patients with Class III malocclusion.

Methods: This was a randomized, parallel, controlled trial. Forty growing patients with Class III malocclusion and maxillary deficiency (Wits appraisal of less than -1 mm) were randomized into 2 groups. Read More

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September 2021

Treatment of open-bite tendency with a miniscrew-supported transpalatal arch and myofunctional exercises.

J Clin Orthod 2021 May;55(4):51-514

College of Dentistry, Texas A&M University, Dallas, TX; Private Practice of Orthodontics, Wichita Falls, TX.

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The VISTA Approach in Canine Disimpaction.

Methods Protoc 2021 Aug 20;4(3). Epub 2021 Aug 20.

Department of Oral and Maxillofacial Sciences, "Sapienza" University of Rome, Via Caserta 6, 00161 Rome, Italy.

Canine disimpaction is always a challenging orthodontic treatment overall, even when the impacted permanent canine is in a high position, especially when in tight relation with the upper incisors' roots. Conventional treatment methods are usually not capable of performing the correct force direction, consisting of the contemporary movement in the distal and vestibular directions of the canine crown, often provoking, as side effects, the presence of decubitus on the mucous of the lips and cheeks or a poor final appearance of the periodontal support of the disimpacted canine. Among the different approaches, the vertical incision subperiosteal tunnel access (VISTA) technique shows good performance with regard to the direction of the forces and the canine's periodontal conditions when erupted; it is usually realized through an elastic chain connected to a temporary anchorage device (TAD) in the posterior area. Read More

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Comparison between Topical and Injection Anesthetics on Pain Related to Orthodontic Miniscrew Placement: A Split-mouth Study.

J Contemp Dent Pract 2021 Jun 1;22(6):637-643. Epub 2021 Jun 1.

Department of Oral and Maxillofacial Surgery and Oral Medicine, Faculty of Odontology, Malmö University, Sweden.

Aims And Objectives: The aims of this study were to compare the anesthetic effect of a lidocaine/prilocaine (L/P) topical anesthetic with placebo on pain from needle sticks and to compare the anesthetic effect of the L/P topical anesthetic with an infiltrative anesthetic on pain from orthodontic miniscrew placement.

Materials And Methods: Pain elimination was analyzed from two interventions: (a) needle stick and (b) miniscrew insertion. When assessing pain from needle stick, one side of the mandible received 2. Read More

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Safe sites for orthodontic miniscrew insertion in the infrazygomatic crest area in different facial types: A tomographic study.

Am J Orthod Dentofacial Orthop 2021 Aug 11. Epub 2021 Aug 11.

Department of Orthodontics, School of Dentistry, University of São Paulo, São Paulo, Brazil.

Introduction: Temporary skeletal anchorage devices (TSADs) are used to obtain skeletal anchorage for orthodontic treatment. Their insertion in the infrazygomatic crest (IZC) allows efficient orthodontic mechanics. Different facial types have different bone configurations. Read More

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Accuracy of direct insertion of TADs in the anterior palate with respect to a 3D-assisted digital insertion virtual planning.

Orthod Craniofac Res 2021 Aug 3. Epub 2021 Aug 3.

Orthodontic Department, Dental School, Genova University, Genova, Italy.

Background: Direct and 3D-assisted methods are an available alternative when inserting temporary anchorage devices (TADs) in the anterior palate for orthodontic anchorage. This study aimed to evaluate the differences between a planned insertion versus a direct method on digital models.

Settings And Sample Population: Seventy TADs were inserted by the direct insertion method in 35 patients who needed palatal TADs for orthodontic anchorage. Read More

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Anchorage control using miniscrews in comparison to Essix appliance in treatment of postpubertal patients with Class II malocclusion using Carrière Motion Appliance.

Angle Orthod 2021 Aug 2. Epub 2021 Aug 2.

Objectives: To evaluate anchorage control using miniscrews vs an Essix appliance in treatment of Class II malocclusion by distalization using the Carrière Motion Appliance (CMA).

Materials And Methods: Twenty-four postpubertal female patients with Class II, division 1 malocclusion were randomly distributed into two equal groups. CMA was bonded in both groups, and one group was treated with miniscrews as anchorage (12 patients, mean age = 18. Read More

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Effect of miniscrew insertion angle in the maxillary buccal plate on its clinical survival: a randomized clinical trial.

Prog Orthod 2021 Aug 2;22(1):22. Epub 2021 Aug 2.

Department of Oral and Maxillofacial Radiology, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran.

Introduction: This study sought to assess the effect of miniscrew insertion angle (vertical and oblique) on its clinical survival under shearing forces in orthodontic patients undergoing canine retraction.

Materials And Methods: In this split-mouth randomized controlled clinical trial, 50 miniscrews were placed bilaterally in 25 patients with 45° and 90° insertion angles relative to a line perpendicular to the occlusal plane distal to the maxillary first premolar extraction site. Allocation of insertion angles to the right/left side was random using the Random Allocation Software. Read More

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Comparison of the efficacy of two-time versus one-time micro-osteoperforation on maxillary canine retraction in orthodontic patients: A split-mouth randomized controlled clinical trial.

Int Orthod 2021 Sep 16;19(3):415-424. Epub 2021 Jul 16.

Department of Biochemistry, All India Institute of Medical Sciences, New Delhi 110029, India.

Background: Micro-osteoperforation (MOP), a minimally invasive technique for accelerating the rate of orthodontic tooth movement has been research extensively, but with varied clinical results.

Objective: To compare the efficacy of one-time versus two-time micro-osteoperforation on the rate of maxillary canine retraction, its influence on anchorage loss, canine angulation and the levels of interleukin (IL-1β) in gingival crevicular fluid (GCF).

Materials And Methods: The split-mouth study included 16 patients in which the left and right sides were randomly allocated to the control side (one-time MOP) and experimental side (two-time MOP). Read More

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September 2021

Clinical effectiveness of orthodontic miniscrew implantation guided by a novel cone beam CT image-based computer aided design and computer aided manufacturing (CAD-CAM) template.

Ann Transl Med 2021 Jun;9(12):1025

School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing, China.

Background: Although miniscrews are widely used in orthodontic treatment as temporary anchorage devices, their correct and safe placement has attracted little attention. This study aimed to introduce a novel cone beam CT (CBCT) image-based computer aided design and computer aided manufacturing (CAD-CAM) template for orthodontic miniscrew implantation and to evaluate the effectiveness of miniscrews implanted under the guidance of this template.

Methods: The CBCT scans of ten patients requiring miniscrews as anchorage were analyzed in NNT software to predetermine the insertion sites of miniscrew implants. Read More

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Root resorption associated with maxillary buccal segment intrusion using variable force magnitudes: A randomized clinical trial.

Angle Orthod 2021 Jul 16. Epub 2021 Jul 16.

Objectives: To compare the root resorption resulting from miniscrew-supported maxillary posterior dentoalveolar intrusion using two different force magnitudes.

Materials And: Methods: Adult patients with skeletal open bite, indicated for maxillary posterior dentoalveolar intrusion, were recruited and randomly assigned to the comparison or intervention groups. The comparison group involved applying 200 g of intrusive force per segment, which measured 20 g per root, while this force was 400 g per segment in the intervention group, measuring 40 g per root. Read More

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[Biomechanics of mini-implants : analysis of the adverse effects of four clinical situations and proposed resolutions].

Orthod Fr 2021 Jun;92(2):195-214

Unité Fonctionnelle d'Orthopédie Dento-Faciale, Centre de Traitements Dentaires, Hospices Civils de Lyon, 6-8 place Depéret, 69365 Lyon cedex 03, France, Faculté d'Odontologie, Université Claude Bernard Lyon 1, 11 rue Guillaume Paradin, 69372 Lyon Cedex 08, France.

The biomechanical adverse effects generated by our treatments must be considered among the failures of mini-implants, certainly excellent means of anchorage. The aim of this article was to illustrate and comment on mechanical adverse effects and to propose solutions. Four common clinical situations in vestibular technique are analyzed, decomposed three-dimensionally and solved. Read More

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Influence of insertion depth on stress distribution in orthodontic miniscrew and the surrounding bone by finite element analysis.

Dent Mater J 2021 Jun 30. Epub 2021 Jun 30.

Department of Orthodontics and Dentofacial Orthopedics, Institute of Biomedical Sciences, Tokushima University Graduate School.

We aimed to elucidate stress distribution in miniscrews and the surrounding bone when miniscrews inserted at different depths were implanted vertically or obliquely. The distributions of the equivalent stress on the screw surface and the minimum principal stress in the surrounding bone were calculated using finite element models. When the miniscrews were inserted vertically and obliquely, screw head displacement, greatest equivalent stress on the miniscrew surface, and absolute value of minimum principal stresses in the surrounding bone decreased with increasing insertion depth. Read More

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[The experimental study of a Russian orthodontic mini-screw].

Stomatologiia (Mosk) 2021 ;100(3):7-12

Central Research Institute of Dentistry and Maxillofacial Surgery, Moscow, Russia.

Background: The aim of this research is the experimental study measuring stability of the orthodontic miniscrews «Turbo» designed in Russia in comparison with its foreign analogues, namely, «Vector Tas» (USA) and «BioRay» (Taiwan).

Material And Methods: Four self-drilling orthodontic miniscrews of each manufacturer, i.e. Read More

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Would midpalatal suture characteristics help to predict the success rate of miniscrew-assisted rapid palatal expansion?

Am J Orthod Dentofacial Orthop 2021 Sep 24;160(3):363-373. Epub 2021 Jun 24.

Department of Orthodontics, School of Dentistry, São Paulo State University, Araraquara, São Paulo, Brazil.

Introduction: The objective of this study was to evaluate whether the success or failure of miniscrew-assisted rapid palatal expansion (MARPE) in patients with advanced bone maturation could be related to factors such as midpalatal suture density (MPSD), midpalatal maturation stage (MPSM), midpalatal bone thickness (MBTh), palatal length (PL), expander screw position (ESP), and patient's age.

Methods: Cone-beam computed tomography scans of 25 patients of both sexes, aged 15-37 years (23 ± 7.2), presenting transverse maxillary deficiency and complete skeletal maturation (cervical vertebral maturation stage 5) treated using MARPE were evaluated. Read More

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September 2021

Uprighting an Impacted Lower Canine with Miniscrew Anchorage in a Severely Oligodontic Patient.

J Clin Orthod 2021 Apr;55(4):237-245

Orthodontics Department, Dental School, Genova University, Genoa, Italy.

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Bone depth and thickness of different infrazygomatic crest miniscrew insertion paths between the first and second maxillary molars for distal tooth movement: A 3-dimensional assessment.

Am J Orthod Dentofacial Orthop 2021 Jul 3;160(1):113-123. Epub 2021 Jun 3.

Department of Anatomy, Guangdong Provincial Key Laboratory of Medical Biomechanics, School of Basic Medical Sciences, Southern Medical University, and Nanhai Hospital, Southern Medical University, Guangdong, China. Electronic address:

Introduction: This research aimed to measure the bone depth and thickness of different insertion paths for safe placement of infrazygomatic crest miniscrews between the first (U6) and second maxillary molars (U7) by 3-dimensional (3D) reconstruction and to explore their clinical significance.

Methods: Cone-beam computed tomography data from 36 adult orthodontic patients were obtained to generate 3D models (n = 72) of the infrazygomatic crest region. For each model, the bone depth and thickness of 27 different insertion paths were measured in the region between U6 and U7. Read More

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Effect of Different Head Hole Position on the Rotational Resistance and Stability of Orthodontic Miniscrews: A Three-Dimensional Finite Element Study.

Sensors (Basel) 2021 May 30;21(11). Epub 2021 May 30.

Division of Orthodontics, Department of Orofacial Science, University of California, San Francisco, CA 94143, USA.

The orthodontic miniscrew is driven into bone in a clockwise direction. Counter-clockwise rotational force applied to the implanted miniscrew can degrade the stability. The purpose of this three-dimensional finite element study was to figure out the effect of shifting the miniscrew head hole position from the long axis. Read More

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Effects of Skeletally Supported Anterior en Masse Retraction with Varied Lever Arm Lengths and Locations in Lingual Orthodontic Treatment: A 3D Finite Element Study.

Biomed Res Int 2021 17;2021:9975428. Epub 2021 May 17.

Department of Orthodontics, Near East University, Nicosia, Northern Cyprus, Mersin 10, Turkey.

Objective: This study is aimed at analyzing different points of force application during miniscrew supported en masse retraction of the anterior maxillary teeth to identify the best line of action of force in lingual orthodontic treatment.

Materials And Methods: Three-dimensional (3D) finite element models were created to stimulate en masse retraction with different heights and positions of the miniscrew and lever arm to change the force application points; a 150 g retraction force was applied from the miniscrew to the lever arms, and the initial tooth displacements were analyzed.

Results: Lingual crown tipping and occlusal crown extrusion were seen at all heights and positions of the miniscrew and lever arm, but when the miniscrew height was at 8 mm and the power arm was located between the lateral incisors and canines, these tipping patterns were less than those obtained with a 4. Read More

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Computed tomography assessment of maxillary bone density for orthodontic mini-implant placement with respect to vertical growth patterns.

J Orthod 2021 May 31:14653125211020015. Epub 2021 May 31.

Department of Orthodontics, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Chennai, India.

Objective: To quantitatively measure and report bone density of maxilla in the interradicular (alveolar and basal bone) and infrazygomatic crest (IZC) region in various growth patterns among Dravidian individuals.

Design: This was a retrospective spiral computed tomography (CT) study.

Setting: The study was conducted at the Department of Orthodontics, Saveetha Dental College and Hospital, Tamil Nadu, India. Read More

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Upper airway changes in Class III patients using miniscrew-anchored maxillary protraction with hybrid and hyrax expanders: a randomized controlled trial.

Clin Oral Investig 2021 May 27. Epub 2021 May 27.

Department of Orthodontics, School of Dental Medicine, Case Western Reserve University, 9601 Chester Avenue, OH, 44106, Cleveland, USA.

Objectives: The aim of this study was to compare the upper airway space changes after miniscrew-anchored maxillary protraction with hybrid (HH) and conventional hyrax (CH) expanders.

Material And Methods: The sample comprised Class III malocclusion growing patients that were randomized into two groups of miniscrew-anchored maxillary protraction. The group HH was treated with a hybrid hyrax appliance in the maxilla and two miniscrews distally to the canines in the mandible. Read More

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Nonsurgical maxillary expansion in a 60-year-old patient with gingival recession and crowding.

Korean J Orthod 2021 May;51(3):217-227

Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry, Seoul, Korea.

Maxillary transverse deficiency often manifests as a posterior crossbite or edge-to-edge bite and anterior crowding. However, arbitrary arch expansion in mature patients has been considered to be challenging due to the possible periodontal adverse effects such as alveolar bone dehiscence and gingival recession. To overcome these limitations, nonsurgical maxillary expansion of the basal bone has been demonstrated in young adults. Read More

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Complications reported with the use of orthodontic miniscrews: A systematic review.

Korean J Orthod 2021 May;51(3):199-216

Department of Biomedical and Dental Sciences and Morphofunctional Imaging, Section of Orthodontics, School of Dentistry, University of Messina, Policlinico Universitario G. Martino, Messina, Italy.

Objective: The aim of this systematic review was to evaluate the complications and side effects associated with the clinical use of orthodontic miniscrews by systematically reviewing the best available evidence.

Methods: A survey of articles published up to March 2020 investigating the complications associated with miniscrew insertion, in both the maxilla and mandible, was performed using 7 electronic databases. Clinical studies, case reports, and case series reporting complications associated with the use of orthodontic miniscrew implants were included. Read More

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The effect of different micro-osteoperforation depths on the rate of orthodontic tooth movement: A single-center, single-blind, randomized clinical trial.

Korean J Orthod 2021 May;51(3):157-165

Department of Orthodontics, Faculty of Dentistry, Ondokuz Mayıs University, Atakum, Samsun, Turkey.

Objective: This study aimed to identify the clinical effectiveness of two different penetration depths of micro-osteoperforations (MOPs) on the rate of orthodontic tooth movement.

Methods: Twenty-four patients requiring the removal of the upper first premolar teeth were selected and randomly divided into two groups. The control group participants did not undergo MOPs. Read More

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Comparison of one versus two maxillary molars distalization with iPanda: a finite element analysis.

Prog Orthod 2021 May 3;22(1):12. Epub 2021 May 3.

Department of Orthodontics, Faculty of Dentistry, Bangkokthonburi University, 16/10 Leabklongtaweewatana Rd., Taweewatana District, Bangkok, 10170, Thailand.

Background: The purpose of this study was to compare the stress distribution and displacement patterns of the one versus two maxillary molars distalization with iPanda and to evaluate the biomechanical effect of distalization on the iPanda using the finite element method.

Methods: The finite element models of a maxillary arch with complete dentition, periodontal ligament, palatal and alveolar bone, and an iPanda connected to a pair of midpalatal miniscrews were created. Two models were created to simulate maxillary molar distalization. Read More

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Evaluation of Cortical Bone Microdamage and Primary Stability of Orthodontic Miniscrew Using a Human Bone Analogue.

Materials (Basel) 2021 Apr 7;14(8). Epub 2021 Apr 7.

Department of Maxillofacial Orthognathics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8510, Japan.

Orthodontic miniscrews have gained popularity; however, they have some drawbacks, including screw loosening that results from bone resorption caused by excess microdamage created during screw insertion. Pilot hole preparation through the cortical bone is considered beneficial to avoid such microdamage, while an overly large pilot hole impairs primary stability. Hence, we used a human bone analogue to evaluate the microdamage and primary stability to estimate the optimal pilot hole size that would minimize the screw loosening risk. Read More

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Evaluation and Comparison of the Effect of Elastomeric Chain and Stainless Steel Ligature Wire on Maxillary Orthodontic Miniscrew Failure.

Int J Appl Basic Med Res 2021 Apr-Jun;11(2):100-105. Epub 2021 Apr 8.

Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, Madhya Pradesh, India.

Context: Orthodontic miniscrews are used for the purpose of conservation of anchorage.

Aims: The aim of the study was to evaluate the orthodontic miniscrew failure between the elastomeric chain-supported retraction and stainless steel (SS) ligature-aided retraction.

Settings And Design: This was a cross-sectional split mouth randomized controlled trial. Read More

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Tomographic assessment of infrazygomatic crest bone depth for extra-alveolar miniscrew insertion in subjects with different vertical and sagittal skeletal patterns.

Orthod Craniofac Res 2021 Apr 28. Epub 2021 Apr 28.

Division of Dentomaxillofacial Radiology, School of Dentistry, Federal University of Bahia, Ufba, Salvador, Brazil.

Objective: To evaluate bone availability at the infrazygomatic crest for extra-alveolar bone miniscrew insertion in subjects with different vertical and sagittal skeletal patterns.

Setting And Sample Population: Measurements of the infrazygomatic crest were performed on multislice computed tomography scans from 58 adults with different skeletal patterns.

Materials And Methods: Infrazygomatic crest bone depth was measured at 4, 5 and 6 mm from the cementoenamel junction (CEJ) of the maxillary first molar at three different angles (60°, 70° and 80°) in the first molar occlusal plane. Read More

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Interarch Traction Strategy for Palatal Cuspid Impactions.

J Contemp Dent Pract 2020 Dec 1;21(12):1408-1411. Epub 2020 Dec 1.

Department of Orthodontics, European University College, Dubai Healthcare City, Dubai, UAE.

Aim And Objective: To disimpact a palatally impacted canine using a novel, compliance-dependent technique.

Background: Orthodontic traction of palatally impacted teeth warrants careful mechanical strategies to avoid complications that include r oot damage to adjacent teeth and r esorptions. Sound biomechanical control to avoid these side effects is considered paramount in planning the traction. Read More

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December 2020