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https://www.readbyqxmd.com/read/28430887/measurement-of-forces-and-moments-around-the-maxillary-arch-for-treatment-of-a-simulated-lingual-incisor-and-high-canine-malocclusion-using-straight-and-mushroom-archwires-in-fixed-lingual-appliances
#1
Brandon Owen, Geoffry Gullion, Giseon Heo, Jason P Carey, Paul W Major, Dan L Romanyk
Introduction: An Orthodontic SIMulator (OSIM) was used to investigate the propagation of forces and moments around a simulated archform for a gingival displaced canine and lingual displaced lateral incisor using fixed lingual orthodontic appliances. Methods: In-Ovation L self-ligating lingual brackets were bonded to anatomically shaped teeth on the OSIM, and the teeth were positioned such that a G4 NiTi 0.016" large maxillary mushroom archwire could be ligated in passive position...
April 20, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/28429956/efficacy-of-piezocision-on-accelerating-orthodontic-tooth-movement-a-systematic-review
#2
Jianru Yi, Jiani Xiao, Yu Li, Xiaobing Li, Zhihe Zhao
OBJECTIVES: The aim of this systematic review was to evaluate the effect of piezocision as an adjunctive procedure to accelerate orthodontic tooth movement. MATERIALS AND METHODS: Randomized controlled trials and controlled clinical trials that investigated the effectiveness of piezocision on accelerating orthodontic tooth movement were identified through electronic and manual searches. The literature search, study inclusion, risk of bias assessment, and data extraction were performed by two reviewers independently...
April 21, 2017: Angle Orthodontist
https://www.readbyqxmd.com/read/28429487/effect-of-orthodontic-treatment-on-the-periodontal-tissues
#3
REVIEW
Joseph S Antoun, Li Mei, Kelsi Gibbs, Mauro Farella
Reduced periodontal support is a challenge that clinicians often face during rehabilitation of compromised dentition. The close and intricate relationship between the periodontal tissues and the processes of tooth movement suggest that adjunct orthodontic therapy may play an important role in overcoming these problems. On the other hand, excessive movement of teeth beyond the anatomic boundaries of the alveolar process is commonly believed to contribute to further destruction of the periodontal tissues. This review evaluates the clinical effects of various orthodontic tooth movements on the surrounding periodontal soft tissues and alveolar bone...
June 2017: Periodontology 2000
https://www.readbyqxmd.com/read/28416159/new-finite-element-study-protocol-clinical-simulation-of-orthodontic-tooth-movement
#4
Antoine Bouton, Yohann Simon, Florent Goussard, Luciano Teresi, Vittorio Sansalone
The aim of this work was to model tooth movement in a more clinically-exact fashion, thanks to the use of new IT tools and imaging systems (cone-beam). Image segmentation and 3D reconstruction now enable us to model the anatomy realistically, while finite element (FE) analysis makes it possible to evaluate stresses and their distribution on the level of the tooth, the periodontal ligament (PDL) and the alveolar bone when a force is applied. The principle is to monitor tooth movement by obtaining optical impressions at each stage of treatment...
April 13, 2017: International Orthodontics
https://www.readbyqxmd.com/read/28414871/effect-of-platelet-rich-plasma-on-orthodontic-tooth-movement-in-dogs
#5
A Rashid, F A ElSharaby, E M Nassef, S Mehanni, Y A Mostafa
OBJECTIVES: To evaluate the effect of platelet-rich plasma (PRP) on the rate of orthodontic tooth movement. METHODS: The sample comprised six skeletally mature male mongrel dogs. The maxillary second premolar in each dog was extracted bilaterally. PRP was prepared and injected around the first premolar in one randomly selected maxillary quadrant while the other quadrant served as the control. Coil springs (150 g) were used to distalize the first premolars for 63 days using TAD as anchorage...
May 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28409326/effect-of-corticision-on-orthodontic-tooth-movement-in-a-rat-model-as-assessed-by-rna-sequencing
#6
Qihui Gu, Shuyu Guo, Dongyue Wang, Tingting Zhou, Lin Wang, Zhendong Wang, Junqing Ma
Corticision is a common technique to accelerate orthodontic tooth movement; however, not much is known about the underlying mechanisms. In this study, we investigated the mechanism of alveolar tissue remodeling after corticision in a rat model of tooth movement (TM) by analyzing the differential transcriptome. A total of 36 male rats were equally divided into TM and TM with corticision (TM+C) groups. Alveolar bone response was examined using micro-computed tomography (micro-CT). Osteoclasts and osteoblasts were quantified on tartrate-resistant acid phosphatase (TRAP) and Goldner's trichrome staining...
April 13, 2017: Journal of Molecular Histology
https://www.readbyqxmd.com/read/28408956/a-controversy-with-respect-to-occlusion
#7
REVIEW
Shunji Fukushima
There are very little controversies on occlusion in healthy individuals, where centric relation is regarded as the criterion for assessing the present occlusion and also for establishing a new occlusal relationship between the upper and the lower jaws. On the other hand, the occlusal position in patients with deformed condyles still remains to be clarified. In this review, the effectiveness and limits of centric relation in these patients are discussed. In addition, the muscle induced occlusal positions, such as the muscular position and the terminal positions of habitual closing movements, are suggested as a substitution for centric relation...
August 2016: Japanese Dental Science Review
https://www.readbyqxmd.com/read/28393366/orthodontic-tensile-strain-induces-angiogenesis-via-type-iv-collagen-degradation-by-matrix-metalloproteinase-12
#8
T Narimiya, S Wada, H Kanzaki, M Ishikawa, A Tsuge, Y Yamaguchi, Y Nakamura
BACKGROUND AND OBJECTIVE: During orthodontic tooth movement (OTM), periodontal ligament (PDL) is remodeled dynamically, which requires sufficient blood supply for the regeneration of PDL. However, little is known about the remodeling of blood vessels during OTM. In this study, we hypothesized that the orthodontic tensile strain upregulates matrix metalloproteinase-12 (MMP-12) expression in the tension zone and induces angiogenesis via degradation of type IV collagen (Col-IV) in vascular endothelial basement membrane during the early stage of OTM...
April 10, 2017: Journal of Periodontal Research
https://www.readbyqxmd.com/read/28393293/gata4-regulates-osteoblastic-differentiation-and-bone-remodeling-via-p38-mediated-signaling
#9
Tingting Zhou, Shuyu Guo, Yuxin Zhang, Yajuan Weng, Lin Wang, Junqing Ma
Osteoblasts play a major role in bone remodeling and are regulated by transcription factors. GATA4, a zinc finger transcription factor from the GATA family, has an unclear role in osteoblast differentiation. In this study, the role of GATA4 in osteoblast differentiation was studied both in vitro and in vivo by GATA4 knockdown. GATA4 expression increased during osteoblast differentiation. GATA4 knockdown in osteoblast precursor cells reduced alkaline phosphatase activity and decreased the formation of calcified nodule in an osteogenic-induced cell culture system...
April 9, 2017: Journal of Molecular Histology
https://www.readbyqxmd.com/read/28392897/the-effect-of-caffeine-on-orthodontic-tooth-movement-in-rats
#10
Mohsen Shirazi, Hamed Vaziri, Behzad Salari, Pouria Motahhari, Shahroo Etemad-Moghadam, Ahmad Reza Dehpour
OBJECTIVES: to determine the effect of different doses of caffeine on orthodontic tooth movement (OTM) in rats. MATERIALS AND METHODS: Forty male 250-300 g Sprague-Dawley rats were randomly divided into four groups of ten animals each and received 0 (control), 1 g/l, 2 g/l and 3 g/l caffeine in tap water for 3 days. Orthodontic appliances were ligated between the maxillary first molars and incisors on the 4th day of the study period. All rats were sacrificed after 2 weeks of treatment after which OTM was measured...
March 2017: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/28391087/effects-of-two-wattages-of-low-level-laser-therapy-on-orthodontic-tooth-movement
#11
M Milligan, Y Arudchelvan, S-G Gong
INTRODUCTION: Mixed outcomes have been found in animal and clinical studies with regard to the use of low-level laser therapy (LLLT) as a modality to accelerate orthodontic tooth movement (OTM). One major reason for the variable findings is the different methodologies and protocols for laser therapy use. OBJECTIVE: The aim of this study was to determine whether orthodontically moved molars exposed to two different wattages at the same energy density of LLLT exhibited differences in the amount of tooth movement and molecular and histological changes in the adjacent periodontal areas...
March 24, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28372293/experimental-quantification-of-the-mechanical-forces-and-moments-applied-on-three-adjacent-orthodontic-brackets
#12
Delphine Wagner, Yves Bolender, Yves Rémond, Daniel George
Orthodontic appliances deliver forces and moments that will determine movement of teeth. To analyze this latter, we developed an experimental setup to measure the mechanical forces applied on the teeth and to calculate, through a simplified theoretical analysis, the reactive forces and corresponding moments onto the brackets of three adjacent teeth. To validate the theoretical and experimental results, we use a simplified clinical situation of a maxillary canine in infraclusion and surrounded by its corresponding upper lateral incisor and first premolar...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28371453/morphometry-microstructure-and-wear-pattern-of-neornithischian-dinosaur-teeth-from-the-upper-cretaceous-ihark%C3%A3%C2%BAt-locality-hungary
#13
Attila Virág, Attila Ősi
Teeth of iguanodontian ornithopods and ceratopsians could be remarkably similar, thus the referral of isolated dental material to particular neornithischian clades can be highly problematic. These groups are represented by the rhabdodontid Mochlodon vorosi and the basal coronosaurian Ajkaceratops kozmai in the Upper Cretaceous Csehbánya Formation at Iharkút (western Hungary). Whereas teeth of Mochlodon are common elements at the locality, no dental material belonging to Ajkaceratops was identified until now...
April 3, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28371361/-identification-of-salivary-protein-biomarkers-for-orthodontically-induced-inflammatory-root-resorption
#14
Karolina Elżbieta Kaczor-Urbanowicz, Omer Deutsch, Batia Zaks, Guy Krief, Stella Chaushu, Aaron Palmon
INTRODUCTION: Orthodontically induced inflammatory root resorption (OIIRR) is one of the most prevalent and unavoidable consequence of orthodontic tooth movement. The aim of this study was to discover potential diagnostic protein biomarkers for detection of OIIRR in whole saliva (WS). METHODS AND MATERIAL: Unstimulated WS was collected from 72 subjects: 48 OIIRR patients and 24 untreated, generally healthy, age and gender matched controls. Radiographic assessment of periapical X-Rays of 4 upper incisors taken before and 9 months after bonding was done...
March 29, 2017: Proteomics. Clinical Applications
https://www.readbyqxmd.com/read/28364905/memotain-a-cad-cam-nickel-titanium-lingual-retainer
#15
Neal D Kravitz, Dan Grauer, Pascal Schumacher, Yong-Min Jo
Approximately 1/2 of maxillary and 1/5 of mandibular multi-stranded lingual retainers fail during retention in some form, either bond failure or wire breakage. Memotain is a new CAD/CAM fabricated lingual retainer wire made of custom-cut nickel-titanium, as an alternative to multi-stranded lingual retainers. It offers numerous perceived advantages to the traditional multi-stranded stainless steel wire, including precision fit, avoidance of interferences, corrosion resistance and even the potential for minor tooth movement as an active lingual retainer...
April 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28364896/sixteen-week-analysis-of-unaltered-elastomeric-chain-relating-in-vitro-force-degradation-with-in-vivo-extraction-space-tooth-movement
#16
Kristin S Evans, Cory M Wood, Allen H Moffitt, John A Colgan, J Kevin Holman, Steven D Marshall, D Spencer Pope, Lew B Sample, Stephen L Sherman, Peter M Sinclair, Tim S Trulove
INTRODUCTION: The purposes of this study were to evaluate whether unaltered elastomeric chain can continue to move teeth for 16 weeks and to relate it to the amount of force remaining for the same batch of elastomeric chains. METHODS: The in-vivo portion of the study had a sample of 30 paired extraction space sites from 22 subjects who were measured for closure of the space every 28 days. The altered side elastomeric chain served as the control and was replaced at 28-day intervals whereas the experimental side remained unaltered...
April 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28364894/apical-root-resorption-due-to-mandibular-first-molar-mesialization-a-split-mouth-study
#17
Jonas Winkler, Nicolas Göllner, Peter Göllner, Pawel Pazera, Nikolaos Gkantidis
INTRODUCTION: Our aim was to evaluate the risk of external apical root resorption (EARR) in mesialized mandibular molars due to space closure in patients with unilateral second premolar agenesis. The contralateral side served as the control. METHODS: After application of eligibility criteria, 25 retrospectively selected subjects (median age, 14.9 years; range, 12.0-31.9 years) were analyzed. Space closure (approximately 10 mm) was performed using skeletal anchorage...
April 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28358285/external-apical-root-resorption-concurrent-with-orthodontic-forces-the-genetic-influence
#18
Nuria Nieto-Nieto, Jose Enrique Solano, Rosa Yañez-Vico
Root resorption is a pathological process of multifactorial origin related to the permanent loss of dental root structure in response to a mechanical, inflammatory, autoimmune or infectious stimulus. External apical root resorption (EARR) is a frequent clinical complication secondary to orthodontic tooth movement; apart from variables related to treatment, environmental factors and/or interindividual genetic variations can confer susceptibility or resistance to its occurrence. In this context, genetic predisposition has been described as an etiological factor, together with mechanical factors derived from orthodontic treatment...
May 2017: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/28357471/mechanical-load-exerted-by-pet-g-aligners-during-mesial-and-distal-derotation-of-a-mandibular-canine-an-in-vitro-study
#19
F Elkholy, B Mikhaiel, F Schmidt, B G Lapatki
INTRODUCTION: The six force-moment (F/M) components exerted by aligners of different thickness during simulated mesiorotation and distorotation of a mandibular canine were studied. MATERIALS AND METHODS: An acrylic mandibular model with a separated right canine mounted on a hexapod via a 3D F/M sensor was used. Duran+(®) aligners (Scheu Dental, Germany) of thickness 0.5, 0.625, and 0.75 mm were fabricated on plaster models with the measurement tooth in its neutral position...
March 29, 2017: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/28349912/correlation-of-orthodontic-treatment-by-fixed-or-myofunctional-appliances-and-periodontitis-a-retrospective-study
#20
Kanchan Sharma, Sukhpreet Mangat, Modi S Kichorchandra, Akash Handa, Suresh Bindhumadhav, Meenakshi Meena
INTRODUCTION: Malocclusion plays an important role in the development of periodontitis. Thus, by treating malocclusion, a good gingival health can be achieved. This study was conducted to establish the correlation between orthodontic tooth movement and periodontitis. MATERIALS AND METHODS: This is a retrospective study conducted on 220 patients who underwent orthodontic treatment for malocclusion. They were divided into two groups: Group I patients were treated with fixed orthodontics, while group II patients received myofunctional appliances...
April 1, 2017: Journal of Contemporary Dental Practice
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