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https://www.readbyqxmd.com/read/29145526/factors-affecting-the-decision-to-use-cemented-or-screw-retained-fixed-implant-supported-prostheses-a-critical-review
#1
Miguel Gómez-Polo, Rocio Ortega, Cristina Gómez-Polo, Alicia Celemin, Jaime Del Rio Highsmith
PURPOSE: This review aimed to compile and enumerate all the factors described in the literature that may affect the decision to use either cemented or screw-retained restorations and to determine the relative weights of each factor by type of retention and prosthesis. MATERIALS AND METHODS: The literature was reviewed, and the factors were classified as either determining (present in a clinical situation in which one of the retention mechanisms was clearly more suitable than the other) or conditioning (present in clinical situations in which one type of restoration was not clearly more advantageous than the other)...
November 16, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29143388/in-vitro-assessment-of-retention-and-resistance-failure-loads-of-teeth-restored-with-a-complete-coverage-restoration-and-different-core-materials
#2
Vasileia Tsiagali, Yvoni Kirmanidou, Argirios Pissiotis, Konstantinos Michalakis
PURPOSE: To investigate in vitro the retention and the resistance form, as well as the failure modes of maxillary premolars restored with cast metal crowns and different core materials. MATERIALS AND METHODS: Sixty human extracted maxillary premolars were selected according to their size and were embedded in PMMA resin blocks. After removing a part of their clinical crowns, the teeth were randomly divided into 3 groups of 20 teeth and were either left unrestored, or they were restored with amalgam or composite resin...
November 16, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29142639/effect-of-ferrule-on-the-fracture-resistance-of-mandibular-premolars-with-prefabricated-posts-and-cores
#3
Ae-Ra Kim, Hyun-Pil Lim, Hong-So Yang, Sang-Won Park
PURPOSE: This study evaluated fracture resistance with regard to ferrule lengths and post reinforcement on endodontically treated mandibular premolars incorporating a prefabricated post and resin core. MATERIALS AND METHODS: One hundred extracted mandibular premolars were randomly divided into 5 groups (n=20): intact teeth (NR); endodontically treated teeth (ETT) without post (NP); ETT restored with a prefabricated post with ferrule lengths of either 0 mm (F0), 1 mm (F1), or 2 mm (F2)...
October 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29142558/transpedical-interbody-bone-grafting-in-the-treatment-of-senile-osteoporotic-vertebral-fracture
#4
Zhiwei Qin, Hong Liu, Guiying Chen, Guifeng Liu, Peng Zhang, Haitao Zhu
Objective: To evaluate the clinical effect of transpedical interbody bone grafting in the treatment of senile osteoporotic vertebral fracture. Methods: Eighty-six elders with osteoporotic vertebral fracture were selected and divided into a control group and a test group using random double-blind method. Patients in the control group were treated by short-segment transpedicular screw system internal fixation, while patients in the test group were treated by short-segment transpedicular screw system internal fixation in combination with transpedical interbody bone grafting...
September 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/29141673/a-customized-fixation-plate-with-novel-structure-designed-by-topological-optimization-for-mandibular-angle-fracture-based-on-finite-element-analysis
#5
Yun-Feng Liu, Ying-Ying Fan, Xian-Feng Jiang, Dale A Baur
BACKGROUND: The purpose of this study was to design a customized fixation plate for mandibular angle fracture using topological optimization based on the biomechanical properties of the two conventional fixation systems, and compare the results of stress, strain and displacement distributions calculated by finite element analysis (FEA). METHODS: A three-dimensional (3D) virtual mandible was reconstructed from CT images with a mimic angle fracture and a 1 mm gap between two bone segments, and then a FEA model, including volume mesh with inhomogeneous bone material properties, three loading conditions and constraints (muscles and condyles), was created to design a customized plate using topological optimization method, then the shape of the plate was referenced from the stress concentrated area on an initial part created from thickened bone surface for optimal calculation, and then the plate was formulated as "V" pattern according to dimensions of standard mini-plate finally...
November 15, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29141620/treatment-of-genu-valgum-in-children-by-means-of-temporary-hemiepiphysiodesis-using-eight-plates-short-term-findings
#6
Dirk Zajonz, Eckehard Schumann, Magdalena Wojan, Fabian B Kübler, Christoph Josten, Ulf Bühligen, Christoph E Heyde
BACKGROUND: Idiopathic genu valgum is a frequently diagnosed growth disorder in adolescence. Whenever the possibilities of conservative therapy have been exhausted, leg straightening by means of hemiepiphysiodesis has become the standard form of treatment. Because of their flexible screw-plate connection, eight-Plates have been reported in the literature to lead to lower complications regarding implant loosening and fracture compared to other implants. The aim of this retrospective survey was to analyse our own patient population who were treated for genu valgum by means of temporary hemiepiphysiodesis near the knee using eight-Plates to modulate growth...
November 15, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29141521/incremental-temperature-cement-delivery-technique-may-prevent-cement-leakage-in-metastatic-vertebral-lesions
#7
Hao Liu, Shenghao Wang, Tao Liu, Bin Meng, Fan He, Rong Zhou, Huilin Yang
OBJECTIVES: To analyze the clinical efficacy and cement leakage rate of percutaneous kyphoplasty (PKP) for the treatment of metastatic vertebral lesions between the two groups using different cement infusion techniques. METHODS: One hundred twenty-nine patients (160 metastatic vertebral fractures) who chose "the incremental temperature cement delivery technique" (ITCDT group) and 105 patients (128 metastatic vertebral fractures) who chose "traditional infusion technique" (TI group) were finally enrolled (nine patients were lost to the follow-up)...
September 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/29140292/anisotropic-failure-strength-of-shale-with-increasing-confinement-behaviors-factors-and-mechanism
#8
Cheng Cheng, Xiao Li, Haitao Qian
Some studies reported that the anisotropic failure strength of shale will be weakened by increasing confinement. In this paper, it is found that there are various types of anisotropic strength behaviors. Four types of anisotropic strength ratio ( S A 1 ) behaviors and three types of anisotropic strength difference ( S A 2 ) behaviors have been classified based on laboratory experiments on nine groups of different shale samples. The cohesion c w and friction angle ϕ w of the weak planes are proven to be two dominant factors according to a series of bonded-particle discrete element modelling analyses...
November 15, 2017: Materials
https://www.readbyqxmd.com/read/29136444/effect-of-locking-plate-fixation-vs-intramedullary-nail-fixation-on-6-month-disability-among-adults-with-displaced-fracture-of-the-distal-tibia-the-uk-fixdt-randomized-clinical-trial
#9
Matthew L Costa, Juul Achten, James Griffin, Stavros Petrou, Ian Pallister, Sarah E Lamb, Nick R Parsons
Importance: The best treatment for fractures of the distal tibia remains controversial. Most such fractures require surgical fixation but outcomes are unpredictable and complications are common. Objective: To assess disability, quality of life, and complications in patients with displaced tibial fracture treated with intramedullary nail fixation vs locking plate fixation. Design, Setting, and Participants: A multicenter randomized trial recruiting 321 patients 16 years or older with an acute, displaced, extra-articular fracture of the distal tibia from April 2013 through April 2016 with final follow-up in February 2017...
November 14, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/29135041/risk-factors-for-tibial-damage-associated-with-the-modified-maquet-technique-in-174-stifles
#10
Michael D Lefebvre, Olivier R Broux, Nicolas P Barthélémy, Martin Hamon, Evelyne V Moyse, Bernard M Bouvy, Marc H Balligand
OBJECTIVE: To identify risk factors for tibial damage associated with the modified Maquet technique (MMT) in dogs with cranial cruciate ligament (CCL) disease. STUDY DESIGN: Retrospective study. SAMPLE POPULATION: One hundred and seventy-four stifles from 147 client-owned dogs. METHODS: Medical records of dogs diagnosed with CCL disease and treated with the current version of MMT were reviewed. Dogs were included if immediate postoperative radiographs were available...
November 14, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/29130877/reduction-loss-after-distal-radius-fracture-fixation-with-locked-volar-plates
#11
Michael M Vosbikian, Constantinos Ketonis, Ronald Huang, James A Costanzo, Asif M Ilyas
Distal radius fractures are among the most common injuries in the upper extremity. While many studies have looked at the maintenance of reduction with volar locking plates, there is a paucity of literature comparing the ability of different plates to maintain reduction over time. This study reviews the ability of various plates to maintain radiographic reduction at union after distal radius fracture treatment. Loss of some aspect of fracture reduction was routinely observed following locked volar plating regardless of implant...
October 2017: Journal of Surgical Orthopaedic Advances
https://www.readbyqxmd.com/read/29128913/radiographic-markers-for-measuring-tibial-rotation-based-on-ct-reconstructed-radiographs-an-accuracy-and-feasibility-study
#12
David Hakimian, Amal Khoury, Rami Mosheiff, Meir Liebergall, Yoram A Weil
OBJECTIVES: Malreduction in the axial plane (malrotation) following tibial fracture surgery is often undiagnosed. A few clinical and radiographic methods have been proposed for measuring tibial rotation intraoperatively, yet have failed to match the accuracy of computed tomography (CT). The aim of this study was to develop radiographic tools for future intraoperative assessment of the tibial shaft rotation profile. METHODS: The setting was a laboratory computerized analysis...
November 11, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/29122533/-radiological-outcomes-of-unstable-thoraco-lumbar-fractures-without-neurological-deficit-treated-through-percutaneous-surgery
#13
Rafael Lorente, Alejandro Lorente, Bárbara Rosa, Pablo Palacios, Carlos Barrios
OBJECTIVE: To analyse the radiological outcomes in the long term of unstable thoracic and lumbar fractures treated through percutaneous surgery. MATERIAL AND METHODS: Retrospective review of a series of patients with unstable thoracic and lumbar fractures treated with percutaneous minimally invasive surgery between 2010 and 2015 in three different hospital centres. Six radiological parameters were measured annually during a 2-year period: Fracture angle, kyphotic deformity, sagittal index, percentage of compression, degree of displacement and deformation angle...
November 6, 2017: Neurocirugía
https://www.readbyqxmd.com/read/29122124/anatomical-and-radiological-evaluation-of-less-invasive-stabilisation-system-liss-in-correlation-with-knee-lateral-collateral-ligament-insertion
#14
Florian Freimoser, Stephan Grechenig, Anna Ofenhitzer, Bore Bakota, Mario Staresinic, Christian G Pfeifer
INTRODUCTION: The Less Invasive Stabilisation System (LISS) is an angle-stable plate that enables treatment of distal femoral comminuted and periprosthetic fracture. As it is placed through a minimally-invasive lateral approach, lateral knee pain is a commonly described symptom after its application. This study investigates knee lateral collateral ligament (LCL) iatrogenic injury during LISS plate fixation. A cadaver study was performed and a retrospective radiological investigation with the analysis of its clinical application was conducted to evaluate possible knee LCL damage...
November 2017: Injury
https://www.readbyqxmd.com/read/29122122/scaphoid-screw-placement-under-minimal-radiation-exposure
#15
Gloria M Hohenberger, Uldis Berzins, Bore Bakota, Patrick Holweg, Bernhard Clement, Stephan Grechenig
BACKGROUND: Percutaneous scaphoid fixation through either a volar or dorsal approach has the advantage of minor soft tissue damage compared with ORIF, and faster fracture union compared with conservative treatment. However, this technique demands highly intraoperative reliance on X-ray control, including increased radiation exposure and all associated side effects. PURPOSE: To test the possibility and efficacy of volar percutaneous scaphoid screw placement under minimalradiation exposure...
November 2017: Injury
https://www.readbyqxmd.com/read/29122121/a-biomechanical-comparison-of-four-fixed-angle-dorsal-plates-in-a-finite-element-model-of-dorsally-unstable-radius-fracture
#16
Josip Knežević, Janoš Kodvanj, Fabijan Čukelj, Frane Pamuković, Arsen Pavić
PURPOSE: To compare the finite element models of two different composite radius fracture patterns, reduced and stabilised with four different fixed-angle dorsal plates during axial, dorsal and volar loading conditions. METHODS: Eight different plastic models representing four AO/ASIF type 23-A3 distal radius fractures and four AO/ASIF 23-C2 distal radius fractures were obtained and fixed each with 1 of 4 methods: a standard dorsal non-anatomical fixed angle T-plate (3...
November 2017: Injury
https://www.readbyqxmd.com/read/29113901/efficacy-of-using-intermediate-screws-in-short-segment-fixation-for-thoracolumbar-fractures-a-meta-analysis-of-randomized-controlled-trials
#17
Min-Ji Tong, Qian Tang, Cheng-Gui Wang, Guang-Heng Xiang, Qi Chen, Hua-Zi Xu, Nai-Feng Tian
BACKGROUD: Some studies have reported that the conventional intersegmental pedicle screws (four-screw fixation, '4S') device for thoracolumbar fractures was associated with inadequate reduction of fractured vertebrae, insufficient correction of kyphosis, and implant failure. Recently, a series of biomechanical studies confirmed that the addition of intermediate fixation screws (six- screw fixation, '6S') could provide stronger fixation and better reduction of fractured vertebrae. Nevertheless, the clinical and radiological efficacy of the additional intermediate screws remains unclear...
November 4, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29112917/influence-of-minor-combined-addition-of-cr-and-pr-on-microstructure-mechanical-properties-and-corrosion-behaviors-of-an-ultrahigh-strength-al-zn-mg-cu-zr-alloy
#18
Ming Wang, Lanping Huang, Kanghua Chen, Wensheng Liu
This work focuses on controlling grain boundary structure in an ultra-high strength Al-8.6Zn-2.5Mg-2.2Cu-0.16Zr (wt.%) alloy by the combined addition of trace Cr (0.1wt.%) and Pr (0.14wt.%), and evaluating mechanical properties and localized corrosion behaviors of the alloy in the peak aged condition. The introduction of trace Cr and Pr leads to the formation of nanoscale Cr, Pr-containing Al3Zr and Zr-containing PrCr2Al20 dispersoids which can obviously inhibit the recrystallization and sub-grain growth of the super-high strength Al-Zn-Mg-Cu alloys, and retain the deformation-recovery microstructure dominated by low-angle grain boundaries...
October 26, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29109843/posttraumatic-parotid-sialocele-complicating-a-mandibular-fracture-a-case-report
#19
Jesse Falk, Ryan Borgwardt, Stephen MacLeod
Blunt trauma to the parotid resulting in the formation of a sialocele is rare, with only three cases identified in the literature. We present a unique case involving a 32-year-old man with blunt trauma resulting in a left mandibular angle fracture. The patient underwent open reduction and internal fixation of the left mandibular angle fracture via transoral approach. At follow-up, after resolution of the edema from the injury, a sialocele was noted in the region of the left anterior parotid gland. The patient was treated conservatively with antisialagogues, pressure dressings, and multiple percutaneous aspirations that ultimately resulted in resolution of the sialocele...
December 2017: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/29109821/in-situ-sem-torsion-test-of-metallic-glass-microwires-based-on-micro-robotic-manipulation
#20
Chenchen Jiang, Haojian Lu, Ke Cao, Wenfeng Wan, Yajing Shen, Yang Lu
Microwires, such as metallic, semiconductor, and polymer microwires and carbon fibers, have stimulated great interest due to their importance in various structural and functional applications. Particularly, metallic glass (MG) microwires, because of their amorphous atoms arrangement, have some unique mechanical properties compared with traditional metals. Despite the fact that substantial research efforts have been made on the mechanical characterizations of metallic glass microwires under tension or flexural bending, the mechanical properties of microwires under torsional loading have not been well studied, mainly due to the experimental difficulties, such as the detection of torsion angle, quantitative measurement of the torsional load, and the alignment between the specimen and torque meter...
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