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https://www.readbyqxmd.com/read/28110407/in-vitro-performance-of-cad-cam-fabricated-implant-supported-temporary-crowns
#1
Martin Rosentritt, Philipp Raab, Sebastian Hahnel, Matthias Stöckle, Verena Preis
OBJECTIVES: The aim of this study was to investigate the in-vitro performance and fracture resistance of a temporary computer-aided designed and computer-aided manufactured polymethylmethacrylate (CAD/CAM-PMMA) material as implant or tooth-supported single crown with respect to the clinical procedure (permanently bonded/temporarily cemented). MATERIALS AND METHODS: Sixty-four crowns were fabricated on implants or human molar teeth simulating (a) labside procedure on prefabricated titanium-bonding base ([TiBase] implant crown bonded in laboratory, screwed chairside), (b) labside procedure ([LAB] standard abutment and implant crown bonded in laboratory, screwed chairside), (c) chairside procedure ([CHAIR] implant crown bonded to abutment), and (d) reference ([TOOTH] crowns luted on prepared human teeth)...
January 21, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28110324/setting-kinetics-and-mechanical-properties-of-flax-fibre-reinforced-glass-ionomer-restorative-materials
#2
Abou Neel Ensanya Ali, Young Anne M
Regardless of the excellent properties of glass ionomer cements, their poor mechanical properties limit their applications to non-load bearing areas. This study aimed to investigate the effect of incorporated short, chopped and randomly distributed flax fibers (0, 0.5, 1, 2.5, 5 and 25 wt%) on setting reaction kinetics, and mechanical and morphological properties of glass ionomer cements. Addition of flax fibers did not significantly affect the setting reaction extent. According to their content, flax fibers increased the compressive (from 148 to 250 MPa) and flexure strength (from 20 to 42 MPa)...
October 17, 2016: Journal of Biomedical Research
https://www.readbyqxmd.com/read/28109761/survivorship-of-metaphyseal-sleeves-in-revision-total-knee-arthroplasty
#3
Brian P Chalmers, Nicholas M Desy, Mark W Pagnano, Robert T Trousdale, Michael J Taunton
BACKGROUND: Metaphyseal fixation has promising early results in providing component stability and fixation in revision total knee arthroplasty (TKA). However, there are limited studies on midterm results of metaphyseal sleeves. We analyzed complications, rerevisions, and survivorship free of revision for aseptic loosening of metaphyseal sleeves in revision TKA. METHODS: Two hundred eighty patients with 393 metaphyseal sleeves (144 femoral, 249 tibial) implanted during revision TKA from 2006-2014 were reviewed...
December 14, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28108959/innovative-root-end-filling-materials-based-on-calcium-silicates-and-calcium-phosphates
#4
Ali Abedi-Amin, Arlinda Luzi, Massimo Giovarruscio, Gaetano Paolone, Atanaz Darvizeh, Victoria Vivó Agulló, Salvatore Sauro
This in vitro study evaluated the apical sealing ability, bioactivity and biocompatibility of an experimental calcium silicate-based and two light-curing calcium silicate/calcium-phosphate cements as potential root end filling materials. A calcium silicate Portland-based (Control PC), an experimental calcium silicate (Exp. PC) and two light-curing cements (LC-CaP; LC-Si/CaP) were assessed for their alkalinising activity (pH) and biocompatibility. Single-rooted human canines were endodontically treated, filled with gutta-percha and finally submitted to apicoectomy...
February 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28108780/cement-augmented-screws-in-a-cervical-two-level-corpectomy-with-anterior-titanium-mesh-cage-reconstruction-a-biomechanical-study
#5
Sebastian Hartmann, Claudius Thomé, Anja Tschugg, Johannes Paesold, Pujan Kavakebi, Werner Schmölz
STUDY DESIGN: Biomechanical investigation. PURPOSE: Cervical two-level corpectomies with anterior-only instrumentation are associated with a high rate of implant-related complications. These procedures, therefore, often require an additional dorsal instrumentation to prevent screw loosening. Cement augmentation of the anterior screws in two-level corpectomies might stabilize the construct, so that a second dorsal procedure could be avoided. To evaluate the screw anchorage in cervical anterior-only procedures, an ex vivo evaluation of the range of motion (ROM) in two-level corpectomies (C4 and C5), with and without cement augmentation of the anterior screws, was carried out in this study...
January 21, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28108403/risk-of-cement-leakage-and-pulmonary-embolism-by-bone-cement-augmented-pedicle-screw-fixation-of-the-thoracolumbar-spine
#6
Insa Janssen, Yu-Mi Ryang, Jens Gempt, Stefanie Bette, Julia Gerhardt, Jan Kirschke, Bernhard Meyer
BACKGROUND: Cement augmented pedicle screw instrumentation (CAPSI) of the thoracolumbar spine is indicated in osteoporosis or osteopenia to improve pullout strength and biomechanical stability of pedicle screws (PS). Only few studies report on the incidence of pulmonary cement embolism or other complications associated with CAPSI. PURPOSE: Aim of this retrospective study was to assess the rate of CAPSI associated complications. STUDY DESIGN: Retrospective cohort study...
January 17, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28107712/innovative-solidification-stabilization-of-lead-contaminated-soil-using-incineration-sewage-sludge-ash
#7
Jiangshan Li, Chi Sun Poon
The proper treatment of lead (Pb) contaminated soils and incinerated sewage sludge ash (ISSA) has become an environmental concern. In this study, ordinary Portland cement (OPC) and blended OPC containing incinerated sewage sludge ash (ISSA) were used to solidify/stabilize (S/S) soils contaminated with different concentrations of Pb. After curing for 7 and 28 d, the S/S soils were subjected to a series of strength, leaching and microscopic tests. The results showed that replacement of OPC by ISSA significantly reduced the unconfined compressive strength (UCS) of S/S soils and leached Pb...
January 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28107240/an-in-vitro-evaluation-of-fracture-reduction-achieved-by-inflatable-bone-tamps-under-simulated-physiological-load
#8
Michael Gordon, Walter C Peppelman, William Beutler, Damien OʼHalloran, Suresh R Chinthakunta, Brandon Bucklen
STUDY DESIGN: An in vitro biomechanical study. OBJECTIVE: To determine the fracture reduction achieved by a novel inflatable bone tamp under simulated physiological load. SUMMARY OF BACKGROUND DATA: Previous biomechanical studies have showed that kyphoplasty allows near-total restoration of lost vertebral height in unloaded conditions and partial height restoration under simulated physiological loads. Clinically, loss of reduction has been observed after bone tamp deflation, before cement injection...
February 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28107234/comparison-between-acrylic-cage-and-polyetheretherketone-peek-cage-in-single-level-anterior-cervical-discectomy-and-fusion-a-randomized-clinical-trial
#9
Majid R Farrokhi, Zahra Nikoo, Mehrnaz Gholami, Khadijeh Hosseini
STUDY DESIGN: Prospective, single-blind randomized-controlled clinical study. OBJECTIVE: To compare polyetheretherketone (PEEK) cage with a novel Acrylic cage to find out which fusion cage yielded better clinical outcomes following single-level anterior cervical discectomy and fusion (ACDF). SUMMARY OF BACKGROUND DATA: ACDF is considered a standard neurosurgical treatment for degenerative diseases of cervical intervertebral disks. There are many options, including bone grafts, bone cement, and spacers made of titanium, carbon fiber, and synthetic materials, used to restore physiological disk height and enhance spinal fusion, but the ideal device, which would provide immediate structural support and subsequent osteointegration and stability, has not been identified yet...
February 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28106935/effects-of-luting-composites-on-the-resultant-colors-of-ceramic-veneers-to-intended-shade-tab
#10
Qing Li
PURPOSE: To investigate the color differences of ceramic veneers and the intended shade tab, and evaluate the effects of luting composites on the resultant colors of ceramic veneers. MATERIALS AND METHODS: Pressable leucite-reinforced feldspathic ceramic discs (IPS e.max), with nominal shade A3, were fabricated with thicknesses of 1.0 mm, 0.7 mm, and 0.5 mm (n = 10/ thickness). The ceramic specimens were cemented onto a composite background (shade Dentin) using a veneer adhesive system with five colors of luting composites (RelyX)...
January 20, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28106231/a-case-control-study-of-cemented-acetabular-total-hip-arthroplasty-components-in-patients-less-than-50-with-5-year-minimum-follow-up
#11
Thomas F M Yeoman, William Smy, Paul Gaston
BACKGROUND: This study investigates the outcomes of cemented sockets in young patients (<50 years) requiring a total hip replacement (THR) compared to older patients (>50 years) having the same procedure, under the same surgeon between June 2005 and May 2009. METHODS: Prosthesis survivorship rates, patient outcomes and radiological findings were compared between a consecutive series of 56 young patients (mean 42, range 25-49) and 56 older patients (mean 69, range 53-81) that underwent a primary THR using a cemented Stryker® Exeter™ Contemporary™ flanged cup...
January 20, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/28103308/results-after-cementless-medial-oxford-unicompartmental-knee-replacement-incidence-of-radiolucent-lines
#12
Benjamin Panzram, Ines Bertlich, Tobias Reiner, Tilman Walker, Sébastien Hagmann, Marc-André Weber, Tobias Gotterbarm
PURPOSE: Tibial radiolucent lines (RL) are commonly seen in cemented unicompartmental knee replacement (UKR). In the postoperative course, they can be misinterpreted as signs of loosening, thus leading to unnecessary revision. Since 2004, a cementless OUKR is available. First studies and registry data have shown equally good clinical results of cementless OUKR compared to the cemented version and a significantly reduced incidence of RL in cementless implants. METHODS: This single-centre retrospective cohort study includes the first 30 UKR (27 patients) implanted between 2007 and 2009 with a mean follow-up of 5 years...
2017: PloS One
https://www.readbyqxmd.com/read/28102922/effect-of-the-unfilled-space-size-of-the-abutment-screw-access-hole-on-the-extruded-excess-cement-and-retention-of-single-implant-zirconia-crowns
#13
Sulieman S Al-Johany, Mohammad D Al Amri, Ahmed S Al-Bakri, Mohammed N Al-Qarni
PURPOSE: To evaluate in vitro the effect of the size of the unfilled space of the abutment screw access hole on the amount of extruded excess cement and the retention of zirconia copings. MATERIALS AND METHODS: Twelve dental implant replicas were attached to the corresponding abutments and embedded in acrylic resin blocks. A total of 36 CAD/CAM zirconia copings were fabricated by one technician using the standard technique. Abutments were divided into group I: the entire screw access channel was completely filled (nonspaced); group II: 1-mm-spaced; and group III: 2-mm-spaced...
January 19, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28102450/hidden-blood-loss-and-the-influential-factors-after-percutaneous-kyphoplasty-surgery
#14
Yao-Sen Wu, Hui Zhang, Wen-Hao Zheng, Zhen-Hua Feng, Ze-Xin Chen, Yan Lin
PURPOSE: Percutaneous kyphoplasty (PKP) is a minimally invasive procedure for the treatment of osteoporotic vertebral compression fractures (OVCFs). It is generally considered that there is little blood loss during the surgery. However, a significant perioperative hidden blood loss (HBL) is neglected. This study was to examine the amount of HBL and determine the influential factors during PKP. METHODS: From January 2015 to January 2016, 115 patients with OVCFs who were scheduled to have a PKP were enrolled in this study...
January 19, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28102000/bone-regeneration-in-minipigs-via-calcium-phosphate-cement-scaffold-delivering-autologous-bmscs-and-platelet-rich-plasma
#15
Gengtao Qiu, Zhanjun Shi, Hockin H K Xu, Bo Yang, Michael D Weir, Guangjun Li, Yang Song, Jixing Wang, Kevin Hu, Ping Wang, Liang Zhao
Macroporous calcium phosphate cement (CPC) with stem cell seeding is promising for bone regeneration. The objective of this study was to investigate the effects of co-delivering autologous bone marrow mesenchymal stem cells (BMSCs) and autologous platelet-rich plasma (PRP) in CPC scaffold for bone regeneration in minipigs for the first time. Twelve female adult Tibet minipigs (12-18 months old) were used. A cylindrical defect with 10 mm height and 8 mm diameter was prepared at the femoral condyle. Two bone defects were created in each minipig, one at each side of the femoral condyle...
January 18, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28101655/percutaneous-vertebral-augmentation-in-fragility-fractures-indications-and-limitations
#16
O Gonschorek, S Hauck, T Weiß, V Bühren
INTRODUCTION: There is still no general consensus about the management of osteoporotic vertebral fractures. Recommendations depend on type of fracture, grade of instability, bone quality, and general conditions of the patient. Spontaneous fractures may be considered to be treated different compared to cases with high-velocity trauma. METHODS: According to the DVO, patients without trauma should first be treated conservatively. However, there is no more strict time protocol of 3 or 6 week conservative treatment before operations may be indicated...
January 18, 2017: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/28101445/comparison-of-percutaneous-vertebroplasty-with-and-without-interventional-tumor-removal-for-spinal-metastatic-tumor-without-epidural-involvement
#17
Yan Su, Zhong-Zhen Sun, Long-Xiang Shen, Jian Ding, Zheng-Yu Xu, Yi-Min Chai, Wen-Qi Song, Dong Chen, Chun-Gen Wu
AIM: To evaluate the efficacy of percutaneous vertebroplasty (PVP) combined with interventional tumor removal (ITR) in providing pain relief, reducing disability, and improving functional performance in patients with malignant vertebral compression fractures without epidural involvement. METHODS: Patients with malignant vertebral compression fractures (n=58) were treated with either PVP+ITR (n=31, group A) or PVP alone (n=27, group B). A 14 G needle was inserted into the vertebral body, and the tract was sequentially dilated with working cannulae...
March 2017: Journal of Bone Oncology
https://www.readbyqxmd.com/read/28100024/evaluation-of-cast-re-orientation-on-a-dental-surveyor-using-three-tripod-techniques-a-survey-and-in-vitro-study
#18
Mohammed E Sayed, Idris A Busaily, Rana J Nahari, Ruaa O Hakami, Sami M Maashi, Naveen R Ramireddy
PURPOSE: To survey different educational levels (i.e., students, interns, technicians, and prosthodontic faculty) with regard to their opinions, attitudes, and adoption of three selected tripod techniques. The study will also investigate the accuracy of these techniques to reposition casts on the dental surveyor in anterio-posterior (AP) and lateral directions at both technique and educational levels. MATERIALS AND METHODS: Tripod points, scored lines, and cemented post tripod techniques were used in this study...
January 18, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28098961/angiogenic-and-osteogenic-regeneration-in-rats-via-calcium-phosphate-scaffold-and-endothelial-cell-coculture-with-hbmscs-hucmscs-hipsc-mscs-and-hesc-mscs
#19
Wenchuan Chen, Xian Liu, Qianmin Chen, Chongyun Bao, Liang Zhao, Zhimin Zhu, Hockin H K Xu
Angiogenesis is a limiting factor in regenerating large bone defects. The objective of this study was to investigate angiogenic and osteogenic effects of coculture on calcium phosphate cement (CPC) scaffold using human umbilical vein endothelial cells (hUVECs) and mesenchymal stem cells (MSCs) from different origins for the first time. hUVECs were cocultured with four types of cells: human umbilical cord MSCs (hUCMSCs), human bone marrow MSCs (hBMSCs), and MSCs from induced pluripotent stem cells (hiPSC-MSCs) and embryonic stem cells (hESC-MSCs)...
January 18, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28098926/relevance-of-osteoclast-specific-enzyme-activities-in-cell-based-in-vitro-resorption-assays
#20
A Bernhardt, K Koperski, M Schumacher, M Gelinsky
Cell-based in vitro resorption assays are an important tool to simulate the in vivo biodegradation of resorbable bone graft materials and to predict their clinical performance. The present study analyses the activity of osteoclast-specific enzymes as potential surrogate measures for classical pit assay, which is not applicable on irregular structured materials. Osteoclasts derived from human peripheral blood mononuclear cells were cultivated on different surfaces: calcium phosphate bone cements (CPC), dentin discs, osteoblast-derived extracellular matrix (ECM) and tissue culture polystyrene as control...
January 18, 2017: European Cells & Materials
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