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https://www.readbyqxmd.com/read/28429954/-sternal-resection-for-metachronous-metastasis-from-renal-carcinoma
#1
T Jínek, J Klein, L Adamčík, M Duda, C Vojtek, R Andělová, R Soumarová, M Škrovina
In this report, the authors describe a rare case of complete sternal resection for a metachronous metastasis from renal carcinoma in a 59-year-old female patient 12 years after primary left nephrectomy. Due to the large extent of resection, a polyester double layer mesh with bone cement was used for chest wall reconstruction. The postoperative course was uneventful without any indication for adjuvant treatment. The patient has been followed up for 20 months without any signs of complications and recurrence of her malignancy...
2017: Rozhledy V Chirurgii: Měsíčník Československé Chirurgické Společnosti
https://www.readbyqxmd.com/read/28429365/a-randomized-clinical-trial-about-presence-of-pathogenic-microflora-and-risk-of-peri-implantitis-comparison-of-two-different-types-of-implant-abutment-connections
#2
F Mencio, F De Angelis, P Papi, D Rosella, G Pompa, S Di Carlo
OBJECTIVE: The aim of this in vivo study was to evaluate two different types of implant-abutment connections: screwed connection and cemented connection, analyzing peri-implant bacteria microflora as well as other clinical parameters. PATIENTS AND METHODS: Twenty implants were selected, inserted in 20 patients, 10 with a screwed implant-abutment connection (Group 1) and 10 with a cemented implant-abutment connection (Group 2). The peri-implant microflora was collected, after at least 360 days from the prosthetic rehabilitation, using paper points inserted in peri-implant sulcus for 30 s...
April 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28429363/two-unilateral-puncturation-comparative-analyses-of-multiple-level-fresh-osteoporotic-vertebral-body-compression-fractures-treated-with-percutaneous-vertebroplasty-guided-by-c-arm-fluoroscopy-or-in-senile-patients
#3
J-C Xu, G-H Wu, L-L Zhou, X-J Yang, J-T Liu
OBJECTIVE:  To compare the curative effects of two unilateral puncturation percutaneous vertebroplasty (PVP) for the pain caused by multiple-level osteoporotic vertebral body compression fractures (OVCF) in senile patients. PATIENTS AND METHODS: From June 2008 to November 2014, eighty-nine cases suffering from fresh multiple-level OVCF were randomly divided into experimental group (n=51) and control group (n=38). Patients underwent PVP guided by C-arm fluoroscopy in the prone position...
April 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28427489/effects-of-structural-changes-in-subchondral-bone-on-articular-cartilage-in-a-beagle-dog-model
#4
Dong Yan, Tong Xi Liu, Bao Yue Liu, Ling Wang, Zhan Hua Qian, Xiao Guang Cheng, Kun Cheng Li
OBJECTIVE: Using MR T2-mapping and histopathologic score for articular cartilage to evaluate the effect of structural changes in subchondral bone on articular cartilage. METHODS: Twenty-four male Beagle dogs were randomly divided into a subchondral bone defect group (n = 12) and a bone cement group (n = 12). Models of subchondral bone defectin the medial tibial plateau and subchondral bone filled with bone cement were constructed. In all dogs, the left knee joint was used as the experimental sideand the right knee as the sham side...
March 2017: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/28427315/computational-modeling-of-long-term-effects-of-prophylactic-vertebroplasty-on-bone-adaptation
#5
Sandro D Badilatti, Patrik Christen, Stephen J Ferguson, Ralph Müller
Cement augmentation in vertebrae (vertebroplasty) is usually used to restore mechanical strength after spinal fracture but could also be used as a prophylactic treatment. So far, the mechanical competence has been determined immediately post-treatment, without considering long-term effects of bone adaptation. In this work, we investigated such long-term effects of vertebroplasty on the stiffness of the augmented bone by means of computational simulation of bone adaptation. Using micro-finite element analysis, we determined sites of increased mechanical stress (stress raisers) and stress shielding and, based on the simulations, regions with increased or decreased bone loss due to augmentation...
May 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28426984/biomagnetic-monitoring-and-element-content-of-lichen-transplants-in-a-mixed-land-use-area-of-ne-italy
#6
Danijela Kodnik, Aldo Winkler, Fabio Candotto Carniel, Mauro Tretiach
The aim of this study was to verify whether it is possible to discriminate between the different pollution sources present in a mixed land use area of NE Italy on the basis of the magnetic properties and the element content of lichen transplants. Thalli of Pseudevernia furfuracea were collected in a pristine area of the South-Eastern Alps and exposed for 2months in 40 sites located at the knots of a 700m step grid covering ca. 40km(2) of a mosaic of agricultural, forested, industrial and urban areas. In this way, the samples could be analyzed after a defined period of time, and compared to pre-exposure conditions...
April 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28422598/the-use-of-restorative-materials-in-primary-molars-among-pediatric-dentists-in-israel
#7
Sigalit Blumer, Benjamin Peretz, Tal Ratson
OBJECTIVES: To assess the current choice of various restoration materials among Israeli pediatric dentists according to seniority and specialty. STUDY DESIGN: Participating dentists completed a 23-item questionnaire on their qualifications, type of practice and preference of restorative material. RESULTS: Seventy-five dentists (average age 46.27±12.6 years, 58 females) participated. Forty-one were specialist pediatric dentists and 34 were general practitioners...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28422367/microtensile-bond-strength-of-a-resin-cement-to-silica-based-and-y-tzp-ceramics-using-different-surface-treatments
#8
Alireza Keshvad, Seyed Mohammad Reza Hakimaneh
PURPOSE: To evaluate the effects of different surface treatments on the microtensile bond strength (μTBS) of bonding between resin cement and lithia or zirconia-based ceramics using an in vitro study. MATERIALS AND METHODS: Three zirconia ceramic blocks (IPS e.max ZirCAD) and three lithium disilicate ceramic blocks (IPS e.max CAD) were sintered and duplicated in resin composite. The zirconia specimens underwent various treatments (n = 1): (i) Sandblast + primer (ZiSa); (ii) sandblast + laser irradiation + primer (ZiSaLa); or (iii) laser irradiation + primer (ZiLa)...
April 19, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28421835/symptomatic-tension-pneumocephalus-following-palacos%C3%A2-cranioplasty-in-a-shunted-patient
#9
Tim Killeen, Mathias Fortunati, Esha Myanger, Daniel Rüfenacht, Nurzhan Ryskeldiyev, Serik Akshulakov, Evaldas Cesnulis
Tension pneumocephalus is an exceedingly rare complication of cerebrospinal fluid diversion occurring after surgery, trauma or spontaneous fistula formation. We report a case in a patient with a ventriculoperitoneal shunt who developed symptomatic tension pneumocephalus via a skin defect within 24 hours of undergoing bone cement cranioplasty.
April 19, 2017: British Journal of Neurosurgery
https://www.readbyqxmd.com/read/28420832/effect-of-air-particle-pressures-on-the-surface-topography-and-bond-strengths-of-resin-cement-to-the-hybrid-ceramics
#10
Jong-Eun Kim, Jee-Hwan Kim, June-Sung Shim, Byoung-Duck Roh, Yooseok Shin
This study aimed to determine the appropriate pressure for airborne-abrasion by comparing the shear bond strength values for different hybrid ceramic surfaces. Two materials were used to produce hybrid ceramic specimens: Lava Ultimate and MAZIC Duro. The group of specimens whose surfaces were not subjected to airborne-abrasion was set as the control group. In the experimental group, airborne-abrasion was performed at pressures of 0.1, 0.2, and 0.3 MPa. After the adhesive and resin cement was applied, an SBS test was performed...
April 18, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28418269/is-a-hollow-centralizer-necessary-when-using-a-polished-tapered-cemented-femoral-stem
#11
Erik Weber, Christer Olsson, Uldis Kesteris, Gunnar Flivik
Background and purpose - A tapered, polished and collarless stem is normally equipped with a hollow centralizer to prevent the stem from becoming end-bearing in the cement as the stem subsides. In a randomized clinical trial, we evaluated such a stem (MS-30), which was initially introduced with a solid centralizer but was later recommended to be fitted with a hollow centralizer. We hypothesized that while the stem would sink more, it would become rotationally stable and have less retroversion with a hollow centralizer than with a solid centralizer...
April 18, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28417581/radiopacity-of-resin-cements-using-digital-radiography
#12
Sherif Hosney, Hanan K Abouelseoud, Omar El-Mowafy
STATEMENT OF PROBLEM: Monitoring performance of glass-ceramic based indirect restorations using radiographic imaging might be difficult due to their low radiopacity. Therefore, materials used for their cementation must possess adequate radiopacity. PURPOSE: This study determined radiopacity of a group of resin-cements used for adhesive-cementation of glass-ceramic-based restorations using digital radiography. METHODS: Two specimens were prepared from a group of resin cements (VariolinkII-opaque, VariolinkII-opaque (base), VariolinkII-Transparent, VariolinkII-Transparent (base), Nexus, RelyX Unicem, RelyX ultimate, Duolink, Monocem and Resinomer) and longitudinal sections of same thickness were obtained from molar and premolar...
April 18, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28416837/-clinical-comparison-of-polymethylmethacrylate-and-bone-cement-in-the-treatment-of-osteoporotic-vertebral-compression-fractures-a-retrospective-study
#13
L P Shang, Y Tian, X G Liu
OBJECTIVE: To analyze the outcomes of patients with osteoporotic vertebral compression fractures treated with polymethylmethacrylate (PMMA) and GeneX bone cement in percutaneous kyphoplasty and to provide guidance in selecting the vertebral filling material for this procedure. METHODS: In this study, 86 patients with osteoporotic vertebral compression fractures treated at Peking University Third Hospital between June 2012 and June 2013 were retrospectively analyzed...
April 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28416835/-polymethylmethacrylate-augmentation-of-bone-cement-injectable-cannulated-pedicle-screws-was-used-to-treat-degenerative-lumbar-scoliosis-with-osteoporosis
#14
H L Sun, C D Li, X W Li, X D Yi, H Liu, H L Lu, H Li, Z R Yu, Y Wang
OBJECTIVE: To describe the application of polymethylmethacrylate (PMMA) augmentation of cement-injectable cannulated pedicle screws for the treatment of degenerative lumbar scoliosis with osteoporosis. METHODS: Retrospective cohort study was used to compare cement injectable cannulated pedicle screws (CICPs) group with PMMA augmentation and control group with traditional method in the correction surgery for Lenke-silva level III and level IV degenerative scoliosis cases with osteoporosis...
April 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28416317/zinc-oxide-inhibits-dental-discoloration-caused-by-white-mineral-trioxide-aggregate-angelus
#15
Marina Angélica Marciano, Josette Camilleri, Reginaldo Mendonça Costa, Mariza Akemi Matsumoto, Bruno Martini Guimarães, Marco Antonio Hungaro Duarte
INTRODUCTION: The aim of the study was to investigate the addition of variable amounts of zinc oxide to inhibit dental discoloration caused by mineral trioxide aggregate (MTA) Angelus. METHODS: MTA Angelus and MTA with additions of 5%, 15%, and 45% zinc oxide (ZnO) in weight were tested. The set cements were characterized by using a combination of scanning electron microscopy, energy dispersive spectroscopy, and x-ray diffraction. Radiopacity and setting time were analyzed according to American National Standards Institute/American Dental Association (57/2012) and American Society for Testing and Materials (C266-08)...
April 14, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28415545/engineering-bone-regeneration-with-novel-cell-laden-hydrogel-microfiber-injectable-calcium-phosphate-scaffold
#16
Yang Song, Chi Zhang, Ping Wang, Lin Wang, Chunyun Bao, Michael D Weir, Mark A Reynolds, Ke Ren, Liang Zhao, Hockin H K Xu
Cell-based tissue engineering is promising to create living functional tissues for bone regeneration. The implanted cells should be evenly distributed in the scaffold, be fast-released to the defect and maintain high viability in order to actively participate in the regenerative process. Herein, we report an injectable calcium phosphate cement (CPC) scaffold containing cell-encapsulating hydrogel microfibers with desirable degradability that could deliver cells in a timely manner and maintain cell viability...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415534/influence-of-si-substitution-on-the-reactivity-of-%C3%AE-tricalcium-phosphate
#17
Mariana Motisuke, Gemma Mestres, Caroline O Renó, Raúl G Carrodeguas, Cecília A C Zavaglia, Maria-Pau Ginebra
Silicon substituted calcium phosphates have been widely studied over the last ten years due to their enhanced osteogenic properties. Notwithstanding, the role of silicon on α-TCP reactivity is not clear yet. Therefore, the aim of this work was to evaluate the reactivity and the properties of Si-α-TCP in comparison to α-TCP. Precursor powders have similar properties regarding purity, particle size distribution and specific surface area, which allowed a better comparison of the Si effects on their reactivity and cements properties...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415511/facile-synthesis-and-characterization-of-novel-rapid-setting-spherical-sub-micron-bioactive-glasses-cements-and-their-biocompatibility-in-vitro
#18
Yuli Li, Qiming Liang, Cai Lin, Xian Li, Xiaofeng Chen, Qing Hu
Dental pulp vitality is extremely important for the tooth viability, since it provides nutrition and forms the dentin. Bioactive glasses (BGs) may be promising materials for pulp repair due to their excellent abilities of rapidly bonding to bone and stimulating new bone growth. However, the unsatisfied handling property, low plasticity, and poor rapid-setting property of traditional BGs limit its application in vital pulp therapy. Spherical bioactive glasses (SBGs) exhibited higher osteogenesis and odontogenic differentiation than irregular BGs...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415507/influences-of-doping-mesoporous-magnesium-silicate-on-water-absorption-drug-release-degradability-apatite-mineralization-and-primary-cells-responses-to-calcium-sulfate-based-bone-cements
#19
Zhengrong Gu, Sicheng Wang, Weizong Weng, Xiao Chen, Liehu Cao, Jie Wei, Jung-Woog Shin, Jiacan Su
In this study, composite cements containing mesoporous magnesium silicate (m-MS) and calcium sulfate (CS) were fabricated. The results revealed that the setting time of the m-MS/CS composite cements (m-MSC) slightly prolonged with the increase of m-MS content while the compressive strength suffered a little loss. The doping of m-MS improved the water absorption, drug release (vancomycin) and degradability of the m-MSC in Tris-HCl solution (pH=7.4). In addition, addition of m-MS facilitated the apatite-mineralization of m-MSC in simulated body fluid (SBF), indicating good bioactivity...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415505/a-new-method-to-produce-macroporous-mg-phosphate-bone-growth-substitutes
#20
Elham Babaie, Boren Lin, Sarit B Bhaduri
This paper is a sequel to our previous effort in developing Mg-phosphate orthopedic cements using amorphous Mg-phosphate (AMP) as the precursor. In this paper, we report a new real-time in situ technique to create macroporous bone growth substitute (BGS). The method uses biodegradable Mg-particles as the porogen. As opposed to the conventional wisdom of providing corrosion protection layers to biodegradable Mg-alloys, the present method uses the fast corrosion kinetics of Mg to create macropores in real time during the setting of the cement...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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