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https://www.readbyqxmd.com/read/28801178/impact-of-head-and-neck-radiotherapy-on-the-mechanical-behavior-of-composite-resins-and-adhesive-systems-a-systematic-review
#1
REVIEW
Cristhian Camilo Madrid Troconis, Alan Roger Santos-Silva, Thaís Bianca Brandão, Marcio Ajudarte Lopes, Mario Fernando de Goes
OBJECTIVES: To analyze the evidence regarding the impact of head and neck radiotherapy (HNRT) on the mechanical behavior of composite resins and adhesive systems. METHODS: Searches were conducted on PubMed, Embase, Scopus and ISI Web of Science databases using "Radiotherapy", "Composite resins" and "Adhesive systems" as keywords. Selected studies were written in English and assessed the mechanical behavior of composite resins and/or adhesive systems when bonding procedure was conducted before and/or after a maximum radiation dose ≥50Gy, applied under in vitro or in vivo conditions...
August 8, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28791830/zirconium-the-material-of-the-future-in-modern-implantology
#2
REVIEW
Paweł Kubasiewicz-Ross, Marzena Dominiak, Tomasz Gedrange, Ute U Botzenhart
The authors present the contemporary state of knowledge concerning alternative materials for dental implantology. First of all, factors influencing osseointegration are stated. The most important factors seem to be the type of implant surface. Among the numerous parameters describing them, the most important are: average roughness and porous density. Some studies proved that materials with comparable surface roughness provide similar osseointegration. In modern implantology titanium is the material still considered as a "gold standard"...
May 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28782831/customized-degradable-functionally-graded-scaffold-for-potential-treatment-of-early-stage-osteonecrosis-of-the-femoral-head
#3
Toshiyuki Kawai, Yaser Shanjani, Saba Fazeli, Anthony W Behn, Yaichiro Okuzu, Stuart B Goodman, Yunzhi P Yang
Osteonecrosis of the femoral head (ONFH) is a debilitating disease that results in progressive collapse of the femoral head and subsequent degenerative arthritis. Few treatments provide both sufficient mechanical support and biological cues for regeneration of bone and vascularity when the femoral head is still round and therefore salvageable. We designed and 3D printed a functionally-graded scaffold (FGS) made of polycaprolactone (PCL) and β-tricalcium phosphate (β-TCP) with spatially controlled porosity, degradation and mechanical strength properties to reconstruct necrotic bone tissue in the femoral head...
August 7, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28781913/nursing-review-section-of-surgical-neurology-international-evaluation-of-cervical-disc-disease-and-when-surgery-is-warranted
#4
REVIEW
Nancy E Epstein, Renee D Hollingsworth
BACKGROUND: Patients with cervical disc disease may present with radiculopathy (root compression), myelopathy (cord compression), or myeloradiculopathy. These complaints must be correlated with x-ray, magnetic resonance (MR) imaging, and computed tomographic (CT) scans. Although most patients can be managed nonsurgically, those with significant neurological deficits and larger disc herniations may require surgery. METHODS: The symptoms of cervical radiculopathy include pain radiating down one or both arms, while myelopathy may result in more diffuse numbness tingling or weakness in the upper and/or lower extremities...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28772682/study-of-the-corrosion-resistance-of-austenitic-stainless-steels-during-conversion-of-waste-to-biofuel
#5
Marina Cabrini, Sergio Lorenzi, Tommaso Pastore, Simone Pellegrini, Mauro Burattini, Roberta Miglio
The paper deals with the corrosion behavior of stainless steels as candidate materials for biofuel production plants by liquefaction process of the sorted organic fraction of municipal solid waste. Corrosion tests were carried out on AISI 316L and AISI 304L stainless steels at 250 °C in a batch reactor during conversion of raw material to bio-oil (biofuel precursor), by exposing specimens either to water/oil phase or humid gas phase. General corrosion rate was measured by weight loss tests. The susceptibility to stress corrosion cracking was evaluated by means of U-bend specimens and slow stress rate tests at 10(-6) or 10(-5) s(-1) strain rate...
March 22, 2017: Materials
https://www.readbyqxmd.com/read/28766850/efficacy-of-a-novel-swallowing-exercise-program-for-chronic-dysphagia-in-long-term-head-and-neck-cancer-survivors
#6
Sophie A C Kraaijenga, Lisette van der Molen, Martijn M Stuiver, Robert P Takes, Abrahim Al-Mamgani, Michiel W M van den Brekel, Frans J M Hilgers
BACKGROUND: The efficacy of rehabilitative exercises for chronic dysphagia treatment in head and neck cancer survivors has not been studied extensively and is ambiguous. METHODS: A prospective clinical phase II study using an intensive strength training program was carried out in 17 head and neck cancer survivors with chronic dysphagia. Both swallow and nonswallow exercises were performed for 6-8 weeks with a newly developed tool allowing for progressive muscle overload, including chin tuck, jaw opening, and effortful swallow exercises...
August 2, 2017: Head & Neck
https://www.readbyqxmd.com/read/28763027/experimental-investigation-on-the-joining-of-aluminum-alloy-sheets-using-improved-clinching-process
#7
Chao Chen, Shengdun Zhao, Xiaolan Han, Xuzhe Zhao, Tohru Ishida
Aluminum alloy sheets have been widely used to build the thin-walled structures by mechanical clinching technology in recent years. However, there is an exterior protrusion located on the lower sheet and a pit on the upper sheet, which may restrict the application of the clinching technology in visible areas. In the present study, an improved clinched joint used to join aluminum alloy sheets was investigated by experimental method. The improved clinching process used for joining aluminum alloy evolves through four phases: (a) localized deformation; (b) drawing; (c) backward extrusion; and (d) mechanical interlock forming...
August 1, 2017: Materials
https://www.readbyqxmd.com/read/28753688/the-role-of-neck-muscle-activities-on-the-risk-of-mild-traumatic-brain-injury-in-american-football
#8
Xin Jin, Zhaoying Feng, Valerie Mika, Haiyan Li, David C Viano, King H Yang
Concussion, or mild traumatic brain injury (mTBI), is frequently associated with sports activities. It has generally been accepted that neck strengthening exercises are effective as a preventive strategy for reducing sports-related concussion risks. However, the interpretation of the link between neck strength and concussion risks remains unclear. In this study, a typical helmeted head-to-head impact in American football was simulated using the head and neck complex finite element (FE) model. The impact scenario selected was previously reported in lab-controlled incident reconstructions from high-speed video footages of the National Football League using two head-neck complexes taken from Hybrid III dummies...
October 1, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28750953/a-concise-rehabilitation-protocol-for-sub-acute-and-chronic-non-specific-neck-pain
#9
Pardis Noormohammadpour, Fereshte Tayyebi, Mohammad Ali Mansournia, Elham Sharafi, Ramin Kordi
There is increasing evidence in support of multidisciplinary approaches for management of chronic neck pain. Although presence of different team members is one of the strengths of these approaches, it can limit the access to these treatments. The main objective of this study is designing and investigating the efficacy of a concise rehabilitation program. Thirty-nine patients with sub-acute and chronic non-specific neck pain underwent an 8-week rehabilitation program. Baseline and 8 weeks' follow-up data regarding neck pain (visual analog scale, neck disability index and quality of life) were compared using paired T test...
July 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28750588/efficacy-of-strength-training-on-tension-type-headache-a-randomised-controlled-study
#10
Bjarne K Madsen, Karen Søgaard, Lars L Andersen, Birte Tornøe, Rigmor H Jensen
Background Strength training has shown effects in reducing neck pain. As neck pain is highly prevalent in tension-type headache (TTH), it is relevant to examine the effect of strength training of the shoulder muscles on TTH patients. Aim To examine the effect of strength training of the shoulder/neck muscles on TTH frequency and duration. Methods Sixty patients with TTH were randomised into strength training or a control group. The strength training group trained ten weeks with elastic resistance bands. The control group performed ergonomic and posture correction...
January 1, 2017: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/28746487/fracture-strength-of-orthodontic-mini-implants
#11
Tatiana Feres Assad-Loss, Flávia Mitiko Fernandes Kitahara-Céia, Giordani Santos Silveira, Carlos Nelson Elias, José Nelson Mucha
Objective: This study aimed at evaluating the design and dimensions of five different brands of orthodontic mini-implants, as well as their influence on torsional fracture strength. Methods: Fifty mini-implants were divided into five groups corresponding to different manufactures (DEN, RMO, CON, NEO, SIN). Twenty-five mini-implants were subjected to fracture test by torsion in the neck and the tip, through arbors attached to a Universal Mechanical Testing Machine...
May 2017: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/28746125/comparison-of-pedicle-screw-fixation-strength-among-different-transpedicular-trajectories-a-finite-element-study
#12
Keitaro Matsukawa, Yoshiyuki Yato, Richard A Hynes, Hideaki Imabayashi, Naobumi Hosogane, Yasuo Yoshihara, Takashi Asazuma, Koichi Nemoto
STUDY DESIGN: Comparative biomechanical study by finite element (FE) method. OBJECTIVE: To investigate the pullout strength of pedicle screws using different insertional trajectories. SUMMARY OF BACKGROUND DATA: Pedicle screw fixation has become the gold standard for spinal fusion, however, not much has been done to clarify how the fixation strength of pedicle screws are affected by insertional trajectories and bone properties. MATERIALS AND METHODS: Three-dimensional FE models of 20 L4 vertebrae were constructed from the computed tomographic data...
August 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28744112/strontium-ranelate-treatment-in-a-postmenopausal-woman-with-osteonecrosis-of-the-jaw-after-long-term-oral-bisphosphonate-administration-a-case-report
#13
Whei-Lin Pan, Pi-Lun Chen, Cho-Ying Lin, Yi-Chun Pan, Yuh-Ren Ju, Chiu-Po Chan, Robert Ww Hsu
Bisphosphonates (BPs) suppress bone resorption and increase bone strength, thus reducing the risk of fracture. Oral BPs are widely used for the prevention and treatment of osteoporosis and osteopenia. Here, we describe the case of a postmenopausal woman who took oral alendronate for >3 years for osteoporosis. The patient presented at the clinic with sharp jaw pain and swelling on the left mandible 4 months after extraction of the third molar. Clinical examinations identified an inflamed mucosal opening with pus over an area of necrotic bone...
2017: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/28740036/increased-serum-25-oh-d3-levels-in-post-menopausal-japanese-women-with-osteoporosis-after-3-year-bisphosphonate-treatment
#14
Yukio Nakamura, Shigeharu Uchiyama, Mikio Kamimura, Shota Ikegami, Masatoshi Komatsu, Hiroyuki Kato
Osteoporosis is characterized by the systemic impairment of bone mass, strength, and microarchitecture, leading to an increased risk of fragility fracture. Bisphosphonates (BPs) are the first-line drugs for osteoporosis. Vitamin D is considered to be essential for osteoporotic treatment. However, long-term effects of BPs on the serum levels of 25-hydroxyvitamin D3 (25(OH)D3) are unknown. Accordingly, in this retrospective study, we collected clinical data of 41 post-menopausal Japanese women with osteoporosis treated with BP for over 3 years, without vitamin D supplementation...
July 2017: Tohoku Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28739416/comparison-of-non-invasive-assessments-of-strength-of-the-proximal-femur
#15
Fjola Johannesdottir, Erica Thrall, John Muller, Tony M Keaveny, David L Kopperdahl, Mary L Bouxsein
It is not clear which non-invasive method is most effective for predicting strength of the proximal femur in those at highest risk of fracture. The primary aim of this study was to compare the abilities of dual energy X-ray absorptiometry (DXA)-derived aBMD, quantitative computed tomography (QCT)-derived density and volume measures, and finite element analysis (FEA)-estimated strength to predict femoral failure load. We also evaluated the contribution of cortical and trabecular bone measurements to proximal femur strength...
July 21, 2017: Bone
https://www.readbyqxmd.com/read/28735950/associations-between-clinical-diagnostic-criteria-and-pretreatment-patient-reported-outcomes-measures-in-a-prospective-observational-cohort-of-patients-with-neurogenic-thoracic-outlet-syndrome
#16
Joshua Balderman, Katherine Holzem, Beverly J Field, Michael M Bottros, Ahmmad A Abuirqeba, Chandu Vemuri, Robert W Thompson
OBJECTIVE: Neurogenic thoracic outlet syndrome (NTOS) is caused by dynamic compression of the brachial plexus at the level of the supraclavicular scalene triangle or the subcoracoid (pectoralis minor) space, or both. The purpose of this study was to characterize relationships between 14 clinical diagnostic criteria (CDC) and seven pretreatment patient-reported outcomes measures (PROMs) in a prospective cohort of patients with NTOS. METHODS: There were 183 new patient referrals between July 1 and December 31, 2015, with 150 (82%) meeting an established set of predefined CDC for NTOS...
August 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28729308/the-effect-of-combined-resistance-exercise-training-and-vitamin-d3-supplementation-on-musculoskeletal-health-and-function-in-older-adults-a-systematic-review-and-meta-analysis
#17
Anneka Elizabeth Antoniak, Carolyn A Greig
OBJECTIVES: In older adults, there is a blunted responsiveness to resistance training and reduced muscle hypertrophy compared with younger adults. There is evidence that both exercise training and vitamin D supplementation may benefit musculoskeletal health in older adults, and it is plausible that in combination their effects may be additive. The aim of this systematic review was to evaluate the effectiveness of combined resistance exercise training and vitamin D3 supplementation on musculoskeletal health in older adults...
July 20, 2017: BMJ Open
https://www.readbyqxmd.com/read/28722129/bone-strength-estimated-by-micro-finite-element-analysis-%C3%A2%C2%B5fea-is-heritable-and-shares-genetic-predisposition-with-areal-bmd-the-framingham-study
#18
David Karasik, Serkalem Demissie, Darlene Lu, Kerry E Broe, Steven K Boyd, Ching-Ti Liu, Yi-Hsiang Hsu, Mary L Bouxsein, Douglas P Kiel
Genetic factors contribute to the risk of bone fractures, partly because of effects on bone strength. High-resolution peripheral quantitative computed tomography (HR-pQCT) estimates bone strength using micro-finite element analysis (µFEA). The goal of this study was to investigate if the bone failure load estimated by HR-pQCT-based µFEA is heritable and to what extent it shares genetic regulation with areal bone mineral density (aBMD). Bone microarchitecture was measured by HR-pQCT at the ultradistal tibia and ultradistal radius in adults from the Framingham Heart Study (n = 1087, mean age 72 years; 57% women)...
July 19, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28714658/the-effect-of-progressive-shoulder-neck-exercise-on-cervical-muscle-functions-of-middle-aged-and-senior-patients-with-chronic-neck-pain-a-randomized-controlled-trial
#19
I Hsien Lin, Kwang H Chang, Tsan H Liou, Chih M Tsou, Yi C Huang
BACKGROUNDː Although neck pain is a common musculoskeletal disorder, there is no consensus on suitable exercise methods for middle-aged and senior patients with chronic neck pain. Therefore, this study investigated the effectiveness of a 6-week shoulder-neck exercise intervention program on cervical muscle function improvement in ≥45-year old patients with chronic neck pain. AIM: To evaluated the effects of progressive shoulder-neck exercise on cervical muscle functions of middle-aged and senior patients with chronic neck pain...
July 17, 2017: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28712877/bone-mass-microarchitecture-and-strength-are-influenced-by-race-ethnicity-in-young-adult-men-and-women
#20
Kristin L Popp, Julie M Hughes, Adriana Martinez-Betancourt, Matthew Scott, Victoria Turkington, Signe Caksa, Katelyn I Guerriere, Kathryn E Ackerman, Chun Xu, Ginu Unnikrishnan, Jaques Reifman, Mary L Bouxsein
Lower rates of fracture in both Blacks compared to Whites, and men compared to women are not completely explained by differences in bone mineral density (BMD). Prior evidence suggests that more favorable cortical bone microarchitecture may contribute to reduced fracture rates in older Black compared to White women, however it is not known whether these differences are established in young adulthood or develop during aging. Moreover, prior studies using high-resolution pQCT (HR-pQCT) have reported outcomes from a fixed-scan location, which may confound sex- and race/ethnicity-related differences in bone structure...
July 13, 2017: Bone
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