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https://www.readbyqxmd.com/read/28107757/piezosurgery-a-safe-technique-for-inferior-alveolar-nerve-mobilization-in-surgical-correction-of-hemimandibular-hyperplasia-review-of-the-literature-and-case-report
#1
Amel S Eltayeb, Abdelnasir G Ahmad
INTRODUCTION: Piezoelectric bone surgery is a relatively new alternative for bone-related procedures in oral and maxillofacial surgery. It represents an innovative technique as it offers the maxillofacial surgeon the opportunity to make precise bone cuts without damaging any soft tissue and providing a blood less surgical field. Correction of facial asymmetries is still a major problem in need of an adequate solution. Neurosensory damage to the inferior alveolar nerve can be an adverse effect of surgical correction of hemimandibular hyperplasia...
December 30, 2016: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28107676/characterization-of-a-new-ultrasound-device-designed-for-measuring-cortical-porosity-at-the-human-tibia-a-phantom-study
#2
M Gräsel, C-C Glüer, R Barkmann
Quantitative ultrasound (QUS) measurements of trabecular bone are a useful tool for the assessment of osteoporotic fracture risk. However, cortical bone properties (e.g. porosity) have an impact on bone strength as well and thus current research is focused on QUS assessment of cortical bone properties. Simulation studies of ultrasound propagation through cortical bone indicate that anisotropy, calculated from the ratio of the velocities in axial and tangential directions, is correlated with porosity. However, this relationship is affected by error sources, specifically bone surface curvature and variability of probe positioning...
January 4, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28097725/increased-cortical-porosity-in-women-with-hip-fracture
#3
D Sundh, A G Nilsson, M Nilsson, L Johansson, D Mellström, M Lorentzon
BACKGROUND: Hip fractures cause increased mortality and disability and consume enormous healthcare resources. Only 46% of hip fracture patients have osteoporosis at the total hip according to dual-energy X-ray absorptiometry (DXA) measurement. Cortical porosity increases with ageing and is believed to be important for bone strength. OBJECTIVE: To investigate whether older women with hip fracture have higher cortical porosity than controls, and if so whether this difference is independent of clinical risk factors and areal bone mineral density (aBMD)...
January 18, 2017: Journal of Internal Medicine
https://www.readbyqxmd.com/read/28096061/connexin37-deficiency-alters-organic-bone-matrix-cortical-bone-geometry-and-increases-wnt-%C3%AE-catenin-signaling
#4
Rafael Pacheco-Costa, Jay R Kadakia, Emily G Atkinson, Joseph M Wallace, Lilian I Plotkin, Rejane D Reginato
Deletion of connexin (Cx) 37 in mice leads to increased cancellous bone mass due to defective osteoclast differentiation. Paradoxically; however, Cx37-deficient mice exhibit reduced cortical thickness accompanied by higher bone strength, suggesting a contribution of Cx37 to bone matrix composition. Thus, we investigated whether global deletion of Cx37 alters the composition of organic bone extracellular matrix. Five-month-old Cx37(-/-) mice exhibited increased marrow cavity area, and periosteal and endocortical bone surface resulting in higher total area in tibia compared to Cx37(+/+) control mice...
January 13, 2017: Bone
https://www.readbyqxmd.com/read/28095515/effects-of-ultraviolet-photofunctionalization-on-bone-augmentation-and-integration-capabilities-of-titanium-mesh-and-implants
#5
Makoto Hirota, Takayuki Ikeda, Masako Tabuchi, Tomomichi Ozawa, Iwai Tohnai, Takahiro Ogawa
PURPOSE: Ultraviolet (UV)-mediated photofunctionalization has earned considerable attention for the enhancement of the biologic capabilities of titanium. The effects of photofunctionalization on bone augmentation and gap closure were examined using titanium implants and mesh in a rat femur model. MATERIALS AND METHODS: An acid-etched titanium implant (4-mm length, 1-mm diameter) was placed in the gluteal tuberosity that resembles a knife-edge-like edentulous ridge...
January 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28094241/gelatin-freeze-casting-of-biomimetic-titanium-alloy-with-anisotropic-and-gradient-pore-structure
#6
Lei Zhang, Ronan Le Coz-Botrel, Charlotte Beddoes, Terje Sjöström, Bo Su
Titanium is a material commonly used for dental and orthopaedic implants. However, due to large differences in properties between the titanium metal and the natural bone, stress shielding has been observed in the surrounding area, resulting in bone atrophy, and thus has raised concerns of the use of this material. Ideally implant materials should possess similar properties to the surrounding tissues in order to distribute the load as the joint would naturally, while also possessing a similar porous structure to the bone to enable interaction with the surrounding material...
January 17, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28092776/periosteum-tissue-engineering-in-an-orthotopic-in%C3%A2-vivo-platform
#7
J G Baldwin, F Wagner, L C Martine, B M Holzapfel, C Theodoropoulos, O Bas, F M Savi, C Werner, E M De-Juan-Pardo, D W Hutmacher
The periosteum plays a critical role in bone homeostasis and regeneration. It contains a vascular component that provides vital blood supply to the cortical bone and an osteogenic niche that acts as a source of bone-forming cells. Periosteal grafts have shown promise in the regeneration of critical size defects, however their limited availability restricts their widespread clinical application. Only a small number of tissue-engineered periosteum constructs (TEPCs) have been reported in the literature. A current challenge in the development of appropriate TEPCs is a lack of pre-clinical models in which they can reliably be evaluated...
November 20, 2016: Biomaterials
https://www.readbyqxmd.com/read/28091721/influence-of-tooth-dimension-on-the-initial-mobility-based-on-plaster-casts-and-x-ray-images-a-numerical-study
#8
Martin Hartmann, Cornelius Dirk, Susanne Reimann, Ludger Keilig, Anna Konermann, Andreas Jäger, Christoph Bourauel
AIMS: The goal was to determine the influence of different geometric parameters of the tooth on the initial tooth mobility and the position of the center of resistance employing numerical models based on scaled X-ray images and plaster casts. METHODS: The dimensions of tooth 21 were measured in 21 patients, using radiographs and dental casts. Length and mesiodistal width of the tooth were obtained from the X-ray image and the orovestibular diameter from the plaster cast...
January 13, 2017: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/28090655/30-second-bound-and-pore-water-concentration-mapping-of-cortical-bone-using-2d-ute-with-optimized-half-pulses
#9
Mary Kate Manhard, Kevin D Harkins, Daniel F Gochberg, Jeffry S Nyman, Mark D Does
PURPOSE: MRI of cortical bone has the potential to offer new information about fracture risk. Current methods are typically performed with 3D acquisitions, which suffer from long scan times and are generally limited to extremities. This work proposes using 2D UTE with half pulses for quantitatively mapping bound and pore water in cortical bone. METHODS: Half-pulse 2D UTE methods were implemented on a 3T Philips Achieva scanner using an optimized slice-select gradient waveform, with preparation pulses to selectively image bound or pore water...
January 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28090449/ultrashort-time-to-echo-magnetic-resonance-techniques-for-the-musculoskeletal-system
#10
REVIEW
Palanan Siriwanarangsun, Sheronda Statum, Reni Biswas, Won C Bae, Christine B Chung
Magnetic resonance (MR) imaging has been widely implemented as a non-invasive modality to investigate musculoskeletal (MSK) tissue disease, injury, and pathology. Advancements in MR sequences provide not only enhanced morphologic contrast for soft tissues, but also quantitative biochemical evaluation. Ultrashort time to echo (UTE) sequence, in particular, enables novel morphologic and quantitative evaluation of previously unseen MSK tissues. By using short minimum echo times (TE) below 1 msec, the UTE sequence can unveil short T2 properties of tissues including the deepest layers of the articular cartilage, cartilaginous endplate at the discovertebral junction, the meniscus, and the cortical bone...
December 2016: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28089388/cortical-bone-thickness-of-the-mandibular-canal-and-implications-for-bilateral-sagittal-split-osteotomy-a-cadaveric-study
#11
L Promma, N Sakulsak, P Putiwat, P Amarttayakong, S Iamsaard, H Trakulsuk, K Hirunyakorn, S Suarbua, Y Wattanaraeungchai
Preoperative delineation of the mandibular canal and surrounding cortical bone thickness is mandatory prior to bilateral sagittal split osteotomy (BSSO). The cortical bone thickness of 101 cadaveric mandibles was measured to define the mandibular canal. The mandibles were cut at the anterior ramus, at the third, second, and first molar, and at the premolar. The cortical bone thickness was measured between the mandibular canal and inferior border, buccal cortex, and lingual cortex at each cutting point. No difference was found between the right and left sides of the mandible, or between males and females, with one exception: males were found to have thicker inferior cortical bone at the premolar site than females...
January 12, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28088646/bone-microarchitecture-in-adolescent-boys-with-autism-spectrum-disorder
#12
Ann M Neumeyer, Natalia Cano Sokoloff, Erin McDonnell, Eric A Macklin, Christopher J McDougle, Madhusmita Misra
BACKGROUND: Boys with autism spectrum disorder (ASD) have lower areal bone mineral density (aBMD) than typically developing controls (TDC). Studies of volumetric BMD (vBMD) and bone microarchitecture provide information about fracture risk beyond that provided by aBMD but are currently lacking in ASD. OBJECTIVES: To assess ultradistal radius and distal tibia vBMD, bone microarchitecture and strength estimates in adolescent boys with ASD compared to TDC. DESIGN/METHODS: Cross-sectional study of 34 boys (16 ASD, 18 TDC) that assessed (i) aBMD at the whole body (WB), WB less head (WBLH), hip and spine using dual X-ray absorptiometry (DXA), (ii) vBMD and bone microarchitecture at the ultradistal radius and distal tibia using high-resolution peripheral quantitative CT (HRpQCT), and (iii) bone strength estimates (stiffness and failure load) using micro-finite element analysis (FEA)...
January 11, 2017: Bone
https://www.readbyqxmd.com/read/28081469/anti-osteoporotic-effects-of-an-antidepressant-tianeptine-on-ovariectomized-rats
#13
Osama A Alkhamees, Abdulaziz S Al-Roujayee, Hatem M Abuohashish, Mohammed M Ahmed
In the current investigation, the potential alleviating effects of tianeptine against bone loss induced in ovariectomized (OVX) rats was determined. Two weeks following a bilateral ovariectomy operation, tianeptine treatment (12.5 and 25mg/kg/twice/d) was initiated and continued for twenty-eight consecutive days. Changes in serum and urinary bone turnover biomarkers and osteoclastogenesis-inducing factors were estimated. The femoral bone mineral content was estimated using inductively-coupled-plasma mass spectrometry...
January 9, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28079706/ibuprofen-before-exercise-does-not-prevent-cortical-bone-adaptations-to-training
#14
Vanessa D Sherk, R Dana Carpenter, Erin D Giles, Janine A Higgins, Robera M Oljira, Ginger C Johnson, Samuel Mills, Paul S MacLean
: Using a nonsteroidal anti-inflammatory drug (NSAID) before a single bout of mechanical loading can reduce bone formation response. It is unknown whether this translates to an attenuation of bone strength and structural adaptations to exercise training. PURPOSE: To determine whether NSAID use before exercise prevents increases in bone structure and strength in response to weight-bearing exercise. METHODS: Adult female Wistar rats (n=43) were randomized to Ibuprofen (IBU) or Vehicle (VEH) and Exercise (EX) or Sedentary (SED) groups in a 2x2 (drug, activity) ANCOVA design with body weight as the covariate, and data are reported as mean±SE...
January 10, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28077890/effect-of-lead-nanoparticles-inhalation-on-bone-calcium-sensing-receptor-hydroxyapatite-crystal-and-receptor-activator-of-nuclear-factor-kappa-b-in-rats
#15
Rendra Leonas, Zairin Noor, Hermawan Nagar Rasyid, Tita Husnitawati Madjid, Fachry Ambia Tanjung
This study aimed to investigate whether Pb nanoparticle exposure affects the bone calcium sensing receptor (CaSR), hydroxyapatite crystal, and receptor activator of nuclear factor-kappa B (RANK) in rats exposed to subchronic and chronic inhalation. Thirty two rats were randomly divided into eight groups. One group is a non-exposed group. While three groups were exposed to nanoparticles Pb at the following doses 6.25; 12.5; or 25 mg/m(3) an hour daily for 28 days. Another three groups were exposed to nanoparticles Pb at following doses 6...
October 2016: Acta Informatica Medica: AIM
https://www.readbyqxmd.com/read/28077497/bone-material-strength-index-as-measured-by-impact-microindentation-is-altered-in-patients-with-acromegaly
#16
Frank Malgo, Neveen Hamdy, Ton J Rabelink, H Kroon, Kim M J A Claessen, Alberto M Pereira, N R Biermasz, Natasha M Appelman-Dijkstra
OBJECTIVE: Acromegaly is a rare disease caused by excess growth hormone (GH) production by a pituitary adenoma. The skeletal complications of GH and IGF-1 excess include increased bone turnover, increased cortical bone mass and deteriorated microarchitecture of trabecular bone, associated with a high risk of vertebral fractures in the presence of relatively normal Bone Mineral Density (BMD). We aimed to evaluate tissue-level properties of bone using impact microindentation (IMI) in well-controlled patients with acromegaly aged ≥18 years compared to 44 controls from the outpatient clinic of the Centre for Bone Quality...
January 11, 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/28077394/metal-backed-versus-all-polyethylene-unicompartmental-knee-arthroplasty-proximal-tibial-strain-in-an-experimentally-validated-finite-element-model
#17
C E H Scott, M J Eaton, R W Nutton, F A Wade, S L Evans, P Pankaj
OBJECTIVES: Up to 40% of unicompartmental knee arthroplasty (UKA) revisions are performed for unexplained pain which may be caused by elevated proximal tibial bone strain. This study investigates the effect of tibial component metal backing and polyethylene thickness on bone strain in a cemented fixed-bearing medial UKA using a finite element model (FEM) validated experimentally by digital image correlation (DIC) and acoustic emission (AE). MATERIALS AND METHODS: A total of ten composite tibias implanted with all-polyethylene (AP) and metal-backed (MB) tibial components were loaded to 2500 N...
January 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28077378/peripheral-skeleton-bone-strength-is-positively-correlated-with-total-and-dairy-protein-intakes-in-healthy-postmenopausal-women
#18
Claire Durosier-Izart, Emmanuel Biver, Fanny Merminod, Bert van Rietbergen, Thierry Chevalley, François R Herrmann, Serge L Ferrari, René Rizzoli
BACKGROUND: Bone mineral content (BMC) and bone mineral density (BMD) are positively correlated with dietary protein intakes, which account for 1-8% of BMC and BMD variances. However, the relation between bone strength and microstructure, which are variables that are not captured by areal bone mineral density (aBMD), and dietary protein intakes, particularly from specific dietary sources, has not been clearly established. OBJECTIVE: We investigated the association between the peripheral skeleton-predicted failure load and stiffness, bone microstructure, and dietary protein intakes from various origins (animal, divided into dairy and nondairy, and vegetable origins) in healthy postmenopausal women...
January 11, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28076363/effects-of-loading-duration-and-short-rest-insertion-on-cancellous-and-cortical-bone-adaptation-in-the-mouse-tibia
#19
Haisheng Yang, Rachel E Embry, Russell P Main
The skeleton's osteogenic response to mechanical loading can be affected by loading duration and rest insertion during a series of loading events. Prior animal loading studies have shown that the cortical bone response saturates quickly and short rest insertions between load cycles can enhance cortical bone formation. However, it remains unknown how loading duration and short rest insertion affect load-induced osteogenesis in the mouse tibial compressive loading model, and particularly in cancellous bone. To address this issue, we applied cyclic loading (-9 N peak load; 4 Hz) to the tibiae of three groups of 16 week-old female C57BL/6 mice for two weeks, with a different number of continuous load cycles applied daily to each group (36, 216 and 1200)...
2017: PloS One
https://www.readbyqxmd.com/read/28075029/does-cortical-bone-thickness-in-the-last-sacral-vertebra-differ-among-tail-types-in-primates
#20
Abigail C Nishimura, Gabrielle A Russo
OBJECTIVES: The external morphology of the sacrum is demonstrably informative regarding tail type (i.e., tail presence/absence, length, and prehensility) in living and extinct primates. However, little research has focused on the relationship between tail type and internal sacral morphology, a potentially important source of functional information when fossil sacra are incomplete. Here, we determine if cortical bone cross-sectional thickness of the last sacral vertebral body differs among tail types in extant primates and can be used to reconstruct tail types in extinct primates...
January 11, 2017: American Journal of Physical Anthropology
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