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https://www.readbyqxmd.com/read/28650795/quantitation-of-mandibular-symphysis-bone-as-source-of-bone-grafting-description-in-class-i-and-class-iii-skeletal-conditions
#1
Humberto Velásquez, Sergio Olate, César Díaz, Pablo Navarro, Eduardo Borie, Márcio de Moraes
The aim of this study was to quantify the cortical and cancellous bone in the mandibular symphysis and relate it to the teeth and to the skeletal class. A descriptive study was conducted using cone beam computerized tomography (CBCT). Class I and class III subjects were included, defined according to dental occlusion and cephalogram results. Linear measurements were taken on the CBCT of the mandibular canines, lateral incisors, and central incisors, where the analysis was related to the axial and apical axes considering the bone in relation to the dental area...
June 2017: Journal of Oral Implantology
https://www.readbyqxmd.com/read/28645848/fe-and-experimental-study-on-how-the-cortex-material-properties-of-synthetic-femurs-affect-strain-levels
#2
Vitor M M Lopes, Maria A Neto, Ana M Amaro, Luis M Roseiro, M F Paulino
The primary aim of this work was to validate the "numerical" cortex material properties (transversely isotropic) of synthetic femurs and to evaluate how the strain level of the cancellous bone can be affected by the FE modeling of the material's behavior. Sensitivity analysis was performed to find out if the parameters of the cortex material affect global strain results more than the Polyurethane (PU) foam used to simulate cancellous bone. Standard 4th generation composite femurs were made with 0.32g/cm(3) solid PU foam to model healthy cancellous bone, while 0...
June 20, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28643223/the-effect-of-membrane-exposure-on-lateral-ridge-augmentation-a-case-controlled-study
#3
Mehmet A Eskan, Marie-Eve Girouard, Dean Morton, Henry Greenwell
BACKGROUND: The effect of membrane exposure on guided bone regeneration (GBR) for lateral ridge augmentation has been poorly addressed. This case-controlled study aimed to investigate potential effect of membrane exposure lateral ridge augmentation and subsequent implant placement. METHODS: A total of 14 patients that did receive lateral ridge augmentation procedure using allogeneic cancellous graft particulate in combination with an alloplastic bioresorbable matrix barrier were retrospectively selected for this study...
December 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28641952/the-effect-of-tissue-segmented-attenuation-maps-on-pet-quantification-with-a-special-focus-on-large-arteries
#4
A Mota-Cobian, J C Alonso-Farto, L Fernández-Friera, J Sánchez-González, B López-Melgar, L J Jiménez-Borreguero, V Fuster, J Ruiz-Cabello, S España
OBJECTIVES: Accuracy on quantitative PET image analysis relies on the correct application of attenuation correction which is one of the major challenges for PET/MRI that remains to be solved. The purpose of this study is to evaluate the effect of MRI-based attenuation maps and the use of flexible coils on the quantitative accuracy of PET images with a special focus on large arteries. MATERIALS AND METHODS: PET/CT data from eight oncologic patients was used. PET data was reconstructed using attenuation maps with different level of detail emulating several approaches available on current PET/MRI scanners...
June 19, 2017: Revista Española de Medicina Nuclear e Imagen Molecular
https://www.readbyqxmd.com/read/28641194/use-of-a-long-distally-fixed-intramedullary-stem-to-treat-a-periprosthetic-femoral-fracture-following-total-hip-arthroplasty-using-a-thrust-plate-hip-prosthesis-a-case-report
#5
Hiroyuki Hatanaka, Goro Motomura, Satoshi Ikemura, Kazuhiko Sonoda, Yusuke Kubo, Takeshi Utsunomiya, Takuaki Yamamoto, Yasuharu Nakashima
INTRODUCTION: The thrust plate hip prosthesis (TPP; Zimmer, Winterthur, Switzerland) is a hip prosthesis that is no longer in production. Few reports have focused on periprosthetic fractures following total hip arthroplasty (THA) with the use of a TPP. PRESENTATION OF CASE: We report a 57-year-old woman with a periprosthetic femoral fracture 13 years after THA with the use of a TPP. A plain radiograph showed a displaced subtrochanteric fracture of the right femur just below the distal tip of the lateral plate without implant loosening...
June 13, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28638889/reduction-of-intra-articular-adhesion-by-topical-application-of-daidzein-following-knee-surgery-in-rabbits
#6
Xiangchun Liu, Heng Jia, Hongsheng Xia
BACKGROUND: Intra-articular adhesion is the commonest complication that is faced by orthopedic surgeons after knee surgery. Thus, the present investigation evaluates the effect of daidzein on intra-articular adhesion in rabbits. MATERIAL AND METHODS: All the rabbits were separated in to four different groups each group carries ten rabbits. Cancellous bone was exposed in each rabbit by removing cortical bone from both side of the femoral condyle. Following daidzein (2...
2017: African Journal of Traditional, Complementary, and Alternative Medicines: AJTCAM
https://www.readbyqxmd.com/read/28637394/comparison-of-bone-healing-as-assessed-by-computed-tomography-following-tibial-tuberosity-advancement-in-dogs-with-and-without-autogenous-cancellous-bone-grafts
#7
D R James, N Webster, J D White, A M Marchevsky, R G Cashmore, M Havlicek, S Fearnside, A P Black
AIMS: To objectively compare measures of bone healing, using computed tomography (CT) in dogs following bilateral tibial tuberosity advancement (TTA), between tibiae treated with and without autogenous cancellous bone grafts. METHODS: Ten dogs with bilateral cranial cruciate ligament disease requiring surgical stabilisation were prospectively recruited to undergo single-session bilateral TTA, with only one, randomly assigned, tibia receiving bone graft in the osteotomy deficit...
June 21, 2017: New Zealand Veterinary Journal
https://www.readbyqxmd.com/read/28636926/enhanced-human-bone-marrow-mesenchymal-stromal-cell-adhesion-on-scaffolds-promotes-cell-survival-and-bone-formation
#8
Miryam Mebarki, Laura Coquelin, Pierre Layrolle, Séverine Battaglia, Marine Tossou, Philippe Hernigou, Hélène Rouard, Nathalie Chevallier
In order to induce an efficient bone formation with human bone marrow mesenchymal stromal cells (hBMSC) associated to a scaffold, it is crucial to determine the key points of the hBMSC action after in vivo transplantation as well as the appropriate features of a scaffold. To this aim we compared the hBMSC behavior when grafted onto two biomaterials allowing different bone potential in vivo. The cancellous devitalized Tutoplast®-processed bone (TPB) and the synthetic hydroxyapatite/β-tricalcium-phosphate (HA/βTCP) which give at 6 weeks 100% and 50% of bone formation respectively...
June 18, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28630862/influence-of-deformation-and-stress-between-bone-and-implant-from-various-bite-forces-by-numerical-simulation-analysis
#9
Hsin-Chung Cheng, Boe-Yu Peng, May-Show Chen, Chiung-Fang Huang, Yi Lin, Yung-Kang Shen
Endosseous oral implant is applied for orthodontic anchorage in subjects with multiple tooth agenesis. Its effectiveness under orthodontic loading has been demonstrated clinically and experimentally. This study investigates the deformation and stress on the bone and implant for different bite forces by three-dimensional (3D) finite element (FE) methods. A numerical simulation of deformation and stress distributions around implants was used to estimate the survival life for implants. The model was applied to determine the pattern and distribution of deformations and stresses within the endosseous implant and on supporting tissues when the endosseous implant is used for orthodontic anchorage...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28621284/comparison-of-platform-switched-and-sloping-shoulder-implants-on-stress-reduction-in-various-bone-densities-finite-element-analysis
#10
Joji Markose, S Suresh, Shruthi Eshwar, K Rekha, Vipin Jain, Supriya Manvi
INTRODUCTION: Comparison of platform switched (PS), sloping shoulder, and regular implants on stress reduction in various bone densities with finite element analysis. MATERIALS AND METHODS: A total of 12 three-dimensional finite element models were built to analyze the stress distribution model. Nobel Biocare 4.3 × 8 mm regular platform replace select implant with matching diameter easy abutment, Nobel Biocare 4.3 × 8 mm replace select implant PS with 3.5 mm diameter easy abutment, Bicon 4 × 8 mm implant with 4 mm diameter sloping shoulder abutments were created virtually in compact bone density using software...
June 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28618433/crestal-sinus-augmentation-with-recombinant-human-bone-morphogenetic-protein-2-clinical-and-radiographic-outcomes-of-2-year-pilot-trial
#11
Ulrike Kuchler, Claudia M Rudelstorfer, Barbara Barth, Gabor Tepper, Dominika Lidinsky, Patrick Heimel, Georg Watzek, Reinhard Gruber
PURPOSE: Recombinant human bone morphogenetic protein 2 (rhBMP-2) together with an absorbable collagen carrier (ACS) was approved for augmentation of the maxillary sinus prior to implant placement. The original registration trial was based on a lateral window approach. Clinical outcomes of crestal sinus augmentation with rhBMP-2 have not been reported so far. MATERIALS AND METHODS: An uncontrolled pilot trial in which seven patients with a residual maxillary height below 5 mm were enrolled to receive crestal sinus augmentation with rhBMP-2/ACS was conducted...
June 14, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28617181/a-novel-surgical-approach-for-treating-distal-radial-extraarticular-malunion-oblique-osteotomy-with-buttress-plate-stabilization
#12
Chi-Chuan Wu
PURPOSE: Distal radial extraarticular malunions are not uncommon. However, requirements of surgical correction depend on multiple conditions. Traditionally, surgical techniques include closing or opening wedge osteotomies. Each has unique advantages and disadvantages. An oblique osteotomy was developed to simplify the revision surgery. METHODS: Forty-eight consecutive adult patients with 48 malunions were surgically treated. An oblique osteotomy of 45° vertical to the radial longitudinal axis was performed from medio-distally to latero-proximally...
May 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28614236/utilization-of-ring-shaped-bone-allograft-for-surgical-treatment-of-adolescent-post-tubercular-kyphosis-a-retrospective-study
#13
Xiang Yin, Peng Liu, Yao-Yao Liu, Wei-Li Fan, Bai-Yi Liu, Jian-Hua Zhao
This study aimed to investigate the mid-term outcome of ring-shaped bone allografts in the surgical treatment of adolescent post-tubercular kyphosis secondary to spinal tuberculosis.The records of adolescent patients diagnosed with spinal tuberculosis who received treatment in our department between 2009 and 2013 were retrospectively reviewed. The anterior approach was used in cases of cervical kyphosis and the posterior approach was used in cases of thoracic and lumbar kyphosis. During the surgery, the ring-shaped bone was used as a structural bone graft associated with the cancellous bone filing in the center portion of the ring shape...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28607813/differential-involvement-of-wnt-signaling-in-bmp-regulation-of-cancellous-versus-periosteal-bone-growth
#14
Guangxu He, Yu Shi, Joohyun Lim, Teresita Bellido, Jiangdong Ni, Fanxin Long
Bone morphogenetic proteins (Bmp) are well-known to induce bone formation following chondrogenesis, but the direct role of Bmp signaling in the osteoblast lineage is not completely understood. We have recently shown that deletion of the receptor Bmpr1a in the osteoblast lineage with Dmp1-Cre reduces osteoblast activity in general but stimulates proliferation of preosteoblasts specifically in the cancellous bone region, resulting in diminished periosteal bone growth juxtaposed with excessive cancellous bone formation...
2017: Bone Research
https://www.readbyqxmd.com/read/28606789/plate-fixation-with-autogenous-calcaneal-dowel-grafting-proximal-fourth-and-fifth-metatarsal-fractures-technique-and-case-series
#15
Chad L Seidenstricker, Edward G Blahous, Richard T Bouché, Amol Saxena
Metaphyseal and proximal diaphyseal fractures of the lateral column metatarsals can have problems with healing. In particular, those involving the fifth metatarsal have been associated with a high nonunion rate with nonoperative treatment. Although intramedullary screw fixation results in a high union rate, delayed healing and complications can occur. We describe an innovative technique to treat both acute and chronic injuries involving the metatarsal base from the metaphysis to the proximal diaphyseal bone of the fourth and fifth metatarsals...
June 9, 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28606577/effect-of-footprint-preparation-on-tendon-to-bone-healing-a-histologic-and-biomechanical-study-in-a-rat-rotator-cuff-repair-model
#16
Haruhiko Nakagawa, Toru Morihara, Hiroyoshi Fujiwara, Yukichi Kabuto, Tsuyoshi Sukenari, Yoshikazu Kida, Ryuhei Furukawa, Yuji Arai, Ken-Ichi Matsuda, Mitsuhiro Kawata, Masaki Tanaka, Toshikazu Kubo
PURPOSE: To compare the histologic and biomechanical effects of 3 different footprint preparations for repair of tendon-to-bone insertions and to assess the behavior of bone marrow-derived cells in each method of insertion repair. METHODS: We randomized 81 male Sprague-Dawley rats and green fluorescent protein-bone marrow chimeric rats into 3 groups. In group A, we performed rotator cuff repair after separating the supraspinatus tendon from the greater tuberosity and removing the residual tendon tissue...
June 9, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28606128/outcomes-of-cement-beads-and-cement-spacers-in-the-treatment-of-bone-defects-associated-with-post-traumatic-osteomyelitis
#17
Xu-Sheng Qiu, Yi-Xin Chen, Xiao-Yang Qi, Hong-Fei Shi, Jun-Fei Wang, Jin Xiong
BACKGROUND: Cement spacers (Masquelet technique) have traditionally been used for the treatment of segmental bone defects. However, no reports have used cement spacers for the treatment of small/partial segmental bone defects associated with osteomyelitis and compared the outcomes with cement beads. METHODS: We retrospectively analysed 40 patients with post-traumatic osteomyelitis of the tibia who underwent treatment, which was performed in two stages. In the first stage, thorough debridement was performed, and bone defects were filled with either antibiotic-impregnated cement beads (bead group, 18 patients) or spacers (spacer group, 22 patients)...
June 12, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28600846/ectopic-implantation-of-juvenile-osteochondral-tissues-recapitulates-endochondral-ossification
#18
Johnathan Ng, Yiyong Wei, Bin Zhou, Sarindr Bhumiratana, Aonnicha Burapachaisri, Edward Guo, Gordana Vunjak-Novakovic
Subcutaneous implantation in a mouse can be used to investigate tissue maturation in vivo. Here, we demonstrate that this simple model can recapitulate endochondral ossification associated with native skeletal development. By histological and μCT analysis, we investigated morphological changes of immature bovine osteochondral tissues over the course of subcutaneous implantation in immunocompromised mice for up to 10 weeks. We observed multiple similarities between the ectopic process and native endochondral ossification: (i) permanent cartilage retention in the upper zones, (ii) progressive loss of transient cartilage accompanied by bone formation at the interface, and (iii) remodeling of nascent endochondral bone into mature cancellous bone...
June 10, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28599562/measurements-of-inter-cochlear-level-and-phase-differences-of-bone-conducted-sound
#19
Robert W J Mcleod, John F Culling
Bone-anchored hearing aids are a widely used method of treating conductive hearing loss, but the benefit of bilateral implantation is limited due to interaural cross-talk. The present study measured the phase and level of pure tones reaching each cochlea from a single, mastoid placed bone transducer on normal hearing participants. In principle, the technique could be used to implement a cross-talk cancellation system in those with bilateral bone conductors. The phase and level of probe tones over two insert earphones was adjusted until they canceled sound from a bone transducer (i...
May 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28592818/characteristics-of-chinese-costal-cartilage-and-costa-calcification-using-dual-energy-computed-tomography-imaging
#20
Shanyong Zhang, Jinze Zhen, Huiping Li, Shoufu Sun, Huawei Wu, Pei Shen, Zengai Chen, Chi Yang
To assess characteristics of Chinese costal cartilage and costa calcification using Dual-Energy computed tomography(DECT). 154 patients who underwent chest DECT scanning were included in our study. They were divided into following groups: less than 30 years old, 31-40 years old, 41-50 years old, 51-60 years old and over 60 years old. The sixth, seventh and eighth costal cartilages and costas were evaluated. Calcification patterns of cartilage were classified as central(C), peripheral(P), mixed(M) and no calcification(N) types...
June 7, 2017: Scientific Reports
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