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https://www.readbyqxmd.com/read/29778488/the-2016-bernard-sachs-lecture-timing-in-morphogenesis-and-genetic-gradients-during-normal-development-and-in-malformations-of-the-nervous-system
#1
REVIEW
Harvey B Sarnat
Nervous system development is quadradimensional. Both normal ontogenesis and developmental malformations are explained in the context of the fourth dimension, timing. Timing of the onset of either the genetic expression of a mutation or an epigenetic event that may be teratogenic is primordial in determining morphogenesis and the forms of malformations with their functional consequences. Multiple genotypes may cause similar phenotypes or a single genotype with different degrees of retained normal genetic expression may result in variable phenotypes...
March 30, 2018: Pediatric Neurology
https://www.readbyqxmd.com/read/29776719/three-dimensional-changes-of-proximal-segments-in-facial-asymmetry-patients-after-bilateral-vertical-ramus-osteotomy
#2
J W Huh, S Y Kim, Y-B Lee, J H Park, H-D Jung, Y-S Jung
The intraoral vertical ramus osteotomy (IVRO) is a useful technique for mandibular setback surgery. However, there is a tendency for lateral flaring of the proximal segments on the non-deviation side after the correction of mandibular asymmetry with this technique. The purpose of this retrospective study was to evaluate the positional changes of the proximal segments after IVRO setback in skeletal class III patients with asymmetry, using preoperative and postoperative computed tomography scan data, and to apply the results in clinical practice...
May 15, 2018: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29763940/simultaneous-septal-perforation-repair-with-septorhinoplasty-a-31-year-experience
#3
Russell W H Kridel, Sean William Delaney
Septal perforation repair and septorhinoplasty (SRP) each present unique surgical challenges. However, in many instances, these procedures may be performed together successfully. In this study, the authors aim to determine the safety and effectiveness of combining primary or revision SRP and septal perforation repair via an open approach. A retrospective review was carried out of all consecutive patients who had SRP and septal perforation repair via an open approach between 1986 and 2017 in the senior author's practice...
May 15, 2018: Facial Plastic Surgery: FPS
https://www.readbyqxmd.com/read/29763501/influence-of-lateral-windows-with-decreased-vertical-height-following-maxillary-sinus-floor-augmentation-a-1-year-clinical-and-radiographic-study
#4
Wei Lu, Jin Xu, Hui-Ming Wang, Fu-Ming He
PURPOSE: To verify whether lateral sinus floor elevation (LSFE) with the vertical height of the osteotomy decreased to 3 to 5 mm can achieve improvement compared with a conventional lateral window in terms of implant survival, graft stability, and related complications. MATERIALS AND METHODS: Of the 49 patients who were selected for inclusion in this retrospective study, 25 patients were in the test group and 24 were in the control group based on the vertical height of the lateral window...
May 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29763497/additively-manufactured-titanium-and-cobalt-chromium-implant-frameworks-fit-and-effect-of-ceramic-veneering
#5
Per Svanborg, Alf Eliasson, Victoria Stenport
PURPOSE: The purpose of this study was to evaluate the fit of additively manufactured cobalt-chromium and titanium and CNC-milled titanium frameworks before and after ceramic veneering. MATERIALS AND METHODS: Ten stone casts simulating an edentulous maxilla provided with six abutment analogs were produced. For each stone cast, one additively manufactured cobalt-chromium framework (AM CoCr) and one titanium framework (AM Ti) were fabricated. The fit was analyzed with a coordinate measuring machine in three dimensions (x, y, and z axes) using best-fit virtual matching of center point coordinates, before and after ceramic veneering...
May 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29762113/cervicothoracic-pedicle-morphometry-using-an-osteological-collection-to-characterize-trends-in-pedicle-size
#6
Mhamad Faour, Charles C Yu, Navkirat Bajwa, Jason O Toy, Uri M Ahn, Nicholas U Ahn
Pedicle screws are a common treatment option for spinal instability. Despite their popularity, pedicle screws carry the risk of transpedicular violation with subsequent neural and vascular damage. This study measured the pedicle dimensions of 500 dry specimens in an osteological collection. The data provide the orthopedic spine surgeon with an accurate measure of pedicle morphometry in light of previously limited and contradictory results. The study demonstrates that pedicle height at the cervicothoracic junction tends to increase with body height, particularly for females...
2018: Journal of Surgical Orthopaedic Advances
https://www.readbyqxmd.com/read/29761707/evaluation-of-the-load-system-produced-by-a-single-intrusion-bend-in-a-maxillary-lateral-incisor-bracket-with-different-alloys
#7
Ricardo Lima Shintcovsk, Roberto Soares da Silva, Larry White, Lidia Parsekian Martins, Renato Parsekian Martins
OBJECTIVES: To evaluate if a 0.5-mm vertical bend applied on an incisor bracket produces movements in other planes and if different wires influence these effects. MATERIALS AND METHODS: An acrylic model of a treated patient with brackets passively bonded was attached to an Orthodontic Force Tester, and a load cell was attached to the left lateral incisor. Thirty 0.019 × 0.025-inch archwires were divided into three groups according to their alloy: SS (stainless steel), B-Ti (beta-titanium), and MF (beta-titanium wire coated with nickel-titanium)...
May 15, 2018: Angle Orthodontist
https://www.readbyqxmd.com/read/29758609/experiments-and-characterization-of-low-frequency-oscillations-in-a-granular-column
#8
Loreto Oyarte Gálvez, Nicolás Rivas, Devaraj van der Meer
The behavior of a vertically vibrated granular bed is reminiscent of a liquid in that it exhibits many phenomena such as convection and Faraday-like surface waves. However, when the lateral dimensions of the bed are confined such that a quasi-one-dimensional geometry is formed, the only phenomena that remain are bouncing bed and the granular Leidenfrost effect. This permits the observation of the granular Leidenfrost state for a wide range of energy injection parameters and more specifically allows for a thorough characterization of the low-frequency oscillation (LFO) that is present in this state...
April 2018: Physical Review. E
https://www.readbyqxmd.com/read/29750102/evaluation-of-accuracy-of-various-impression-techniques-and-impression-materials-in-recording-multiple-implants-placed-unilaterally-in-a-partially-edentulous-mandible-an-in-vitro-study
#9
G Parameshwari, B Chittaranjan, N Sudhir, C-K Anulekha-Avinash, M Taruna, M Ramureddy
Background: Various factors like implant angulation, type of impression material and tray type affects the implant impression accuracy. To date limited in-vitro studies were carried out on the implant impression accuracy of unilateral partially edentulous arches. The aim of this research was to evaluate the effects of 0o, 15o and 25o implant angulations on impression accuracy in simulated master casts of unilateral partially edentulous situation using different impression materials and tray selections...
April 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29743384/temporal-change-in-the-occlusal-vertical-dimension-and-its-involvement-in-modulation-of-jaw-movement-in-bite-reduced-animals
#10
Hiroshi Matoba, Hayato Kanayama, Takafumi Kato, Mohammad Z Hossain, Junichi Kitagawa, Yoshie Takehana, Kazuhiro Yamada, Yuji Masuda
The occlusal vertical dimension (OVD) in guinea pigs is maintained by tooth eruption and grinding. It has been reported that the experimentally raised OVD recovers to the innate OVD within a few days in guinea pigs. However, the mechanisms underlying OVD adjustment are not entirely understood. This study thus aimed to clarify whether the experimentally reduced OVD would recover. Bite-reduced guinea pigs were created by applying bilateral intermaxillary elastics for 10 days. Guinea pigs without elastics were used as a control...
May 10, 2018: Journal of Oral Science
https://www.readbyqxmd.com/read/29741585/shifts-in-key-time-points-and-strategies-for-a-multisegment-motor-task-in-healthy-aging-subjects
#11
Matthieu Casteran, Pauline M Hilt, France Mourey, Patrick Manckoundia, Robert French, Elizabeth Thomas
In this study, we compared key temporal points in the whole body pointing movement of healthy aging and young subjects. During this movement, subject leans forward from a standing position to reach a target. As it involves forward inclination of the trunk, the movement creates a risk for falling. We examined two strategic time points during the task-first, the crossover point where the velocity of the center of mass (CoM) in the vertical dimension outstripped the velocity in the anteroposterior dimension and secondly, the time to peak of the CoM velocity profile...
May 5, 2018: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/29740003/development-of-ordered-porous-sub-25-nm-dimensions-surface-membrane-structures-using-a-block-copolymer-approach
#12
Tandra Ghoshal, Justin D Holmes, Michael A Morris
In an effort to develop block copolymer lithography to create high aspect vertical pore arrangements in a substrate surface we have used a microphase separated poly(ethylene oxide) -b- polystyrene (PEO-b-PS) block copolymer (BCP) thin film where (and most unusually) PS not PEO is the cylinder forming phase and PEO is the majority block. Compared to previous work, we can amplify etch contrast by inclusion of hard mask material into the matrix block allowing the cylinder polymer to be removed and the exposed substrate subject to deep etching thereby generating uniform, arranged, sub-25 nm cylindrical nanopore arrays...
May 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29731941/an-anthropometric-study-of-cranio-facial-measurements-and-their-correlation-with-vertical-dimension-of-occlusion-among-saudi-arabian-subpopulations
#13
REVIEW
Muhammed Irfan Majeed, Satheesh B Haralur, Muhammed Farhan Khan, Maram Awdah Al Ahmari, Nourah Falah Al Shahrani, Sharaz Shaik
BACKGROUND: Determining and restoring physiological vertical dimension of occlusion (VDO) is the critical step during complete mouth rehabilitation. The improper VDO compromises the aesthetics, phonetics and functional efficiency of the prosthesis. Various methods are suggested to determine the accurate VDO, including the facial measurements in the clinical situations with no pre-extraction records. The generalisation of correlation between the facial measurements to VDO is criticised due to gender dimorphism and racial differences...
April 15, 2018: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/29729008/analysis-of-the-far-medial-transoral-endoscopic-approach-to-the-infratemporal-fossa
#14
Hafiz S Patwa, Juan C Yanez-Siller, Matias Gomez Galarce, Bradley A Otto, Daniel M Prevedello, Ricardo L Carrau
OBJECTIVES/HYPOTHESIS: To demonstrate anatomic relationships of the far-medial transoral endoscopic assisted approach (FMT-EAA) to the infratemporal fossa (ITF) and define the corridor dimensions, surgical freedom, and limitations associated with this approach. STUDY DESIGN: Cadaveric study. METHODS: Twenty ITFs (10 specimens) were dissected with the assistance of 0 °, 30 °, and 45 ° rod-lens endoscopes. Image guidance was used to confirm and measure the corridors' structural boundaries and document the anatomical relationships encountered in this approach...
May 4, 2018: Laryngoscope
https://www.readbyqxmd.com/read/29728955/relationships-among-retropalatal-airway-pharyngeal-length-and-craniofacial-structures-determined-by-magnetic-resonance-imaging-in-patients-with-obstructive-sleep-apnea
#15
Suat Avci, Hatice Lakadamyali, Huseyin Lakadamyali, Erdinc Aydin, Mustafa Agah Tekindal
BACKGROUND: The integration of anatomical and nonanatomical parameters will improve our ability to predict the outcomes of OSA treatment. Currently, no standardized, quantitative classification of upper airway anatomical traits is available. The retropalatal (RP) airway is the most important area to consider when planning anatomical treatment. However, current evaluation methods feature qualitative conventional endoscopy. Here, we describe a quantitative magnetic resonance imaging (MRI) method used to classify RP airway patterns...
May 5, 2018: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/29728555/prosthetic-rehabilitation-using-a-telescopic-crown-constructed-with-computer-assisted-design-and-computer-assisted-manufacturing-a-case-report-with-a-2-year-follow-up
#16
Nasser M Al Ahmari
Aim and background: This case report describes a 74-year-old female patient whose teeth were rehabilitated using telescopic crowns (TCs) on abutments and fixed dental prostheses (FDPs) in the maxillary arch with the aid of computer-assisted design and computer-assisted manufacturing (CAD/CAM) technology. The mandibular arch was restored using casted removable dental prostheses (RDPs) and surveyed crowns. Case report: The treatment sequences were followed as recommended in the dental literature. First, existing defective restorations were eliminated, caries was removed, and excellent mouth preparation was performed...
April 1, 2018: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29725852/three-dimensional-evaluation-of-the-posterior-airway-space-differences-in-computed-tomography-and-cone-beam-computed-tomography
#17
Nassim Ayoub, Philipp Eble, Kristian Kniha, Florian Peters, Stephan Christian Möhlhenrich, Evgeny Goloborodko, Frank Hölzle, Ali Modabber
OBJECTIVES: Obstructive sleep apnea syndrome (OSAS) becomes increasingly important. For diagnosis and surgery, computed tomography (CT), and cone beam computed tomography (CB-CT) are used equally, although in most of cases, patient positioning differs between supine positioning (CT) and upright seating positioning (CB-CT). We measured volumetric and anatomical changes in the posterior airway space (PAS) between upright and supine positioning in a three-dimensional set up. MATERIALS AND METHODS: Coherent CT and CB-CT scans of 55 patients were included in the study...
May 3, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29718087/physical-properties-of-silicone-gel-breast-implants
#18
Mark L Jewell, Bradley P Bengtson, Kate Smither, Gina Nuti, TracyAnn Perry
Background: Surgical applications using breast implants are individualized operations to fill and shape the breast. Physical properties beyond shape, size, and surface texture are important considerations during implant selection. Objective: Compare form stability, gel material properties, and shell thickness of textured shaped, textured round, and smooth round breast implants from 4 manufacturers: Allergan, Mentor, Sientra, and Establishment Labs through bench testing...
April 28, 2018: Aesthetic Surgery Journal
https://www.readbyqxmd.com/read/29715228/cervical-facet-orientation-varies-with-age-in-children-an-mri-study
#19
Sebastien Pesenti, Renaud Lafage, Virginie Lafage, Michel Panuel, Benjamin Blondel, Jean-Luc Jouve
BACKGROUND: Within the spine, mobility and stability are principles that drive anatomic morphology. Based on radiographic measurements, the orientation of cervical facet joints has been proven to change throughout child growth. However, because of the mainly cartilaginous composition of the vertebrae in the young child, the lack of osseous landmarks makes radiograph-based measurements unreliable. The aims of our study were to evaluate the change in the sagittal orientation of the cervical facet joints with age based on magnetic resonance imaging (MRI) of asymptomatic children and to compare it to the changes in vertebral body dimensions...
May 2, 2018: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/29714791/focusing-short-wavelength-surface-plasmons-by-a-plasmonic-mirror
#20
Erdem Ogut, Cenk Yanik, Ismet Inonu Kaya, Cleva Ow-Yang, Kursat Sendur
Emerging applications in nanotechnology, such as superresolution imaging, ultra-sensitive biomedical detection, and heat-assisted magnetic recording, require plasmonic devices that can generate intense optical spots beyond the diffraction limit. One of the important drawbacks of surface plasmon focusing structures is their complex design, which is significant for ease of integration with other nanostructures and fabrication at low cost. In this study, a planar plasmonic mirror without any nanoscale features is investigated that can focus surface plasmons to produce intense optical spots having lateral and vertical dimensions of λ/9...
May 1, 2018: Optics Letters
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